Patterns of rainfall-threshold for debris-flow occurrence in the Wenchuan seismic region, Southwest China

2021 ◽  
Vol 80 (3) ◽  
pp. 2117-2130
Author(s):  
Ming Chang ◽  
Xiangyang Dou ◽  
Tristram C. Hales ◽  
Bin Yu
Keyword(s):  
Debris Flow ◽  
Southwest China ◽  
Rainfall Threshold ◽  
Seismic Region

Impacts of small woody debris on slurrying, persistence, and propagation in a low-gradient channel of the Dongyuege debris flow in Nu River, Southwest China

Landslides ◽  
2018 ◽  
Vol 15 (11) ◽  
pp. 2279-2293 ◽  
Author(s):  
Yong-Jun Tang ◽  
Ze-Min Xu ◽  
Tai-Qiang Yang ◽  
Zhen-Hua Zhou ◽  
Kun Wang ◽  
...  
Keyword(s):  
Debris Flow ◽  
Southwest China ◽  
Woody Debris ◽  
Gradient Channel ◽  
Nu River ◽  
Small Woody Debris

scholarly journals Quantitative Assessment of Regional Debris-Flow Risk: A Case Study in Southwest China

2018 ◽  
Vol 10 (7) ◽  
pp. 2223 ◽  
Author(s):  
Guangxu Liu ◽  
Erfu Dai ◽  
Xinchuang Xu ◽  
Wenxiang Wu ◽  
Aicun Xiang
Keyword(s):  
Debris Flow ◽  
Quantitative Assessment ◽  
Southwest China

Rainfall threshold calculation method for debris flow pre-warning in data-poor areas

2013 ◽  
Vol 24 (5) ◽  
pp. 854-862 ◽  
Author(s):  
Huali Pan ◽  
Jiangcheng Huang ◽  
Ren Wang ◽  
Guoqiang Ou
Keyword(s):  
Debris Flow ◽  
Calculation Method ◽  
Rainfall Threshold

scholarly journals Estimation of debris flow critical rainfall thresholds by a physically-based model

2012 ◽  
Vol 9 (11) ◽  
pp. 12797-12824 ◽  
Author(s):  
M. N. Papa ◽  
V. Medina ◽  
F. Ciervo ◽  
A. Bateman
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Rainfall Threshold ◽  
Richards Equation ◽  
Reduced Form ◽  
Physically Based Model ◽  
Rainfall Characteristics ◽  
South Italy ◽  
Infinite Slope Stability Model ◽  
Physically Based

Abstract. Real time assessment of debris flow hazard is fundamental for setting up warning systems that can mitigate its risk. A convenient method to assess the possible occurrence of a debris flow is the comparison of measured and forecasted rainfall with rainfall threshold curves (RTC). Empirical derivation of the RTC from the analysis of rainfall characteristics of past events is not possible when the database of observed debris flows is poor or when the environment changes with time. For landslides triggered debris flows, the above limitations may be overcome through the methodology here presented, based on the derivation of RTC from a physically based model. The critical RTC are derived from mathematical and numerical simulations based on the infinite-slope stability model in which land instability is governed by the increase in groundwater pressure due to rainfall. The effect of rainfall infiltration on landside occurrence is modelled trough a reduced form of the Richards equation. The simulations are performed in a virtual basin, representative of the studied basin, taking into account the uncertainties linked with the definition of the characteristics of the soil. A large number of calculations are performed combining different values of the rainfall characteristics (intensity and duration of event rainfall and intensity of antecedent rainfall). For each combination of rainfall characteristics, the percentage of the basin that is unstable is computed. The obtained database is opportunely elaborated to derive RTC curves. The methodology is implemented and tested on a small basin of the Amalfi Coast (South Italy).

The Study of the Topography-Measure Applied in China's Southwest Precipitous Areas a Case Study in YunDian Village HuiLi County in LiangShan Autonomous Prefecture

2015 ◽  
Vol 744-746 ◽  
pp. 1714-1719
Author(s):  
Jia Na Li ◽  
Kun Zhang
Keyword(s):  
Debris Flow ◽  
Southwest China ◽  
Reference Value ◽  
Geological Structure ◽  
Mountainous Areas ◽  
Geological Structures ◽  
Geological Disaster

Since the area of Southwest China crosses the first ladder and the second one ,thus it is featured with precipitous terrains. Owing to such complex factors as deep valleys, steep mountains, varied topography and complex geological structures, it is extremely hard for people to obtain exact leveling data about this area. Therefore ,it is necessary to summarize the geodetic datum and tech of Southwestern mountainous areas, which can be of great reference value for the research of the similar places with regards to its hydrology, geology, geological structure and ground. At the same time this essay will contribute to the study of geological disaster such as earthquake ,landslide and debris flow.

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