Evaluation Of Bearing Capacity Of Geological Environment In Shangnan County

Based on shangnan county of shaanxi province as the research scope,this paper aims to build suitable for mountainous area under the condition of bearing capacity of geological environment evaluation index system,focus on exploring the evaluation method of bearing capacity of geological environment of mountainous area and spatial planning technology,through more in-depth research more comprehensive evaluation on the bearing capacity of geological environment and according to the evaluation results to complete high quality land planning work.Based on remote sensing data collection and field geological survey,this paper adopts AHP-comprehensive evaluation method,takes Arc GIS,Yaahp,Matlab and other software as the research platform,and takes the geological environment carrying capacity of Shangnan County as the research object.The main research results are as follows:(1)On the basis of field geological survey,geological conditions,natural geographical environment,social economy and human engineering activity rule of four layers,stratigraphic lithology,geological structure,rivers and lateral erosion,landform type,rainfall,slope,vegetation cover income per head,the population of towns and townships,towns,farmland,linear engineering,cutting slope construction,mining elements for 13 layer,The numerical size and influence range of these 13 elements were summarized and assigned to them in a hierarchical manner.The obtained data were extracted in ARC GIS and normalized without dimension.(2)ArcGIS was used to extract Euclidean distance from the extracted river network,road and fault data to determine the influence range.(3)Using software yaahp,constructing the target layer,criterion layer and index layer,three types of evaluation index system,in view of the comprehensive evaluation on the bearing capacity of geological environment,to calculate the four criterion layer and index layer of 13 weight and size through the consistency check,the bearing capacity of geological environment as the core research objects of this study,the comprehensive evaluation method is adopted,Through the comprehensive spatial weighting calculation of multiple influencing factors,the numerical range of geological environment carrying capacity of the research target is obtained from 0.07394-0.71568.(4)In order to alleviate the problem of excessive subjective factors based on AHP,a WK-means clustering algorithm based on attribute optimization was proposed to realize the adaptive updating of attribute weight.The weights obtained by the analytic hierarchy process(AHP)and those obtained by the method of attribute optimization are integrated to realize the expert-data dual driven weight assignment model.By comparison,the Wk-means clustering algorithm has certain reliability,which provides a new idea for the follow-up research.(5)According to the natural breakpoint classification method,the geological environment carrying capacity in Shangnan County was evaluated and statistically analyzed by using four evaluation grades:excellent,good,medium and poor.The area with excellent evaluation accounted for 30.91%of the total space,mainly distributed in the south and the central Qingshan town.The areas with good evaluation accounted for the largest proportion of space,accounting for 45.28%,mainly distributed in the middle and north of the study area.12.75%of the regions were evaluated as middle,mainly distributed in the northeast;The area with poor evaluation accounted for 11.06%,distributed in the middle and north of the study area.