三门峡水库运用对库区冲淤影响的研究

根据实测资料计算和分析，非汛期水库回水淤积末湍距坝距离l1与非汛期水库最高运用水位和初始始河床平均高程交点距坝距离l2之比平均为1．07左右；水库汛期溯源冲刷输沙率与流量和坝前比降成正比，溯源冲刷范围一般在和大禹渡之间；水库近几年的排沙流量一般在1500－2500m^3/s之间，水库降低水位应控制在292－295m范围内，9、10月水库蓄水发电运用水位可适当提高，控制指标是以不影响大渡附近河段的冲刷为前提。建议在北村至大禹渡之间增设一个水位站作为水库新的控制指标站，并开展水库不同水位对该站以上河段冲淤影响的研究。

Study on Influence of Sanmenxia Reservoir Operation on its Erosion and Deposition

Based on the analysis and calculation of observed data, the ratio of L\-1 (distance between the end of reservoir deposition in non\|flood season and the dam) to L\-2 (distance between an intersection point of reservoir operation\'s highest level and average elevation line in initial bed in non\|flood season and the dam) is 1.07. In flood season, sediment discharge of reservoir retrogressive erosion is proportional to discharge and water surface slope before the dam, its rang is between Guduo and Dayudu. The amounts of discharging sediment are between 1500m 3/s and 2500m 3/s in recent years, lowering water level in reservoir should be controlled between 292m and 295m. Water level of storing water for generation in September and October can be raised suitably, the scouring near Dayudu reach is not affected by control index. It is suggested that a gauging station should be set up as new control index one and an effect at different levels of reservoir on erosion and deposition upstream of this station should be studied.