Two-Dimensional Flood Hazard Simulation on Alluvial Fansby J. S. O'Brien, Flow Engrg, Inc, Breckenridge, United States,
Abstract: The incentive for flood hazard delineation on alluvial fans is development. Drainage plans and flood mitigation design require prediction of flow hydraulics for a range of hyperconcentrated sediment flow for clear water to mudflow. Fan flood inundation is a function of the flood hydrograph, unconfined flow, flow in streets, flow around obstructions, and fan rainfall and infiltration. Two-dimensional flood routing using the FLO-2D model to assess these flood attributes and predict floodwave attenuation is a significant improvement over one-dimensional or probabilistic models. Technical standards for alluvial fan flood hazard delineation are discussed along with an example application of FLO-2D.
Subject Headings: Two-dimensional models | Water flow | Flood routing | Hydrologic models | Flow simulation | Alluvial channels
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