SWAT模型与MODFLOW模型的耦合计算及应用

为了准确模拟区域地下水动态变化,将地表水SWAT模型与地下水MODFLOW模型进行耦合计算。根据SWAT分布式模型的特点,以其水文响应单元(HRU)和MODFLOW模型的有限差分网格(cell)作为基本交换单元,将SWAT模型计算的地下水补给量和潜水蒸发量引入MODFLOW模型的地下水补给(RCH)模块和潜水蒸发(EVT)模块中,并将其应用于徐州市张集地区的地下水模拟计算。结果表明,SWAT模型与MODFLOW模型的耦合计算能准确模拟和预测该地区的地下水水情及其地表水和地下水之间的相互作用。

A coupled model simulation and application of SWAT-MODFLOW

In order to simulate change in regional groundwater,the quasi-distributed watershed model,SWAT was coupled with the fully-distributed groundwater model MODFLOW,in simulation.The hydrologic response units（HRU） in the SWAT model,its basic elements,were exchanged with cells in the MODFLOW model.By using the HRU—cell conversion interface,the distributed groundwater recharge rate and the groundwater evapotranspiration calculated by SWAT were introduced into the RCH and EVT modules of MODFLOW.The application of groundwater simulation in the Zhangji area of Xuzhou demonstrated that the coupled SWAT-MODFLOW was capable of predicting the groundwater situation,and of being used for investigating the interaction between surface water and groundwater.