基于在线高分辨率示踪试验的岩溶地下河管道特征分析——以重庆市彭水县岩窝坨至纸厂泉段地下河为例  

Determination of the Conduit Structure in a Karst Subterranean River Based on the Technique of Online and High-Resolution Tracing Test-A Case Study in Pengshui County,Chongqing

作　　者：刘树林 范泽英 杨平恒[2,3,4] 卢丙清 黄山松 张宇[4] 陈雪彬[4] 

机构地区：[1]重庆市地质勘查开发局南江水文地质工程地质队,重庆401121 [2]中国地质科学院岩溶地质研究所,桂林541004 [3]国土资源部广西岩溶动力学重点实验室,桂林541004 [4]西南大学地理科学学院,重庆400715

出　　处：《西南大学学报（自然科学版）》2015年第10期125-130,共6页Journal of Southwest University(Natural Science Edition)

基　　金：广西岩溶动力学重点实验室开放基金(KDL2012-08);重庆市国土资源和房屋管理局科技计划项目(CQGT-KJ-2012022;CQGT-KJ-2014056);中央高校基本科研业务费专项资金(XDJK2014A016)

摘　　要：以重庆市彭水县岩窝坨至纸厂泉段地下河为研究对象,将荧光素钠作为示踪剂,利用在线高分辨率示踪技术获取地下水中荧光素钠穿透曲线,结合定量计算方法分析地下河管道几何特征.结果表明:试验示踪剂回收率为82.2%,证明纸厂泉为该流域岩溶地下水的主要排泄出口;穿透曲线为双峰型,表明岩窝坨至纸厂泉段岩溶地下河存在2条并联的岩溶管道.定量计算发现地下河储水管道的平均直径为17m,储水体积为4.5×106 m3.It is relatively difficult to research the conduit structure in karst subterranean rivers in South China due to the high heterogeneity of their water-containing media.A case study was made of the conduit section of a subterranean river from Yanwotuo to Zhichang Spring in Pengshui County,Chongqing.A technique of online and high-resolution tracing test was employed with uranine as the tracer.The breakthrough curve（BTC）of the uranine in the karst groundwater was obtained to quantitatively investigate the geometrical characteristics of the conduit structure and the flow field.The results showed that the recovery mass rate of the injected uranine was as high as 82.2%,indicating that the Zhichang Spring was the main discharging outlet of the karst watershed basin,and the breakthrough curve（BTC）presented a doublepeaked shape,indicating the existence of two parallel karst conduits in the study area.Based on a quantitative calculation of the BTC,the mean diameter of the conduits and the water volume in the karst aquifer were 17 mand 4.5×10^6 m^3,respectively.In conclusion,owing to its characteristics of high precision,high automatic degree and low cost,the technique of the online and high-resolution tracing test can be widely applied in karst hydrogeology surveys.

关 键 词：在线高分辨率 示踪试验 地下河 岩溶管道 彭水县 

分 类 号：P641.1[天文地球—地质矿产勘探]