自然界所有水资源都与水循环过程紧密地联系着。因此,了解大气降水、地表水和地下水(以下简称“三水”)的转化关系,对于正确评价水资源总量无疑地具有十分重要的意义。一、“三水”转化关系的特点1.岩溶地区“三水”转化的特点(1)地下水与地表水的反复转化使得其界限比较模糊。例如从地下河系流入河道中的水,在其出流处算是地下径流,而在其下游此一部分地下水很可能被划入地表径流 All water resources in nature are closely linked to the water cycle. Therefore, understanding the relationship between atmospheric precipitation, surface water and groundwater (hereinafter referred to as “Sanshui”) is undoubtedly of great significance for the correct assessment of the total amount of water resources. First, “Sanshui ” characteristics of the conversion relationship 1. Karst region “Sanshui ” characteristics of the conversion (1) The repeated conversion of groundwater and surface water makes its boundaries more vague. For example, water flowing into a channel from an underground river system may be considered as an underground runoff at its outflow, and this portion of groundwater downstream of the river may well be classified as surface runoff