抽引江水与抽排涝水时江都抽水站流量变化

为探究近年来河道水草滋生对泵站流量的影响,基于建站以来江都抽水泵站运行的实测资料,分析了主汛期间4座泵站流量的变化情况。结果表明:①1983年前,抽引江水与抽排涝水时4座泵站流量均不受影响,各站水位流量关系均为稳定的单一线;1987年开始,抽排涝水时间较长时流量总体偏小,抽引江水与抽排涝水时各站的水位流量关系需要分别定线推流。②抽引江水时,水草杂物对4座泵站流量影响的程度基本一致;抽排里下河涝水时,四站临近河口且机组流量最大,流量减小的幅度为4座泵站中最大。③近年来抽引江水运行时间越长,流量减小程度越大,但小于抽排涝水时的影响。研究结果对防汛抗旱、工程安全运用和水资源合理调配具有重要的现实意义。

Discharge change in Jiangdu pumping stations during pumping period and drainage period

Water Control Project Administrative Office of Jiangsu Province, Yangzhou 225200, China)〖HS)〗 〖WT5”HZ〗Abstract:〓 〖WT5”BZ〗In order to understand how waterweed and the waste in rivers influence flow in pumping stations, we analyzed the discharge change in four pumping stations of Jiangdu water control project during main flood seasons according to the measured data from the pumping stations since its construction. The results showed that: (1) Before 1983, the discharges in four pumping stations were not affected. The relationships between water level and discharge of four pumping stations were stable. However, since 1987, the discharge decreased when the station pumping time was long. Hence, new water level-discharge relationship should be formulated respectively. (2)When pumping water from the Yangtze River, the waterweed and waste in rivers had the same influence on the discharges in four pumping stations. However, when drainaging water from the Lixia River, the discharge of the fourth pumping station near the Xintongyang River mouth was the largest, whose reduction was the greatest among four pumping stations. (3) In recent years, the longer the operation time of pumping water from the Yangtze River was, the greater the reduction in discharge was, and the flow reductiong phenomena is more obvious when draining water from the Lixia river. These results are meaningful for flood control and drought relief, project safety operation of and water resources planning and management.