摘要
贡嘎山区面积3819平方公里。北坡瓦斯沟及康定附近,东坡大渡河西岸及磨西河流域山崩、滑坡、泥石流、森林雪害等山地灾害严重,人类活动引发的灾害在增长。有关各方应予以重视:凡上建设项目应有前期灾害研究课题,或山地灾害研究人员提供咨询。
Mt. Gongga with an altitude of 7556m,is the first peak of Hengduan Mountains. The mountainous region of Mt. Gongga, located at 101°30′-102°10′E,29°20′-30°00′N,has a area of 3819km2. An area on north slope (including the Wasi Gully,nearby Kangding County Town and the Zeduohe Valley) and east one (including west bank of the Dadu River and the Moxihe Valley )in the region is about 2425km2.Mountain hazards in the region are always more frequent and serious. Large collapse,land-slide(including man-made one),debris flows(including debris flow induced by ice-lake burst,ice-snow-melt and rain debris flow,rainstorm-landslide debris flow,torrents debris flow,and debris flows induced by human activity,etc. )and snow calamity of forest,etc. all occurred and have caused losses in some degrees.There are debris flow gullies of 51,debris flows on precipitous slopes of 23,collapses and landslides of 27 in the region during 1981-1982.A debris flow induced by ice-lake burst at the upper reaches of the Paomashan Gully by the south of Kangding County Town in summer of 1776 buried a part of old Kangding County Town. 7. 5 magnitude of earthquake in the Xinxing Town of Luding County on 1st Jun. 1786 caused a large collapse of the Moganglingand blocked up the Dadu River for 10 days and then burst to result in a flood catastrophe.A ice-snow-melt and rain debris flow occurred in the Nanguan Gully on the left bank of the middle reaches in the Yanzi Gully on 26 Jul. 1989. It belongs to a viscous fluid,weight of the unit volume is 2. 0t/m3 more or less, when it was joining into the Dadu River, the velocity is 9.4m/s, and its discharge is about 6800m3/s,duration is for 2 hours,solid materials washing into the Dadu River are 627×10~4m3,it destroyed a large highway bridge (the Gonghe Bridge with a bridgeopening,a length of 40m,clear height of 10m) across the Yanzi Gully and blocked up the Dadu River, and forced main flow line of the Dadu River towards the left bank,the Luding-Shimian Highway was washed out a length of 820m and cutting off the road is more than 9 months.Frequency occurring of debris flow in the region is a time of decade more or less.All the departments concerned should notice abovmentioned these events and support study of exploration,observation,calculation and prevention to these catastrophic phenomena. In all the large item to be conduction construction,researchers of mountain hazards should participation or provids advisement.
出处
《山地研究》
CSCD
1991年第2期131-135,共5页
关键词
泥石流
滑坡
山地
灾害
贡嘎山
Mt. Gongga, mountain hazards, landslide, debris flow
