Channel Restoration of Incising, Mixed Grain Size Streams: Lessons Learned

by F. D. Shields, Jr., (M.ASCE),
M. W. Doyle,
S. S. Knight,
C. M. Cooper,

Document Type: Proceeding Paper

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


Aquatic habitat restoration in incising sand and gravel bed streams disturbed by channelization and other human interventions has received little study. These channel systems are characterized by sharply peaked hydrographs, high sediment loads (suspended yields ~10? metric tons km-2 yr-1), and temporally unstable, disorganized physical habitats. Bed material size rarely varies predictably in the vertical (consistent armor layers are absent) or the horizontal (pool-riffle sequences are absent or poorly formed). This paper presents selected results of a five year study. Two 1 km long reaches were treated with stone structures and vegetation, while two nearby similarly degraded sites and one lightly degraded site were not modified. Physical, chemical, and biological properties were sampled at all sites for five years (1991?1995). Subsequent papers will present additional information regarding channel response, macroinvertebrates, and bed material.

Subject Headings: Bed materials | Ecological restoration | Stream channels | Channels (waterway) | Suspended sediment | Suspended loads | Rivers and streams

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