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- Title
Numerical simulation for viscous debris flows passing through dams—a case study of the Wenchuan Yinxingping gully.
- Authors
Liu, Jinfeng; Jiao, Liang; Yang, Huaquan; You, Yong; Zhang, Wentao
- Abstract
Check dams, which mitigate debris flow hazards, have been widely applied in mountainous areas. Usually, it is difficult to assess the effectiveness of these mitigation works. With the use of numerical simulation, considering the influence of dynamic processes and fine-particle cohesion, the variation in characteristic parameters when viscous debris flows pass through dams can be calculated accurately. In this paper, a new method for quantitative assessment of check dams against viscous debris flow is proposed. Based on the two-phase flow theory of viscous debris flows, considering the effect of solid and liquid frictional gradients, the influence of dynamic processes, and fine-particle cohesion, a flow simulation model of viscous debris flows is established. To facilitate engineering applications, with this model adopted as a theoretical basis, a debris flow graphical user interface (GUI) simulation tool, i.e., Debrisflow 1.0, is developed in Visual Basic.NET on the Microsoft Visual Studio (VS) platform. Moreover, the Yinxingping gully in the Yinxing Township, Wenchuan County, Sichuan Province, China, is selected as an example. Debrisflow 1.0 is employed to simulate the dynamic processes of debris flows, such as silting behind the dam and overflowing of the dam, and the control effect of an existing check dam is quantitatively assessed. The results show that the discharge control efficiency of the existing check dam is 47.51%, and combined with an analysis of observations of the mitigation works during different periods, a problem is identified regarding the insufficient storage capacity design of the check dam in the Yinxingping gully.
- Subjects
SICHUAN Sheng (China); DEBRIS avalanches; VISCOUS flow; GRAPHICAL user interfaces; FLOW simulations; COMPUTER simulation; RESERVOIRS; DAMS
- Publication
Landslides, 2021, Vol 18, Issue 9, p3255
- ISSN
1612-510X
- Publication type
Article
- DOI
10.1007/s10346-021-01708-3