Effect of Tides on the Stratigraphic Resistance of the South Coast of the Laizhou Bay

Qiao Su,Tengfei Fu,Xingyong Xu,Guangquan Chen,Wenquan Liu

doi:10.4236/jwarp.2017.96039

Abstract

Seawater intrusion is a global environmental problem that is becoming increasingly severe with the overexploitation of underground freshwater in coastal regions and sea-level rise caused by global climate change. Although a series of achievements has been made on seawater intrusion, the role of tidal effects has not been fully revealed. In this paper, a typical case of tidal effects on seawater intrusion is provided. The high-density resistivity method was applied to the high-frequency continuous measurement of the stratigraphic resistance of the south coast of the Laizhou Bay, followed by the panel data analysis method. The results indicate that the formation resistivity in coastal area was affected by the tidal level significantly, particularly in the seawater intrusion channel. The effect of tide on the intensity distribution of formation resistivity was evaluated using this method. Because of the presence of a brine layer in the section, the trends of the tidal level effect on the formation resistivity in the left and right sides of the section were opposite, and the intensity of the effect increased sideways.

Highlights

On a global scale, the economy in coastal regions is booming; the water consumption is increasing
The results indicate that the formation resistivity in coastal area was affected by the tidal level significantly, in the seawater intrusion channel
The high-density resistivity method was applied to measure the formation resistivity, and the results were analyzed by the panel data method

Summary

Introduction

The economy in coastal regions is booming; the water consumption is increasing. The overexploitation of groundwater in these areas is common. A hydraulic connection exists between the groundwater and seawater; the balance between the groundwater and seawater in coastal regions would be destroyed because of natural factors and overexploitation [1]. The seawater intrusion is widespread in coastal regions globally, in the dryland and semidryland areas. Seawater intrusion has been found in dozens of countries and regions such as America, Australia, Lebanon, Israel, Japan, and Egypt [2]

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