利用地下水-地表水半松散耦合数值模拟方法, 选取北京市苏密怀地区为典型地区, 以长时间序列 SWAT 模型获取的平原区地下水补给量和山区对平原区地下水补给量作为传递变量, 分别代替 MODFLOW 模型中降雨入 渗补给量和山前侧向补给量的研究思路, 建立半松散式 SWAT2MODFLOW 耦合模型, 利用地下水位校验耦合模型 并对苏密怀地区地下水水量平衡进行分析。结果表明: 该方法可以提高地下水模型的精度, 耦合模型较传统算法计 算得到的降雨入渗补给量减少了 01 54 亿 m3 / a, 反映出当下垫面条件发生变化和包气带厚度增加时, 含水层的降水补给量减少。本研究为水资源的准确评价提供技术支持。

Using the semi-loose coupling numerical simulation method of groundwater and surfacewater, the Su-Mi-Huai area of Beijing is selected, and the groundwater recharge in the plain was taken and the groundwater recharge in the mountain area was obtained from the long time series SWAT model as transfer variables to replace the research ideas of rainfall infiltration supply and mounta in front lateral supply in MODFLOW model, and the semi-loose SWAT-MODFLOW coupling model was established to verify the coupling model of groundwater level and the groundwater balance in Su-Mi-Huai area was analyed. The results showed that this method could improve the accuracy of the groundwat er model, and the rainfall infiltration recharge calculated by the coupled model that was reduced by 0.54×10 8 m3 / a when compared w ith the traditional method. This reflected that with the increase of underlying surface conditions and the thickness of the vadose zone, the rainfall recharge of the aquifer was decreased. This study may provide technical support for the accurate evaluation of water resour ces.

( 1. 中国地质大学( 北京) 水资源与环境学院, 北京 100083; 2. 北京市地热研究院, 北京 102218; 3. 北京市水文总站, 北京 100089)