Journal of Hydraulic Engineering · 1985 · 15 citations · 3 references
Natural ResourcesEarth SciencesHydrologyFluid DynamicsHydrologic ModelingSubsurface Fluid FlowFlood Inundation ModelingFlow ModelingFlow Regime CharacterizationFlow RegimesSubsurface FlowCross-sectional Floodplain AnalysisFloodplain Cross-section AnalysisFlow Regime EvolutionFlow Regime ModelingFlow Regime PredictionFroude Number
A Froude number that is applicable to subdivisions of a cross section is developed assuming one-dimensional flow. The subdivision Froude number is shown to determine accurately the flow regime in subdivisions of a cross section. An imaginary subdivision Froude number in a floodplain indicates that the velocity is increasing with depth and that a one-dimensional flow assumption may be invalid. Mixed flow regimes at a cross section which invalidate the standard step method can be recognized with the subdivision Froude number. A total of 193 cross sections were tested with a modified version of HEC2; eleven had a mixed flow regime and 36 had at least one imaginary Froude number.
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