疏勒河流域昌马灌区地下水资源数值模拟

Numerical Modeling of the Changing Tendency of Groundwater in Changma Irrigation Area in the Shule River Valley

应用有限差分方法,采用不规则多边形剖分,对昌马冲洪积扇区地下水资源数量的变化趋势进行了模拟计算。结果表明,该灌区地下水的补给,将由现状以河水入渗补给为主变为以农灌水入渗补给为主,主要补给区由南部洪积扇区移至北部细土平原区;天然排泄量减少,人工排泄占有重要地位,地下水排泄的重心也和补给一样向北迁移;地下水均衡状况将由现状的基本均衡变为负均衡,年均收支逆差2 288亿m3;地下水位总体持续下降,局部略有上升。

The paper predicts the changing tendency of groundwater resource in Changma alluvial fan by numerical modeling,applying the method of finite difference and irregular polygon cells.The modeling results show that:1) the natural recharge of groundwater will decrease significantly,and the recharge area will move towards north;2) the natural discharge will decrease and the artificial discharge will play an important role;3) there is no equilibrium between recharge and discharge,and the groundwater reserve will be consumed gradually;4) the overall groundwater level will drop,but the ones at the places along the river will rise.