| 贺州市合宝地下河系统的定量示踪试验与分析 |
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| 作者姓名： | 和烁荣 辛卫东 康志强 贝为昶 |
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| 作者单位： | 1.四川省工程地质勘察院,成都 610072; 2.陕西省地矿局地质三队,宝鸡 721300; 3.广西壮族在自治区地质调查院,南宁 530023 |
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| 基金项目： | 国家自然科学基金“基于水-碳耦合循环过程的岩溶碳汇评价方法(编号: 41502260)”和中国地质调查局“西南岩溶地区1:5万水文地质环境地质调查(编号: 1212011220953、12120114069001-03、121201107000150005)”项目联合资助 |
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| 摘 要： | 在岩溶水文地质调查中,示踪试验的应用是较为广泛且行之有效的方法。为确定地下河系统的岩溶含水介质结构,采用高精度在线监测技术在广西壮族自治区贺州市合宝地下河主管道上进行示踪试验。试验采用的示踪剂为荧光素钠,在线监测设备为GGUN-FL30野外荧光分光光度计。试验结果显示: 合宝地下河入口S1与出口S4之间地下河以管道流为主要特征,结构相对简单,不存在溶潭等地下储水体; 示踪剂回收率为63.18%,说明该地下河还有其他排泄途径,很有可能为地下潜流。基于Qtracer2数据分析可知,合宝地下河枯季水流的最大流速为156.00 m/h,平均流速48.09 m/h,岩溶管道储水量26 714 m3,管道过水断面面积13.70 m2,平均直径4.18 m,弥散系数0.505 m2/s,纵弥散度37.81 m,摩擦系数0.178,雷诺数48 937,舍伍德数1 875.4,施密特数1 140。合宝地下河岩溶极其发育,含水介质不均一性强,为规模较大的单一管道系统。地下水流态呈紊流型,且局部具备承压特征。研究数据及成果为建立地下河系统数值模型提供了依据。
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| 关 键 词： | 岩溶水 示踪实验 在线监测技术 合宝地下河 参数估算 |
| 收稿时间： | 2018-06-21 |
Quantitative tracer test and analysis of the underground river system in Hebao of Hezhou City |
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| Authors: | HE Shuorong XIN Weidong KANG Zhiqiang BEI Weichang |
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| Institution: | 1. Sichuan Institute of Geological Engineering Investigation, Chengdu 610072, China; 2. Shaanxi Third Institute of Geological and Mineral, Baoji 721300, China; 3. Guangxi Institute of Geological Survey, Nanning 530023, China |
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| Abstract: | Tracer test is an effective and widely used technical method in karst hydrogeology survey. In order to determine the karst aquifer structure, the authors made the tracer test on the main conduit of Hebao underground river in Hezhou of Guangxi, used high-precision online monitoring technology. Fluorescein sodium is used as tracer, and the GGUN-FL30 field fluorescence spectrophotometer is used as online monitoring equipment. The test results show that the underground river between the Entrance (S1) and the Exit (S4) is denoted by pipeline flow, and the structure is simple without any other underground water bodies such as a karst lake. The tracer recovery rate is only 63.18 %, indicating that the underground river has other discharge pathways (maybe subsurface flow). Based on Qtracer2 data analysis, the maximum flow velocity of Hebao underground river in dry season is 156.00 m/h and the average flow velocity is 48.09 m/h. Water storage of karst conduit is 26 714 m3. The conduit cross-sectional area is 13.70 m2 and the tube diameter is 4.18 m. The conduit system is charactered by dispersion coefficient of 0.505 m2/s, longitudinal dispersion of 37.81 m, friction factor of 0.178, Reynolds number of 48 937, Sherwood number of 1 875.4 and Schmidt number of 1 140. It is shown that karst is well developed and nonuniformity of aquifer is strong in Hebao underground river. So the underground river system is an single conduit system. The groundwater flow is a turbulent flow, which has being bearing pressure in part. The research data and achievements can provide some reference to the numerical model construction of the underground river system. |
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| Keywords: | karst water tracer test online monitoring technology Hebao underground river parameter estimation |
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