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title	Zero-influence parameters (explanations)
linenumbers	true

fwcutoff                       # ? relevant for all
hwci                           # only relevant for wci=1, default is wci=0
jetfac                         # only relevant for swrunup=1, default is swrunup=0
dtbc                           # ? relevant for all
sigfac                         # only relevant for kmax>1, default is kmax=1
gamma2                         # ? relevant for break=roelvink1 or break=roelvink2, default is break=roelvink2
lwt                            # ? relevant for turbulence computation, which is the default
waveform                       # only possible when turb!=bore_averaged, default is turb=bore_averaged
facsd                          # only relevant for shoaldelay=1, default is shoaldelay=0
z0                             # only relevant for form=soulsby_vanrijn, default is form=vanthiel_vanrijn
betad                          # only relevant for lwt=1, default is lwt=0
correctHm0                     # ? relevant for all
BRfac                          # only relevant for rfb=1, default is rfb=0
bed                            # only relevant for bulk=0, default is bulk=1

Proposed short list

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language	none
title	XBeach parameter long list
linenumbers	true


delta                          # Fraction of wave height to add to water depth

BRfac

facua                          # Calibration factor time averaged flows due to wave skewness and asymmetry
facAs

#

Calibration

factor

surface

slope C

               # Calibration factor time averaged flows due to wave asymmetry
fw

#

Chezy

coefficient CFL

             # Bed friction factor
beta

#

Maximum

Courant-Friedrichs-Lewy

number Tbfac

            # Breaker slope coefficient in roller model
alpha

#

Calibration

factor

for

bore

interval

Tbore:

Tbore

=

Tbfac*Tbore Tsmin

         # Wave dissipation coefficient in Roelvink

formulation
wetslp

#

Minimum

adaptation

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 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 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) 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 facsd # fraction of the local wave length to use for shoaling delay depth facsl # Factor bedslope effect facua # Calibration factor time averaged flows due to wave skewness and asymmetry fcutoff # Low-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 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 n # Power in Roelvink dissipation model nc # Smoothing distance (defined as nr of cells) for estimating umean nmax # maximum ratio of cg/c fro computing long wave boundary conditions nuh # Horizontal background viscosity nuhfac # Viscosity switch for roller induced turbulent horizontal viscosity nuhv # Longshore viscosity enhancement factor, following Svendsen (?) order # Switch for order of wave steering, 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 # Porosity reformsteep # Wave steepness criterium to reform after breaking rfb # If rfb = 1 then maximum wave surface slope is feeded back in roller energy balance; else rfb = par%Beta roller # Turn on (1) or off(0) roller model rugdepth # Minimum depth for determination of last wet point in runup gauge scheme # Use first-order upwind (upwind_1), second order upwind (upwind_2) or Lax-Wendroff (lax_wendroff) secbrsteep # Secondary maximum wave steepness criterium secorder # Use second order corrections to advection/non-linear terms based on MacCormack scheme sedcal # Sediment transport calibration coefficient per grain type setbathyfile # Name of prescribed bed update file shoaldelay # Turn on (1) or off (0) shoaling delay sigfac # dsig scales with log(sigfac). Default = 1.3 smag # Switch for smagorinsky subgrid model for viscocity smax # Being tested: maximum Shields parameter for ceq Diane Foster snells # Turn on (1) or off (0) Snell's law for wave refraction solver_acc # accuracy with respect to the right-hand side used solver_urelax # Underrelaxation parameter sourcesink # In suspended transport use source-sink terms to calculate bed level change (1) or sus transport gradients (0) sprdthr # Threshold ratio to maxval of S above which spec dens are read in (default 0.08*maxval) sus # Calibration factor for suspensions transports [0..1] sws # 1 = short wave & roller stirring and undertow, 0 = no short wave & roller stirring and undertow trepfac # 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 # Coefficient determining Ts = tsfac * h/ws in sediment source term turb # Switch to include short wave turbulence: turbadv # Switch 0/1 to activate turbulence advection model for 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

=

Critical

Van

avalanching

Thiel

slope

de

under

Vries, 2009 wci

water (dz/dx and dz/dy)
facSk                          #

Turns

Calibration factor

on

time

(1)

averaged

or

flows

off

due

(0)

to wave

-current

interaction

skewness

wetslp

hmin

#

Critical

avalanching

slope

Threshold

under

water

(dz/dx and dz/dy) z0

depth above which Stokes drift is included
hswitch                        #

Zero

Water

flow

depth

velocity

at

level

which

in

is

Soulsby

switched

van

from

Rijn

wetslp

(1997) sed.conc. expression

to dryslp

Expert panel

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

...

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.

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Proposed short list

Expert panel