| Citation: | Liang Yang, Yang Wang, Kang Liao, Longfei Zhang, Aiyun Chen, Juan Du. Initiation and Kinematic Process of Debris Flow with the Existence of Terraced Fields at the Sources. Journal of Earth Science, 2024, 35(5): 1613-1625. doi: 10.1007/s12583-022-1633-1
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A debris flow, with terraced fields as the source area, broke out on June 25th, 2018 in the Xiaotuga area of Yunnan Province, China, and this kind of debris flow is rarely recorded. Two purposes in this study: (1) the influence of flow drag force on slope stability; (2) back-analyze the movement process of debris flow. First, the geological background and movement of this debris flow were described based on a field investigation. Then, drag force, calculated by the laminar flow theory, is added to the slope stability calculation model, which elaborates the initiation process of this disaster. Moreover, dynamic simulation software (DAN3D) was used to simulate the kinematic process of the debris flow with a variety of combination models. The study shows that the terrace area can quickly produce surface runoff and create a drag force under rainfall conditions, which is the essential reason for the initiation of debris flow. In addition, the use of the FVV (Frictional-Voellmy-Voellmy) model is found to provide the best performance in simulating this type of debris flow, which reveals that it lasts approximately 200 s and that the maximum velocity is 12 m/s.
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