四川泸定县城后山泥石流灾害及其风险防御

四川泸定县城后山分布有3条泥石流沟,分别为孙家沟、牧场沟和羊圈沟.这3条沟谷曾多次暴发泥石流,对泸定县城造成了严重的危害和威胁.在现场考察基础上,论述了泸定县城后山泥石流沟的分布及泥石流危害,从物源、地形地貌和降雨3个方面分析了泥石流成因,从发生时间、空间和规模3个方面论述了泥石流灾害特征,从防灾体系、监测体系、抗灾体系、报警体系、响应体系和恢复体系6个方面建立了泸定县城后山泥石流防御体系,进而有针对性地提出了泸定县城后山泥石流的防治建议.

Debris flow hazards behind Luding County seat, Sichuan Province, and the corresponding risk countermeasures

Three debris flow gullies,i.e.,Sunjia,Muchang and Yangjuan,are distributed along the mountains behind Luding County seat,Sichuan Province.In the past years,debris flows frequently occurred and serious damaged and threat Luding County seat.In this paper,the distribution of debris flow gullies and some disaster events are described,their formation conditions such as solid materials,landform and rainfall are analyzed,and their occurrence characteristics are discussed in the aspects of time,space and magnitude....