基于SWATMOD的井渠结合灌区水资源可利用量评价

针对井渠结合灌区水文过程以地表水的人工控制和抽取地下水灌溉—蒸散为主的水文循环特点,应用SWATMOD模型,以某渠灌区为例,对构建的耦合模型进行了率定和验证,并进行了灌区水资源量计算和水资源可利用量评价。模拟结果合理,丰富了井渠结合灌区水资源可利用量评价方法。

估算地下水补给量的新方法-SWATMOD耦合模型简介

近年来,随着经济社会的飞速发展,生产生活用水量的迅速增加导致供需矛盾增加,地下水资源也被过度开采。为了避免过度开采地下水资源而造成严重的环境问题和更好地可持续开发和利用地下水资源,我们需要更为准确的估算地下水补给量。地表水与地下水存在密切联系。为了更好的掌握地下水与地表水的资源情况,地表水与地下水的耦合就十分重要。因此,SWATMOD耦合模型便应运而生,它是一种将地表与包气带水文过程与地下水流过程有机的结合在一起考虑的模型,能够提高地下水补给量估算的精确度。

煤矿开采区地表水-地下水耦合模拟

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。

Two-way coupling of unsaturated-saturated flow by integrating the SWAT and MODFLOW models with application in an irrigation district in arid region of West China

This paper presents the realization of two-way coupling of the unsaturated-saturated flow interactions of the SWAT2000 and MODFLOW96 models on the basis of the integrated surface/groundwater model SWATMOD99, and its application in Hetao Irrigation District （HID）, Inner Mongolia, China. Major revisions and enhancements were made to the SWAT2000 and MODFLOW models for simulating the detailed hydrologic budget and coupled unsaturated and saturated interactions, and irrigation canal hydrology for the HID. The simulation results of seasonal groundwater recharge to and evaporate from the shallow groundwater, and the annual water budget over the district are presented and discussed. The results implied the necessity of two-way coupling of the unsaturated-saturated interactions when groundwater is shallow, and the feasibility of making comprehensive use of the information coming from both the surface water and groundwater models to make a more physically-based assessment of the coupled interactions.