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titleXBeach parameter exclude list
linenumberstrue
D50                            # D50 grain size per grain type
D90                            # D90 grain size per grain type
Hrms                           # Hrms wave height for instat = 0,1,2,3
Tlong                          # Wave group period for case instat = 1
Tm01switch                     # Turn off or on Tm01 or Tm-10 switch
Topt                           # Absolute period to optimize coefficient
Trep                           # Representative wave period for instat = 0,1,2,3
alfa                           # Angle of x-axis from East
aquiferbot                     # Level of uniform aquifer bottom
aquiferbotfile                 # Name of the aquifer bottom file
avalanching                    # Include avalanching (1) or exclude (0)
back                           # Switch for boundary at bay side, 0 = radiating boundary (Ad), 1 = reflective boundary; uu=0
bcfile                         # Name of spectrum file
bchwiz                         # Use beachwizard, 0 = beachwizard off, 1 beachwizard on, bed update off, 2 beachwiz on, bed update on. (also requires morphology == 1)
bedfricfile                    # Bed friction file (only valid with values of C)
bedfriction                    # Bed friction formulation: 'chezy','white-colebrook'
compi                          # Imaginary unit
depfile                        # Name of the input bathymetry file
dir0                           # Mean wave direction (Nautical convention) for instat = 0,1,2,3
disch_loc_file                 # Name of discharge locations file
disch_timeseries_file          # Name of discharge timeseries file
drifterfile                    # Name of drifter data file
dt                             # Computational time step, in hydrodynamic time
dthetaS_XB                     # The (counter-clockwise) angle in the degrees needed to rotate from the x-axis in SWAN to the x-axis pointing East
dx                             # Regular grid spacing in x-direction
dy                             # Regular grid spacing in y-direction
dzg1                           # Thickness of top sediment class layers
dzg2                           # Nominal thickness of variable sediment class layer
dzg3                           # Thickness of bottom sediment class layers
flow                           # Include flow calculation (1), or exclude (0)
freewave                       # Switch for free wave propagation 0 = use cg (default); 1 = use sqrt(gh) in instat = 3
front                          # Switch for seaward flow boundary: 0 = radiating boundary(Ad), 1 = Van Dongeren, 1997
g                              # Gravitational acceleration
globalvars                     # Mnems of global output variables, not per se the same sice as nglobalvar (invalid variables, defaults)
gridform                       # Swicth to read in grid bathy files with 'XBeach' or 'Delft3D' format respectively
gw0                            # Level initial groundwater level
gw0file                        # Name of initial groundwater level file
gwReturb                       # Reynolds number for start of turbulent flow in case of gwscheme = turbulent
gwfastsolve                    # Reduce full 2D non-hydrostatic solution to quasi-explicit in longshore direction
gwflow                         # Turn on (1) or off (0) groundwater flow module
gwheadmodel                    # Model to use for vertical groundwater head: 'parabolic' (default), or 'exponential'
gwhorinfil                     # switch to include horizontal infiltration from surface water to groundwater (default = 0)
gwnonh                         # Switch to turn on or off non-hydrostatic pressure for groundwater
gwscheme                       # Scheme for momentum equation (laminar, turbulent)
hotstartflow                   # Switch to hotstart flow conditions with pressure gradient balanced by wind and bed stress
instat                         # Wave boundary condtion type
kmax                           # Number of sigma layers in Quasi-3D model; kmax = 1 (default) is without vertical structure of flow and suspensions
kx                             # Darcy-flow permeability coefficient in x-direction [m/s]
ky                             # Darcy-flow permeability coefficient in y-direction [m/s]
kz                             # Darcy-flow permeability coefficient in z-direction [m/s]
lat                            # Latitude at model location  for computing Coriolis
left                           # Switch for lateral boundary at ny+1, 'neumann' = vv computed from NSWE, 'wall' = reflective wall; vv=0
leftwave                       # old name for lateralwave
lwave                          # Include short wave forcing on NLSW equations and boundary conditions (1), or exclude (0)
maxiter                        # Maximum number of iterations in wave stationary
meanvars                       # Mnems of mean output variables (by variables)
mmpi                           # Number of domains in m direction (cross-shore) when manually specifying mpi domains
morfac                         # Morphological acceleration factor
morfacopt                      # Option indicating whether times should be adjusted (1) or not(0) for morfac
morphology                     # Include morphology (1) or exclude (0)
morstart                       # Start time morphology, in morphological time
morstop                        # Stop time morphology, in morphological time
mpiboundary                    # Fix mpi boundaries along y-lines ('y'), x-lines ('x'), use manual defined domains ('man') or find shortest boundary ('auto')
ncfilename                     # xbeach netcdf output file name
ncross                         # Number of output cross sections
nd                             # Number of computational layers in the bed
nd_var                         # Index of layer with variable thickness
ndischarge                     # Number of discharge locations
ndrifter                       # Number of drifers
ne_layer                       # Name of file containing depth of hard structure
ngd                            # Number of sediment classes
nglobalvar                     # Number of global output variables (as specified by user)
nhbreaker                      # Turn on or off nonhydrostatic breaker model
nmeanvar                       # Number of mean,min,max,var output variables
nmpi                           # Number of domains in n direction (alongshore) when manually specifying mpi domains
nonh                           # Non-hydrostatic pressure option: 0 = NSWE, 1 = NSW + non-hydrostatic pressure compensation Stelling & Zijlema, 2003
nonhspectrum                   # Switch between spectrum format for wave action balance of nonhydrostatic waves
npoints                        # Number of output point locations
npointvar                      # Number of point output variables
nrugauge                       # Number of output runup gauge locations
nship                          # Number of ships
nspectrumloc                   # Number of input spectrum locations
nspr                           # nspr = 1 long wave direction forced into centres of short wave bins, nspr = 0 regular long wave spreadin
ntdischarge                    # Length of discharge time series
nveg                           # Number of vegetation species
nx                             # Number of computiation cell corners in x-direction
ny                             # Number of computiation cell corners in y-direction
oldhu                          # Turn on / off old hu calculation
oldnyq                         # Turn off or on old nyquist switch
outputformat                   # Choice of output file format: 'netcdf', 'fortran', or 'debug'
paulrevere                     # Specifies tide on sea and land ('land') or two sea points ('sea') if tideloc = 2
pointtypes                     # Point types (0 = point, 1=rugauge)
pointvars                      # Mnems of point output variables (by variables)
posdwn                         # Bathymetry is specified positive down (1) or positive up (-1)
projection                     # projection string
px                             # Pi
q3d                            # Turn on (1) or off (0) quasi-3D sediment transport module
random                         # Random seed on (1) or off (0) for instat = 4,5,6 boundary conditions
rho                            # Density of water
rhoa                           # Air density
rhog8                          # 1/8*rho*g
rhos                           # Solid sediment density (no pores)
right                          # Switch for lateral boundary at right, 0 = vv computed from NSWE, 1 = reflective wall; vv=0
rightwave                      # old name for lateralwave
rotate                         # Rotate (1) postprocess output with the rotate function.
rt                             # Duration of wave spectrum at offshore boundary, in morphological time
sedtrans                       # Include sediment transport (1) or exclude (0)
shipfile                       # Name of ship data file
ships                          # Turn on (1) or off (0) ship waves
solver                         # Solver used to solve the linear system, sip, or tridiag (only for 1d)
solver_maxit                   # Maximum number of iterations in the linear sip solver
struct                         # Switch for hard structures
swave                          # Include short waves (1), exclude short waves (0)
swrunup                        # Turn on (1) or off (0) short wave runup
t                              # Computational time, in hydrodynamic time
taper                          # Spin-up time of wave boundary conditions, in morphological time
thetamax                       # Higher directional limit (angle w.r.t computational x-axis)
thetamin                       # Lower directional limit (angle w.r.t computational x-axis)
thetanaut                      # Thetamin,thetamax in cartesian (0) or nautical convention (1)
thetanum                       # Coefficient determining whether upwind (1) or central scheme (0.5) is used.
tideloc                        # Number of corner points on which a tide time series is specified
tidetype                       # Switch for offfshore boundary, velocity boundary or instant water level boundary (default)
timings                        # Switch to turn on (1) or off (0) progress output to screen
tintc                          # Interval time of cross section output
tintg                          # Interval time of global output
tintm                          # Interval time of mean,var,max,min output
tintp                          # Interval time of point and runup gauge output
tnext                          # Next time point for output or wave stationary calculation, in hydrodynamic time
tscross                        # Name of file containing timings of cross section output
tsglobal                       # Name of file containing timings of global output
tsmean                         # Name of file containing timings of mean, max, min and var output
tspoints                       # Name of file containing timings of point output
tstart                         # Start time of output, in morphological time
tstop                          # Stop time of simulation, in morphological time
tunits                         # Units can be defined in udunits format (seconds since 1970-01-01 00:00:00.00 +1:00)
vardx                          # Switch for variable grid spacing: 1 = irregular spacing, 0 = regular grid spacing
vegetation                     # Turn on (1) or off (0) interaction of waves and flow with vegetation
vegiefile                      # Name of vegie species list file
vegiemapfile                   # Name of vegie species map file
wbcversion                     # Version of wave boundary conditions
wearth                         # Angular velocity of earth calculated as: 1/rotation_time (in hours), later changed in calculation code to rad/s
windfile                       # Name of file with non-stationary wind data
windth                         # Nautical wind direction, in case of stationary wind
windv                          # Wind velocity, in case of stationary wind
xfile                          # Name of the file containing x-coordinates of the calculation grid
xori                           # X-coordinate of origin of axis
xyfile                         # Name of the file containing (Delft3D) xy-coordinates of the calculation grid
yfile                          # Name of the file containing y-coordinates of the calculation grid
yori                           # Y-coordinate of origin of axis
zs0                            # Inital water level
zs0file                        # Name of tide boundary condition series
zsinitfile                     # Name of inital condition file zs

Also added the following parameters to ignore list, because of zero-influence:
nrugdepth                      # of depths to compute runup in runup gauge
breakviscfac                   # Factor to increase viscosity during breaking
maxerror                       # Maximum wave height error in wave stationary iteration
facrun                         # calibration coefficient for short wave runup
maxbrsteep                     # Maximum wave steepness criterium
Tm01                           # Old name for Trep
split                          # Split threshold for variable sediment layer (ratio to nominal thickness)
wavint                         # Interval between wave module calls (only in stationary wave mode)
depthscale                     # depthscale of (lab)test simulated. 1 = default, which corresponds to teh real world (nature)
breakvisclen                   # Ratio between local depth and length scale in extra breaking viscosity
dtheta                         # Directional resolution
nsetbathy                      # Number of prescribed bed updates
frac_dz                        # Relative thickness to split time step for bed updating
setbathy                       # Provide timeseries of prescribed bathy input, 0 = off (default), 1 = on
oldwbc                         # (1) Use old version wave boundary conditions for instat 4,5,6
m                              # Power in cos^m directional distribution for instat = 0,1,2,3
Cd                             # Wind drag coefficient
merge                          # Merge threshold for variable sediment layer (ratio to nominal thickness)
ARC                            # Switch for active reflection compensation at seaward boundary: 0 = reflective, 1 = weakly (non) reflective
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ARCfacua                            # SwitchCalibration forfactor activetime reflectionaveraged compensationflows atdue seawardto boundary:wave 0skewness and asymmetry
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= reflective, 1 = weakly (non) reflective
BRfac                          # Calibration factor surface slope
C                              # Chezy coefficient
CFL                            # Maximum Courant-Friedrichs-Lewy number
CdTbfac                          # Calibration  # Wind drag coefficient
Tbfacfactor for bore interval Tbore: Tbore = Tbfac*Tbore
Tsmin                          # CalibrationMinimum factoradaptation for bore interval Tbore: Tbore = Tbfac*Tbore
Tsmin                          # Minimum adaptation time time scale in advection diffusion equation sediment
alpha                          # Wave dissipation coefficient in Roelvink formulation
bed                            # Calibration factor for bed transports [0..1]
beta                           # Breaker slope coefficient in roller model
betad                          # Dissipation parameter long wave breaking turbulence
break                          # Type of breaker formulation (1=roelvink, 2=baldock, 3=roelvink adapted, 4=roelvink on/off breaking)
breakerdelay                   # Turn on (1) or off (0) breaker delay model
breakviscfac                   # Factor to increase viscosity during breaking
breakvisclen                   # Ratio between local depth and length scale in extra breaking viscosity
bulk                           # Option to compute bedload and suspended load seperately; 0 = seperately, 1 = bulk (as in previous versions)
cats                           # Current averaging time scale for wci, in terms of mean wave periods
cf                             # Friction coefficient flow
cmax                           # Maximum allowed sediment concentration
correctHm0                     # Turn off or on Hm0 correction
delta                          # Fraction of wave height to add to water depth
depthscaledispc                      # depthscale of (lab)test simulated. 1 = default, which corresponds to teh real world (nature)
dispc                          # Coefficient in front of the vertical pressure gradient, Default = 1.
dryslp                         # Critical avalanching slope above water (dz/dx and dz/dy)
dtbc                           # Timestep used to describe time series of wave energy and long wave flux at offshore boundary (not affected by morfac)
dtheta                         # Directional resolution
dwetlayer                      # Thickness of the top soil layer interacting more freely with the surface water
dzmax                          # Maximum bedlevel change due to avalanching
eps                            # Threshold water depth above which cells are considered wet
eps_sd                         # Threshold velocity difference to determine conservation of energy head vs momentum
epsi                           # Ratio of mean current to time varying current through offshore boundary
facAs                          # Calibration factor time averaged flows due to wave asymmetry
facDc                          # Option to control sediment diffusion coefficient [0..1]
facSk                          # Calibration factor time averaged flows due to wave skewness
facrun                         # calibration coefficient for short wave runup
facsd                          # fraction of the local wave length to use for shoaling delay depth
facsl                          # Factor bedslope effect
facua  fcutoff                        # Calibration factor time averaged flows due to wave skewness and asymmetry
fcutoff                        # LowLow-freq cutoff frequency for instat = 4,5,6 boundary conditions
form                           # Equilibrium sed. conc. formulation: 1 = Soulsby van Rijn, 1997, 2 = Van Rijn 2008 with modifications by Van Thiel
frac_dz                        # Relative thickness to split time step for bed updating
fw                             # Bed friction factor
fwcutoff                       # Depth greater than which the bed friction factor is NOT applied
gamma                          # Breaker parameter in Baldock or Roelvink formulation
gamma2                         # End of breaking parameter in break = 4 formulation
gammax                         # Maximum ratio wave height to water depth
hmin                           # Threshold water depth above which Stokes drift is included
hswitch                        # Water depth at which is switched from wetslp to dryslp
hwci                           # Minimum depth until which wave-current interaction is used
jetfac                         # Option to mimic turbulence production near revetments [0..1]
kdmin                          # Minimum value of kd ( pi/dx > minkd )
lws                            # 1 = long wave stirring, 0 = no long wave stirring
lwt                            # Switch 0/1 long wave turbulence
mn                              # Power in cos^mRoelvink directionaldissipation distributionmodel
nc for instat = 0,1,2,3
maxbrsteep                     # Maximum wave steepness criterium
maxerror# Smoothing distance (defined as nr of cells) for estimating umean
nmax             # Maximum wave height error in wave stationary iteration
merge      # maximum ratio of cg/c fro computing long wave boundary conditions
nuh          # Merge threshold for variable sediment layer (ratio to nominal thickness)
n        # Horizontal background viscosity
nuhfac                   # Power in Roelvink dissipation model
nc # Viscosity switch for roller induced turbulent horizontal viscosity
nuhv                    # Smoothing distance (defined as nr of cells)# forLongshore estimatingviscosity umean
nmaxenhancement factor, following Svendsen (?)
order                       # maximum ratio of# cg/cSwitch frofor computingorder longof wave boundary conditions
nrugdepth                      # Number of depths to compute runup in runup gauge
nsetbathysteering, 1 = first order wave steering (short wave energy only), 2 = second oder wave steering (bound long wave corresponding to short wave forcing is added)
por                            # NumberPorosity
reformsteep of prescribed bed updates
nuh                # Wave steepness criterium to reform after breaking
rfb      # Horizontal background viscosity
nuhfac                   # If rfb = 1 then #maximum Viscositywave switchsurface forslope rolleris inducedfeeded turbulentback horizontalin viscosity
nuhvroller energy balance; else rfb = par%Beta
roller                     # Longshore viscosity enhancement factor,# followingTurn Svendsenon (?1)
order or off(0) roller model
rugdepth                       # Minimum Switchdepth for orderdetermination of wavelast steering,wet 1point =in firstrunup ordergauge
scheme wave steering (short wave energy only), 2 = second oder wave steering (bound long wave correspon\
ding to short wave forcing is added)
por   # Use first-order upwind (upwind_1), second order upwind (upwind_2) or Lax-Wendroff (lax_wendroff)
secbrsteep              # Porosity
reformsteep      # Secondary maximum wave steepness criterium
secorder         # Wave steepness criterium to reform after breaking
rfb       # Use second order corrections to advection/non-linear terms based on MacCormack scheme
sedcal          # If rfb = 1 then maximum wave surface slope is feeded back in roller energy# balance;Sediment elsetransport rfbcalibration =coefficient par%Beta
rollerper      grain type
setbathyfile                   # TurnName onof (1)prescribed or off(0) roller model
rugdepthbed update file
shoaldelay                       # MinimumTurn depthon for(1) determinationor ofoff last(0) wet point in runup gauge
schemeshoaling delay
sigfac                         # Usedsig first-orderscales upwindwith log(upwind_1), second order upwind (upwind_2) or Lax-Wendroff (lax_wendroff)
secbrsteepsigfac). Default = 1.3
smag                           # Secondary maximum wave steepness criterium
secorderSwitch for smagorinsky subgrid model for viscocity
smax                       # Use second order corrections# to advection/non-linear terms based on MacCormack scheme
sedcalBeing tested: maximum Shields parameter for ceq Diane Foster
snells                         # Sediment transport calibration coefficient per grain type
setbathy   Turn on (1) or off (0) Snell's law for wave refraction
solver_acc                     # Provideaccuracy timeserieswith ofrespect prescribedto bathy input, 0 = off (default), 1 = on
setbathyfilethe right-hand side used
solver_urelax                  # Underrelaxation parameter
sourcesink    # Name of prescribed bed update file
shoaldelay           # In suspended transport use source-sink terms to calculate bed #level Turnchange on (1) or sus transport offgradients (0) shoaling delay
sigfac 
sprdthr                        # dsigThreshold scalesratio with log(sigfac). Default = 1.3
smag        to maxval of S above which spec dens are read in (default 0.08*maxval)
sus                   # Switch for smagorinsky subgrid model for viscocity
smax  # Calibration factor for suspensions transports [0..1]
sws                   # Being tested: maximum Shields parameter for ceq Diane Foster
snells# 1 = short wave & roller stirring and undertow, 0 = no short wave & roller stirring and undertow
trepfac      # Turn on (1) or off (0) Snell's law for wave refraction
solver_acc       # Compute mean wave period over energy band: par%trepfac*maxval(Sf) for instat 4,5,6; converges to Tm01 for #trepfac accuracy= with respect to the right-hand side used
solver_urelax0.0 and
tsfac                       # Underrelaxation parameter
sourcesink # Coefficient determining Ts = tsfac * h/ws in sediment source term
turb         # In suspended transport use source-sink terms to calculate bed level change (1) or sus transport gradients (0)
split # Switch to include short wave turbulence:
turbadv                   # Split threshold for variable sediment# layer (ratioSwitch 0/1 to nominal thickness)
sprdthr         activate turbulence advection model for short and or long wave turbulence
ucrcal               # Threshold ratio to maxval of S above which  # specCritical densvelocity arecalibration readcoefficient inper (default 0.08*maxval)
susgrain type
umin                           # Threshold velocity for #upwind velocity Calibrationdetection factorand for suspensionsvmag2 transportsin [0..1]
swseq. sediment concentration
waveform                       # Option for waveshape  #model: 1 = short waveRuessink & roller stirring and undertowVan Rijn, 02 = Van noThiel shortde wave & roller stirring and undertow
trepfacVries, 2009
wci                            # Compute mean wave period over energy band: par%trepfac*maxval(Sf) for instat 4,5,6; converges to Tm01 for trepfac = 0.0 and
tsfac   Turns on (1) or off (0) wave-current interaction
wetslp                                  # CoefficientCritical determiningavalanching Tsslope =under tsfac * h/ws in sediment source term
turb                    water (dz/dx and dz/dy)
z0       # Switch to include short wave turbulence:
turbadv                        # SwitchZero 0/1flow tovelocity activatelevel turbulencein advectionSoulsby modelvan forRijn short and or long wave turbulence
ucrcal                         # Critical velocity calibration coefficient per grain type
umin                           # Threshold velocity for upwind velocity detection and for vmag2 in eq. sediment concentration
waveform                       # Option for waveshape model: 1 = Ruessink & Van Rijn, 2 = Van Thiel de Vries, 2009
wavint                         # Interval between wave module calls (only in stationary wave mode)
wci (1997) sed.conc. expression

Marginal sensitivity analysis

The marginal sensitivity analysis is performed using a default dune profile and representative settings for the Dutch coast (normative conditions). Using this model, a single parameter is varied over the applicable range of values. The default values are always included. The sensitivity is subsequently determined by looking at the variation in erosion volume depending on that parameter setting.

Preliminary results are as follows. The first plot shows for each varied parameter the variation in erosion volume above SSL. The black dot indicates the default value. The red line indicates a linear fit excluding any outliers. The second plot shows the minimum and maximum erosion volumes found when varying a parameter over it's valid range of values. The plot is ordered based on the difference between the minimum and maximum value found.

Image Added
Image Added

Zero-influence parameters

Some parameters show no influence at all. This might be due to the fact that a parameter is only applicable to a part of XBeach that is not enabled by default. But it might also mean that there is no influence at all in the case simulated. The zero-influence parameters are discussed below.

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fwcutoff                       # Depth greater than which #the Turnsbed onfriction (1)factor oris off (0) wave-current interaction
wetslpNOT applied
hwci                           # CriticalMinimum avalanchingdepth slopeuntil underwhich water (dz/dx and dz/dy)
z0wave-current interaction is used
jetfac                         # Option to mimic #turbulence Zeroproduction flownear velocity level in Soulsby van Rijn (1997) sed.conc. expression

Marginal sensitivity analysis

The marginal sensitivity analysis is performed using a default dune profile and representative settings for the Dutch coast (normative conditions). Using this model, a single parameter is varied over the applicable range of values. The default values are always included. The sensitivity is subsequently determined by looking at the variation in erosion volume depending on that parameter setting.

Preliminary results are as follows. The first plot shows for each varied parameter the variation in erosion volume above SSL. The black dot indicates the default value. The red line indicates a linear fit excluding any outliers. The second plot shows the minimum and maximum erosion volumes found when varying a parameter over it's valid range of values. The plot is ordered based on the difference between the minimum and maximum value found.

Image Removed
Image Removed

Zero-influence parameters

Some parameters show no influence at all. This might be due to the fact that a parameter is only applicable to a part of XBeach that is not enabled by default. But it might also mean that there is no influence at all in the case simulated. The zero-influence parameters are discussed below.

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revetments [0..1]
dtbc                           # Timestep used to describe time series of wave energy and long wave flux at offshore boundary (not affected by morfac)
sigfac                         # dsig scales with log(sigfac). Default = 1.3
gamma2                         # End of breaking parameter in break = 4 formulation
lwt                            # Switch 0/1 long wave turbulence
waveform                       # Option for waveshape model: 1 = Ruessink & Van Rijn, 2 = Van Thiel de Vries, 2009
facsd                          # fraction of the local wave length to use for shoaling delay depth
hwciz0                             # MinimumZero depthflow untilvelocity whichlevel wave-currentin interactionSoulsby isvan used
scheme   Rijn (1997) sed.conc. expression
betad                      # Use first-order upwind (upwind_1), second order upwind (upwind_2) or Lax-Wendroff (lax_wendroff)
jetfac     # Dissipation parameter long wave breaking turbulence
correctHm0                     # OptionTurn tooff mimicor turbulenceon production near revetments [0..1]
nrugdepth Hm0 correction
BRfac                     # Number of depths to compute# runupCalibration infactor runupsurface gaugeslope
smagbed                            # SwitchCalibration factor for smagorinskybed transports [0..1]
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fwcutoff subgrid model for viscocity
breakviscfac                               # Factor? torelevant increasefor viscosityall
hwci during breaking
sigfac                         # only dsigrelevant scales with log(sigfac). Default = 1.3
gamma2for wci=1, default is wci=0
jetfac                         # Endonly ofrelevant breaking parameter in break = 4 formulation
maxerrorfor swrunup=1, default is swrunup=0
dtbc                       # Maximum wave height error# in? waverelevant stationaryfor iterationall
formsigfac                         # only # Equilibrium sed. conc. formulation: 1 = Soulsby van Rijn, 1997, 2 = Van Rijn 2008 with modifications by Van Thiel
lwsrelevant for kmax>1, default is kmax=1
gamma2                         # ? relevant for break=roelvink1 or break=roelvink2, default is break=roelvink2
lwt        # 1 = long wave stirring, 0 = no long wave stirring
turb         # ? relevant for turbulence computation, which is the default
waveform         # Switch to include short wave turbulence:
facrun        # only possible when turb!=bore_averaged, default is turb=bore_averaged
facsd          # calibration coefficient for short wave runup
sourcesink          # only relevant for shoaldelay=1, default is shoaldelay=0
z0    # In suspended transport use source-sink terms to calculate bed level change (1) or sus transport gradients (0)
lwt        # only relevant for form=soulsby_vanrijn, default is form=vanthiel_vanrijn
betad             #  Switch 0/1 long wave turbulence
roller       # only relevant for lwt=1, default is lwt=0
correctHm0           # Turn on (1) or off(0) roller model
waveform   # ? relevant for all
BRfac                # Option for waveshape model: 1 = Ruessink & Van Rijn,# 2only =relevant Van Thiel de Vries, 2009
turbadvfor rfb=1, default is rfb=0
bed                        # Switch 0/1 to activate# turbulenceonly advectionrelevant model for short and or long wave turbulence
susbulk=0, default is bulk=1
Proposed short list
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titleXBeach parameter long list
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gamma                          # Breaker 
#
parameter 
Calibration
in 
factor
Baldock 
for
or 
suspensions transports [0..1] maxbrsteep # Maximum wave steepness criterium sws
Roelvink formulation
facAs                          # Calibration factor time averaged flows due to wave asymmetry
fw                             # 
1
Bed 
=
friction 
short
factor
beta 
wave
 
&
 
roller
 
stirring
 
and
 
undertow,
 
0
 
=
 
no
 
short
 
wave
 
&
 
roller
 
stirring
 
and
 
undertow Tm01
           # Breaker slope coefficient in roller model
alpha          
#
     
Old
 
name
 
for
 
Trep split
        # Wave dissipation coefficient in Roelvink formulation
wetslp                         # 
Split
Critical 
threshold
avalanching 
for
slope 
variable
under 
sediment layer
water (
ratio
dz/dx 
to nominal thickness
and dz/dy)
wavint
facSk                          # 
Interval
Calibration 
between
factor 
wave
time 
module
averaged 
calls
flows 
(only in stationary
due to wave 
mode)
skewness
rfb
gammax                         
# 
If
Maximum 
rfb = 1 then maximum
ratio wave 
surface
height 
slope
to 
is
water 
feeded
depth
cf 
back
 
in
 
roller
 
energy
 
balance;
 
else
 
rfb
 
= par%Beta snells
                     # 
Turn
Friction 
on (1) or off (0) Snell's law for wave refraction wci # Turns on (1) or off (0) wave-current interaction bulk # Option to compute bedload and suspended load seperately; 0 = seperately, 1 = bulk (as in previous versions) depthscale # depthscale of (lab)test simulated. 1 = default, which corresponds to teh real world (nature) breakvisclen # Ratio between local depth and length scale in extra breaking viscosity dtheta # Directional resolution dtbc # Timestep used to describe time series of wave energy and long wave flux at offshore boundary (not affected by morfac) z0 # Zero flow velocity level in Soulsby van Rijn (1997) sed.conc. expression nsetbathy # Number of prescribed bed updates frac_dz # Relative thickness to split time step for bed updating break # Type of breaker formulation (1=roelvink, 2=baldock, 3=roelvink adapted, 4=roelvink on/off breaking) betad # Dissipation parameter long wave breaking turbulence setbathy # Provide timeseries of prescribed bathy input, 0 = off (default), 1 = on correctHm0 # Turn off or on Hm0 correction oldwbc # (1) Use old version wave boundary conditions for instat 4,5,6 BRfac # Calibration factor surface slope m # Power in cos^m directional distribution for instat = 0,1,2,3 bed # Calibration factor for bed transports [0..1] Cd # Wind drag coefficient fwcutoff # Depth greater than which the bed friction factor is NOT applied merge # Merge threshold for variable sediment layer (ratio to nominal thickness) fcutoff # Low-freq cutoff frequency for instat = 4,5,6 boundary conditions ARC # Switch for active reflection compensation at seaward boundary: 0 = reflective, 1 = weakly (non) reflective shoaldelay # Turn on (1) or off (0) shoaling delay breakerdelay # Turn on (1) or off (0) breaker delay model
Div
styleheight:250px;overflow:auto;
Code Block
languagenone
titleZero-influence parameters (explanations)
linenumberstrue

facsd                          # only relevant for shoaldelay=1, default is shoaldelay=0
hwci                           # only relevant for wci=1, default is wci=0
scheme                         # ? relevant for all
jetfac                         # only relevant for swrunup=1, default is swrunup=0
nrugdepth                      # only relevant for point or runup gauge output
smag                           # ? relevant for all
breakviscfac                   # only relevant for nonh=1 and swave=0, default is nonh=0 and swave=1
sigfac                         # only relevant for kmax>1, default is kmax=1
gamma2                         # ? relevant for break=roelvink1 or break=roelvink2, default is break=roelvink2
maxerror                       # only relevant for stationary wave solver
form                           # ? relevant for all
lws                            # ? relevant for all
turb                           # ? relevant for all
facrun                         # relevant for swrunup=1, default is swrunup=0
sourcesink                     # ? relevant for all
lwt                            # ? relevant for turbulence computation, which is the default
roller                         # ? relevant for all
waveform                       # ? relevant for swave=1, default is swave=1
turbadv                        # ? relevant for all
sus                            # ? relevant for all
maxbrsteep                     # only relevant for nonh=1, default is nonh=0
sws                            # ? relevant for all
Tm01                           # overwritten by Trep
split                          # only relevant for ngd>1, default is ngd=1
wavint                         # only relevant for stationary wave solver
rfb                            # ? relevant for waveform=vanthiel, default is waveform=vanthiel
snells                         # ? relevant for all 1D models
wci                            # ? relevant for all
bulk                           # relevant for all, but should not change outcome, only output
depthscale                     # validity range is irrelevant
breakvisclen                   # only relevant for nonh=1 and swave=0, default is nonh=0 and swave=1
dtheta                         # should not be changed in 1D
dtbc                           # ? relevant for all
z0                             # only relevant for form=soulsby_vanrijn, default is form=vanthiel_vanrijn
nsetbathy                      # only relevant for time-dependent bathy input
frac_dz                        # only relevant for ngd>1, default is ngd=1
break                          # ? relevant for all
betad                          # ? relevant for all
setbathy                       # only relevant for nsetbaty>1, default is nsetbathy=1
correctHm0                     # ? relevant for all
oldwbc                         # only relevant for wbcversion<3, default is wbcversion=3
BRfac                          # only relevant for rfb=1, default is rfb=0
m                              # only relevant for instat<4, default is instat=4
bed                            # ? relevant for all
Cd                             # only relevant for wind input
fwcutoff                       # ? relevant for all
merge                          # only relevant for ngd>1, default is ngd=1
fcutoff                        # ? relevant for all
ARC                            # only relevant for front=abs_2d, default is front=abs_2d, but set to front=abs_1d in 1D case
shoaldelay                     # ? relevant for all
breakerdelay                   # ? relevant for all
Div
styleheight:250px;overflow:auto;
Code Block
languagenone
titleZero-influence parameters (not understood)
linenumberstrue

scheme                         # ? relevant for all
smag                           # ? relevant for all
gamma2                         # ? relevant for break=roelvink1 or break=roelvink2, default is break=roelvink2
form                           # ? relevant for all
lws                            # ? relevant for all
turb                           # ? relevant for all
sourcesink                     # ? relevant for all
lwt                            # ? relevant for turbulence computation, which is the default
roller                         # ? relevant for all
waveform                       # ? relevant for swave=1, default is swave=1
turbadv                        # ? relevant for all
sus                            # ? relevant for all
sws                            # ? relevant for all
rfb                            # ? relevant for waveform=vanthiel, default is waveform=vanthiel
snells                         # ? relevant for all 1D models
wci                            # ? relevant for all
dtbc                           # ? relevant for all
break                          # ? relevant for all
betad                          # ? relevant for all
correctHm0                     # ? relevant for all
bed                            # ? relevant for all
fwcutoff                       # ? relevant for all
fcutoff                        # ? relevant for all
shoaldelay                     # ? relevant for all
breakerdelay                   # ? relevant for all

Expert panel

  • Dano Roelvink
  • Ad Reniers
  • Jaap van Thiel de Vries
  • Robert McCall
  • Ap van Dongeren

Short list

Variation matrix

Resolution vs. dimensions

We can choose either to vary a large number of parameters (dimensions) using a limited resolution or vary a small number of parameters using a high resolution.

Cases
  • Deltaflume ?
  • Deltaflume 2006
  • Boers ?
  • 1953 storm surge

Result

Discussion

Several topics within this workflow are still being discussed. These discussions are briefly mentioned below.

Performance indicators

XBeach allows a variety of performance indicators to be used to compare the performance of one set of settings against another. For example, a profile comparison with measured data may be used by computing a BSS score. The BSS score itself, however, is subject to discussion for this purpose. Moreover, comparison data is often obtained from flume experiments on scale. These experiments use scaling rules that are derived by comparing erosion profiles rather than profile shape. The profile shape for these tests can thus not be used. For now, we use the erosion volume above SSL as performance indicator. Another advantage of this indicator is that it relates well to other calibration studies for dune assessment models in the Netherlands.

Scaling

...

coefficient flow

Expert panel

  • Dano Roelvink
  • Ad Reniers
  • Jaap van Thiel de Vries
  • Robert McCall
  • Ap van Dongeren
  • Gerben Ruessink
  • Kees den Heijer
  • Arnold van Rooijen
  • Joost den Bieman
  • ...
Invitation

Dear XBeach expert,

Deltares is reconsidering the default settings of XBeach for the use of XBeach as advanced assessment model for the Dutch coast. As scientific developer or advanced XBeach user we would like your opinion on this subject.

XBeach provides about 250 parameters to be set by the user. Many of those are related to case-specific input or are related to processes and functionalities that are not relevant for the application as assessment model for the Dutch coast. Discarding all these parameters, still a long list of over 80 parameters will be available to the user.

An assessment model is supposed to be suitable for application by ordinary users. Therefore we would like to minimise the fraction of these 80+ parameters exposed to these users, preferably by a 100% so that only case-specific data is to be provided by the user. In order to do so, we need to offer a default set of parameter settings that are applicable for dune assessment computations along the Dutch coast. We intend to derive such default set of parameters by systematically varying the parameter settings for a selected set of validation cases that are representative for the Dutch coast. Ultimately we will pick the set of parameters that resembles the validation measurements best.

Systematic variation of a set of 80+ parameters is, however, unfeasible. Only if we would pick 2 values per parameter and a single validation case it would take a zillion years to run the necessary computations. Therefore the first step is to eliminate the long list of 80+ parameters to a short list of less than 10 parameters based on expert judgement. This is where your help is appreciated.

Attached to this e-mail you will find a list of the 80+ relevant XBeach parameters. We would like you to assign 25 points to the parameters that should, according to you, be considered in the systematic variation. Optionally, you may indicate a value range for each parameter. We will divide about 10.000 XBeach simulations over the parameters that received the most points. The number of parameters is not set beforehand. We will consider including more parameters (dimensions) over including more variations per parameter (resolution). Parameters that are not included will be set to their current default value.

As a guidance, we also attached two plots that provide some insight in the (marginal) sensitivity of XBeach for the 80+ parameters found in the list. The marginal sensitivity is determined by running a 1D XBeach simulation using a schematised profile representative for the Dutch coast and normative storm conditions representative for the location Hoek van Holland. During each simulation only a single parameter is varied within it's applicable range. Some parameters depend on others (hwci, jetfac, waveform, facsd, z0, betad, BRfac, bed). In these cases both parameters are set, but only the parameter of interest is varied within it's range.

The first plot shows the sensitivity of the erosion volume above SSL for each parameter over it's valid range of values. The black dot depicts the default value. The red line is a linear fit excluding outliers. The second plot shows the range of erosion volumes found when varying each parameter, again excluding outliers. The second plot is ordered based on the variation of erosion volumes found. Outliers are excluded since they often correspond to valid, but unrealistic values (e.g. dzmax=0).

Please use these plots as guidance only. The plots are generated using a single model set-up only and not representative for all cases that should be taken into consideration. Also some parameters with large influence are not good candidates for systematic variation. For example, the parameter "sus" has a large influence, but it is probably not a good idea to calibrate XBeach turning suspended sediment transport on or off. On the other hand, it might not be so useful to include a parameter to the short list that has no influence at all.

A few remarks on the continuation of this calibration effort might be important to your input:

  • We only consider 1D cases (transects)
  • We only consider erosion volumes above SSL as performance indicator (we will look at profiles separately, later on)
  • We will scale the validation cases to prototype scale and run XBeach at that scale (we will look into scaling issues separately, later on)
  • We do not include the depthscale parameter in this study (it is always 1), but we will include the parameters set by the depthscale parameter (we will look into scaling issues seperately, later on)
  • We exclude the following processes / functionalities from calibration beforehand:
    • vegetation
    • wind
    • ships
    • non-hydrostatic
    • drifters
    • mpi
    • morfac
    • discharge
    • groundwater flow
    • beach wizard
    • sediment fractions
    • stationary wave solver

Your input is highly appreciated. You can provide your point assignments by a reply to this e-mail. Any list in any regular file format will do.
If you do not wish to participate, or if you will not be able to provide your input before May, 15th 2014, please let is know.

Best regards,
Bas Hoonhout
Pieter van Geer
http://publicwiki.deltares.nl/display/XBEACH/Default+settings

Short list

Variation matrix

Resolution vs. dimensions

We can choose either to vary a large number of parameters (dimensions) using a limited resolution or vary a small number of parameters using a high resolution.

Cases
  • Deltaflume ?
  • Deltaflume 2006
  • Boers ?
  • 1953 storm surge

Result

Discussion

Several topics within this workflow are still being discussed. These discussions are briefly mentioned below.

Performance indicators

XBeach allows a variety of performance indicators to be used to compare the performance of one set of settings against another. For example, a profile comparison with measured data may be used by computing a BSS score. The BSS score itself, however, is subject to discussion for this purpose. Moreover, comparison data is often obtained from flume experiments on scale. These experiments use scaling rules that are derived by comparing erosion profiles rather than profile shape. The profile shape for these tests can thus not be used. For now, we use the erosion volume above SSL as performance indicator. Another advantage of this indicator is that it relates well to other calibration studies for dune assessment models in the Netherlands.

Scaling

Comparison with data is often done using data obtained from flume experiments. These experiments are performed on scale. XBeach allows us to simulate the experiment at the scale of the experiment rather than on a 1:1 scale. As for now, this is not done for two reasons. First, the scaling within XBeach is still subject to discussion. Second, other calibration studies for dune assessment models also first scaled the experiment results and then performed the calibration.

Depthscale

The depthscale parameter is subject to discussion and should preferably be omitted. It is therefore not part of the long list. A separate study will investigate the scaling performance in XBeach.

Processes / functionalities

What processes / functionalities do we include? Probably not the following:

  • vegetation
  • wind
  • ships
  • non-hydrostatic
  • drifters
  • mpi
  • morfac
  • discharge
  • groundwater flow
  • beach wizard
  • sediment fractions
  • stationary wave solver

But what about:

  • structures
  • short-wave runup
  • shoaling delay
  • breaker delay
  • wave-current interaction
  • long-wave stirring
  • long-wave turbulence

Python toolbox

In order to efficiently perform the workflow described above, some Python tools have been developed. The toolbox is available through the OpenEarthTools repository: https://svn.oss.deltares.nl/repos/openearthtools/trunk/python/applications/xbeach/default_settings. A IPython notebook is available at the same location that illustrates the simple workings of the toolbox.

The main functions are as follows:

Code Block
languagepython

import default_settings

# read and write an overview of available XBeach parameters
default_settings.filesys.write_overview('all_params.txt')
ignore_params = default_settings.filesys.read_overview('ignore_params.txt')

# include dependencies and exclude parameters read from ignore list
dependencies = {'hwci' : {'wci' : 1},
'jetfac' : {'swrunup' : 1},
'waveform' : {'turb' : 'wave_averaged'},
'facsd' : {'shoaldelay' : 1},
'z0' : {'form' : 'soulsby_vanrijn'},
'betad' : {'lwt' : 1},
'BRfac' : {'rfb' : 1},
'bed' : {'bulk' : 0}}

params = default_settings.xbeach.get_parameters(dependencies=dependencies)
params_longlist = {k:v for k,v in params.iteritems() if k not in params_ignored}

# write models for marginal sensitivity analysis
default_settings.filesys.write_models(params_longlist, overwrite=False)

# run models for marginal sensitivity analysis
default_settings.filesys.run_models(overwrite=False)

# monitor model progress
default_settings.filesys.stat_models()

# read erosion volumes above SSL
V = default_settings.filesys.read_volumes()

# plot sensitivity
fig, axs = default_settings.plot.plot_volumes(V, params=params)
fig, axs = default_settings.plot.plot_sensitivity(V, params=params)