In Step 7 a ModuleConfigFile is produced which uses a PCRaster transformation. This PCRaster transformation is used to calculate the lateral inflows. The lateral inflow at the river branches are shown in the accretion profiles. The accretion profile gives a clear overview of the different influences on the river discharge. Because Modflow only provides the surface water flow (QSTR_ACCU) of all streamcells, a PCraster transformation is necessary. When a tributary reaches the river branch, PCRaster sums the discharges of the upstream river cells. PCRaster executes the following 3 steps:

  1. PCRaster determines the discharge of the tributaries; the flow of the branch rivers is substracted from the total surface water flow.
    only_Q_tributaries = Qflow * branches_grid;
  2. Sums the discharges of all upstream river cells
    sum_Q_tributaries = upstream(stream_directions, only_Q_tributaries);
  3. Make the map with discharges of all upstream river cells at the crossing points of rivers.
    Output = sum_Q_tributaries * cross_points;

This PCRaster tranformation needs input to be able to run and therefore the following xml files have to be created:

  • Module configuration files
    • XXX 1_interpolate_grid_to_branch_grid
    • XXX 1_PCR_generate_branch_file
    • XXX 1_QTRIB_ref(Historic)
  • workflow file
    • XXX 1_configuration_only
      1 = model abbreviation

Besides the xml files the following files in the Modules directory should be generated:

  • Fixed
    • Ldd.map
    • Strdir.map
    • Scalar.map
  • fromNGMS
    • branch0000.000
  • toNGMS
    • branches_grid.map
    • cross_points.map
    • stream_directions.map

In order to create the above mentioned files it is necessary to follow the instructions below

  1. Import the branch locations into PCRaster. This is done with the PCRaster general adaptor export, which produces branch0000.000 file.
    • Copy the X and Y locations from the Branches.xml and make an new irregular grid (XXX_branch_grid) in Grids.xml
    • Make a new location ID for XXX_branch_grid.
    • Make XXX_interpolate_grid_to_branch_grid file. This file converts the locationid from XXX_merged to the XXX_branch_grid. And back to the XXX_merged grid, making use of inverse distance interpolation technique. Adapt the search radius to grid size. (= smaller than half a grid cell)
    • Make general adaptor run file: XXX_PCR_generate_branch_file. This file exports the branch0000.000 file.
  2. Make stream flow direction map.
    • Export the stream flow direction map with the Modflow general adaptor by running the XXX_prepare.bat. The exported stream direction map file "XXX_Streamflow_Directions.asc" can be found in the "toNGMS" folder.
    • Rename this stream flow direction asci file into "strdir.asc"
  3. Make initial scalar and ldd map
    • use mapattr command to produce scalar.map -> mapattr scalar.map
      number of columns =360
      number of rows=240
      data type = scalar
      projection= y increases from bottom to top
      x upperleft corner=400000
      y upperleft corner=170000
      celllength = 250
    • use mapattr command to produce ldd.map -> mapattr ldd.map
      number of colums =360
      number of rows=240
      data type = ldd
      projection= y increases from bottom to top
      x upperleft corner=400000
      y upperleft corner=170000
      celllength = 250
  4. Make a new temporary workflow (e.g. XXX_configuration_only) and adapt the WorkflowDescriptorDescriptors and the ModuleinstanceDescriptors file
  5. Run workflow XXX_PCR_generate_branch_file. This run produces the following files: branches_grid.map, cross_points.map and stream_directions.map
  6. make XXX_QTRIB_ref(Historic) transformation file (as described in step 7 using the moduleinstance generation spreadsheet)
  7. adapt interpolation and compare files (as described in step 7 using the moduleinstance generation spreadsheet)
  8. adapt Moduledescriptor and ModuleinstanceDescriptors if still applicable

The instructions are also explained in the attached word document, which also includes some examples of resulting files.

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