National Weather Service Operational Dynamic Wave Model

摘要

In the early 1970's, the NWS Hydrologic Research Laboratory began developing a dynamic wave routing model based on an implicit finite difference solution of the complete one-dimensional St. Venant equations of unsteady flow. This hydrodynamic model, known as DWOPER (Dynamic Wave Operational Model), has recently begun to be implemented where backwater effects and mild bottom slopes are most troublesome for hydrologic routing methods. DWOPER features the ability to use large time steps for slowly varying floods and to use cross-sections spaced at irregular intervals along the river system. The model is generalized for wide applicability to rivers of varying physical features, such as irregular geometry, variable roughness parameters, lateral inflows, flow diversions, off-channel storage, local head losses such as bridge contraction-expansions, lock and dam operations, and wind effects.