三峡工程对改善长江口咸潮入侵情势的分析

Function of Three Gorges Project against Salty-tide Invasion in Yangtze Mouth

长江口地区是当前我国社会经济发展最快的区域之一 ,但社会经济的高速发展却受到了咸潮入侵的制约。三峡工程兴建后 ,长江干流上有了对长江径流调控的重要手段。分析表明 ,三峡工程建成后 ,10月份水库蓄水将使咸潮入侵略有提前 ,但由于此时盐度本底值较低 ,故影响不大 ;而长江枯水的 1～ 3月份 ,由于三峡水电站发电加大泄水 ,将十分有利于抑制咸潮入侵。适当改变三峡水库调度方式 ,让三峡工程提前蓄一些水 ,并在长江最枯水期多下泄一些水量 。

The area of Yangtze River mouth is one of the most developed ones in China, but the high-speed social and economic development is somehow reined by the Salty-tide invasion. The construction of Three Gorges project will bring us an effective method to control the flow of water in the River. Analyses indicate that some improvement in water regulation, such as properly early storage of water, and more drainage in drought period, will wield more function of Three Gorges against the salty-tide invasion of Yangtze mouth.