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

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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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