Early-warning Evaluation On Eco-geological Environment Security On Panxi Mineral Concentration Area

In response to the urgent need for protection and early-warning of vulnerable ecogeological environment caused by regional mineral resources exploitation,focusing on the blank of quantitative study on ecological security mechanisms as well as the short backs of current ecological security evaluation early-warning research on process depiction and ecological security threshold assignment,this study adopted “3 S” techniques on a critical mineral resource base of China--Panxi mineral concentration area,where locates on the transition zone between Qinghai-Tibetan Plateau,possessing complex geological structure and vulnerable ecosystems.This study comprehensively utilized spatial information technology and field survey methods to obtain data as well as to accomplish data mining,aiming at understanding eco-geological environment security process mechanism along with establishing site-specific eco-geological environment security evaluation index system for the study area.Based on project pursuit model,catastrophe theory and support vector model,this study established specific evaluation and early-warning model for eco-geological environment security process in mineral areas.Along with conducting eco-geological environment security process analysis and trend early-warning for regional mineral resources exploitation,this study explored spatial-temporal change patterns of regional eco-geological environment security,providing technical support for eco-geological environment protection and early-warning in mineral areas.Results of this study are listed as following:(1)Considering both nature and human factors,this study conducted classic regression analysis and comparison methods on eco-geological environment security process mechanism in the study area.Based on that,genetic-ant colony algorithm was applied to establish site-specific eco-geological environment security evaluation index system.(2)Utilizing project pursuit model to assist integrated analysis on nature and human factors,in this way,integrated impact index of both nature and human factors were obtained;furthermore,based on cusp-catastrophe model,eco-geological environment security catastrophe model was established for regional mineral resources exploitation.In accordance with modeling results,the eco-environment condition in study area was dominated by secure and relative secure classes,followed by light earlywarning and severe early-warning classes,while unsecure condition(dangerous condition)was the least in terms of area.Moreover,prediction on eco-geological environment security conditions in 2017 was presented.Predicted results indicate that unsecure condition(dangerous condition)extension regions mainly distribute across Huashan coal mining area,Hongge and Baima iron ore mining area.(3)Unsecure condition(dangerous condition)expanded quickly,mainly distributing on areas where possessed high intensity of geological hazard,mineral resources and population;severe early-warning condition concentrated on Huashan coal – Panzhihua iron ore – Hongge iron ore mining zone;light early-warning condition concentered on Anning river valley,Jinsha river valley and Huili basin;relative secure condition widely distributes across the study area where was dominated by mediumlow mountains;secure condition located at northwest and northeast of the study area.Generally,indexes include land use type,economic activities,mineral resources exploitation condition and pollution condition have significant influence on modeling results.After categorizing the study areas according to different eco-geological environment security classes,site-specific reconstruction suggestions were proposed.(4)In sum,this study established a site-specific evaluation and early-warning system for eco-geological environment security in regional mineral resources exploitation,providing theoretical basis for further eco-environment security reservation and protection.