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Sediment Transport in the Lower Snake and Clearwater River Basins, Idaho and Washington, 2008-11.
| 题名： | Sediment Transport in the Lower Snake and Clearwater River Basins, Idaho and Washington, 2008-11. |
| 作者： | Clark, G. M.; Fosness, R. L.; Wood, M. S. |
| 关键词： | Basins; Bedload; Clearwater River Basin; Data Collection; Idaho; Lower Snake Basin; Reservoirs; River Basins; Sediment Transport; Sedimentation; Streamflow; Suspended Sediment; Washington(state) |
| 摘要： | Sedimentation is an ongoing maintenance problem for reservoirs, limiting reservoir storage capacity and navigation. Because Lower Granite Reservoir in Washington is the most upstream of the four U.S. Army Corps of Engineers reservoirs on the lower Snake River, it receives and retains the largest amount of sediment. In 2008, in cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey began a study to quantify sediment transport to Lower Granite Reservoir. Samples of suspended sediment and bedload were collected from streamgaging stations on the Snake River near Anatone, Washington, and the Clearwater River at Spalding, Idaho. Both streamgages were equipped with an acoustic Doppler velocity meter to evaluate the efficacy of acoustic backscatter for estimating suspended-sediment concentrations and transport. In 2009, sediment sampling was extended to 10 additional locations in tributary watersheds to help identify the dominant source areas for sediment delivery to Lower Granite Reservoir. Suspended-sediment samples were collected 915 times per year at each location to encompass a range of streamflow conditions and to capture significant hydrologic events such as peak snowmelt runoff and rain-on-snow. Bedload samples were collected at a subset of stations where the stream conditions were conducive for sampling, and when streamflow was sufficiently high for bedload transport. |
| 报告类型： | 科技报告 |
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