Accession Number : ADA311054

Title :   Flow Transitions in Bridge Backwater Analysis.

Descriptive Note : Research rept.,

Corporate Author : HYDROLOGIC ENGINEERING CENTER DAVIS CA

Personal Author(s) : Hunt, John H. ; Brunner, Gary W.

PDF Url : ADA311054

Report Date : SEP 1995

Pagination or Media Count : 79

Abstract : Bridges across floodplains may require special attention in one-dimensional hydraulic modeling if they cause severe contraction and expansion of the flow. The accurate prediction of the energy losses in the contraction reach upstream of the bridge and the expansion reach downstream of the bridge using one-dimensional models presents particular difficulty. Modeling these reaches requires the accurate evaluation of four parameters: the expansion reach length, L; the contraction reach length, L; the expansion coefficient, Co; and the contraction coefficient, Cc. This report presents research conducted by the author to investigate these four parameters through the use of field data, two-dimensional hydraulic modeling, and one-dimensional modeling.

Descriptors :   *WATER FLOW, *HYDRAULICS, *BRIDGES, COMPUTER PROGRAMS, MATHEMATICAL MODELS, PARAMETERS, FINITE ELEMENT ANALYSIS, ACCURACY, EDDIES(FLUID MECHANICS), ENERGY TRANSFER, HYDROLOGY, REGRESSION ANALYSIS, FLOW FIELDS, PARTIAL DIFFERENTIAL EQUATIONS, EXPANSION, ELEVATION, BANKS(WATERWAYS), VISCOSITY, CHANNELS(WATERWAYS), STREAMFLOW ANALYSIS, CONTRACTION, DOWNSTREAM FLOW, FLOOD PLAINS, STEADY FLOW, GOODNESS OF FIT TESTS.

Subject Categories : Hydrology, Limnology and Potamology
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE