Study on hydraulic characteristics of sabo dam with a flap structure for debris flow

Kim, Yeon-Joong; Nakagawa, Hajime; Kawaike, Kenji; Zhang, H.

doi:10.1016/j.ijsrc.2017.05.001

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…The idea of installing bottom drainage screens along the propagation path of debris flows to reduce their impact was proposed by Hashimoto in Japan in the 1950s Kiyono et al (1986); Gonda (2009). Due to the effectiveness of this energy dissipating structure, several small-scale physical models have been conducted to have a better understanding of debris-flow screens and their mechanism including (i) the effects of different opening widths of permeable screens on the debris-flow run-out distance Gonda (2009), (ii) the effects of different bed sediments with different blocking and opening widths Kim (2013) and (iii) the effects of different location of debris flow screens, in the middle or at the end of propagation path, on the behaviour of debris flows Yifru et al (2018).…”

Section: Reducing the Impact Of The Debris Avalanchementioning

confidence: 99%

Two-phase SPH modelling of a real debris avalanche and analysis of its impact on bottom drainage screens

et al. 2021

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Rapid flow-like landslides, particularly debris flows and debris avalanches, cause significant economic damage and many victims worldwide every year. They are usually extremely fast with the capability of travelling long distances in short times, sweeping away everything in their path. The principal objective of this paper is to test the ability of the ‘GeoFlow-SPH’ two-phase model developed by the authors, to reproduce the complex behaviour of natural debris avalanches where pore-water pressure evolution plays a key role. To reach this goal, the model is applied to reproduce the complex dynamic behaviour observed in Johnsons Landing debris avalanche including the observed bifurcation caused by the flowing out of part of the moving mass from the mid-channel. Initial thickness deposit trim-line, distribution of deposit volume, and the average velocities were provided for this real case, making it an appropriate case to validate the developed model. The paper also contributes to evaluate the SPH-FD model’s potentialities to simulate the structural countermeasure, like bottom drainage screens, used to reduce the impact of debris flows. The analysis of the results shows the adequacy of the proposed model to solve this complicated geophysical problem.

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Section: Reducing the Impact Of The Debris Avalanchementioning

confidence: 99%

Two-phase SPH modelling of a real debris avalanche and analysis of its impact on bottom drainage screens

et al. 2021

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“…To understand the formation process of the debris flow, this study uses a numerical simulation of debris flow analyse the mechanism and hydraulic characteristics of the interaction for real basins. A 2-D numerical analysis model is developed to analyse for onsite applications based on an existing 2-D numerical model [Kim, 2013b].…”

Section: Numerical Modelmentioning

confidence: 99%

Debris Flow Prevention Countermeasures with Urban Inundation in a Multihazard-Environment

Kim

Tanaka

Nakashima

et al. 2016

IJECE

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Natural disasters can strike without notice at any time, anywhere. Also these disasters can occur in multiple locations between high and low mountainous areas simultaneously with flooding in urban areas caused by heavy rainfall. However, it is becoming more and more difficult to predict heavy rainfall, and intensive rainfall could become more frequent in the future due to climate change. In order to reduce these impending disasters more effectively, it is necessary to investigate what causes the damage with an integrated model of disasters at once, and to adequately predict rainfall. The main objectives of this study are to evaluate the maximum forecast rainfall by a depth-area-duration analysis, to analyses the debris flow during urban inundation in a real basin, and to estimate the risk evaluation index according to two-dimensional debris flow with two-dimensional urban inundation models. Finally, the establishment of an evacuation time scenario is proposed, and multihazard risk and evacuation route maps combining both disasters are created using a geographic information system. The peak precipitation is estimated at 135mm/hr of torrential rainfall, and the maximum total rainfall is estimated at 544mm of typhoon-related rainfall at Ono, Japan, using depth-area-duration analysis.

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“…Many research efforts have been dedicated to evaluating the performance of debris-flow barriers based on physical and numerical modeling. The small-scale physical modeling has advantages of being repeatable, but reproducing real debris flows with consideration of proper rheological characteristics and entrainment is a daunting task [7][8][9][10][11]. Numerical approaches have been mainly employed to develop numerical models and software to accurately describe and predict debris-flow behaviors [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Case Study on the Closed-Type Barrier Effect on Debris Flows at Mt. Woomyeon, Korea in 2011 via a Numerical Approach

Choi

Kwon

2021

Energies

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Debris flows are capable of flowing with high velocities and causing significant economic and infrastructural damage. As a hazard mitigation measure, physical barriers are frequently installed to dissipate the energy of debris flows. However, there is a lack of understanding on how barriers affect and interact with debris-flow behavior (e.g., velocity and volume). This study investigated the changes in debris-flow characteristics depending on the installation location of barriers. Mt. Woomyeon, which is located in Seoul, Korea, was the site of a major debris-flow event in 2011. This study modeled this event using DAN3D, numerical software based on smoothed particle hydrodynamics (SPH). Our numerical approach assessed changes in debris-flow behavior, including velocity and volume, as the debris flow interacts with four closed-type barriers installed at separate points along the flow path. We used DAN3D to model the barriers via terrain elevation modifications. The presence of a closed-type barrier results in the reduction in the debris-flow velocity and volume compared to when no barrier is present. Most notably, the closer a barrier is installed to the debris source, the greater the velocity decrease. By contrast, a barrier that is constructed further downstream allows the debris flow to undergo entrainment-driven growth before confronting the barrier, resulting in a larger debris deposition volume that can often cause overflow, as shown at our particular study site. The presented results highlight the effectiveness of barriers as a method of hazard mitigation by providing insight into how such installations can alter debris-flow behavior. In addition, the findings can provide a reference for future debris-flow barrier designs, increasing the effectiveness and efficiency of such barrier systems.

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Study on hydraulic characteristics of sabo dam with a flap structure for debris flow

Cited by 10 publications

References 9 publications

Two-phase SPH modelling of a real debris avalanche and analysis of its impact on bottom drainage screens

Two-phase SPH modelling of a real debris avalanche and analysis of its impact on bottom drainage screens

Debris Flow Prevention Countermeasures with Urban Inundation in a Multihazard-Environment

A Case Study on the Closed-Type Barrier Effect on Debris Flows at Mt. Woomyeon, Korea in 2011 via a Numerical Approach

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