用模糊综合评判法优选大射电望远镜候选台址

贵州大射电望远镜候选台址优选,需综合考虑喀斯特洼地几何条件、工程条件、地质条件、气象条件和无线电环境等因素.因上述各因素具复杂性、模糊性和难量化性等特点,本文采用模糊综合评判法进行大射电望远镜候选台址优选.经研究,大射电望远镜候选台址优评价指标可取"长短轴比、最小挖填方率、最适宜口径、洼地闭合情况、岩体结构、地质灾害、洼底水文条件、交通状况"等8个参数,综合评判结果集为"好、较好、一般、差".采用专家评定法和降半梯形分布相结合的隶属度评价模型,共选出38个大射电望远镜候选台址.它们集中分布于三大区域内:一是以平塘、紫云、惠水、罗甸、荔波为中心区域;二是以普定、安顺、镇宁为中心区域;三是以安龙、兴义和关岭为中心区域.

OPTIMIZING FAST SITES BY THE FUZZY COMPREHENSIVE JUDGEMENT IN GUIZHOU, CHINA

Due to the complicity,fuzziness and non-quantity of these factors,such as the depression geometry,engineering and geological conditions,climate and radio interference environment,optimizing the potential sites for the five-hundred-meter aperture spherical telescope(FAST) project in Guizhou karst region is not an easy job.In this paper,FAST sites are proposed by the fuzzy comprehensive judgement,whose evaluation indexes include ratio of the depression's major axis to the minor axis,minimum ratio of the volume of excavation to fillings,the volume of FAST spherical cap,optimum diameter,closing condition,rock mass,geohazard,hydrographic conditions and traffic distance.Its target is described by excellent,fine,general and inferior.Its membership grade model is composed of expert consulting system and semi-trapezoidal function.The research results show that there are over 38 karst depressions suitable for FAST,most of them are centrally located in the following regions: the first in PingTang,ZiYun,HuiShui,LuoDian and LiBo counties,the second in PuDing,AnShun,ZhengNing,and the third in AnLong,XingYi and GuanLing counties.