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Long-Term Effect of Instream Habitat-Improvement Structures on Channel Morphology Along the Blackledge and Salmon Rivers, Connecticut, USA

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  • DOUGLAS M. THOMPSON

    (Department of Physics, Astronomy and Geophysics, Connecticut College, New London, Connecticut 06320, USA)

Abstract

Habitat-improvement structures on the Blackledge and Salmon rivers date back to the 1930s and 1950s. Forty of these structures were investigated to determine their long-term impact on channel morphology. These structures include designs that continue to be used in modern restoration efforts. During the intervening period since these structures were introduced, several major floods have affected the two channels. The floods include three flows in excess of the 50-year event, including the flood of record, which has an estimated recurrence interval of almost 300 years. Despite the extreme flooding, many structures were discovered in varying conditions of operation. Grade-control structures and low-flow deflectors generally create some low-flow habitat (P = 0.815) but do not produce the depth of water predicted by design manuals (P

Suggested Citation

  • Douglas M. Thompson, 2002. "Long-Term Effect of Instream Habitat-Improvement Structures on Channel Morphology Along the Blackledge and Salmon Rivers, Connecticut, USA," Environmental Management, Springer, vol. 29(2), pages 250-265, February.
    • Handle: RePEc:spr:envman:v:29:y:2002:i:2:d:10.1007_s00267-001-0069-0
    DOI: 10.1007/s00267-001-0069-0
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