[Science_Parameters: Science_Category='EARTH SCIENCE', Science_Topic='LAND SURFACE', Science_Term='EROSION/SEDIMENTATION']
A Fortran Program for Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability AnalysisEntry ID: USGS_TRIGRS
Abstract: TRIGRS (Transient Rainfall Infiltration and Grid-based Regional Slope-Stability Model) is a Fortran program for computing transient pore-pressure changes, and attendant changes in the factor of safety, due to rainfall infiltration using the method outlined by Iverson (2000). We have extended Iverson's (2000) method by implementing the solution for complex storms, a solution for additional basal ... boundary conditions, and a simple runoff-routing scheme. The program operates on a gridded elevation model of a map area and accepts input from a series of ASCII text files. Infiltration, hydraulic properties, and slope stability input parameters are allowed to vary over the grid area thus making it possible to analyze complex storm sequences over geologically complex terrain. The optional routing scheme achieves mass balance between rainfall input, infiltration, and runoff over the entire grid by allowing excess water to flow to downslope cells that are receiving less direct precipitation than they are able to absorb. The program saves output to a series of text files that can be imported to GIS software for display or further analysis.
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Role: SERF AUTHOR
Email: Tyler.B.Stevens at nasa.gov
5700 Rivertech Court
Province or State: MD
Postal Code: 20737
Role: TECHNICAL CONTACT
Phone: (800) 654-4966
Fax: (303) 273-8600
Email: highland at usgs.gov
US Geological Survey National Landslide Hazards Program National Landslide Information Center MS 966, Box 25046 Denver Federal Center
Province or State: CO
Postal Code: 80225
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