南水北调中线工程调水后对汉江中下游河势的影响

Influence of Water Transfer Project fromSouth to North on middle and Lower reaches of Hanjiang River

利用不平衡输沙原理,对汉江中下游河道进行不同调水方案的冲淤计算及河势变化分析。计算成果表明:河道冲刷量调水145亿m3方案小于调水15亿m3方案;水位下降值调水145亿m3方案也较调水15亿m3方案的小。调水145亿m3后,下游水量减少,给汉江中下游河势、防洪、引水和航运带来一定的影响,须开辟其它水源或修建工程满足汉江中下游工农业生产及航运用水的需要。

The disequilibrium sediment transfer principle was utilized to calculate river erosion?deposition and to analyze river regime changes for the middle and lower reaches of the Hanjiang River for different water transfer schemes. The calculation results indicated that in aspect of river?reach erosion amount the diversion water 145×108 m3 scheme is less than that of 15×108 m3 scheme, and for the descents of water level, the former is smaller than the latter. Owing to water transfer 145×108 m3, the river regime, flood control and navigation will cause certain affections to the middle and lower reaches of the Hanjiang River, so a new water source must be developed to satisfy the demands of industry, agriculture, navigation and ecological environment for this region.