宁夏引黄灌区井渠双灌节水效益分析

Analysis of the water-saving benefit by well-channel irrigation in the Yellow River irrigation district in Ningxia

宁夏引黄灌区是重要的粮食生产基地,其农业耗水占据了绝大部分引黄耗水量。本文在以引黄水量为主要灌溉水源、适量采用开采地下水作为补充的基础上,对整个灌区采用地表水与地下水联合灌溉的节水效益进行了定量研究。结果表明,采用井渠双灌现状年引黄灌区十县市可减少渠首引水量1.53×108m3,减少损失水量将达到0.68×108m3。对2010年的预测结果表明,可减少田间引黄灌溉用水量1.95×108m3,减少渠首引黄水量为3.48×108m3,减少输水过程中的损失水量为1.54×108m3,具有显著的节水效益。

The Yellow River irrigation districtin Ningxia is one of the most important grain pro- duction bases, water consumption in agricultrue has occupied the most amount of the water di- verted from the Yellow River in Ningxia. Based on the water quantity diverted from Yellow river was the main irrigation water source and groundwater as addition sources, this paper carried out the quantitative research for the water-saving benefit by well-channe irrigation in whole irrigation district. The results shown that using well-channel irrigation in 10 counties in Yellow River irri- gation district can be effectively reduced intake water form Yellow River by 1.53 X 10^8 m^3 as well as decreased water losses about 0.68X10^8 m^3 at the present year. The prediction results to 2010 have shown that the irrigation water use in the field from the Yellow River can be reduced about 1.95 X 10^8 m^3, canal head water about 3.48 X 10^8 m^3 and decreased the water loss in delivery process by 1.54X10^8 m^3, which has remarkable water-saving effects.