灌区地表水—地下水耦合模型的构建

为了定量描述灌区水平衡要素及其转化关系,构建了灌区地表水-地下水分布式模拟耦合模型。通过改进SWAT模型的稻田及旱作物水分循环、蒸发蒸腾量和渠系渗漏计算等模块,建立了灌区地表水分布式模拟模型;以SWAT模型中的水文响应单元(HRU)和MODFLOW模型中的有限差分网格(cells)作为基本交换单元,将改进SWAT模型的地下水补给量计算值加载到MODFLOW模型的地下水补给模块,实现了灌区地表水-地下水分布式模拟模型的耦合。耦合模型在柳园口灌区的应用结果表明,该模型能够准确模拟和预测灌区地表水和地下水的动态变化,为灌区水管理提供了科学依据。

Construction of integrated surface water and groundwater model for irrigation area

In order to quantitatively describe water balance factors and its conversion relation in irrigation area, an integrated surface water and groundwater model for irrigation area has been constructed. The water movement module of rice and upland crops, evapotranspiration and canal system seepage calculation module were improved to establish the distributed surface water model for irrigation area. The hydrologic response units (HRUs) in the SWAT model were exchanged with cells in the MODFLOW model. The distributed groundwater recharge rate of improved SWAT model was imported into the groundwater recharge module of the MODFLOW model. So the integrated surface water and groundwater model for irrigation area is constructed. The integrated model was tested in Liuyuankou Irrigation System. The results show that it could accurately simulate and predict the change of surface water and groundwater. It provides scientific basis for water management in irrigation area.