GRASS logo

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 $


Main index - raster index - Full index

© 2003-2011 GRASS Development Team