南水北调中线工程丹江口水库泥沙冲淤计算

Sediment accumulation calculation on Danjiangkou Reservoirfor Water Transfer Project from South to North

利用一维不平衡输沙原理对丹江口水库大坝加高后,水库正常蓄水位抬高至170m运行时的库区泥沙冲淤进行了计算分析。计算成果表明:当枢纽运行至100a末时,汉江干流库区淤积量为36.34亿t,当枢纽运用至20a末,遇不同频率洪水时,受库区泥沙淤积的影响,在距坝190km以下的河段水位有所抬高,距坝190km以上的河段水位不受泥沙淤积的影响。

The sediment accumulation calculation on Danjiangkou Reservoir after the dam being heightened was performed by one dimensional unequilibrium sediment transmission principle under the condition of the reservoir water level being raised to 170 m. The calculation results indicate that:when the reservoir will be operated 100 years,the sediment accummulation amount will be 36.34×108 t;when the project will be operated by the end of 20 years with different frequencies of flood,the water level within reach 190 km apart from the dam will be raised to some extent due to the influence of reservoir sedimentation, but that upstream this reach will be not affected.