The Suitability Evaluation Of Urban Geological Environment Quality For Yantai City

Urban geological environment is a variety of geological factors that impact the development of cities.Therefore,the study of urban geological environment can provide service for urban planning,construction and development.With the advancement of urbanization and industrialization in Yantai,the city is faced with a series of geological environment problems because the development of economy and society not only increases the exploitation and utilization of intensity for natural resources?for example land,underground space,groundwater resources,etc?but also enhance the transformation of geological environment.Combining with the survey for hydrogeology,engineering geology and environmental geology,the remote sensing interpretation of environmental geology,misering,pumping test,geotechnical test and water quality analysis,the geology,hydrogeology,engineering geology and environmental geology conditions of study area were understood.With choosing different evaluation factors the groundwater environment quality,the geological environment suitability for exploitation and utilization of urban underground space and the geological environment suitability for urban construction were evaluated by using the method of analytic hierarchy process?AHP?,fuzzy mathematics and synthesis evaluation in this study.The results are as followings:?1?According to the quality of groundwater,Yantai area is divided into three zones that is good area,bad area and the worst area.The overall trend is that the groundwater quality of inland areas is better than the coastal areas,besides in industrial zone it is better in the upstream region and the hilly region also is better than quaternary distribution area.?2?The corrosion ability of groundwater belongs to class? on the basis of the types of environment.?3?Some single index factors of groundwater such as volatile phenol,cyanide Cu,Fe,Hg,Zn Se and Cr do not beyond the background value of groundwater in the study area.For Cl^-and SO₄^2-,the study area belongs to no pollution or less pollution area as a whole,and the local area is medium-extremely serious pollution due to seawater intrusion And NO3-in most areas of the study area,there is no pollution,and there are some pollution in some areas.?4?Combining with p H,TDS,CODMno,Mn²⁺ and Pb,the comprehensive evaluation of groundwater quality for Yantai area is studied.None polluted area mainly distribute in bedrock areas,accounting for 20.5% of the study area and slightly polluted area distribute in most areas that account for 58.7%.Moderate or very severe polluted area is annular distribution in the study area and account for 20.8%.?5?The geological environment of underground space development is divided into four zones.?6?Comprehensive evaluation of the geological environmental suitability of Yantai city,divided into five partitions.