中国岩溶2017，Vol.36Issue(4)：541-549,9.DOI:10.11932/karst20170416
城市化对岩溶水系统化学组分演化的影响——以重庆市南山老龙洞地下河为例
Effect of urbanization on the hydrogeochemical evolution of karst groundwater system:A case of the Laolongdong watershed, Chongqing, China
摘要
Abstract
The underground river is in Nanshan district of Chongqing City where the karst groundwater is well-developed.There are karst depressions,sinkholes,underground rivers and exposed springs,which has the features of sensitivity and vulnerability of typical karst groundwater systems.Due to urbanization and human activities,groundwater in this area has been seriously polluted in recent years.In this paper,an underground river conduit in the karst area is taken as an example.Through analyzing the evolution of the underground,water quality deterioration and pollution sources of the groundwater,the main controlling factors of groundwater pollution in the study area are discussed,in order to protect the groundwater and provide a scientific basis for groundwater governance in this area.From 2008 to 2012,the outlet of Laolongdong underground river was chosen as a water quality minoring locality where pH value,conductivity,water temperature,potassium,sodium,calcium,magnesium,bicarbonate,chloride,nitrate,sulfate and phosphate were measured on monthly basis.The principal component analysis (PCA) was used to analyze the variation of water quality during the rainfall event in August 2011.Results indicated that in the process of urbanization,the ion concentrations of sodium,chloride,phosphate,calcium,magnesium,bicarbonate increased because of human activities.Meanwhile,the ion concentrations of nitrate,sulfate decreased due to the urbanization effect and agricultural activities.Moreover,water-rock interaction,human activities,and soil erosion played a crucial role in the hydrochemistry compositions and variation of the groundwater.Among them,dump of domestic sewage and solid wastes and the excessive uses of pesticide/fertilizers in urban residential areas are the main sources of pollutants such as potassium,sodium,chloride,sulfate,nitrate,phosphate,iron,manganese and aluminum in underground rivers.The water quality in this region varies because of the improvement of the urbanization levels and regional environment change.From the annual variation of nitrates and sulfates,the groundwater quality has been greatly improved.The karst area is sensitive and vulnerable in ecological environment.For resources protection purpose,it is essential to develop and utilize groundwater resources reasonably and reduce negative effects of groundwater pollution caused by human activities for realizing a win-win situation between the local economic benefits and sustainable development.关键词
岩溶地下水/城市化/污染/水质演化/老龙洞地下河Key words
karst groundwater/urbanization/pollution/water quality evolution/Laolongdong watershed分类
天文与地球科学引用本文复制引用
张海月,杨平恒,王建力,蓝家程,詹兆君,任娟,张宇..城市化对岩溶水系统化学组分演化的影响——以重庆市南山老龙洞地下河为例[J].中国岩溶,2017,36(4):541-549,9.基金项目
国家自然科学基金项目(41103068) （41103068）
中央高校基本科研业务费专项(XDJK2014A016) （XDJK2014A016）
