Fish Passage Pool Bedding Analysis

by Louis S. Coletta,



Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water

Abstract: Anadromous fish passages, stream dynamics and the artifical channel segmented into a natural stream should fttnction seamlessly. This paper intends to develop reasonable procedures a designer can follow to determine the bedding material, pool profiles and lengths needed for the design of a dynamically stable channel bedding which can also be used in a fish passage. Utilizing the Tractive Force Theory, substituting the channel velocity from an analysis for Vp, and solving for permissible shear factor, τp, yields τp = 61.82RhS. Utilizing the Incipient Motion Sizing Equation, for gravel channels, Dc = τ/ [0.03 (γsediment-γw)] and Dc = τ/[0.047 (γsediment-γw)] for sand, the critical diameter, Dc, for any given stream channel can be found. By substitution where 2.55 γw = γsediment then, Dc = 21.3 RhS for local pool gravel bedding and Dc = 13.6 RhS for local pool sand bedding.

Subject Headings: Stream channels | Fish management | Hydraulic design | Equations of motion | Gravels | Sand (hydraulic) | Sandy soils | Channel stabilization

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