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众所周知,地下水可恢复资源的多寡是与降水入渗补给量密切相关的。在基岩山区,计算降水入渗补给量和降水入渗补给系数比平原地区要困难得多。目前,我国多采用“割基流”法求山区的降水入渗量。根据淮河流域山区的资料,其数值多偏小,准确度较差。况且,此法求得的是区域平均值,不能区分不同的岩性、不同自然地理条件下的入渗情况,因此,有必要探讨更合适的方法。本文从研究基岩山区降水入渗的机制入手,介绍几种目前可行的计算方法。
It is well-known that the amount of recoverable resources in groundwater is closely related to the recharge of rainfall infiltration. In bedrock mountain areas, it is more difficult to calculate the recharge amount of precipitation infiltration and the infiltration recharge coefficient of rainfall than the plain area. At present, most of our country use “cutting base flow” method for precipitation infiltration in mountainous areas. According to the data of the Huaihe River Basin mountainous area, its numerical value is small and the accuracy is poor. Moreover, this method is the regional average, can not distinguish between different lithology, infiltration under different natural and geographical conditions, therefore, it is necessary to explore a more appropriate method. This paper starts with the study on the mechanism of rainfall infiltration in bedrock mountainous area, and introduces several available calculation methods.