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Seawater Intrusion in the Coastal Area of Liaodong Bay
Chuanjun Wang, Yingchao Wu, Ke Cao, Guangquan Chen, Wenquan Liu, Yuguang Wang and Yueyin Cai

This paper describes the chemical characteristics of groundwater in the coastal areas of Liaodong Bay and finds that it is feasible to use conductivity to determine trends in seawater intrusion. A comparison between 2014 and 2018 monitoring data from the study area revealed that the most extensive seawater intrusion zones are located mainly in the Western Corridor of Liaodong Bay (Xingcheng, Huludao, Suizhong, Jinzhou) and the Dalian area. The main cause of seawater intrusion is excessive exploitation of groundwater, which has lowered the water table and disrupted the saltwater/freshwater interface. In the Liaohe Delta Plain (Panjin, Yingkou), Quaternary sediments contain a large area of saltwater, but seawater intrusion has been alleviated. Based on seawater intrusion characteristics and management needs, the coastal area of Liaodong Bay is divided into four areas, for: remediation and repair; prevention; control; and demonstration. Targeted measures are recommended for each area to prevent seawater intrusion.

Keywords: Liaodong Bay, coastal area, seawater intrusion, groundwater chemical characteristic, conductivity, influence mechanism

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