Numerical Simulation of Mudflows from the Hypothetical Failure of a Debris Blockage Lake Below Mount St. Helens, WA

by Robert C. MacArthur, Hydrologic Engineering Cent, Davis, United States,
Douglas L. Hamilton, Hydrologic Engineering Cent, Davis, United States,
Ronald C. Mason, Hydrologic Engineering Cent, Davis, United States,

Document Type: Proceeding Paper

Part of: Hydraulics/Hydrology of Arid Lands (H²AL)

Abstract: This paper evaluates the characteristics of mudflow events resulting from the hypothetical breaching of a debris blockage dam using a variety of lake levels and impounded water volumes for the initial breach conditions. A one-dimensional (Petrov- Galerkin finite element) unsteady mudflow routing model is used to simulate the movement of the dam break-induced mudflow events downvalley through the Corps of Engineers' Sediment Retention Structure.

Subject Headings: Numerical models | Landslides | Lakes | Debris | Failure analysis | Structural models | Hydrologic models | Mathematical models | Hydraulic models | Simulation models | Washington | North America | United States

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