Using statistical methods,the hydrochemical characteristics of underground brine was studied in the littoral plain along the south of Laizhou Bay. The results demonstrate that: the main chemistry types of underground brine is Na-Cl and Na-Mg-Cl,and its hydrochemical characteristics consist well with seawater; the coefficients namely rNa/rCl、k/br、rMg/rCa, indicate the underground brines, with greater concentration and weaker metamorphism, originated from seawater.
Under the background of global environmental change and the influence of human activities on the environment increasingly significant, the research of continental-oceanic interaction has become the current hot issues in geological field research. The continuous dynamic monitoring of groundwater will be conducted, and technology validation about the dynamic changes of groundwater vary with tidal interactions will be studied in the seawater intrusion area of the laizhou bay using high density electrical method in this research.The results suggest that,If we obtain the value of electrical characteristics of the fresh-saline groundwater by numerically or laboratory experiments, Such as we choose 15 Ω· m in Laizhou Bay, we can use high-density electrical to continuous monitor to solve the Scientific Problems of the interface of the fresh-saline groundwater with the effect of tidal variation.
Monitoring of coastal saline soil water and salt transport is of great value on the soil physics and irrigation studies. In this paper, a vertical infiltration experiment was conducted to monitor the vertical variation of resistivity in the leaching process under different water level in an experimental tank by the designed automatic monitoring device. The experimental results showed regardless of whether the groundwater exist, the resistivity peak moved down in the curve of leaching, and the desalination occurred from the top to bottom, the desalination depth remains the same with the same leaching amount. However, the groundwater reduced the speed of water and salt transport and affected the water and salt migration of upper soil due to the capillary force.
Soil salinization problem was serious in Southern area of Laizhou Bay under the influence of shallow underground brine. In this patter, the dynamic changes of soil salinity in summer and fall were analyzed by using classical statistics and geo-statistics. Results indicated that soil salinity of each 1ayer shows great variability. The layers of 0~30cm, 30cm~60cm in summer and 30cm~60cmlayer in autumn showed moderate spatial autocorrelation, while the other layers showed strong spatial autocorrelation. The spatial distribution maps of soil salinity interpolated by Kriging method indicated that the spatial distribution of soil salinity of different layers were similar, the salt content decreased from the coastal area to inland and presented zonal distribution.
Laizhou Bay is the most typical and serious region suffering from the geo-hazard of the seawater intrusion in China. The information value model and GIS are used for the hazard assessment study of seawater intrusion disaster in the Laizhou Bay. The assessment indexes are conceived through choosing the factors such as mineralization, groundwater level, geological condition, intensity of human activities and offshore distance . ArcGIS software is applied involving in data collection, data management, data analysis and evaluation process expressing. Finally, the hazard assessment about seawater intrusion disaster is classed into high, medium and low. The result shows that the boundary between the more dangerous and less dangerous zone is the line of Shouguang-Hanting-Changyi. The high-risk area is accounted for more than 46% of the evaluation area. The saltwater under the south of Laizhou plain is main source of the seawater intrusion disaster, and pumping the underground freshwater and saline groundwater is the induced conditions of the seawater intrusion disaster.
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