Effects of Reservoir Drawdown on Resuspension of Deltaic Sediments in Lake Powell

Autor:	William S. Vernieu
Rok vydání:	1997
Předmět:	Canyon Hydrology geography geography.geographical_feature_category Aquatic ecosystem Trace element Drainage basin Aquatic Science Sedimentation Productivity (ecology) Tributary Drawdown (hydrology) Environmental science Water Science and Technology
Zdroj:	Lake and Reservoir Management. 13:67-78
ISSN:	2151-5530 1040-2381
DOI:	10.1080/07438149709354298
Popis:	Due to prolonged drought conditions in the Upper Colorado River Basin, Lake Powell's water surface elevation declined steadily from 1988 to an early 1993 level approximately 27 m below the full pool level of 1130 m above MSL, resulting in a 60% reduction in reservoir storage. Associated with this drawdown was the exposure and resuspension of over 100 channel kilometers of deltaic deposits in the combined major tributary arms of the reservoir. This resuspension process maybe a significant source of nutrient and trace element loading to the reservoir due to the release of substances associated with these sediments. This may have implications to productivity processes and bioaccumulation of heavy metals in the aquatic ecosystem. In this study, 11 sites on the Colorado River and 3 sites in Dark Canyon, a small tributary in the inflow area of Lake Powell, were sampled for sediment concentration and size fractionation, nutrient concentrations, and total and dissolved trace element concentrations. Resul...
Databáze:	OpenAIRE
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