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碳酸盐岩地区在CO_2和H_2O的作用下被溶蚀产生溶隙、溶洞,甚至发育出地下河,如位于重庆南山的总长约6km,常年流量50~80L/s的老龙洞地下河。地下河出口处形成溶洞,成为AA级景区。有约600m可步行进入,再向内约400m可划船进入。老龙洞地下河流域面积约12km~2,属亚热带季风区,年均降水量约1100mm,主要集中在5~9月。岩溶区地表发育土壤层薄,甚至缺失,再加上岩溶管道、裂隙、落水洞、竖
Carbonate rocks are dissolved by CO 2 and H 2 O to produce sags, caves and even underground rivers. For example, the old Longdong underground river with a total length of 6km and an annual flow rate of 50-80L / s is located in Nanshan, Chongqing. Underground river exit to form a cave, a AA-level scenic spots. About 600m walkable into, and then about 400m inward rowing can enter. Laolongdong underground river basin area of about 12km ~ 2, is a subtropical monsoon region, with an average annual rainfall of about 1100mm, mainly concentrated in May to September. Karst area surface soil layer thin or even missing, coupled with karst pipe, fissures, water holes, vertical