Susceptibility Assessment of Single Gully Debris Flow Based on AHP and Extension Method

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

Hazard assessment of potential debris flow: A case study of Shaling Gully, Lingshou County, Hebei Province, China

“…The susceptibility of debris flow is commonly referred to as the occurrence probability of a debris flow. Currently, the susceptibility is basically evaluated by the direct index evaluation method, which is a subjective judgement, or indirect index evaluation method, which is widely used by most scholars (Li et al, 2020;Sujatha, 2020;Mehmood et al, 2021;Jingbo et al, 2021). In this paper, the indirect index evaluation method was selected to estimate the susceptibility of debris flow in Shaling Gully.…”

“…The indirect index evaluation method always selects the terrain, source and rainfall as evaluation factors, and then the selected factors are normalized and weighted (Jun et al, 2017;Li et al, 2021a). In this paper, the AHP (Analytic Hierarchy Process) method was used to evaluate these factors (Mehmood et al, 2021).…”