Using simulated hydrologic response to revisit the 1973 Lerida Court landslide |
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| Authors: | Susan H BeVille Benjamin B Mirus Brian A Ebel George G Mader Keith Loague |
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| Institution: | (1) Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA;(2) Spangle Associates, 770 Menlo Avenue, Suite 200, Menlo Park, CA 94025-4736, USA;(3) Present address: CH2M Hill, Raleigh, NC, USA;(4) Present address: U.S. Geological Survey, Menlo Park, CA, USA; |
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| Abstract: | Hydrologically driven mass wasting in the form of landslides on steep slopes is a worldwide occurrence. High-profile events
in, for example, Brazil, Chile, the Philippines, Puerto Rico, and Venezuela during the last three decades all clearly illustrate,
based upon significant losses of life and property, that hydrologically driven slope instability in developed (urban) areas
can be a major geologic/environmental hazard. The focus of this study is the 1973 hydrologically driven Lerida Court landslide
in Portola Valley, CA, USA. Physics-based hydrologic-response simulation, with the comprehensive Integrated Hydrology Model,
was employed to forensically estimate the spatiotemporal pore pressure distributions for the Lerida Court site. Slope stability,
driven by the simulated pore pressure dynamics, was estimated for the Lerida Court site with the infinite slope/Factor of
Safety approach. The pore pressure dynamics for the Lerida Court site were reasonably captured by the hydrologic-response
simulation. The estimated time of slope failure for the Lerida Court site compares well with field observations. A recommendation
is made that hydrologically driven slope stability estimates including variably saturated subsurface flow be standard protocol
for development sites in steep urban settings. |
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