start:hype_tutorials:floodplain_tutorial
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start:hype_tutorials:floodplain_tutorial [2018/06/11 08:29] cpers |
start:hype_tutorials:floodplain_tutorial [2021/04/28 07:42] cpers |
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| |Figure 1: Example of determining fraction of floodplain area (''fpfmr'' and ''fpfol''). A represents the whole subbasin area, the subscripts lake and mr, outlet lake and main river, respectively.| | |Figure 1: Example of determining fraction of floodplain area (''fpfmr'' and ''fpfol''). A represents the whole subbasin area, the subscripts lake and mr, outlet lake and main river, respectively.| | ||
| - | * Introduce the area changes in [[start:hype_file_reference:geodata.txt|GeoData.txt]]. A new distribution of the slc-classes' area fractions is needed, reducing the non-water classes area in favor of the water areas. Remember that the new olake area (A3 in the example in Fig 1) is composed of the original outlet lake area (<m> A3_lake </m>) plus the area flooded by the olake (<m> {A3}_{flood lake} </m>); same for the new main river area. The area of the subbasin that is not flooded can be distributed between the non-water classes present in the subbasin before the changes using the same distribution as before or it can be distributed among a subset of these classes. Remember that the sum of all classes' area fractions in a subbasin needs to be one. | + | * Introduce the area changes in [[start:hype_file_reference:geodata.txt|GeoData.txt]]. A new distribution of the slc-classes' area fractions is needed, reducing the non-water classes area in favor of the water areas. Remember that the new olake area (A3 in the example in Fig 1) is composed of the original outlet lake area (<m>A3_lake</m>) plus the area flooded by the olake (<m>{A3}_{flood lake}</m>); same for the new main river area. The area of the subbasin that is not flooded can be distributed between the non-water classes present in the subbasin before the changes using the same distribution as before or it can be distributed among a subset of these classes. Remember that the sum of all classes' area fractions in a subbasin needs to be one. |
| **Elevation thresholds** | **Elevation thresholds** | ||
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| * If no elevation information is available, both the threshold for flow from water body to floodplain (''flmrr'' and ''floll'') and the threshold for flow from floodplain to water body (''flmrp'' and ''flolp'') can be set to zero as a starting value. | * If no elevation information is available, both the threshold for flow from water body to floodplain (''flmrr'' and ''floll'') and the threshold for flow from floodplain to water body (''flmrp'' and ''flolp'') can be set to zero as a starting value. | ||
| - | * For ''modeloption floodmodel 3'', two extra input data are needed (''hrefr'' and ''hrefl''). These are the floodplain threshold in an absolute reference system. For these the values **x2** can be used. | + | * For ''modeloption floodmodel 3'', two extra input data are needed (''hrefr'' and ''hrefl''). These are the floodplain threshold in an absolute reference system. For these the value **x2** can be used. |
| **Recession coefficients** | **Recession coefficients** | ||
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| * Lake, river and floodplains evaporates according to the value of the evaporation parameters (''cevp'', ''ttmp'', both land use dependent) for the land use defined for these classes. | * Lake, river and floodplains evaporates according to the value of the evaporation parameters (''cevp'', ''ttmp'', both land use dependent) for the land use defined for these classes. | ||
| * Surface runoff recession coefficient (''srrcs'', land use dependent) should be set to 1 for lake and river classes with floodplains. Then no water will be left standing on the dry part of the floodplain, but will be added to the flooded water. | * Surface runoff recession coefficient (''srrcs'', land use dependent) should be set to 1 for lake and river classes with floodplains. Then no water will be left standing on the dry part of the floodplain, but will be added to the flooded water. | ||
| + | * There is a possibility to (temporary) replace the some of the data in [[start:hype_file_reference:flooddata.txt|FloodData.txt]] with model parameters (in [[start:hype_file_reference:par.txt|par.txt]]). This possibility can be used to (automatically) calibrate the elevation thresholds and recession coefficients. The parameters are general parameters, and thus only one floodplain can be in the set-up or all floodplains in the set-up will have the same parameter values during calibration. The use of this calibration parameters are set with a parameter ''optonoff'', and the parameters are called ''opt1'', .., ''opt8''. The parameters are described in [[start:hype_file_reference:par.txt|par.txt]]. | ||
start/hype_tutorials/floodplain_tutorial.txt ยท Last modified: 2024/02/05 12:45 by cpers
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