Evolution analysis and environmental management of intruded aquifers of the Dagu River Basin of China

Guiyao Xiong; Qingxian An; Tengfei Fu; Guangquan Chen; Xingyong Xu

doi:10.1016/j.scitotenv.2020.137260

Evolution analysis and environmental management of intruded aquifers of the Dagu River Basin of China

Sci Total Environ. 2020 Jun 1:719:137260. doi: 10.1016/j.scitotenv.2020.137260. Epub 2020 Feb 12.

Authors

Guiyao Xiong¹, Qingxian An², Tengfei Fu³, Guangquan Chen³, Xingyong Xu³

Affiliations

¹ Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210023, China; Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China.
² School of Business, Central South University, Changsha 410083, China. Electronic address: anqingxian@csu.edu.cn.
³ Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China.

PMID: 32120094
DOI: 10.1016/j.scitotenv.2020.137260

Abstract

The seawater intrusion in the Dagu River Basin, China, has attracted intensive attention from the government and scholars. Increasing data have become available with the development of data acquisition technology. This situation brings unprecedented opportunities and challenges to the hydrochemical evolution analysis and improvement of seawater intrusion. The hydrochemical evolution process of groundwater is studied on the basis of our collected data in the Dagu River Basin by using mathematical statistics, end-element mixing, Durov, and Gibbs. The negative influencing factors of the groundwater environment are determined. Results show that the groundwater on the north side of the cutoff wall is mainly affected by residual saltwater, sulfuric acid leakage, and NO- 3 pollution. The groundwater on the south side of the cutoff wall is seriously affected by seawater invasion, followed by NO- 3 pollution. Meanwhile, the groundwater on the west bank of the Dagu River Basin is mainly affected by NO- 3 pollution. The groundwater on the north side of the cutoff wall must be discharged on a large scale for its improvement. Meanwhile, unpolluted water is recharged to renew the groundwater resources. Groundwater exploitation should be reduced, and the exploitation area should be dispersed to mitigate seawater intrusion and increase the recharge of the groundwater resources. NO- 3 pollution mainly comes from the sowing of chemical fertilizers and pesticides and domestic waste. Therefore, we should reduce the use of pesticides and fertilizers to control the generation, storage, and treatment of domestic pollutants strictly.

Keywords: Anthropogenic influence; Evolution; Groundwater environment; Seawater intrusion.