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Research Reports

Equilibrium Geomorphologic Conditions for High Gradient Bed Streams

Description: The goal of this study was to identify the flow conditions under which stable bedforms exist; provide the geometric characteristics of these bedforms; measure the magnitude of the streamwise velocity and energy dissipation factor; and determine the friction factor under various flow conditions and gravel sizes. Design criteria and recommendations for stable bedforms were provided upon the termination of this research. Stable bedforms are defined as those bedforms of which the spatial characteristics (height and spacing) do not change with time. The focus of this study was on streams with slopes greater than 3%, as clear design requirements for bed geomorphologic stability are lacking for these cases, and they are of particular interest in the design and retrofit of culverts for both anadromous and resident migratory fish passage.

  • Date Published: January, 2000
  • Publication Number: WA-RD 479.1
  • Last Modified: May 17, 2007
  • Authors: A.N. Thanos Papanicolaou, Adam R. Maxwell.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 65 p., 1,558 KB (PDF)
  • Subject: Culverts, Design, Fishes, Flow, Friction factor, Geometry, Geomorphology, Gravel, Retrofitting, Size, Stability (Mechanics), Streambeds, Streams, Velocity.
  • Keywords: Step-pools geomorphologic characteristics, frictional characteristics, bed failure conditions, hydraulics characteristics for high gradients bed streams.
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This abstract was last modified April 29, 2008