The Effects of Hydropower Releases from Lake Texoma on Downstream Water Quality
作者:
StevenL. Ashby,
JohnL. Myers,
Everett Laney,
David Honnell,
Chetta Owens,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 1999)
卷期:
Volume 14,
issue 1
页码: 103-112
ISSN:0270-5060
年代: 1999
DOI:10.1080/02705060.1999.9663659
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Impacts of peaking generation on water quality in the tailwater of Lake Texoma, on the Texas and Oklahoma border, were evaluated during summer stratification in the lake. Sampling was conducted before, during, and after a daily generation cycle with measurements of temperature, dissolved oxygen, iron, manganese, and turbidity. Temperatures were near 25°C during generation, fluctuated 3–4°C during nongeneration, and increased in a downstream direction to near 28°C. Dissolved oxygen concentrations were between 4 and 6 mg L−1during generation and increased in a downstream direction. During nongeneration, concentrations in the upstream regon of the tailwater were near 2 mg L−1but were between 4 and 10 mg L−1in the rest of the study area. Maximum concentrations, 6 to 10 mg L−1, were observed prior to the hydrograph peak at each station, suggesting leading edge effects of increased flow and aeration as substrate was covered during river stage increases. Concentrations of metals increased in a downstream direction coincident with turbidity increases from near 3 to 25 NTUs, suggesting resuspension and possibly flocculation. Dissimilar patterns were observed for nongeneration when concentrations decreased in a downstream direction while turbidity was relatively constant and lower than generation values, suggesting settling with decreased flow.
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