Pollution pattern of underground river in karst area of the Southwest China |
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| Authors: | ZHOU Chang-song ZOU Sheng-zhang ZHU Dan-ni XIE Hao CHEN Hong-feng WANG Jia |
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| Affiliation: | 1Karst Dynamics Laboratory, MLR, Key Laboratory of Karst Ecosystem and Treatment of Rocky Desertification, Institute of Karst Geology, Chinese Academy of Geological Sciences. 2China University of Geosciences (Beijing). |
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| Abstract: | Investigation of groundwater pollution has been carried out on multiple typical karst underground river systems in recent years in order to reveal the characteristics and mechanism of underground river pollution. Through the summary of the survey results, five characteristics of underground river pollution have been revealed, including directionality, weak hysteresis, easier for reversibility, linear and intermittent (or seasonal); combining with karst geomorphic types, pollution sources (primordial, secondary pollution and compound), pollution ways and pollution receptors, three basic pollution patterns of the underground river were depicted: Recharge area pollution, runoff area pollution and discharge area pollution. At the same time, the study discloses the reality of the underground river pollution is the three basic patterns and their subgenera in combination with super imposition on the space and time. And from the angle of the hydrogeological model, the study expounds the process of underground river pollution. Finally, the study gives naming rules of pollution pattern of the underground river and sets up PISAB method of pattern recognition. The results provide scientific basis for pollution repair and management of underground river in the southwest karst region. |
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