Evaluation Of An Air-Bubble Curtain To Reduce Impingement At An Electric Generating Station

A biological testing program was conducted during 1974·75 to determine the efficiency of an air·bubble curtain in reducing fish impingement at Arkansas Nuclear·One Unit I, on Dardanelle Reservoir, AR. Air curtain operation did not effectively deter fish from entering the intake canal or substantially reduce impingement. Seasonal varia· tions in species composition and length·frequency distribution of impinged fish were independent of air curtain operation. There was a significant inverse correlation between water temperature and impingement levels during fall 1974 and spring 1975. Highest impingement rates occurred during late fall, winter, and early spring, regardless of air curtain status. Impinged individuals were predominantly young-of-the·year-fish, especially threadfin (DoTOsoma petenense) and gizzard shad (D. cepedianum), assumed to be thermally stressed by low « 15.5 C) water temperatures.

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