Quantitative investigation of sediment regulation performance of slot-check dam on viscous debris flow

2021 ◽  
Vol 14 (14) ◽  
Author(s):  
Jinfeng Liu ◽  
Huaquan Yang ◽  
Wenbing Zhou ◽  
Yong You ◽  
Hao Sun ◽  
...  
Keyword(s):  
Debris Flow ◽  
Check Dam ◽  
Quantitative Investigation ◽  
Viscous Debris Flow

Efficiency of Slot-Check Dam Group on Debris Flow Control in Shengou Basin, Kunming, China

2014 ◽  
pp. 37-43 ◽  
Author(s):  
Yuhua Zou ◽  
Kaiheng Hu ◽  
Xiaoqing Chen ◽  
Wei Zhong
Keyword(s):  
Debris Flow ◽  
Flow Control ◽  
Check Dam

scholarly journals A Condition of Occurrence On The Roll Waves Of Viscous Debris Flow

2004 ◽  
Vol 7 ◽  
pp. 813-820 ◽  
Author(s):  
Muneyuki ARAI ◽  
Xuelan LIU ◽  
Nobuhiko TAHARA
Keyword(s):  
Debris Flow ◽  
Roll Waves ◽  
Viscous Debris Flow

The optimal cross-section design of the “Trapezoid-V” shaped drainage canal of viscous debris flow

2011 ◽  
Vol 8 (1) ◽  
pp. 103-107 ◽  
Author(s):  
Yong You ◽  
Huali Pan ◽  
Jinfeng Liu ◽  
Guoqiang Ou
Keyword(s):  
Debris Flow ◽  
Cross Section ◽  
Drainage Canal ◽  
Viscous Debris Flow ◽  
Section Design

scholarly journals Glacier lake outburst floods of the Guangxieco Lake in 1988 in Tibet, China

2013 ◽  
Vol 1 (5) ◽  
pp. 4605-4634 ◽  
Author(s):  
J. J. Liu ◽  
Z. L. Cheng ◽  
Y. Li
Keyword(s):  
Global Warming ◽  
Debris Flow ◽  
Satellite Images ◽  
High Elevation ◽  
Viscous Debris Flow ◽  
Outburst Floods ◽  
Glacial Lake Outburst Floods ◽  
Ice Avalanche ◽  
Archive Material

Abstract. Glacial lake outburst floods (GLOFs) have become more frequent and attracted more and more attention under conditions of global warming. However, there are few observations of the reasons for outbursts and their processes because of their unexpected occurrence and their inaccessible location in high-elevation areas. The GLOF of the Guangxieco Lake, which is the only outburst lake below an elevation of 4000 m in Tibet, provides a case study for discussing the reasons for outbursts. This paper reconstructs the process in detail using geomorphological evidence, interviews of the local inhabitants, archive material and satellite images. It was found that: (1) There were three main reasons for the GLOF in 1988: intense pre-precipitation and persistent high temperatures before the outburst, ice avalanche by rapid movement of the Gongzo Glacier and low self-stability of the end-moraine dam by perennial piping. (2) The GLOF with the peak discharge of 1270 m3 s-1 was evolved along the Midui Valley following sediment-laden flow–non-viscous debris flow–viscous debris flow–non-viscous debris flow–sediment-laden flood. Eventually the sediment-laden floods blocked the Palongzangbu River. (3) Comparing the conditions for the outburst in 1988 and at present, the possibility of a future outburst is thought to be small unless the glacier moves rapidly again.

scholarly journals Effects of Y-type spillway lateral contraction ratios on debris flow patterns and scour features behind a check dam

2016 ◽  
Author(s):  
Huayong Chen ◽  
Jinfeng Liu ◽  
Wanyu Zhao
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Flow Patterns ◽  
Check Dam ◽  
Mountainous Areas ◽  
Dimensionless Analysis ◽  
Lateral Contraction ◽  
Contraction Ratio ◽  
New Type ◽  
Good Agreement

Abstract. Debris flows often cause devastating damage to property and can injure or kill residents in mountainous areas. The construction of check dams in debris flow valleys is considered a useful strategy for mitigating the damages downstream. In this paper, a new type of spillway structure with lateral contraction was proposed to distribute debris flows after the check dam storage filled up. Four different lateral contraction ratios of the spillway were considered in experiments that investigated debris flow patterns, scour characteristics, and energy dissipation rates when debris flows passed through the spillway. The results indicated that lateral contraction considerably influenced the extension of debris flow nappes. The drop length of the nappe at η = 0.7 (η means lateral contraction ratio) was approximately 1.4 times larger than at η = 0.4. The collision, friction, and mixing forces between the debris flow nappes and debris flows in downstream plunge pools dissipated much of the debris flow kinetic energy, ranging from 42.03 % to 78.08 % at different contraction ratios. Additionally, based on a dimensionless analysis, an empirical model was proposed to predict the maximum scour depth behind the check dam. It indicated that the results calculated by the model exhibited good agreement with the experimental results.

Evaluation and Governance Design of Risk Factor of Debris Flow on Gunmaling

2011 ◽  
Vol 90-93 ◽  
pp. 3151-3154
Author(s):  
Lei Nie ◽  
Li Na Xu ◽  
Yan Xin Yu
Keyword(s):  
Debris Flow ◽  
Correlation Method ◽  
Mature Stage ◽  
Check Dam ◽  
Effect Measure ◽  
Gray Correlation ◽  
Medium Risk ◽  
Reduce Risk ◽  
Total Capacity ◽  
Set Up

Abstract: It is analyzed and obtained the result that the debris flow is currently in mature stage with medium risk and high occurrence through the gray correlation method of fractal research and effect measure of debris flow gully. Therefore, it is necessary to take corresponding governance measures. In this article, check dam is used as main preventive engineering measures to set up two check dams in the passing area of debris flow, with total capacity about 2800m3 and design reservoir capacity of flood once per 50 years. Construction of the check dam will effectively reduce risk of debris flow.

Sediment-trapping effectiveness of check dams with multiple debris-flow surges: Experimental study

2021 ◽  
Author(s):  
Jiangang Chen ◽  
Xi'an Wang ◽  
Huayong Chen
Keyword(s):  
Debris Flow ◽  
Field Investigation ◽  
Sediment Deposition ◽  
Disaster Mitigation ◽  
Check Dam ◽  
Sediment Trapping ◽  
Check Dams ◽  
The Relationship ◽  
Debris Flow Hazard ◽  
Deposition Morphology

<p>A series of check dams were constructed for debris-flow hazard mitigation in China. Based on the results of field investigation, check dam has a significant impact on the geomorphology of debris flow gully, especially the upstream and downstream of a check dam. According to the relationship between the sediment deposition thickness and the check dam height, the running status of a check dam can be divided into three states: without sediment deposition, half of the storage capacity with sediment deposition, and full of sediment deposition. With the accumulation of sediment transport, the running state of a check dam gradually changed and the sediment-trapping effect of check dams has gradually weakened, leading to the loss of part of the disaster mitigation effect, increasing the risk of downstream infrastructure and human security. Therefore, experiments with multi-surges of debris flows were carried out to study the geomorphic and sediment-trapping effectiveness of check dams. The results showed that with the increase of the sediment amount with multi-surges, the deposition slope in the downstream dam approached or even exceeded that of upstream dam. For one surge, deposition morphology has slightly difference in the cascade dams. At last, a method for calculating the reduction coefficient of deposition slope considering the check dam height and sediment amount with multi-surges is proposed.</p>

The Calculating Method of Deposition Thickness of Viscous Debris Flow

2012 ◽  
Vol 524-527 ◽  
pp. 808-812
Author(s):  
Yong You ◽  
Xue Ping Lin ◽  
Jin Feng Liu
Keyword(s):  
Debris Flow ◽  
Calculation Method ◽  
Flow Cell ◽  
Force Analysis ◽  
Slope Gradient ◽  
Calculating Method ◽  
Maximum Value ◽  
Viscous Debris Flow ◽  
Deposition Thickness ◽  
Theoretical Mechanics

The deposition thickness is one of the most important parameters of debris flow. How to define the deposition shape along the viscous debris flow gully and how to calculate deposition thickness rationally were rarely studied in previous researches. This paper discussed the calculation method of deposition thickness of viscous debris flow based on theoretical deduction. Firstly, force analysis was carried out for a debris flow cell selected from the deposition. Then, the formula for calculating the deposition thickness of viscous debris flow was constructed based on deduction from the viewpoint of theoretical mechanics. At last, the deposition thickness under different slope gradients, yield stresses and densities was calculated based on the deduced formula. The results showed that the deposition thickness decreases with the increasing of the slope gradient and density, and increases with the increasing of the yield stress before the deposition thickness reaches to the maximum value.

scholarly journals Characteristics of a Debris Flow Disaster and Its Mitigation Countermeasures in Zechawa Gully, Jiuzhaigou Valley, China

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1256 ◽  
Author(s):  
Xing-Long Gong ◽  
Kun-Ting Chen ◽  
Xiao-Qing Chen ◽  
Yong You ◽  
Jian-Gang Chen ◽  
...  
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Peak Discharge ◽  
Dam Failure ◽  
Check Dam ◽  
Jiuzhaigou Earthquake ◽  
Property Losses ◽  
Jiuzhaigou Valley ◽  
Engineering Projects ◽  
Debris Flow Disaster

On 8 August 2017, an Ms 7.0 earthquake struck Jiuzhaigou Valley, triggering abundant landslides and providing a huge source of material for potential debris flows. After the earthquake debris flows were triggered by heavy rainfall, causing traffic disruption and serious property losses. This study aims to describe the debris flow events in Zechawa Gully, calculate the peak discharges of the debris flows, characterize the debris flow disasters, propose mitigation countermeasures to control these disasters and analyse the effectiveness of countermeasures that were implemented in May 2019. The results showed the following: (1) The frequency of the debris flows in Zechawa Gully with small- and medium-scale will increase due to the influence of the Ms 7.0 Jiuzhaigou earthquake. (2) An accurate debris flow peak discharge can be obtained by comparing the calculated results of four different methods. (3) The failure of a check dam in the channel had an amplification effect on the peak discharge, resulting in a destructive debris flow event on 4 August 2016. Due to the disaster risk posed by dam failure, both blocking and deposit stopping measures should be adopted for debris flow mitigation. (4) Optimized engineering countermeasures with blocking and deposit stopping measures were proposed and implemented in May 2019 based on the debris flow disaster characteristics of Zechawa Gully, and the reconstructed engineering projects were effective in controlling a post-earthquake debris flow disaster on 21 June 2019.

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