On the stable geometry of self-formed alluvial channels: theory and practical applicationThis article is one of a selection of papers in this Special Issue in honour of Professor M. Selim Yalin (1925–2007).

Author:

Ferreira da Silva Ana Maria1

Affiliation:

1. Department of Civil Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada (email: ).

Abstract

On the basis of previous work by the late Professor M. Selim Yalin and the author, the process of self-formation of alluvial streams and the final (equilibrium or regime) geometry of the self-formed stream are considered in the light of thermodynamic principles, including the first and second laws, and the Gibb’s equation; the stream is treated as an isolated and irreversible system. The present analysis suggests that stream self-formation is guided by the need of the stream to progressively decrease its average flow velocity to accommodate the increase in the entropy of the system with the passage of time. The reduction in flow velocity is achieved by an appropriate alteration of stream slope, cross-sectional geometry, and effective roughness, the regime development being the process of this appropriate alteration. A method is presented for the computation of regime width, depth, and slope. The method rests on the channel formation criterion derived from thermodynamic principles and the expression of regime flow width determined on the basis of zero net cross sediment transport rate at the regime state. The regime channels computed from this method are compared with field and laboratory data from various sources.

Publisher

Canadian Science Publishing

Subject

General Environmental Science,Civil and Structural Engineering

Reference40 articles.

1. Experiments on Small Streams in Alluvium

2. Blench, T. 1966. Mobile-bed fluviology. University of Alberta, Edmonton, Alta.

3. Entropy-based design approach of threshold alluvial channels

4. Chang, H.H. 1988. Fluvial processes in river engineering. John Wiley and Sons. New York.

5. Stable Alluvial Canal Design

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