Debris flow formation conditions and optimal characteristics of drainage canal following Wenchuan earthquake

2011 ◽  
Vol 65 (4) ◽  
pp. 1005-1012 ◽  
Author(s):  
Yong You ◽  
Jinfeng Liu ◽  
Xingzhang Chen ◽  
Huali Pan
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
Drainage Canal ◽  
Flow Formation ◽  
Formation Conditions

scholarly journals Analysis of a debris flow after Wenchuan Earthquake and discussion on preventive measures

2019 ◽  
Vol 23 (3 Part A) ◽  
pp. 1563-1570
Author(s):  
Zhi-Long Zhang ◽  
Jing Xie ◽  
De-Ke Yu ◽  
Zhi-Jie Wen
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
Preventive Measures ◽  
Impact Force ◽  
Site Investigation ◽  
The Wenchuan Earthquake ◽  
Formation Conditions ◽  
National Road ◽  
And Control ◽  
Debris Flow Disaster

This paper addresses a debris flow disaster in Yingxiu town after the Wenchuan earthquake. Through site investigation and data review, the geography and geological environment of the basin and the development, formation conditions and activity characteristics of the debris flow in the basin are analyzed. Calculate and analyze the characteristics of the debris flow, such as gravity, flow velocity and impact force. According to the management idea of combination of blocking and discharging, this paper proposes to arrange three blocking dams in the main ditch, construct drainage gullies in the downstream accumulation section, and prevent and control the aqueduct in the intersection of the main ditch and the G213 national road, which will be similar to the earthquake in the future. It is provided as a reference for research and prevention of the debris flow.

Countermeasures and Scheme in Preventing Zhaohe River Debris Flow Disaster in Erlong Town, Zhenping County in Henan Province

2014 ◽  
Vol 1065-1069 ◽  
pp. 2377-2380
Author(s):  
Wei Zhang
Keyword(s):  
Debris Flow ◽  
Natural Environment ◽  
Henan Province ◽  
Comprehensive Treatment ◽  
The South ◽  
Treatment Scheme ◽  
Flow Formation ◽  
Formation Conditions ◽  
Debris Flow Disaster

Zhaohe debris flow gully is located in the south foothill of Funiu Moutain, serious debris flow disasters occurred here. Now it is still threatening downstream villagers’ life and property safety directly. The geology, landform, climate and other natural environment conditions of Zhaohe valley were analyzed. It shows that Zhao He have debris flow formation conditions. A comprehensive treatment scheme including fending dikes, cleaning river, suppressing foot engineering and biological measures, was put forward based on the hazard characteristic.

scholarly journals Modelling of the hydrological connectivity changes in the Minjiang Upstream after the Wenchuan earthquake using satellite remote sensing and DEM data

2015 ◽  
Vol 3 (2) ◽  
pp. 1113-1136
Author(s):  
H. Z. Zhang ◽  
T. H. Chi ◽  
J. R. Fan
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
Vegetation Recovery ◽  
Hydrological Connectivity ◽  
Horizontal Distance ◽  
Transport Pathway ◽  
Topographic Analysis ◽  
2008 Wenchuan Earthquake ◽  
Recovery Processes ◽  
Flow Formation

Abstract. The 2008 Wenchuan earthquake-induced landslides destroyed larger areas of mountain vegetation and produced large volume of landslide-debris, which made the vegetation's hydrological adjusting function diminished and made the hydrological progresses in slopes changed, resulting in severe erosion and catastrophic debris flows for a rather long time. Since 2008, the landslide-damaged vegetation and its hydrological function have been recovering. In this paper, the Minjiang Upstream watersheds around Yingxiu Town were selected. First, the landslide-damaged vegetation was identified and monitored via multi-temporal (2001–2014) satellite images. Then, the slope materials stability was assessed through topographic analysis of the vegetation survival environments. Then, the hydrological connectivity index (HCI) was defined to describe the upstream sediment production and downstream transport pathway. Finally, results indicated that HCI decreased annually with the vegetation recovery after the obvious increases during the earthquakes. While, analysis of 2008–2013 debris flow events indicated that the areas, the vertical drop to river <1000 m and the horizontal distance to river <2500 m, have high HCI increases and are more susceptible for debris flow formation. Monitoring the landslide-damaged vegetation recovery processes can contribute to assess the hydrological connectivity changes and understand the debris flow formation.

scholarly journals Formation Conditions And Debris Flow Regime In Jiangjia Ravine, Yunnan, China – Applicability Of Russian Methodology

2022 ◽  
Author(s):  
Mingtao Ding ◽  
Aleksandr L. Shnyparkov ◽  
Pavel B. Grebennikov ◽  
Timur I. Khismatullin ◽  
Sergey A. Sokratov
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Climatic Conditions ◽  
Research Station ◽  
Normative Documents ◽  
Flow Formation ◽  
Geological Conditions ◽  
Wide Range ◽  
Formation Conditions ◽  
Former Ussr

The requirements of the debris flows’ parameters assessments vary from country to country. They are based on different theoretical and empirical constructions and are validated by data from different regions. This makes difficult comparison of the reported results on estimated debris flows activity and extent. The Russian normative documents for the debris flows’ parameters calculations are based on empirically-measured parameters in wide range of geological and climatic conditions at the territory of former USSR, but still not cover all the possible conditions of debris flow formation. An attempt was made to check applicability of the Russian empirical constructions for the conditions of the debris flows formation in Yunnan, China, where unique long-term dataset of debris flows characteristics is collected by the Dongchuan Debris Flow Observation and Research Station. The results show, that in general the accepted in Russia methodology of calculation of the parameters of debris flows of certain probability corresponded well to the observed in Dongchuan debris flows characteristics. Some discrepancies (in the average debris flow depth) can be explained by unknown exact return period of the actually observed debris flows. This allowed to conclude that the presently adopted empirical dependencies based on country-wide (USSR) empirical data can be extrapolated up to the monsoon climate and geological conditions of Yunnan province.

scholarly journals Determination of the runoff threshold for triggering debris flows in the area affected by the Wenchuan Earthquake

2014 ◽  
Vol 2 (7) ◽  
pp. 4659-4684 ◽  
Author(s):  
P. Cui ◽  
X. J. Guo ◽  
J. Q. Zhuang
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
Particle Diameter ◽  
Surface Flow ◽  
Flow Density ◽  
Median Particle Diameter ◽  
Flow Formation ◽  
Median Particle ◽  
Runoff Discharge ◽  
Debris Flow Initiation

Abstract. We constructed an experiment to determine the critical runoff discharge for debris flow initiation in Wenchuan Earthquake area. A single dimensionless discharge variable was integrated to incorporate influential parameters, including channel width, median particle diameter, and surface flow discharge. The results revealed that relationship with the debris flow density, slope and discharge required. Taking into account the behaviors of debris flow formation corresponding to different ranges of slopes, the critical runoff thresholds for debris flow initiation were calculated for three different scenarios. The thresholds were validated against actual debris flow events, and the use in this study is applicable.

scholarly journals Application and analysis of debris-flow early warning system in Wenchuan earthquake-affected area

2016 ◽  
Vol 16 (2) ◽  
pp. 483-496 ◽  
Author(s):  
D. L. Liu ◽  
S. J. Zhang ◽  
H. J. Yang ◽  
L. Q. Zhao ◽  
Y. H. Jiang ◽  
...  
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
Early Warning ◽  
Early Warning System ◽  
Prediction Accuracy ◽  
Warning System ◽  
Sichuan Province ◽  
Affected Area ◽  
The Wenchuan Earthquake ◽  
New System

Abstract. The activities of debris flow (DF) in the Wenchuan earthquake-affected area significantly increased after the earthquake on 12 May 2008. The safety of the lives and property of local people is threatened by DFs. A physics-based early warning system (EWS) for DF forecasting was developed and applied in this earthquake area. This paper introduces an application of the system in the Wenchuan earthquake-affected area and analyzes the prediction results via a comparison to the DF events triggered by the strong rainfall events reported by the local government. The prediction accuracy and efficiency was first compared with a contribution-factor-based system currently used by the weather bureau of Sichuan province. The storm on 17 August 2012 was used as a case study for this comparison. The comparison shows that the false negative rate and false positive rate of the new system is, respectively, 19 and 21 % lower than the system based on the contribution factors. Consequently, the prediction accuracy is obviously higher than the system based on the contribution factors with a higher operational efficiency. On the invitation of the weather bureau of Sichuan province, the authors upgraded their prediction system of DF by using this new system before the monsoon of Wenchuan earthquake-affected area in 2013. Two prediction cases on 9 July 2013 and 10 July 2014 were chosen to further demonstrate that the new EWS has high stability, efficiency, and prediction accuracy.

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