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Deterministic landslide stability analysis: an example from NW Oregon Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/1z40kt51r

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  • A slope stability map is created for the Astoria Basin, northwestern Oregon. The stability analysis is based upon a topographically based model, TOPOG model. The model predicts the occurrence of subsurface water-logging which reduces the shear-strength of a slope-profile. Simply stated, subsurface saturated zones occur wherever the local drainage flux exceeds the slope's ability to transmit water. The model is coupled with the infinite slope stability model for analysing the effect of topography on slope stability. The coupled model divides the landscape into four classes based upon its slope stability. The model is simulated using three different rainfall events. The simulations provide a means to observe the behavior of each slope basin at a given rainfall rate. The result of the simulations creates a map that shows the distribution of the slope-stability classes. The map is tested against the active slide occurrences which are mapped in the field and from geological maps. The locations of the active slides seem to be consistent with the unstable slope-classes in the model.
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