Evaluation of Flood-Level Prediction Using Alluvial-River Models

摘要

Many communities, primarily in the western states, had experienced problems with computing flood-water elevations for flood insurance purposes under the Federal Emergency Management Agency's National Flood Insurance Program. These problems focussed on modeling channel erosion and sedimentation using fixed-bed models for flood insurance studies in communities affected by rivers with movable beds or alluvial channels. The study involved application of six flow and sediment routing models for alluvial streams on reaches of selected rivers for which relatively complete data were available. The objective of this investigation was to determine whether river-bed degradation during flood passage has an effect on flood stage that should be incorporated into the calculation of flood-zone limits.