刘家峡水库对水沙变异影响分析

利用刘家峡水库运行前后进出库控制站的水文资料,对水库运行以来的径流泥沙特征进行了分析。研究表明:(1)水库运行对进出库年径流量影响很小,对年内分配影响大;(2)单库运行期水库蓄水拦沙,出库洪峰流量削减,年内径流量分配发生变化,泥沙量大幅度减少;(3)龙羊峡水库运行后的联合运行期,洪峰流量略有削减,年内蓄水过程改变后仍有一定的拦沙作用,出库含沙量较单库运行期增加;(4)水库运行减小了出库含沙量,并没有改变出库含沙量与入库含沙量的线性关系。

Analysis on impact of Liujiaxia Reservoir on variation of water and sediment

Based on the hydrologic data from the inflow and outflow control stations before and after the operation of Liujiaxia Reservoir，the sediment characteristics of the runoff since the operation of the reservoir is analyzed herein. The study shows that:（1）less impact is there from the operation of the reservoir on the annual runoff of the inflow and the outflow；（2）during the single reservoir operation for water storage and sediment retention，the outflow flood peak discharge is clipped，the distribution of the runoff within a year changes and the sediment is largely reduced；（3）during the joint operation since Longyangxia Reservoir putting into operation，the flood peak discharge is slightly clipped，the water storage process within a year changes and still has a certain effect of sediment retention，furthermore，the sediment content is increased，if compared with that of the single reservoir operation；（4）the reservoir operation reduces the sediment content of the outflow，but does not change the linear relationship between the sediment contents of both the outflow and the inflow.