American Society of Civil Engineers


Problems with Numerical Modeling of Gravel-Bed Rivers


by Ronald R. Copeland, (US Army Engineer Waterways, Experiment Station, Vicksburg, United States) and William A. Thomas, (US Army Engineer Waterways, Experiment Station, Vicksburg, United States)

pp. 1001-1006

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Document type: Conference Proceeding Paper
Part of: Hydraulic Engineering
Abstract: Inherent to one-dimensional numerical models are the assumptions that hydraulic parameters can be assigned a characteristic average value, and that the flow is gradually varied so that the equations of motion can be applied between designated cross sections. The difficulty with gravel-bed streams begins with their lack of uniformity both in the lateral and longitudinal directions. Another problem is the lack of a generally applicable sediment transport function, and the collection of field data to verify a sediment transport function ranges from difficult to impossible. As a result, more careful attention to numerical model input must be exercised, and more judgment must be applied when interpreting calculated results.


ASCE Subject Headings:
Bed materials
Gravel
Numerical models
Sediment transport
Cross sections
Data collection

Author Keywords:
Rivers
Channel flow - Equations of motion - Flow of water - Gravel - Hydraulic models - Mathematical models - Sediment transport - Stream flow - Underwater soils
Gravel bed rivers