
NAME
r.uslek - Computes USLE Soil Erodibility Factor (K).
KEYWORDS
raster, hydrology, soil, erosion
SYNOPSIS
r.uslek
r.uslek help
r.uslek psand=name pclay=name psilt=name pomat=name output=name [--overwrite] [--verbose] [--quiet]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- psand=name
- Name of soil sand fraction raster map [0.0-1.0]
- pclay=name
- Name of soil clay fraction raster map [0.0-1.0]
- psilt=name
- Name of soil silt fraction raster map [0.0-1.0]
- pomat=name
- Name of soil organic matter raster map [0.0-1.0]
- output=name
- Name for output USLE K factor raster map [t.ha.hr/ha.MJ.mm]
DESCRIPTION
r.uslek calculates the USLE K factor, that is the Soil Erodibility Factor.
It takes input of soil texture classes (sand, clay, silt) and organic matter, all in range of [0.0-1.0]. The FAO World Soil CD documentation was used to produce the conversion system between soil textures and soil classes. The soil classes are in number of 12 and apparently come from a USDA publication of 1951 (p.209). Once the soil classes have been identified (by vector cross-products tests), a general conversion table was applied for transforming soil classes into K factor.
NOTES
r.watershed provides for USLE L,S,LS factors.
TODO
SEE ALSO
r.usler
r.watershed
AUTHORS
Yann Chemin, SIC-ISDC, Turkmenistan
Last changed: $Date: 2006/09/31 15:20:43 $
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