Debris Flow Characteristics in Flume Experiments Considering Berm Installation

Chang, Hyungjoon; Ryou, Kukhyun; Lee, Hojin

doi:10.3390/app11052336

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…It was evident that the distribution of sediment deposition in terms of total volume was influenced by the inclination of the flume and indicated that when θ d is increased, there is a clear correlation with a decrease in the volume of deposits present on the board. In a study conducted by [39], the experimental findings provided support for the idea that as the channel slope, which represents the flume inclination, increased, the total travel distance of debris flow also increased. Aside from flume inclination, fluid volume also showed a significant association with V T (r = −0.260, p < 0.05), V out (r = 0.783, p < 0.01), P A (r = −0.210, p < 0.05), S A (r = −0.210, p < 0.05), Ψ (r = −0.285, p < 0.05), H p (r = 0.107, p < 0.05), and P B (r = −0.210, p < 0.05).…”

Section: Discussionmentioning

confidence: 80%

Assessment of Debris Flow Impact Based on Experimental Analysis along a Deposition Area

A.Wahab,

Mohd Arif Zainol,

Ikhsan

et al. 2023

Sustainability

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Debris flow is a devastating phenomenon that happens in hilly and mountainous regions and has a serious impact on affected areas. It causes casualties and serious damage to the environment and society. Therefore, a susceptible assessment is necessary to prevent, mitigate, and raise awareness of the impact of debris flows. This paper focuses on evaluating the deposition area along the deposition board. The methodology involved an experiment on a physical model by demonstrating the debris flow based on the steepness of the flume slope at 15°, 20°, and 25° angles. The limestone particles with a total volume of 2.5 × 106 mm3 acted as debris and were released with water from the tank to the deposition board with an area of 10 × 105 mm2. The volume, area, and length of particle distribution carried from the flume to the deposition board were then determined. Based on the experimental results, the deposition board is covered with particles of about 696.19 × 103 mm3, 748.29 × 103 mm3, and 505.19 × 103 mm3 volume for each 15°, 20°, and 25° angle, respectively. In actual situations, debris flow is capable of causing significant risk to the affected area. This study can be deemed useful for a risk assessment approach, to help develop guidelines, and to mitigate the regions where debris flows are most probable to occur.

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Section: Discussionmentioning

confidence: 80%

Assessment of Debris Flow Impact Based on Experimental Analysis along a Deposition Area

A.Wahab,

Mohd Arif Zainol,

Ikhsan

et al. 2023

Sustainability

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“…In the upper reaches of the Jinsha River, there are 32 debris flow gullies between the engineering area of the Benzilan Hydropower Station and that of the Xulong Hydropower Station alone, posing a substantial threat to construction and operation of existing and planned hydropower Water 2023, 15, 2072 2 of 17 projects [2]. Therefore, predicting the run-out process and extent of debris flow is important for disaster prevention and mitigation for hydropower projects in the deep-cutting canyon area of Southeast Tibet [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Debris Flow Run-Out Prediction Based on the Shallow-Water Flow Numerical Model—A Case Study of Xulong Gully

Liu

Zhang

Guo

et al. 2023

Water

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Here we present a method for predicting debris flow run-out based on a numerical model for shallow water flows, using a case study conducted on Xulong Gully, a proposed dam site for a hydropower station in the upper reaches of the Jinsha River. A field investigation and remote sensing interpretation methods were used to develop a comprehensive evaluation of debris flow zones and calculate the potential provenance volume in the Xulong Gully. Particle-size analysis was conducted on the early debris flow fan in the Xulong Gully to determine the rheological properties of the debris flow materials. A numerical model for shallow flows was constructed using the finite volume method to verify fluid motion across complex terrain and explore the debris flow run-out range with various provenance volumes. The model showed that for a total debris flow volume of less than two million m3, the debris flow impact area would remain within the Xulong Gully. However, if the total debris flow volume is more than two million m3, the debris flow would flush out into the Jinsha River, blocking a portion of the river. If all the provenance in the Xulong Gully were flushed out, the maximum flow velocity of the generated debris flow would be 11 m/s and the thickness of the debris flow at the Xulong Gully estuary would be about 28.8 m. The debris flow would completely block 470 m of the Jinsha River.

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Laboratory Analysis of Debris Flow Characteristics and Berm Performance

Ryou

Chang

Lee

2021

Water

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In this study, laboratory tests were used to determine the deposition characteristics (runout distance, lateral width, and deposition area) of debris flow and their relationships with the flow characteristics (flow velocity and flow depth) according to the presence of a berm. An experimental flume 1.3 to 1.9 m long, 0.15 m wide, and 0.3 m high was employed to investigate the effects of channel slope and volumetric concentration of sediment with and without the berm. The runout distance (0.201–1.423 m), lateral width (0.045–0.519 m), and deposition area (0.008–0.519 m2) increased as the channel slope increased and as the volumetric concentration of sediment decreased. These quantities also increased with the flow velocity and flow depth. In addition, the maximum reductions in the runout distance, lateral width, and deposition area were 69.1%, 65.9%, and 93%, respectively, upon berm installation. The results of this study illustrate general debris flow characteristics according to berm installation; the reported relationship magnitudes are specific to the experimental conditions described herein. However, the results of this study contribute to the design of site-specific berms in the future by providing data describing the utility and function of berms in mitigating debris flow.

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Debris Flow Characteristics in Flume Experiments Considering Berm Installation

Cited by 3 publications

References 30 publications

Assessment of Debris Flow Impact Based on Experimental Analysis along a Deposition Area

Assessment of Debris Flow Impact Based on Experimental Analysis along a Deposition Area

Debris Flow Run-Out Prediction Based on the Shallow-Water Flow Numerical Model—A Case Study of Xulong Gully

Laboratory Analysis of Debris Flow Characteristics and Berm Performance

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