New ideas and key technologies for pollution control of typical non-homogeneous karst groundwater
The underground river system is characterized by ＂quick replenishment and quick discharge＂,drastic changes in flow dynamics,etc.The unevenness of karst development and the concentration of groundwater runoff have caused great dif-ficulties and risks for traditional groundwater pollution control.Taking the typical karst groundwater system in Guizhou as the research unit,this paper,on the basis of analyzing the engineering ideas,measures and effectiveness of karst groundwater pol-lution treatment under similar non-homogeneous conditions,studies the new ideas and key technologies for typical non-hom-ogeneous karst groundwater pollution treatment,starting from the original karst hydro-geological conditions,based on the classical groundwater dynamics and following the characteristics of groundwater recharge,runoff and discharge.It is proposed that the objective of reducing the outlet flow of the underground river can be achieved by changing the conditions of recharge,runoff and discharge of the underground river system,and that the treatment project is mainly a small-scale underground and surface"linear"project,which does not take up basic farmland,does not destroy vegetation and has a minimal impact on the ecological environment in the study area.A new approach can be adopted for the management of the upstream ＂diversion and drainage＂,the midstream ＂drainage tunnels+groundwater diversion boreholes＂,and the downstream ＂centralized collection and treatment＂.The effectiveness of this new approach to governance can achieve a ＂win-win＂ situation for both the econo-my and the ecosystem.
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