ta_slope_stability_2-SHALSTAB

SHALSTAB

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contributed at 2018-11-06

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Geography SubjectGIScience & Remote SensingTerrain Analysis

Detailed Description

This tool is a realization of the SHALSTAB (Shallow Slope Stability) model from Montgomery & Dietrich (1994). The model computes grid cell critical shallow groundwater recharge values (CR in mm/day) as a measure for relative shallow slope stability, utilizing a simple model that combines a steady-state hydrologic model (a topographic wetness index) to predict groundwater pressures with an infinite slope stability model. For computation, a slope (in radians) and a catchment area (in m2) grid are required. Additionally, information on material density (g/cm3), material friction angle (°), material hydraulic conductivity (m/hr), bulk cohesion (MPa) and depth to potential shear plane (m) are required that can be specified either globally or through grids. The tool produces a continuous CR (mm/day) raster with unconditionally stable cells blanked, and unconditionally unstable cells as CR = 0. Optionally, a classified CR grid can be calculated representing seven stability classes.Reference: Montgomery D. R., Dietrich, W. E. (1994) A physically based model for the topographic control on shallow landsliding. Water Resources Research, 30, 1153-1171..

How to cite

SAGA (2018). ta_slope_stability_2-SHALSTAB, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/dcf558ac-4985-4bc6-904c-8a7342d5911a
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contributed at 2018-11-06

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