渭干河流域三维地下水流数值模拟

在新疆首次采用六层含水系统的三维地下水流数值模拟，对渭干河流域地下水资源进行评价．同时．在处理混合井流和混合观测孔时，采用“渗流一管流耦合模型”；在处理河流入渗和降雨入渗方面采用了“入渗滞后补给法”；处理潜水蒸发方面，采用了非线性关系来刻画潜水蒸发强度和潜水位埋深的关系．用“参数迭代法”来确定水头未知的含水层的初始水头，提高了模型的仿真性及对地下水资源评价的精度．

THREE-DIMENSIONAL DIGITAL SIMULATING OF GROUNDWATER FLOW OF WEIGAN RIVER DRAINAGE AREA

The groundwater resources in Weigan River drainage area was evaluated using digital simulating method of three-dimensional groundwater flow with six-aquifer system. Data from hybrid well and hybrid observation borehole was processed using the model of "filtration-conduit flow coupling". Data from the infiltrating of rivers and mefeoric water was processed using "filtration-lagging-supplying method". Data from the evaporation of ground water was processed using nonlinear correlation depicting the relation between evaporative intensity of ground water and the buried depth of groundwater. The initial hydraulic head of unknown aquifers determined by "initial hydraulic head-parameter iteration method" enhanced the simulation of the model and uplifted the precision of evaluating groundwater resources.