小浪底水利枢纽的工程规模和综合运用方式

经对三门峡至秦厂河段开发方案比选,小浪底高坝方案,较好地满足防洪、防凌、减淤、供水、灌溉、发电的需要。对小浪底水库蓄水位265m、270m和275m的技术经济比较,各方案的防洪、灌溉和防凌效益相同,均可满足要求,但蓄水位275m方案的减淤效益最大。推荐275m方案为小浪底水库最高蓄水位,在经济上是合理的,技术上也是安全可行的。小浪底枢纽的运用首先是满足防洪、防凌、减淤的要求,相应进行供水、灌溉、发电。为了发挥水库减淤作用,采取在汛期逐步抬高水位的运用方式,多拦粗沙,提高对下游的减淤效果。10月至次年6月来水含沙量少,水库进行供水、灌溉、发电的蓄水调节。

Engineering Scale and Comprehensive Operational Mode of the Xiaolangdi Key Water Conservancy Project

Through comparison and selection of development scenarios for SanmenxiaQinchang Section, scenario of high dam for the Xiaolangdi Project can meet the requirements of flood control, ice run control, sediment reduction, water supply, irrigation and power generation. Through technical and economic comparison on the reservoir level of 265m, 270m and 275m, the benefits of flood control, irrigation and ice run control of each scenario are the same and all the requirements can be met, but the benefits of sediment reduction of eleva tion 275m scenario is the maximum. Therefore, the scenario of elevation 275m is recommended as the maximum reservoir level, which is reasonable in economy and safe and feasible in technology. The first priority of the Xiaolangdi project is given to flood control, ice run control and sediment reduction, then gives the consideration to water supply, irrigation and power generation. In order to play the function of sediment reduction of the reservoir, the reservoir level is raised gradually in the flood season for the purpose of keeping coarse sand as much as possible and increasing sediment reduction benefits of the lower reaches. During the period of October to the following June when the inflow has less sediment concentration, the reservoir is operated for water supply, irrigation and power generation.