r.shalstab dem=name phy=name c_soil=name gamma=name z=name k=name [root=name] susceptibility=susceptibility critic_rain=critical rain [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

--overwrite

Allow output files to overwrite existing files

--help

Print usage summary

--verbose

Verbose module output

--quiet

Quiet module output

--ui

Force launching GUI dialog

Parameters:

dem=name [required]

Name of input elevation raster map

phy=name [required]

Soil friction angle (angle)

c_soil=name [required]

Soil cohesion (N/m^2)

gamma=name [required]

Soil density(Kg/m^3)

z=name [required]

Vertical thickness of soil (m)

k=name [required]

hydraulic conductivity (m/h)

root=name

Root cohesion k (N/m^2)

susceptibility=susceptibility [required]

Name for output landslide susceptibility map (from 1 to 7)

critic_rain=critical rain [required]

Name for output critical rainfall map (mm/day)

R.shalstab

This command allows to apply the algorithm developed by Montgomery and Dietrich (1994) in GRASS GIS. According to these authors, the models associate the theories of infinite slope, where the strength of soil share at the discretion of rupture of Mohr Coulomb, with the hydrological model O'Loughlin (1986), resulting in equation. Requested input and output. The command requires some input:

• DEM a digital terrain model of the study area;
• Raster map or single value for soil cohesion (N/m^2);
• Raster map or single value for soil friction angle (°);
• Raster map or single value for soil density (kg/m^3);
• Raster map or single value for vertical thickness of soil (m);
• Raster map or single value for hydraulic conductivity k (m/h);
• Raster map or single value for root cohesion (N/m^2); (default = 0)
• Raster map or single value for wet soil density (kg/m^3). (default = 2100)

The output are:

A landslide susceptibility map (value range from 1 to 7):

• 1 Unconditionally Unstable
• 2 0-30 mm/day
• 3 31-100 mm/day
• 4 101-150 mm/day
• 5 151-200 mm/day
• 6 201-999 mm/day
• 7 Stable

A map for of critical rainfall map (mm/day)

Andrea Filipello, University of Turin, Italy mail

Daniele Strigaro, University of Milan, Italy mail

Montgomery, D. R. and Dietrich, W. E.: A physically based model for the topographic control of shallow landsliding,Water Resour. Res., 30, 1153–1171, 1994.