巴谢河中游那勒寺灌区环境水文地质影响预测评价

Prediction and Evaluation of the Influence on Environmental Hydrogeology in Nalesi Irrigation District of Baxiehe River Basin

采用水文地质学的数值法，对南阳渠灌溉工程实施后巴谢河河谷那勒寺灌区地下水位的变化及由其产生的环境水文地质问题进行了预测评价．结果表明，地下水流的数学模型及其边界条件概化正确，参数选取合理，预测精度较高．对实际生产问题有一定的指导作用．

The Nalesi irrigated area will be up to 1.33×10 3 hm 2 in Baxiehe river basin when Nanyangqu irrigation project is put into practice. There will be 0.8×10 6 m 3 field irrigation water infiltrating ground more than ever before. As a result, groundwater will increase and water table will go up. Consequently, the hydrogeologic environment will be changed and a lot of environmental problems may arise. With the help of numerical method of hydrogeology, the change of groundwater table and its influence on environmental hydrogeology are predicted and evaluated. The result shows that salinization and water logging will occur in the first terrace and river floodplain after 2～6 years with the irrigation project put into practice. On the other hand, water table of simulation is almost the same as that of observation. Mean error is very small. Therefore, the mathematical model of ground water flow and the simplification of its boundary condition are right, the parameters are selected reasonably and prediction precision is quite high. All these will help to deal with the practical problems.