Local Scour at Fish Rocksby Andrew C. Fisher, Oregon State Univ, Corvallis, OR, USA,
Peter C. Klingeman, Oregon State Univ, Corvallis, OR, USA,
Abstract: There is a growing interest in the enhancement of rearing habitat for juvenile anadromous fish in the Pacific Northwest. This has focused attention on the need for a better understanding of the local scour process induced by instream structures. Large boulders, known as fish rocks, have been used individually or in groups as habitat structures. Flume studies, field experiments and field observations show that individual large boulders (fish rocks) initially placed on a flat bed will develop horseshoe-wake scour patterns. Relationships between hydraulic variables, fish rock characteristics and resultant scour quantities have been tentatively identified for fish rocks placed on coarse sand in uniform flow conditions.
Subject Headings: Fish management | Scour | Rocks | Field tests | Fluid flow | Hydraulic models | Boulders | Hydraulic structures | Pacific Northwest | North America | United States
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