Tool WEDGEFAIL
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.
Reference:
Günther A., Wienhöfer J., Konietzky H. (2012) Automated mapping of rock slope geometry, kinematics and stability with RSS-GIS. Natural Hazards, 61, 29-49..
- Author: A. Günther (c) 2012
- Menu: Terrain Analysis|Slope Stability
Parameters
| Name | Type | Identifier | Description | Constraints | |
|---|---|---|---|---|---|
| Input | DEM | Grid (input) | DEM | A DEM | - |
| Dip/Plunge direction grid (degree) (*) | Grid (optional input) | C | A dip- or plunge direction grid (in degrees) | - | |
| Dip/Plunge grid (degree) (*) | Grid (optional input) | D | A dip- or plunge grid (in degrees) | - | |
| Min friction angle grid (degree) (*) | Grid (optional input) | Emin | A minimum discontinuity friction angle grid (in degrees) | - | |
| Max friction angle grid (degree) (*) | Grid (optional input) | Emax | A maximum discontinuity friction angle grid (in degrees) | - | |
| Output | Failures | Grid (output) | F | Resulting failure cells (-) grid | - |
| Options | Grid system | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
| Global dip/plunge direction (degree) | Floating point | fC | Constant value if no raster set | Default: 0.000000 | |
| Global dip/plunge (degree) | Floating point | fD | Constant value if no raster set | Default: 35.000000 | |
| Min global friction angle (degree) | Floating point | fEmin | Constant value if no raster set | Default: 35.000000 | |
| Max global friction angle (degree) | Floating point | fEmax | Constant value if no raster set | Default: 35.000000 | |
| Cone radius (degree) | Integer | ff | Radius of optional cone variance (in degrees) | Default: 0 | |
| Parameter sampling runs | Integer | fI | Number of sampling cycles | Default: 1 | |
| Mode | Choice | METHOD | Set failure mode | Available Choices: [0] Slide [1] Topple Default: 0 | |
| (*) optional | |||||
Command-line
Usage: saga_cmd ta_slope_stability 4 [-DEM <str>] [-C <str>] [-D <str>] [-Emin <str>] [-Emax <str>] [-fC <double>] [-fD <double>] [-fEmin <double>] [-fEmax <double>] [-ff <num>] [-F <str>] [-fI <num>] [-METHOD <str>] -DEM:<str> DEM Grid (input) -C:<str> Dip/Plunge direction grid (degree) Grid (optional input) -D:<str> Dip/Plunge grid (degree) Grid (optional input) -Emin:<str> Min friction angle grid (degree) Grid (optional input) -Emax:<str> Max friction angle grid (degree) Grid (optional input) -fC:<double> Global dip/plunge direction (degree) Floating point Default: 0.000000 -fD:<double> Global dip/plunge (degree) Floating point Default: 35.000000 -fEmin:<double> Min global friction angle (degree) Floating point Default: 35.000000 -fEmax:<double> Max global friction angle (degree) Floating point Default: 35.000000 -ff:<num> Cone radius (degree) Integer Default: 0 -F:<str> Failures Grid (output) -fI:<num> Parameter sampling runs Integer Default: 1 -METHOD:<str> Mode Choice Available Choices: [0] Slide [1] Topple Default: 0