Numerical simulation of deposit in confluence zone of debris flow and mainstream

Chen, Ridong; Liu, Xingnian; Cao, Shuyou; Guo, Zhixue

doi:10.1007/s11431-011-4510-1

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…19 At the beginning of the computation, the river channel is treated as being dry. As described by 633 Chen et al (2011), in order to obtain a good-shaped wet-dry boundary line, a minimum 634 threshold water depth min h is used. A node is regarded as being dry when its water depth is 635 less than min h , otherwise it is marked as being wet.…”

Section: R Is 163mentioning

confidence: 99%

Water–sediment flow modeling for field case studies in Southwest China

2015

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The paper presents a highly robust numerical model to simulate water-sediment mixture flows in practical field studies. The model is composed of an integrated algorithm combining the finite element characteristic splitting method and finite volume Godunov scheme. The former maintains the generality and stability of the numerical algorithm while the latter ensures the conservation and accuracy of the model. The proposed model is first tested by three benchmark flow problems including flood flow in a pool, dam break over a mobile bed and morphological process of a dam removal. Then the model is applied to two practical field case studies to demonstrate its potential engineering values. The first case study is related to the damage of the Polo Hydropower Plant by a sediment flooding event. The second one is the investigation of a well-known 2013 dam break flooding that happened in the Tangjiashan Mountain. It is shown that the simulated water and sediment flows are in good agreement with the documented laboratory and field data and the numerical model is capable of providing useful information on the flow predictions thus making further engineering measures to mitigate these disasters.

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Section: R Is 163mentioning

confidence: 99%

Water–sediment flow modeling for field case studies in Southwest China

2015

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“…Owing to the complexity of the interactions between the incoming solid‐liquid mixture conveyed by the debris flow and the receiving water current, attempts to tackle the problem numerically are still in an early stage [ Chen et al ., ; Chen and Peng , ; Chen et al ., ]. Debris flow and water flow are simulated independently, and the interaction between the two types of flows is accounted for in a simplified manner [ Chen et al ., , 2013]. The geometry of deposition fans has then been studied experimentally, with particular attention to the case of a single confluence.…”

Section: Introductionmentioning

confidence: 99%

Propagation and deposition of stony debris flows at channel confluences

Stancanelli

Lanzoni

Foti

2015

Water Resources Research

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The fluid dynamics of stony debris flows generated in two small tributaries adjacent to each other and flowing into a main receiving channel was analyzed experimentally at a laboratory scale. The analysis on the propagation along the tributaries and deposition in the main channel provide information about sediment-water mobility, dangerous damming, and potential hazard. Debris flows were generated by releasing a preset water discharge over an erodible layer of saturated gravels material. As a consequence, the debris flow sediment concentration varied accordingly to the entrainment rate which, in turn, was strongly controlled by the tributary slope. The data collected by acoustic level sensors, pore fluid pressure transducers, and a load cell were used to characterize the evolution of bulk density and solid concentration of the sediment-water mixture. These two parameters were relevant to assess the stony debris flow mobility which contributes to determine the shape of sediment deposits in the main channel. The detailed bed topography surveys carried out in the main channel at the end of each experiment provided information on the morphology of these deposits and on the interplay of adjacent confluences. The influences of confluence angle, tributary slopes, and triggering conditions have been investigated, for a total of 18 different configurations. Within the investigated range of parameters, the slope angle was the parameter that mainly influences the stony debris flow mobility while, for adjacent confluences, the degree of obstruction within the receiving channel was strongly influenced by the triggering scenario.

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“…The process of river blocking induced by debris flows is essentially a complex process of interactions between Newtonian fluid (water) and non-Newtonian fluid (debris flows) (Chen et al, 2011;Maria et al, 2014;Stancanelli et al, 2015). Through flume experiments, we can have an intuitive preliminary understanding of the process of debris flows blocking the river.…”

Section: Experimental Study Of River Blockingmentioning

confidence: 99%

Review of Investigations on Hazard Chains Triggered by River-Blocking Debris Flows and Dam-Break Floods

Chen

Ruan²,

Chen³

et al. 2022

Front. Earth Sci.

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The Tibetan Plateau suffers from various types of geohazards (collapses, landslides, and debris flows.) due to abrupt changes in complex topography and weather conditions. Global warming and frequent high-intensity earthquakes in recent years have exacerbated the situation. Collapses and landslides provide vast amount of soil and debris which are conveyed downstream by runoff caused by extreme rainfalls to form large-scale debris flows; then, the debris flows block rivers and finally form dam-break floods, that is, a hazard chain triggered by debris flows. Along the evolution direction of the hazard chain, the affected areas are constantly amplified. This study first summarizes the related research studies on river blockage, debris-flow dam failure, and the hazard chain triggered by debris flows and then points out the drawbacks of existing research studies. Overall, the research (including mechanism, risk assessment, key prevention, and control technologies) on the hazard chain triggered by debris flows is still in its infancy and is disconnected among single hazard types in the hazard chain; meanwhile, the understanding of the mechanism of debris flow blocking the river is not enough; the established model and discriminant have minimal application scope, and there is no empirical model and dynamic model of debris-flow dam failure. Finally, several key scientific issues of this field were raised: 1) it is necessary to elaborate the coupling mechanism of debris-flow dam formation and construct the discriminant and numerical model of debris flow blocking the river with high precision and a wide application range. 2) It is necessary to further study the failure mechanism of a debris-flow dam, construct the numerical model of the failure process of a debris-flow dam, and accurately simulate the outburst flood hydrograph. 3) It is necessary to clarify the critical transformation conditions and dynamic evolution process of the hazard chain caused by debris flows, complete the accurate quantitative simulation of the whole disaster chain process, then establish a complete risk assessment system of the hazard chain, and finally develop some key prevention and control technologies suitable for the hazard chain.

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Numerical simulation of deposit in confluence zone of debris flow and mainstream

Cited by 13 publications

References 9 publications

Water–sediment flow modeling for field case studies in Southwest China

Water–sediment flow modeling for field case studies in Southwest China

Propagation and deposition of stony debris flows at channel confluences

Review of Investigations on Hazard Chains Triggered by River-Blocking Debris Flows and Dam-Break Floods

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