Tool Top Soil Water Content

The WEELS (Wind Erosion on European Light Soils) soil moisture model estimates the top soil water content on a daily basis using the Haude approach for evapotranspiration (cf. DVWK 1996). Input data is

daily weather
- precipitation
- temperature
- air humidity
soil properties
- field capacity
- permanent wilting point
crop type

References

Boehner, J., Schaefer, W., Conrad, O., Gross, J., Ringeler, A. (2001): The WEELS Model: methods, results and limits of wind erosion modelling. In: Catena, Special Issue. doi:10.1016/S0341-8162(03)00019-5.
DVWK (Deutscher Verband fuer Wasserwirtschaft und Kulturbau) (1996): Determination of evaporation and transpiration from land and water surfaces. DVWK Leaflet Series for Water Management no.238, Bonn, 135p. DVWK-M 238.

Author: O.Conrad (c) 2002
Menu: Simulation|Soil Hydrology

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Field Capacity (*)	Grid, input, optional	`STA_FC`	[mm]	-
	Permanent Wilting Point (*)	Grid, input, optional	`STA_PWP`	[mm]	-
	Land Use (*)	Grid, input, optional	`LANDUSE`	-	-
Output	Soil Moisture	Grid, output	`DYN_W`	-	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Default	Floating point	`STA_FC_DEFAULT`	default value if no grid has been selected	Minimum: 0.000000 Maximum: 100.000000 Default: 20.000000
	Default	Floating point	`STA_PWP_DEFAULT`	default value if no grid has been selected	Minimum: 0.000000 Maximum: 100.000000 Default: 2.000000
	Default	Integer	`LANDUSE_DEF`	-	Default: -1
	Climate Data	Static table	`DYN_CLIMATE`	-	3 Fields: - 1. [8 byte floating point number] Precipitation [mm] - 2. [8 byte floating point number] Temperature [2pm Deg.C] - 3. [8 byte floating point number] Air Humidity [2pm [%]
	Crop Coefficients	Static table	`STA_KC`	-	14 Fields: - 1. [signed 4 byte integer] Land Use ID - 2. [string] Name - 3. [8 byte floating point number] January - 4. [8 byte floating point number] February - 5. [8 byte floating point number] March - 6. [8 byte floating point number] April - 7. [8 byte floating point number] May - 8. [8 byte floating point number] June - 9. [8 byte floating point number] July - 10. [8 byte floating point number] August - 11. [8 byte floating point number] September - 12. [8 byte floating point number] October - 13. [8 byte floating point number] November - 14. [8 byte floating point number] December
(*) optional

Command-line

Usage: saga_cmd sim_hydrology 0 [-STA_FC <str>] [-STA_FC_DEFAULT <double>] [-STA_PWP <str>] [-STA_PWP_DEFAULT <double>] [-LANDUSE <str>] [-LANDUSE_DEF <num>] [-DYN_W <str>] [-DYN_CLIMATE <str>] [-STA_KC <str>]
  -STA_FC:<str>            	Field Capacity
	Grid, input, optional
  -STA_FC_DEFAULT:<double> 	Default
	Floating point
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 20.000000
  -STA_PWP:<str>           	Permanent Wilting Point
	Grid, input, optional
  -STA_PWP_DEFAULT:<double>	Default
	Floating point
	Minimum: 0.000000
	Maximum: 100.000000
	Default: 2.000000
  -LANDUSE:<str>           	Land Use
	Grid, input, optional
  -LANDUSE_DEF:<num>       	Default
	Integer
	Default: -1
  -DYN_W:<str>             	Soil Moisture
	Grid, output
  -DYN_CLIMATE:<str>       	Climate Data
	Static table
	3 Fields:
	- 1. [8 byte floating point number] Precipitation [mm]
	- 2. [8 byte floating point number] Temperature [2pm Deg.C]
	- 3. [8 byte floating point number] Air Humidity [2pm [%]
	
  -STA_KC:<str>            	Crop Coefficients
	Static table
	14 Fields:
	- 1. [signed 4 byte integer] Land Use ID
	- 2. [string] Name
	- 3. [8 byte floating point number] January
	- 4. [8 byte floating point number] February
	- 5. [8 byte floating point number] March
	- 6. [8 byte floating point number] April
	- 7. [8 byte floating point number] May
	- 8. [8 byte floating point number] June
	- 9. [8 byte floating point number] July
	- 10. [8 byte floating point number] August
	- 11. [8 byte floating point number] September
	- 12. [8 byte floating point number] October
	- 13. [8 byte floating point number] November
	- 14. [8 byte floating point number] December