| Wumeng Mountain,concentrated special difficulties area in southwest China,is one of the main battlefields of the new round of national poverty alleviation and development strategy.Its complex,changeable,fragile eco-geological environment and the impact of increasing human activities are a great bottleneck to guarantee and improve people's livelihood.Through the 1:250000 scales eco-environmental geological investigation in Hezhang county of the Wumeng Mountain,eco-geological environment evaluation index system and evaluation model wereinitially established.Based on the ENVI and ArcGis software,the analytic hierarchy process and fuzzy comprehensive evaluation methods were used to evaluate eco-geological environment in Hezhang county.The results are achieved as follows:1.Information from Remote sensing image of Hezhang county was extracted by ENVI software to analyze the eco-environmental geological conditions,such as rock exposed rate,vegetation cover rate,slope,and so on.Combining eco-environmental geological survey and research on 1:250000 scale,the causes and distribution characteristics of the main eco-environmental geological problems were discussed.2.Based on the conditions and main problems of eco-environment geology in Hezhang county,3 levels frame model which included target level,factor level and index level was established and so did eco-environmental geological assessment index system composed of 5 factors and 16 indices.3.Based on the overlying of factor level and space analysis in ArcGis,the eco-environment geology in Hezhang county was regionalized by each factor level to obtain three levels of region for geological hazard,three levels of region and 31 subzone for mining eco-geological environment,five levels of region for groundwater environment,and so on.4.By using the basic principles of eco-geological environment evaluation combined with analyzing the current situation of eco-geological environment in Hezhang county,fuzzy comprehensive evaluation model was established to integrate 5 eco-geological environment problems to assess the eco-geological environment on county scale.Finally,eco-geological environment in Hezhang county was divided into 5 levels of region,namely,the Best,the Better,the Good,the Bad and the Worse areas and 16 sub-regions.Each sub-region was reviewed from the background and main problems of eco-geological environment and its rehabilitation to supply geological support for the construction of ecological civilization. |
PDF Full Text Request