start:hype_tutorials:floodplain_tutorial
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start:hype_tutorials:floodplain_tutorial [2018/06/12 09:04] cpers |
start:hype_tutorials:floodplain_tutorial [2024/02/05 12:45] (current) cpers |
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| - area related data; area fractions between floodplain, water bodies and subbasins (including ''fpfol'', ''fpfmr'') | - area related data; area fractions between floodplain, water bodies and subbasins (including ''fpfol'', ''fpfmr'') | ||
| - elevation thresholds; thresholds between water body and flood plain and between water body and downstream lake/river (''floll'', ''flolp'', ''flmmr'', ''flmrp'', ''fymol'', ''fymmr'') | - elevation thresholds; thresholds between water body and flood plain and between water body and downstream lake/river (''floll'', ''flolp'', ''flmmr'', ''flmrp'', ''fymol'', ''fymmr'') | ||
| - | - recession coefficients; coefficients to regulate the flow between water body and floodplain (''rclfp'', ''rclpl'', ''rclfp'', ''rclpr''). | + | - recession coefficients; coefficients to regulate the flow between water body and floodplain (''rclfp'', ''rcfpl'', ''rcrfp'', ''rcfpr''). |
| These input data can be estimated in different ways. The suggestion here is to define those that can be observed/derived relatively easy from data (area and elevation threshold) and manually calibrate the others (recession coefficients). A method to do that is described below: | These input data can be estimated in different ways. The suggestion here is to define those that can be observed/derived relatively easy from data (area and elevation threshold) and manually calibrate the others (recession coefficients). A method to do that is described below: | ||
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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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| * 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]]. | + | * 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''. Different values for optonoff will replace different sets of floodplain data. You can replace none (optonoff=0) or all of them (optonoff=1), but alternatively replace only thresholds (optonoff=2), only recessioncoefficients (optonoff=3) or only maximum extent of floodplain (optonoff=4). |
| + | |||
| + | | ''opt1'' | replacing ''floll'' | | ||
| + | | ''opt2'' | replacing ''flolp'' | | ||
| + | | ''opt3'' | replacing ''flmrr'' | | ||
| + | | ''opt4'' | replacing ''flmrp'' | | ||
| + | | ''opt5'' | replacing ''rclfp'' and ''rcrfp'' | | ||
| + | | ''opt6'' | replacing ''fymol'' | | ||
| + | | ''opt7'' | replacing ''fymmr'' | | ||
| + | | ''opt8'' | replacing ''rcfpl'' and ''rcfpr'' | | ||
| + | |||
| + | The parameters are described in [[start:hype_file_reference:par.txt|par.txt]]. | ||
start/hype_tutorials/floodplain_tutorial.1528787089.txt.gz · Last modified: 2023/11/16 14:28 (external edit)
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