Analysis On Eco-geologically Environmental Evolution And Vulnerability In Urban Wetland

Wetland forms a unique ecosystem with the interaction between ground and water on the earth.However,with the continuous advancement of economic construction,wetland is directly exploited and over-utilized,and the vulnerability of wetlands leads to the reduction of their area,the degradation of their functions,and the great damage to their ecological balance.Therefore,the ecological environment evaluation and vulnerability analysis of wetlands are of great significance.The trunk stream of the Yellow River is in the west of wetland in Jinan,and the largest tributary-Yufu River cross this area,which includes Yuqing Lake as its water source.The wetland is the biggest urban wetland in Shandong province,and its ecological environment is quite vulnerable.In order to make the use of wetlands economically sustainable and protect the precious natural resources,this paper conducts in-depth research and systematic evaluation on the status and ecological environment of Jishi wetland resourcesThis article is based on ecological hydrogeology and environmental geology by data collection,remote sensing,geological(soil,groundwater and surface water)sampling,data acquisition,and groundwater numerical simulation methods.The paper surveied and evaluated the resources and the environment of the wetland at the present,grasped the wetland water-chemically evolutional and soil chemical characteristics from time and spatial distribution in Jinan.The paper also summarized the distribution and migration patterns of the pollutants in the wetland system,studying interaction mechanism of different chemical elements between groundwater,surface water and soil.Then the study conclued the vulnerability evaluation of the wetland.This paper provides the unified,complete,timely and accurate basic information and decision-making basis for the protection,management and rational utilization of wetland resources.(1)Within the use of analysis data from wetland soil,surface water and groundwater samples,to establish,the distribution map of pollutants concentration was established by using mathematical interpolation method between the wetland area soil,surface water and groundwater.Then the model added deep soil corresponding to the concentration of the pollutants as a reference between the surface soil and groundwater,and analyze the distribution of different medium of various kinds of pollutants.Based on the same distribution of pollutant concentration in soil(from shallow to deep),surface-water and groundwater,the paper analyzed the diffusion mechanism in soil,surface water and groundwater,and indicaed diffusion process of pollutants so as to summarizes the wetland area of interaction in soil,surface water,and groundwater.(2)By using the data of area groundwater water level and the analysis of hydrogeological condition,Numerical Simulation of Groundwater Model with MODFLOW was established under reasonable generalization.According to this and combining with the regional hydrogeology investigation and monitoring analysis of groundwater quality,the platform of GMS-MT3DMS module was established to calculate in the migration of groundwater pollutants in order to simulate and predict the range and the degree of groundwater pollution under different context.(3)The Delphi evaluation index system was used to extract the basic remote sensing information of the wetland in the west of Jinan by collecting basic data and information,which based on ArcGis platform to establish the geologically ecological vulnerability assessment information data and attribute database of the wetland.Delphi scoring method was used to select the evaluation index in order to establish the evaluation index system to divide the vulnerability level.Then,the individual factors were analyzed and evaluated respectively to generate the sensitivity grading map of individual factors in ArcGis,and then the superposition analysis was conducted to form the comprehensive evaluation map for being analyzed and evaluated.Based on the above research,the influence of human activities on the wetland system was summarized,and the method of harmonious coexistence between human and wetland was proposed.According to the environmental situation and development relularity of the wetland system,the vulnerability of geologically ecological environment of the wetland system was evaluated,the influence of human activities in the wetland system was summarized.