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Numerical modeling of sediment flushing from Lewis and Clark Lake

International Journal of Sediment Research 2013年第2期28卷 182-193页

作者： Jungkyu AHN Chih Ted YANG Paul M.BOYD Daniel B.PRIDAL John I.REMUS Civil and Environmental Engineering Department Seoul National UniversitySeoulRepublic of Korea Research Fellow Water Resources and Director of Hydroscience and Training Center Civil and Environmental Engineering DepartmentColorado State UniversityFort CollinsCOUSA80526 Borland Professor U.S.Army Corps of Engineers OmahaNebraskaUSA Hydraulic Engineer Sedimentation and Channel Stabilization Section U.S.Army Corps of EngineersOmahaNebraskaUSA Chief

Lewis and Clark Lake is located on the main stream of the Missouri *** reservoir is formed behind Gavins Point dam near Yankton,South Dakota,*** Lewis and Clark Lake reach extends about 40 km from the Gavins Point *** reservoir delta has been growing since the closure of Gavins Point dam in 1955 and has resulted in a 21%reduction of storage within the maximum pool of the *** several sediment management methods,drawdown flushing has been recommended as a possible management *** engineering viability of removing sediments deposited in the lake should be examined by numerical modeling before implementing a drawdown ***4 was used for this study and calibrated by using measured data from 1975 to *** cross-section changes and amount of flushed sediment were predicted with four hypothetical flow *** flushing efficiencies of all scenarios were estimated by comparing the ratios between water consumption and flushed sediment during flushing.

关键词： Drawdown flushing flushing efficiency GSTARS computer model Reservoir sedimentation Sediment transport Lewis and Clark Lake

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PHENOMENA AND CONTROLLING FACTORS INDRAWDOWN flushing PROCESSES

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International Journal of Sediment Research 1999年第2期14卷 379-389页

作者： (Department of Hydraulic Engineering, Feng Chia University, Taichung 407, TAIWAN, China Environment Section, Agricultural Engineering Research Center, Chungli, TAIWAN, China Shaohua Marko HSU and Wei-Sheng YU)

Opposite to mechanical dredging by machine, hydraulic flushing or drawdown flushing is a technique utilizes the nature power of flow, by lowing the water level downstream, to excavate sediment deposit from either a reservoir or a settling basin. Flume experiments are performed and two phenomena are found significant in the processes of flushing. One is moving drop flow and the other. moving hydraulic jumps. Drop flow takes place at a point when water-level lowing occurs at the downstream of that point due to erosion of downstream sediment. Hydraulic jump following the drop flow is a transition from supercritical to subcritical flow condition. Together, the process of hydraulic flushing consists of a series of trans-critical drop flows (or cascade) along with moving scouring. Volume erosion ratio (VER) is defined as the percentage of accumulated volume eroded from original deposit. VER is plotted against time of operation for quantifying the efficiency of hydraulic flushing. Typical pattern of VER is a curve rapidly increase at the beginning and gradually become a constant as an equilibrium slope reached. Opening of sluice gate, slope of flume, and inflow discharge are three factors affecting the VER curve in terms of the final stage, but not the time required. According to the regression formula based on experimental data,weighting among three factors reveals that the most important factor is the opening of sluice gate, second the slope of flume, and inflow discharge is the least important *** optimal control, a best flushing rate can be obtained, which can be interpreted as saving of water volume for same sediment removal within an acceptable duration.

关键词： Settling basin Hydraulic flushing Drawdown flushing Retrogressive erosion. flushing process flushing efficiency Drop flow

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