煤矿开采区地表水-地下水耦合模拟

Integrated simulation of surface water and groundwater in a high intensive coal mining area

为定量评价煤炭资源大规模开发,下垫面条件改变导致的水平衡要素及地表水与地下水转化关系的改变,急需开展煤矿开采区地表水水文过程和地下水动力过程耦合模拟研究。在考虑地表水入渗补给的滞后性和在RCH程序内部实现垂向上对多层单元格补给表达的基础上,构建基于分布式水文模型(SWAT)和模块化地下水动力模型(MODFLOW)的耦合数值模型(SWATMOD),并将该模型应用于秃尾河流域——锦界煤矿采煤工程实例中。实例应用表明:耦合模型能较准确地模拟地表水水文过程和地下水动力过程及地下水动态变化过程,可用于预测秃尾河流域煤矿开采区地表水和地下水转化规律的改变。

To quantitatively evaluate the changes of water balance elements and interaction relationship between surface water and groundwater,which are altered by coal resource exploitation on a large scale and underlying surface variation. It is urgently required to carry out the research on an integrated simulation between surface hydrology process and groundwater dynamic process in coal mining area. Considering the hysteresis property of infiltration from surface water sources,and with the RCH subroutine the area recharge and discharge occurring in all layers,based on the distributed SWAT hydrological model and modular groundwater dynamic model( MODFLOW),a numerical integrated model( SWATMOD) was developed. This integrated simulation model was applied in Jinjie coal mining area. The results show that the integrated model can accurately simulate the surface hydrology process,the groundwater dynamic process and the process of dynamic changes of groundwater. It can be used to predict the regularities of the interaction between surface water and groundwater in coal mining areas at Tuwei River Basin.