Effect of vegetation on debris flow mitigation
Back ground and aims This research is focused in southern Gansu Province,the north-eastern edge of the Tibetan Plateau where landslides and debris flows are extremely frequent and severe.The region is characterized with high relative relief generally ranging from several hundred to three thousand metres,huge catchment areas popularly over several tens of kilometers,and fragmented soft metamorphic rocks which provide enormous loose materials to the valley bottoms often over tens of metres in depth,ready to be transported by floods forming heavy debris flows.Any check dams,even as high as 30 metres are incapable to cope with the specific natural conditions,and vulnerable to collapse in an extreme event,such as the 2010 Zhouqu debris flow having destroyed 13 check dams and killed 1756 people.However,civil engineering constructions are still the majour means of mitigation measures being popularly employed nationwide,some of which are proved have short life span and misuse of these structures may sometimes aggravate the disasters.Therefore,other measures must be developed and put into practices in order to better preventing the vigorous hazards.Given that the deteriorated local bio-environment and the intensified soil erosion including mass movements in southern Gansu are primarily due to the deforestation since 1950s,and the mechanical effects of plants in reinforcing soils,slopes or river banks have been successful in many other regions in the world,this research is to explore the capacity and effectiveness of plant roots in reinforcing loose materials in debris flow valleys,aiming to reduce their activities.
Xingmin Meng Siyuan Wang Dongxia Yue Jinhui Ma Shengli Yang Guan Chen
The Key Laboratory of Western Chinas Environmental Systems, Ministry of Education(MOE), Lanzhou University, Lanzhou, Gansu Province, 730000, China
国际会议
成都
英文
33-36
2015-05-09（万方平台首次上网日期，不代表论文的发表时间）