Study On Groundwater Resources Evaluation And Protected Area Division Based On Modflow And Factor Analysis-Fuzzy Comprehensive Method

Water is the source of life,the material basis for human survival,and the indispensable natural resource for the sustainable development of society.Shouguang area,as one of the important vegetable planting bases in China,needs to exploit a large amount of groundwater in daily life to meet the water demand.However,in the process of groundwater exploitation,due to the lack of scientific groundwater regulation and reasonable and effective management measures,the unreasonable exploitation and resource waste of groundwater in shouguang area have resulted in environmental geological problems such as the continuous decline of groundwater level and water quality pollution.In order to solve the water resource crisis caused by groundwater exploitation in Shouguang area and ensure the sustainable development of the city,and make full use of the local groundwater resources,this paper takes the groundwater resources in Shouguang area as the research object,based on comprehensive analysis of geological and hydrogeological conditions in Shouguang area,and uses the Groundwater Modeling System(GMS)and mathematical theory method.The groundwater flow field,water quantity,water pollution risk and the division of water source protection areas in Shouguang area were evaluated and studied.The groundwater flow numerical model of the study area is established by using the groundwater numerical simulation software GMS.The model is identified and validated by the trial-estimate-correction method.The groundwater quantity of the study area is evaluated by the equilibrium method.The groundwater recharge resources,exploitable resources and aquifer storage are obtained.On the basis of the present model,the prediction models of groundwater recharge and discharge items and groundwater flow field change under different water resources exploitation rates in the next 20 years are established,and the maximum allowable exploitation amount of water source areas which are beneficial to the restoration and protection of the ecological environment is given.A groundwater quality evaluation model based on factor analysis and fuzzy comprehensive evaluation method was established,and the water quality zoning map of the study area was drawn.By analyzing the spatial distribution characteristics of pollution load risk,the vulnerability of groundwater aquifer and the harmfulness of groundwater pollution,the risk assessment of groundwater pollution in the study area is carried out by using groundwater pollution risk intensity index and GIS superposition analysis method.The groundwater pollution status,groundwater quality change trend and groundwater pollution risk are considered comprehensively.On this basis,the early warning model of groundwater pollution in the study area was constructed,and the distribution maps of groundwater pollution risk assessment and the early warning status of groundwater in the study area were obtained.According to the distribution characteristics of groundwater flow field in the study area,using the water source geological point tracking model,using reverse tracing method to divide the water source areas in the study area into protected areas,and put forward relevant protection measures.