Hydraulic Modeling and Mapping of Mud and Debris Flowsby J. S. O'Brien, FLO Engrg, Breckenridge, United States,
Abstract: The prediction of hyperconcentrated sediment flows on alluvial fans was advanced through the development of a two-dimensional, finite difference flood routing model FLO-2D. The model simulates clear water flood hazards, mudflows and debris flows on urbanized alluvial fans and floodplains. Interactive flood and mudflow routing between the channel, streets and floodplain is accomplished with a uniform grid system which describes the complex floodplain topography. A mudflow event created by the eruption of Mount St. Helen is simulated with FLO-2D. The FLO-2D finite difference grid system is established using computer-aided design (CAD) graphics on a digitized map. A file with FLO-2D predicted flood depths can be imported into the digitized base map drawing and depth contours can be plotted with the CAD software thus automating the flood hazard delineation process.
Subject Headings: Flood routing | Hydrologic models | Flow simulation | Computer aided design | Hydraulic models | Solids flow | Mapping | Simulation models
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