Application of SWAT-MODFLOW coupling model in groundwater balance analysis
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Abstract:
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.
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