Evaluation Of Geological Environment Carrying Capacity In Erhai Basin

The Erhai Watershed is located in the northwestern part of Yunnan Province.It is the economic and cultural core area of the Dali Bai Autonomous Prefecture,including most parts of Dali City and the eastern part of Eryuan County.It is a famous tourist destination in my country.In recent years,with the economic development and the prosperity of tourism,coupled with the complex geological environment conditions in the study area,it is necessary to evaluate the carrying capacity of the geological environment,which can provide data support and suggestions for the development planning of the district government.Based on the actual geological environment of the Erhai Lake Basin,this paper summarizes the development status of geological environment carrying capacity and various research methods,collects data from various sources,selects a total of 16indicators in geological,ecological,and social aspects,interprets and processes each evaluation indicator and grades Assignment,reclassify into raster layers with the same resolution,use AHP,Critic assignment method,game theory combination weighting method to calculate weights,use multi-index comprehensive evaluation method to construct evaluation system,rely on ArcGIS platform to calculate the The carrying capacity of the geological environment divides the carrying capacity into four levels for evaluation and analysis,and proposes comprehensive prevention and control measures.The main results are as follows:1.Summarized the definition,connotation and characteristics of geological environment carrying capacity.Definition:Within a certain time and a certain space,consider that the geological environment background in the entire area does not change substantially,that is,the geological environment system is maintained at a certain state,and it has an external impact on human activities and other geological environment systems.Maximum affordability.The connotation of the carrying capacity of the geological environment is expounded,and it has the characteristics of objectivity,variability and controllability.2.The multi-index comprehensive evaluation method used in this paper builds an evaluation system,summarizes a variety of subjective,objective,and combined methods for calculating weights,compares the advantages and disadvantages of each objective method for calculating weights,and finally uses game theory combined weighting method to analyze the level The method and Critic assignment method are combined to determine the weight.3.According to the actual geological environment of the Erhai Lake Basin,the three major subsystems of geological environment,ecological environment and social environment were selected,elevation,aspect,slope,surface relief,engineering geological rock group,geological structure,geological disaster,rainfall 16 indexes including temperature,sunshine,relative humidity,vegetation coverage,rocky desertification,soil erosion,population,and economy have established an evaluation index system for the carrying capacity of the geological environment.4.Divide the evaluation results of the bearing capacity into four types:high,medium,low and low.The area with the highest bearing capacity is the largest,780.1km~2,accounting for 33.4%of the study area;the area with the middle bearing capacity is 666.9 km~2,approximately It accounts for 28.6%of the study area;the area with low bearing capacity is 567.2 km~2,accounting for 24.3%of the study area;the area with low bearing capacity is the smallest,318.3 km~2,accounting for 13.6%of the study area.And put forward the comprehensive prevention countermeasures of the geological environment in the study area.