The wflow_wave Model¶
The documentation of this model is incomplete
An experimental implementation of the full dynamic wave equations has been implemented. The current implementation is fairly unstable and very slow.
However, in flat of tidal areas and areas that flood the dynamic wave can provide much better results. The plot below is from the Rio Mamore in Bolivia in the lower partes of the river with extensive wetlands that flood nearly each year.
This module is setup to be run in an existing case and runid of a wflow_sbm or wflow_hbv model. In order for wflow_wave to run they must have saved discharge and waterlevel for each timesteps. This output will be used as a forcing for the dynamic wave module. The wflow_wave module will also use the existing ldd and DEM
It needs anumber of settings in the ini file. The default name for the file is wflow_wave.ini. it is also possible to insert this section in the wflow_sbm or wflow_hbv ini file and point to that file.
See below for an example:
[inputmapstacks] # Name of the mapstack with discharge (output from the hydrological model) Q = run # Name of the mapstack with waterlevel (output from the hydrological model) H = lev [dynamicwave] # Number of timeslices per dynamic wave substep TsliceDyn=100 # number of substeps for the dynamic wave with respect to the model timesteps dynsubsteps=24 # map with level boundary points wflow_hboun = staticmaps/wflow_outlet.map # Optional river map for the dynamic wave that must be the same size or smaller as that of the # kinematic wave wflow_dynriver = staticmaps/wflow_dynriver.map # a fixed water level for each non-zero point in the wflow_hboun map # level > 0.0 use that level # level == 0.0 use supplied timeseries (see levelTss) # level < 0.0 use upstream water level fixedLevel = 3.0 # if this is set the program will try to keep the volume at the pits at # a constant value lowerflowbound = 1 # instead of a fixed level a tss file with levels for each timesteps and each # non-zero value in the wflow_hboun map #levelTss=intss/Hboun.tss # If set to 1 the program will try to optimise the timestep # Experimental, mintimestep is the smallest to be used AdaptiveTimeStepping = 1 mintimestep =0.1
A description of the implementation of the dynamicwave is given on the pcraster website.
In addition to the settings in the ini file you need to give the model additional maps or lookuptables in the staticmaps or intbl directories:
ChannelDepth.[map|tbl] - depth of the main channel in metres
ChannelRoughness.[map|tbl] - 1/n n = manning roughness coefficient (default = 1/0.03)
ChannelForm.[map|tbl] - form of the channel (default = 1.0)
FloodplainWidth.[map|tbl] - width of the floodplain in metres (default = 0)
The following variables for the dynamicwave function are set as follows and are taken from the hydrological model run by default:
ChannelBottomLevel - Taken from the dem (wflow_dem.map in the staticmaps dir)
ChannelLength - Taken from the length in the kinematic wave (DCL.map from the outsum dir)
ChannelBottomWidth - taken from the wflow_riverwidth map from the outsum dir