| 岩溶地下河浊度来源及对示踪试验影响的定量分析 |
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| 关键词:quantitative tracer test underground river turbidity tracer karst conduit |
| 基金项目:国土资源部公益性行业专项(编号: 201411100);中国地质调查局地质调查项目(编号: 1212011220959) |
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| Quantitative Analysis of the Source and the Effect of Turbidity in Karst River on Tracer Test |
| The quantitative tracer technique is an important method for analysis of geometrical and hydraulic characteristics of karst aquifer. Turbidity is the key factor for accuracy of tracer test although its source and relationship to tracers remain unclear. Three tracer tests under different hydrodynamic conditions were conducted for typical southwest karst underground rivers. Actual measurement data on turbidity, discharge and tracer concentration were analyzed to discuss the source and the effect of turbidity on tracers. During the test, the upper and lower critical discharge was proved to be existent, which caused the gradual transition from the laminar to turbulence and the transition of the main source of turbidity from resuspended origin to allochthonous origin. The values of upper and lower critical discharge were inferred to be 0.7 and 0.4 m3/s, respectively. The result shows that there is a negative correlation between turbidity and tracer concentration when the value of turbidity is greater than 25. With the increasing turbidity, the impact on the tracer concentration becomes greater. Finally, the karst conduit parameters were estimated by the first test which was relatively insignificantly influenced by the turbidity. The results achieved by the authors provide the basis for further water resource evaluation. |
| ZHAO Liang-jie,XIA Ri-yuan,YI Lian-xing,YANG Yang,WANG Zhe,LU Hai-ping.2016.Quantitative Analysis of the Source and the Effect of Turbidity in Karst River on Tracer Test[J].Acta Geoscientica Sinica,37(2):241-246. |
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