Abstract
Debris flow mainly happens in mountainous areas all around the world with deadly social and economic impacts. With the speedy development of the mountainous economy, the debris flow susceptibility evaluation in the mountainous areas is of crucial importance for the safety of mountainous life and economy. Yunnan province of China is one of the worst hitting areas by debris flow in the world. In this paper, debris flow susceptibility assessment of Datong and Taicun gully near the first bend of Jinsha River has been done with the help of site investigation and GIS and remote sensing techniques. Eight causative factors, including slope, topographic wetness index, sediments transport index, ground roughness, basin area, bending coefficient, source material, and normalised difference vegetation index, have been selected for debris flow susceptibility evaluation. Analytical hierarchy process combined with Extension method has been used to calculate the susceptibility level of Datong and Taicun gullies. The evaluation result shows that both the gullies have a moderate susceptibility to debris flow. The result suggests that all the ongoing engineering projects such as mining and road construction work should be done with all precautionary measures, and the excavated material should adequately store in the gullies. Doi: 10.28991/cej-2021-03091702 Full Text: PDF
Highlights
Debris flow is a two-phase fluid composed of soil, rock or organic matter flowing downslope under the influence of gravity
These data and information include geotechnical, geological, hydrogeological, topographical, and rainfall information. (II) The second stage dealt with selecting causative factors based on the field investigation and previous research experiences. (III) In the third stage, the weight and the influencing power of individual parameters in debris flow initiation have been calculated using the Analytical hierarchy process (AHP) method. (IV) the susceptibility level of Datong and Taicun gully was evaluated using the Extension method
The research area is located in the northwest of Yunnan province, which belongs to the upper streams of Jinsha River Tibetan Plateau
Summary
Debris flow is a two-phase fluid composed of soil, rock or organic matter flowing downslope under the influence of gravity. Debris flow can be very rapid and it may happen without any warning, because of this nature debris flow is one of the most hazardous geological disaster. Debris flow usually happens in mountainous areas. With the rapid development of the mountain economy, the demand for soil resources increasing, due to the lack of resource disorders, the circulation zones and accumulated areas generated by debris flow activity is generally comparatively flat, frequently becoming an important place for mountain villages and towns to build, mountain rail, highways, and other transport hubs often choose the large and medium debris flow accumulated areas. Natural disasters in mountainous areas, represented by landslide and debris flow, pose a great threat to human life and property [2,3,4,5]. Debris flow can move the object as big as a building or fill up structures with the fast accumulated deposits and organic material [7, 8]
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