Statistical and probabilistic analyses of impact pressure and discharge of debris flow from 139 events during 1961 and 2000 at Jiangjia Ravine, China

Combined with recent observation data, the paper conclude that the debris flow break-out in high frequency in Jiangjia Ravine, and they belong to rainstorm type, which concentrated in the rainy season, especially during Jun to Aug. As a typical gully of viscous debris flow, the debris flow move with the bed process and obvious feature of surge. The intermittent flow possesses features of high intensity of delivery and long intermittent period. There have obvious relevance between the amount of sediment delivery and the surges of debris-flow break-out at the same year.

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Debris flow warning threshold based on antecedent rainfall: A case study in Jiangjia Ravine, Yunnan, China

Journal of Mountain Science ◽

10.1007/s11629-013-2521-z ◽

2013 ◽

Vol 10 (2) ◽

pp. 305-314 ◽

Cited By ~ 34

Author(s):

Xiao-jun Guo ◽

Peng Cui ◽

Yong Li

Keyword(s):

Debris Flow ◽

Antecedent Rainfall ◽

Jiangjia Ravine

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Fractal characteristic of soil in typical debris flow-triggering region: A case study in Jiangjia Ravine of Dongchuan, Yunnan

Wuhan University Journal of Natural Sciences ◽

10.1007/bf02830177 ◽

2006 ◽

Vol 11 (4) ◽

pp. 859-864 ◽

Cited By ~ 1

Author(s):

Liao Chaolin ◽

He Yurong

Keyword(s):

Debris Flow ◽

Fractal Characteristic ◽

Jiangjia Ravine

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Role of baffle shape on debris flow impact in step-pools channel: an SPH study

10.31224/osf.io/ne5q6 ◽

2021 ◽

Author(s):

Shuai Li ◽

Chong ◽

Wei Wu ◽

shun wang ◽

Xiaoqing Chen ◽

...

Keyword(s):

Debris Flow ◽

Empirical Relation ◽

Three Dimensional ◽

Numerical Results ◽

Impact Pressure ◽

Jet Flows ◽

Flow Density ◽

Particle Hydrodynamics ◽

Pool System ◽

The Impact

Drainage channels with step-pool system are widely used to control debris flow. The blocking of debris flow often gives rise to local damage at the steps and ba?es. Hence, the estimation of impact force of debris flow is crucial for designing step-pools channel. Existing empirical models for impact pressure prediction cannot consider the influence of baffle shape. In this work, a three-dimensional smoothed particle hydrodynamics (SPH) study on the impact behaviour of debris flows in step-pool systems is presented, where debris material is modelled using the regularizedBingham model. The SPH method is first checked using the results from two laboratory tests. Then it is used to investigate the influence of bafflee shape and flow density. Numerical results show that the impact pressure at the first ba?e highly depends on the ba?e shape; however, the largest impact pressure usually occurs at subsequent baffles due to the violent impact induced by jet flows. The peak impact pressure at the first ba?e initially grows with increasing flow density; however, it starts to drop as density is beyond a threshold. Based on the numerical results, an empirical relation considering the influence of ba?e shape is proposed for better prediction of debris impact pressure.

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