关于南洞地下河系统南边界问题的讨论

岩溶水系统的划分研究是水均衡分析、水资源评价的基础。南洞地下河是中国南方4个超大型地下河系统之一,其水文地质条件复杂,开发潜力巨大。由于南洞地下河系统蒙自盆地内有第三系阻水深槽存在,使得该区地下水位高于南北两侧,部分研究认为该阻水带是南洞地下河系统的南边界。本次通过进一步收集盆地内部和外围水文地质钻孔及地热钻孔资料、野外调查、洞穴探测及示踪试验,认为盆地内阻水深槽并不阻挡深部地下水,南洞地下河系统南边界应南移至南部地表分水岭一带。蒙自盆地及南部地下水流向应整体由南向北。

Discussion on Southern Boundary of Nandong Underground River System

The study on the division of karst water system is the basis of water balance analysis and water resource evaluation. The Nandong undei^round river is one of the 4 super large underground river systems in southern China. Its hydrogeological conditions are complex and its exploitation potential are also tremendous. Due to the existence of deep grooves in Tertiary in the Mengzi basin of the Nandong underground river system, the groundwater level in this area is higher than that of the north and south sides, and some studies suggest that the water resistance zone is the southern boundary of the Nandong underground river. Through the further collection of hydrogeological and geothermal drilling data inside and outside of the basin, field investigation, cave detection and tracing test, this paper found that the deep grooves do not block deep groundwater, and the southern boundary of Nandong underground river system should be moved to the southern surface watershed area.The groundwater flow in the Mengzi basin and the South should be from south to north as a whole.