Resisted Lateral Scour in Streams - Its Special Importance to Salmonid Habitat and Management
Fisheries Bioengineering Symposium: American Fisheries Society Symposium 10
Colt J;White RJ;
American Fisheries Society
Various kinds of salmonid fishes benefit where lateral scour forces in streams are opposed by relatively rough and erosion-resistant channel walls. The resisted lateral scour forms zones of high shear stress of current (often pools) against streambanks in association with undercut banks, large bankside rocks, and accumulations of large woody debris. This juxtaposition of flow patterns and channel shapes often puts the main drift of food close to prime concealment cover, which is advantageous for drift feeders. Such situations may be especially important for stream-resident trout, as well as for various anadromous salmonids. Development and maintenance of the lateral scour pools and related features usually depend on the binding and roughening of banks by abundant riparian vegetation. In protecting, restoring, and enhancing stream habitat for salmonids, resisted lateral scour situations warrant special attention.