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水均衡法是一种集总参数方法,地下水均衡要素难于准确预测,导致水均衡法计算结果误差很大,无法满足城市下垫面快速变化下的地下水资源评价与管理的需要。本文提出的基于土地利用类型的水均衡方法以下垫面为研究对象,通过为每种土地利用类型建立相应的水量平衡方程式,间接地计算出地下水补给量。基于2000年北京平原区的土地利用资料,预测多年平均降雨量条件下平原区地下水垂向总补给量为17.4亿m3。
The water balance method is a lumped parameter method. It is difficult to accurately predict the equilibrium elements of groundwater, resulting in a large error in the calculation results of the water balance method, which can not meet the needs of groundwater resources evaluation and management under rapid changes of urban underlying surface. In this paper, the following water surface equalization method based on land-use type is taken as the research object. The groundwater recharge amount is calculated indirectly by establishing corresponding water balance equation for each land use type. Based on the land use data of Beijing Plain in 2000, it is predicted that the vertical groundwater recharge in the plain will be 1.74 billion m3 under the condition of multi-year average rainfall.