Abstract

In this paper, a groundwater control method in coastal seawater intrusion areas was proposed. The artificial neural network (ANN) was used to establish the relationship between precipitation, groundwater exploitation, groundwater chlorinity and groundwater level. The double control standard of groundwater (groundwater level and groundwater exploitation) with no seawater intrusion was obtained. The method was applied to Shuangdao Bay in Weihai. It provides a theoretical basis for scientific management and resource development and utilization of coastal areas.

Introduction

Seawater intrusion refers to the process that the balance between fresh water and seawater is destroyed and seawater invades inland along the aquifer.(Cai and Ma, 1996) Seawater intrusion disasters pollute the underground fresh water resources, resulting in the deterioration of the ecological environment, which has a serious impact on coastal areas.(Guo and Huang, 2003; Yin et al, 2011) The development of seawater intrusion disaster involves many factors, such as geohydrology environment, topography feature, climate change and human activities. The change of hydrogeology and topography is generally slow, while climate change and human activities are the inducing factors of seawater intrusion disaster. In order to control seawater intrusion, the most effective measures is to reduce the exploitation of underground fresh water and balance the interface of seawater and fresh water.

The seawater intrusion mechanism, types, monitoring have been systematically studied by domestic and foreign scholars. But the research on groundwater control in seawater intrusion areas is rarely reported. In order to meet the need of sustainable development of economy and society in coastal areas, in this paper, a groundwater control method in coastal seawater intrusion areas was proposed. Groundwater control included two aspects of groundwater level and groundwater exploitation. It was applied to Shuangdao Bay in Weihai and gave the control standard of groundwater at control point. The research results provide a theoretical basis for scientific management and resource development and utilization of coastal areas.

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