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Computer program for stability analysis of steep, cohesive riverbanks
Author(s) -
Darby Stephen E.,
Gessler Dan,
Thorne Colin R.
Publication year - 2000
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/(sici)1096-9837(200002)25:2<175::aid-esp74>3.0.co;2-k
Subject(s) - bank erosion , geotechnical engineering , erosion , factor of safety , geology , bank , hydrology (agriculture) , sediment , slope stability , bank failure , stability (learning theory) , safety factor , channel (broadcasting) , environmental science , computer science , geomorphology , computer network , machine learning , economics , financial system
The ability to predict the stability of eroding riverbanks is a prerequisite for modelling alluvial channel width adjustment and a requirement for predicting bank erosion rates and sediment yield associated with bank erosion. Mass‐wasting of bank materials under gravity occurs through a variety of specific mechanisms, with a separate analysis required for each type of failure. This paper presents a computer program for the analysis of the stability of steep, cohesive riverbanks with respect to planar‐type failures. Planar‐type failures are common along stream channels destabilized by severe bed degradation. Existing stability analyses for planar‐type failures have a number of limitations that affect their physical basis and predictive ability. The computer program presented here is based on an analysis developed by Darby and Thorne. The software takes account of the geotechnical characteristics of the bank materials, the shape of the bank profile, and the relative elevations of the groundwater and surface water to estimate stability with respect to mass failure along a planar‐type failure surface. Results can be displayed either in terms of a factor of safety (ratio of resisting to driving forces), or probability of failure. The computer analysis is able to determine the relative amounts of bed degradation and bank‐toe erosion required to destabilize an initially stable bank. Data for the analysis are supplied in the form of either HEC‐2 hydrographic survey data files or user‐supplied bank profile data, in conjunction with user‐supplied geotechnical parameter values. Some examples, using data from the Upper Missouri River in Montana, are used to demonstrate potential applications of the software. Copyright © 2000 John Wiley & Sons, Ltd.