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本文从刘家峡水库洮河口以下坝前淤积形成沙坎的现状出发,对低水位运行时坝前水位随电站增荷而产生的大幅度下降问题,进行了深入的分析论证,指出刘家峡水库出现的问题实质上是一种明渠非恒定流。其定量的计算,可以根据实测的地形资料、运行水位以及水电站负荷变化的情况,建立数学模型进行计算。 本方法曾在“刘家峡水电站低水位运行时坝前水位骤降”研究报告中与模型试验、原型观测资料作对比,得到满意的结果。
Based on the present situation of sediment formation in the reservoir below Liuqiaxia reservoir before the dam formation, the paper analyzes the significant drop of the water level before the dam with the increase of the station load at low water level, and points out the problems in the Liujiaxia Reservoir In essence, it is a kind of open channel unsteady flow. The quantitative calculation can be based on the measured topographic data, operating water level and load changes in hydropower stations, the establishment of mathematical models for calculation. This method has been compared with the model test and the prototype observation data in the research report of “the water level drop at the dam before the Liujiaxia hydropower station operates at low water level” to obtain satisfactory results.