Flow field inversion of karst underground river and estimation of hydrogeological parameters based on online tracer technique
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摘要: 以青木关岩溶地下河为例,利用在线高分辨率示踪技术获取基础数据来探寻岩溶地下河形态特征，估算水文地质参数。试验中示踪剂回收率高达99 %,示踪剂历时浓度曲线有两个孤峰，前后峰值浓度分别为37.63 μg/L和1.21 μg/L, 两个孤峰的偏度和峰度均大于0，据此推测青木关岩溶地下河并无较大溶潭发育，且地下河流态为紊流流态。根据试验所得数据结合地下河地理空间信息，以经验公式估算得到地下河平均流速、摩擦系数、雷诺数、舍伍德数、施密特数等水文地质参数，分别为204 m/d、0.26、127 980、4 165、1 140，表明青木关地下河管道内部结构复杂，地下水环境比较脆弱，且估算得到的雷诺数所表征的地下河水流态与示踪剂历时浓度曲线得到的结果一致。Abstract: A high-resolution online tracer test is performed in the Qingmuguan karst underground river system to get essential data for researching the morphologic features of karst underground river and estimate hydrogeological parameters. The recovery rate of the tracer is 99 %. The break-through curve of the tracer has two peaks. The first and the second peak value is respectively 37.63 and 1.21. The skewness and kurtosis of the two peaks are both greater than 0. The results of test confirmed that there is no pond developed in the Qinmuguan karst underground river. And the groundwater flow is turbulent. The paper presents empirical formulas and the formulas with practical physical meaning according to the test data and geospatial information of the underground river. The mean velocity of groundwater,friction factor, Reynolds number, Sherwood number and Schmidt number were estimated by these formulas, and the value is respectively 204 m/d, 0.26, 127 980, 4 165,1 140. These parameters show that the structure is complex in the pipeline of the Qingmuguan underground river and the environment of groundwater is vulnerable. In addition, the flow state that is represented by the estimated Reynolds number is consistent with the result that comes from concentration curve of the tracer.
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Key words:
- online tracer test /
- karst underground river /
- hydrogeological parameter /
- Qingmuguan
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