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文章利用ArcGIS软件提取重庆市1∶20万水文地质图信息,统计出重庆市地下河约380条,总长度约为1 898.43km,多年平均流量约144.20m3/s,水资源量约45.47×108m3/a。总的来说,重庆市地下河主要分布在渝东北、东南地区,其分布范围和重庆市碳酸盐岩分布范围一致。同时利用地下河发育密度和多年平均径流模数,结合各地区多年平均降水量,对重庆市地下河水资源的分布规律进行了分析,得出地下河发育密集地区并不一定就是水资源量大的地区;降水量高的地区也不一定是地下河水资源量大的地区,二者在重庆市存在较大差异。这主要是和各地下河的地质背景、构造条件、岩性、汇水面积、降雨特征等因素的相匹配情况有关。
In this paper, ArcGIS software is used to extract 1: 200000 hydrogeological maps in Chongqing, and the total number of underground rivers in Chongqing is 380, with a total length of about 1898.43km. The average annual flow is about 144.20m3 / s and the water resources is about 45.47 × 108m3 / a. In general, the underground rivers in Chongqing are mainly distributed in the northeast and southeast of Chongqing, and their distribution ranges are consistent with the distribution of carbonate rocks in Chongqing. At the same time, by using the development density of underground river and multi-year average runoff modulus, and combining with the average annual precipitation in various regions, the distribution of underground river resources in Chongqing is analyzed. It is concluded that the underground river development is not necessarily the large amount of water resources Of the area; the areas with high precipitation are not necessarily the areas with large underground river resources, and the two are quite different in Chongqing. This is mainly related to the geological conditions, geological conditions, lithology, catchment area, rainfall characteristics and other factors in different places.