Abstract: Since 2002, centralized water and sediment regulation was carried out during the period of above- flood- level water preflood discharge and clearing out the flood control storage capacity. Great deposit mitigation benefit was gotten from this. During the regulation of water and sediment, as result of large volume discharge and reservoir water level fell fast, dam deformation increased. It was of the characteristics that the horizontal displacement changed to the upstream and the vertical displacement settlement accelerated. Monitoring results showed that the water and sediment regulation would not affect the damsafety and operation.

摘要： 自2002 年以来, 小浪底水库汛前利用预泄汛限水位以上水量、腾空防洪库容的有利时机, 连续5 年进行集中调水调沙, 获得了巨大的减淤效益。但在调水调沙期间, 由于大流量下泄, 水库水位下降较快, 大坝变形明显增大, 表现为水平位移向上游变化、垂直位移加速沉降变化的特点。监测分析结果表明, 调水调沙运用不影响大坝安全稳定运行。