Stable Channels with Loose Boundary

by Panayiotis Diplas, Univ of Iowa, United States,



Document Type: Proceeding Paper

Part of: Soil Properties Evaluation from Centrifugal Models and Field Performance

Abstract:

Recently, G. Parker suggested that the lateral transport of downstream momentum due to Reynolds stresses should be included in the momentum balance used to calculate the boundary shear stress distribution. This new approach can reconcile the existence of a stable channel in the presence of sediment transport. The purpose of the study reported here was to utilize Parker's approach to develop regime relations for a straight channel with coarse material composing its perimeter and carrying bedload only in the absence of bedforms. This is a simplified model of a gravel bed river, where bedforms tend to be poorly developed. The shape of a stable channel cross section is examined. The results are compared with field and flume data for the cases of uniform and poorly sorted bed material.

Subject Headings: Shear stress | Sediment transport | Channel stabilization | Boundary shear | Stable channels | Bed materials | Stress distribution

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