A probabilistic view of debris flow

Li, Yong; Su, Peng; Cui, Peng; Hu, Kaiheng

doi:10.1007/s11629-008-0111-2

Cited by 10 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, some of them have the happening possibilities of debris flow. Cui (1991) and Li (2002 approved that debris flow occurs only in some special phase in the evolution history of a catchment. If a catchment enters such a special phase but no debris flow records, the gully should be a potential debris flow gully.…”

Section: Definition Of Potential Debris Flow Gullymentioning

confidence: 99%

Potential Debris Flow Gully and its Discrimination — A Case Study in Wenchuan Earthquake Hit Areas

Chen

You

Liu

2012

AMR

View full text Add to dashboard Cite

In this paper, we firstly defined the potential debris flow gully. And then using the data of different gullies in Wenchuan earthquake hit areas, we built a discrimination model of potential debris flow gully by Fisher Linear Discrimination Analysis method. Finally, the model was used to discriminate the gullies in Jinxihe catchment, in Anxian County. Potential debris flow gully is a kind of special gully which is in a special evolution phase of the gully when the gully has the happening possibilities of debris flow but no debris flow records. Because potential debris flow can often pose more serious disasters, discrimination of potential debris flow gully is important for disaster prevention and mitigation. To build discrimination model of potential debris flow gully, a database of different gullies in quake-hit areas was established and six discrimination indices were selected based on cause analysis of debris flow. Using the database and the six discrimination indices, we built the discrimination model by Fisher Linear Discrimination Analysis method. The discrimination model was used to discriminate the gullies in Jinxihe catchment. Discrimination results showed that the discrimination model was effective and feasible in discriminating potential debris flow gullies, but it still needs further revised and perfected.

show abstract

Section: Definition Of Potential Debris Flow Gullymentioning

confidence: 99%

Potential Debris Flow Gully and its Discrimination — A Case Study in Wenchuan Earthquake Hit Areas

Chen

You

Liu

2012

AMR

View full text Add to dashboard Cite

show abstract

“…Previous studies on dam-break mainly focused on the prediction of peak discharge, evolution of the debris flows towards the downstream area and their propagation after a dam-break. From the insights made by Saint Venant equations in 1871 to Ritter's first calculation formula of dam-breaking flow in 1892, Stoker extended Ritter's formula investigating the debris flow propagation in the downstream area, and since then, several studies have been conducted to provide a better understanding of this phenomenon or to characterize single features typical of each region and environmental condition [8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Debris Flows Induced by Dam-Break Using the Smoothed Particle Hydrodynamics (SPH) Method

et al. 2020

View full text Add to dashboard Cite

Dam-break flows may change into debris flows if certain conditions are satisfied, such as abundant loose material and steep slope. These debris flows are typically characterized by high density and can generate strong impact forces. Due to the complexity of the materials that they are made of, it has always been very challenging to numerically simulate these phenomena and accurately reproduce experimentally debris flows’ processes. Therefore, to fill this gap, the formation-movement processes of debris flows induced by dam-break were simulated numerically, modifying the existing smoothed particle hydrodynamics (SPH) method. By comparing the shape and the velocity of dam break debris flows under different configurations, it was found that when simulating the initiation process, the number of particles in the upstream section is overestimated while the number of particles in the downstream area is underestimated. Furthermore, the formation process of dam-break debris flow was simulated by three models which consider different combinations of the viscous force, the drag force and the virtual mass force. The method taking into account all these three kinds of interface forces produced the most accurate outcome for the numerical simulation of the formation process of dam-break debris flow. Finally, it was found that under different interface force models, the particle velocity distribution did not change significantly. However, the direction of the particle force changed, which is due to the fact that the SPH model considers generalized virtual mass forces, better replicating real case scenarios. The modalities of dam failures have significant impacts on the formation and development of debris flows. Therefore, the results of this study will help authorities to select safe sites for future rehabilitation and relocation projects and can also be used as an important basis for debris flow risk management. Future research will be necessary to understand more complex scenarios to investigate mechanisms of domino dam-failures and their effects on debris flows propagation.

show abstract

“…Benda et al (1990) synthesized some field observations related to the geometry of stream junctions into a simple relation for predicting travel distance and volume of debris flows in confined mountain channels. Li et al (2008) proposed a probabilistic approach to assess the risk of a gully area. More specifically, the occurrence of an obstruction in the mainstream is associated with the probability of confluence of tributary flows, carrying out a certain amount of debris flow discharge, and with the size of valley hosting the mainstream.…”

Section: Introductionmentioning

confidence: 99%

Mutual interference of two debris flow deposits delivered in a downstream river reach

2014

View full text Add to dashboard Cite

We investigate experimentally the\ud depositions of two contiguous debris flows flowing\ud into a main river reach. The aim of the present\ud experimental research is to analyze the geometry and\ud the\ud mutual interactions of debris flow deposits\ud conveyed by these tributaries in the main channel. A\ud set of 19 experiments has been conducted considering\ud three values of the confluence angle, two slopes of the\ud tributary, and three different triggering conditions\ud (debris flows occurring simultaneously in\ud the\ud tributaries, or occurring first either in the upstream or\ud in the downstream tributary). The flow rate along the\ud main channel was always kept constant. During each\ud experiment the two tributaries had the same slope\ud and confluence angle. The analysis of the data\ud collected during the experimental tests indicates that\ud the volume of the debris fan is mainly controlled by\ud the slope angle, as expected, while the shape of the\ud debris deposit is strongly influenced by the confluence\ud angle. Moreover, in the case of multiple debris flows,\ud the\ud deposit shape is sensitive to the triggering\ud conditions. Critical index for damming formation\ud available in literature has been considered and\ud applied to the present case, and, on the basis of the\ud collected data, considerations about possible\ud extension of such indexes to the case of multiple\ud confluences are finally proposed

show abstract

A probabilistic view of debris flow

Cited by 10 publications

References 16 publications

Potential Debris Flow Gully and its Discrimination — A Case Study in Wenchuan Earthquake Hit Areas

Potential Debris Flow Gully and its Discrimination — A Case Study in Wenchuan Earthquake Hit Areas

Numerical Modeling of Debris Flows Induced by Dam-Break Using the Smoothed Particle Hydrodynamics (SPH) Method

Mutual interference of two debris flow deposits delivered in a downstream river reach

Contact Info

Product

Resources

About