长吉图经济区地质灾害易发性区划研究

利用地质灾害综合危险性指数法对长吉图经济区崩塌、滑坡、泥石流等环境地质灾害的易发性进行分区. 研究区内诱发地质灾害最主要的因素是降水, 其次为地形地貌. 和龙市、龙井市、延吉市、珲春市、安图县部分地区、汪清县嘎呀河上游沿岸以及长白山天池周边等地为崩塌、滑坡、泥石流等地质灾害高易发区, 约占研究区总面积的22. 31%, 共有地质灾害点726处, 平均密度为4. 52个/100 km²; 蛟河市、永吉县、敦化市、汪清县等低山丘陵地区为崩塌、滑坡、泥石流地质灾害中易发区, 约占研究区总面积48. 10%, 共有地质灾害点671处, 平均密度为1. 94个/100 km²; 伊通县、吉林市、长春市、德惠县、农安县一带为崩塌、滑坡、泥石流地质灾害低易发区, 约占研究区总面积29. 59%, 共有地质灾害点157处, 平均密度为0. 74个/100 km².

VULNERABILITY ZONING OF MAIN GEOLOGICAL HAZARDS IN CHANGCHUN-JILIN-TUMEN ECONOMIC ZONE

The synthetic risk index method is used for the vulnerability zoning of environmental geological hazards such as collapse, landslide and debris flow in Changchun-Jilin-Tumen Economic Zone. Precipitation is the most important factor inducing geohazards in the region, followed by topography and landform. Helong City, Longjing City, Yanji City, Hunchun City, part of Antu County, the upper reaches of Gaya River in Wangqing County and surrounding area of Tianchi Lake in Changbai Mountain are highly prone to the above geohazards, accounting for 22. 31% of the study area, with 726 geohazard sites and average density of 4. 52 sites per 100 km²; Low hilly areas such as Jiaohe City, Yongji County, Dunhua City and Wangqing County belong to medium susceptible area, accounting for about 48. 10% with 671 geohazard sites and average density of 1. 94 sites per 100 km²; Yitong County, Jilin City, Changchun City, Dehui County and Nong'an County are of low susceptible areas, accounting for about 29. 59% with 157 geohazard sites and average density of 0. 74 site per 100 km².