Seawater Intrusion Comprehensive Assessment And Ecological Restoration Technology Research

Yantai is an important city of the construction of shandong peninsula blue economic zone. It isnot only an important port city of China, but also has a core position in the economic zone of Bohaiand Jiaodong peninsula. However, Yantai is shortage of freshwater resources in the northern coastal.In recent years, because of the large-scale exploitation and utilization of groundwater, causing theserious problem of seawater intrusion in coastal areas of Yantai. Due to the happening of seawaterintrusion, it brings the problem of water environment deterioration and ecosystem lose imbalance inNatural Science, and it also has a serious impact on economic development of the industrial andagricultural production of Yantai. Therefore, it has an important practical significance on researchingthe fuzzy comprehensive evaluation and ecological restoration technology of seawater intrusion inYantai. In this paper, from the beginning of analysising the problem of seawater intrusion in thecurrent sitution and change trend of seawater intrusion in Yantai. And then comprehensive evaluationof seawater intrusion and the risk assessment of seawater intrusion. Be aimed at the seawaterintrusion of Yantai we put forward the ecological restoration system. In the ecological restorationsystem we study the seawater intrusion area riparian ecological slope protection technology. Themain research contents are as follows:（1）On the basis of the field research and the extensive collection of data. We analysis the naturalgeographical environment and social economic environment of Yantai. Mainly study the weather,hydrological, terrain and landform factors that relate to the seawater intrusion of Yantai. And then thepaper research on the main rivers, the main reservoir distribution, the structure of erosion landform,tectonic denudation landform, physiognomy, accumulation landform denudation, and marinelandforms of Yantai.（2） Based on describing evaluation standard of seawater intrusion.Analysis the current situationand the harm of seawater intrusion in Yantai. We research the development trend, the intrusion andintrusion causes of seawater intrusion in Yantai. The result show that, the seawater intrusion of Yantaimainly have three ways that sheet, strip and vein invasion. In the future, the seawater intrusion ofYantai will show a trend of reducing.（3） Researching on the water quality data in Yantai of the seawater intrusion in2010,2011and 2012. The paper decide to adope Cl^-、M、SO₄^2-、rHCO₃^-/rCl^-and SAR as the water chemistryindicators. Constructing the fuzzy comprehensive evaluation model. Based on the fuzzy principle ofmaximum degree of membership grade evaluation the water mathematical. On the computationalability of MATLAB software that can calculate the mathematical model. We calculate the33wellsdegree of seawater intrusion in Zhifu, Fushan （including economic and technological developmentZone） and Laishan areas through the fuzzy comprehensive evaluation.（4） Based on the data of the "Yantai Statistical Yearbook" and Mapgis of Yantai in2011. Withthe coastal areas of Yantai as an evaluation unit, using the analytic hierarchy process （AHP） todetermine the weights of the2first-order index and7secondary-indexes. on the platform of Mapgis,using layer factor weight method to get a judgement unit of seawater intrusion disastercomprehensive risk index. Based on the data of risk index to count the urban districts of seawaterintrusion in average distance. At last, the paper realize the hazard zonation of Mapgis diagram ofseawater intrusion in coastal area of Yantai.（5） For further studies addressing the effects of seawater intrusion to the ecological environment.The paper put forward the ecological restoration of seawater intrusion system, which is the threeapplication of ecological management, ecological restoration and ecological protection to achieve avirtuous circle of the inherent nature.At the same time, reach the governance effect of seawaterintrusion. Taking Yantai as an example, analyzes the ecological system in the application of seawaterintrusion, the result show that the acreage of seawater intrusion in Yantai has reduced19.6%from2010to2002. It has a remarkable result.（6） Based on comprehensive analysis of ecological slope protection mechanism, ecologicalslope protection structure and ecological slope protection vegetation selection. From the view of rootscan increase soil shear strength, select the Tamarix ramosissima root as the experimental material.Through the test of indoor direct shear, discusses the effect of the root and soil complex on rootcontent, water content and root diameter to the soil shear strength. Based on the ecological restorationsystem of seawater intrusion, the ecological slope protection technology used in seawater intrusionarea to protect the shore, and the application of the ecological slope protection technology also canimprove the ecological environment.The research productions have significance. It can scientifically guide Yantai government toimprove the hazard caused by seawater intrusion in coastal zone, to prevent and relieve the hazard caused by seawater intrusion in Yantai, to guarantee the safety of drinking water, economic securityand ecological safety. It also can promote the regional economy and environmental resourcesharmonious growth, and to realize sustainable using of groundwater resources and the sustainabledevelopment of economy. At the same time, it can provide demonstration mode and scientific basisfor the prevention of seawater intrusion in other coastal zone.