Direct Effects of Differential Spill Volumes on Mortality and Injury Rates of Juvenile Salmonids at The Dalles Dam Spillway, Columbia River in Fall 2002 and Spring 2003 PDF Download
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Author: John Raymond Skalski
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages :
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Author: John Raymond Skalski
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages :
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Author: United States. Army. Corps of Engineers. Portland District
Publisher:
ISBN:
Category : Dalles Dam (Or. and Wash.)
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Dams
Languages : en
Pages : 198
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Author: United States
Publisher:
ISBN: 9780160521744
Category : Nature
Languages : en
Pages : 240
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Author:
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Category :
Languages : en
Pages :
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The objective of this study was to determine detailed vertical, horizontal, intensive, and diel distributions of juvenile salmonid passage at the spillway at The Dalles Dam from April 12 to July16, 2006. These data are being applied in the Spillway Improvements Program to position release pipes for direct injury and mortality studies and to provide baseline data for assessment of the vortex suppression devices scheduled for deployment in 2007. We estimated fish distributions from hydroacoustic data collected with split-beam transducers arrayed across Bays 1 through 9 and 14. Spill at ~20 kcfs per bay was bulked at Bays 1-6, although the other bays were opened at times during the study to maintain a 40% spill percentage out of total project discharge. The vertical distribution of fish was skewed toward the surface during spring, but during summer, passage peaked at 2-3 m above the spillway ogee. Fish passage rates (number per hour) and fish densities (number per kcfs) were highest at Bay 6, followed by passage at Bay 5. This result comports with spillway horizontal distribution data from radio telemetry and hydroacoustic studies in 2004. The vertical and horizontal distribution of fish passage at bays 5 and 6 was much more variable during spring than summer and more variable at bay 5 than bay 6. Diel distribution data revealed that fish passage was highest during 0600-0700 h in spring; otherwise passage was reasonably uniform on a diel basis. This study substantiates the purpose of the spillway vortex suppression device to re-distribute downstream migrants away from Bay 6 toward Bays 1-5.
Author: U.S. Department of the Interior
Publisher: CreateSpace
ISBN: 9781497368965
Category : Reference
Languages : en
Pages : 74
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As juvenile salmon Oncorhynchus spp. and steelhead O. mykiss migrate downriver to the ocean, they are subject to natural and human-induced mortality. Predators contribute to total natural mortality along with other factors.
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Category :
Languages : en
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