Tool Name	WEDGEFAIL
Tool ID	4
Library ID	ta_slope_stability
Version	1.0
Author(s)	A. Günther (c) 2012

Description

This tool determines terrain elements where failure (slide- or topple movements) on geological discontinuies are kinematically possible through the spatial application of common frictional feasibility criteria (Günther et al. 2012 and references therein). Both the orientation of slope elements specified through aspect- and dip grids (in radians) are required together with the orientation of one planar structure defined through global- or grid dip direction and dip data, or two planar structures defined by plunge direction and plunge information of their intersection line (in degrees). The shear strength of the discontinuities is specified using global or grid-based friction angle data. Optionally, a cone value can be set allowing for some variance in discontinuity dip orientations. The tool operates in slide (testing for plane and wedge sliding) or topple (testing for plane and wedge toppling) modes.

References

Günther, A., Wienhöfer J., Konietzky H. (2012): Automated mapping of rock slope geometry, kinematics and stability with RSS-GIS. Natural Hazards, 61, 29-49.

Parameters

Name	Type	Identifier	Description	Constraints
Input
DEM	grid, input	DEM	A DEM
Dip/Plunge direction grid (degree)	grid, input, optional	C	A dip- or plunge direction grid (in degrees)
Dip/Plunge grid (degree)	grid, input, optional	D	A dip- or plunge grid (in degrees)
Min friction angle grid (degree)	grid, input, optional	Emin	A minimum discontinuity friction angle grid (in degrees)
Max friction angle grid (degree)	grid, input, optional	Emax	A maximum discontinuity friction angle grid (in degrees)
Output
Failures	grid, output	F	Resulting failure cells (-) grid
Options
Global dip/plunge direction (degree)	floating point number	fC	Constant value if no raster set	Default: 0.000000
Global dip/plunge (degree)	floating point number	fD	Constant value if no raster set	Default: 35.000000
Min global friction angle (degree)	floating point number	fEmin	Constant value if no raster set	Default: 35.000000
Max global friction angle (degree)	floating point number	fEmax	Constant value if no raster set	Default: 35.000000
Cone radius (degree)	integer number	ff	Radius of optional cone variance (in degrees)	Default: 0
Parameter sampling runs	integer number	fI	Number of sampling cycles	Default: 1
Mode	choice	METHOD	Set failure mode	Available Choices: [0] Slide [1] Topple Default: 0