scholarly journals STUDY ON AN EVALUATION METHOD OF INITIATION PROBABILITY OF DEBRIS FLOWS DURING HEAVY RAINFALL

2021 ◽  
Vol 9 (1) ◽  
pp. 94-102
Author(s):  
Rikiya KOBASHI ◽  
Masato KITA ◽  
Tatsuhiko UCHIDA ◽  
Yoshihisa KAWAHARA
Keyword(s):  
Debris Flows ◽  
Heavy Rainfall ◽  
Evaluation Method

scholarly journals STUDY ON AN EVALUATION METHOD OF INITIATION ROBABILITY OF DEBRIS FLOWS DURING HEAVY RAINFALL

2019 ◽  
Vol 75 (1) ◽  
pp. 191-199
Author(s):  
Rikiya KOBASHI ◽  
Masato KITA ◽  
Tatsuhiko UCHIDA ◽  
Yoshihisa KAWAHARA
Keyword(s):  
Debris Flows ◽  
Heavy Rainfall ◽  
Evaluation Method

Research on Risk Level of Debris Flow in an Area

2014 ◽  
Vol 638-640 ◽  
pp. 2015-2018
Author(s):  
Qing Nian Yang ◽  
Shuai Tao Wu ◽  
Zhi Li
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Evaluation Method ◽  
Risk Level ◽  
The Tibetan Plateau ◽  
Adverse Conditions ◽  
Southeastern Margin ◽  
The Sichuan Basin ◽  
Original Vegetation ◽  
Steep Terrain

The research targets at the transition zone from the southeastern margin of the Tibetan Plateau to the Sichuan Basin; it is shown according to field survey: from 2008 to 2010, debris flow occurred twice, resulting in missing of two people, destruction on a lot of farmland and other serious disasters. Such the debris flows were because that the original vegetation was severely damaged after “5.12” earthquake, a lot of loose blocks were scattered in slopes and valleys, and also stimulated by abundant rainfall during rainy season, local steep terrain, as well as narrow valleys. The paper makes qualitative and quantitative evaluation on risk of debris flow within the region by single-valley debris flow risk evaluation method as proposed by Liu Xilin and Tang Chuan et al. it is shown from the results that the risk level H is 0.55, within scope of moderate risk. In case of any adverse conditions, debris flows may occur again.

scholarly journals A Detail on Landslide & its Types

2017 ◽  
pp. 19-27
Author(s):  
Rudolf Vukelic
Keyword(s):  
Debris Flows ◽  
Driving Force ◽  
Heavy Rainfall ◽  
Submarine Landslides ◽  
Mass Wasting ◽  
Rock Falls ◽  
Factors Affecting ◽  
Mountain Ranges ◽  
Wide Range ◽  
Coastal Cliffs

The term landslide or, less frequently, landslip, refers to several forms of mass wasting that include a wide range of ground movements, such as rock falls, deep-seated slope failures, mudflows and debris flows. Landslides occur in a variety of environments, characterized by either steep or gentle slope gradients: from mountain ranges to coastal cliffs or even underwater, in which case they are called submarine landslides. Gravity is the primary driving force for a landslide to occur, but there are other factors affecting slope stability which produce specific conditions that make a slope prone to failure. In many cases, the landslide is triggered by a specific event (such as a heavy rainfall, an earthquake, a slope cut to build a road, and many others), although this is not always identifiable.

Risk Evaluation of Debris Flow in the Cheng-Hai Valley of Yunnan Province

2011 ◽  
Vol 71-78 ◽  
pp. 1560-1564
Author(s):  
Ting Ting Guo ◽  
Shi Guang Xu ◽  
Zhi Quan Yang
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Yunnan Province ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Solid Materials ◽  
Comprehensive Evaluation Method ◽  
Catchment Areas ◽  
Longitudinal Slope ◽  
Risk Degree

The area of the Cheng-hai valley, located in the centre of Yongsheng county Lijiang city Yunnan province, is an area with dense and frequent debris flow disasters due to unique geology, geomorphology and landform conditions. After in situinvestigation and analyze the present data of these debris flows, we selected six factors, such as catchment areas, the length of main gully, average longitudinal slope of main gull, estimated outflow of every time, potential reserves of solid materials, percentage of grain diameter of solid materials above and beyond 200mm, as main factors for evaluating the risk degree of 6 chosen representative debris flows in the Cheng-hai valley. The multiple-factor comprehensive evaluation method is applied to evaluate the risk degree of debris flow and then the evaluation result shows a good correspond with the practical situation, i.e. this method has a valuable application foreground.

scholarly journals Erratum : Geology of the area where debris flows occurred by a heavy rainfall in Hiroshima at August 20, 2014

2016 ◽  
Vol 122 (2) ◽  
pp. 86-87
Author(s):  
Makoto Saito ◽  
Daisaku Kawabata ◽  
Daisuke Sato ◽  
Shoji Doshida ◽  
Kiminori Araiba
Keyword(s):  
Debris Flows ◽  
Heavy Rainfall

Activity Degree Evaluation of Glacial Debris Flow along International Karakorum Highway (KKH) Based on Fuzzy Theory

2011 ◽  
Vol 261-263 ◽  
pp. 1167-1171 ◽  
Author(s):  
Zhi Quan Yang ◽  
Ying Yan Zhu ◽  
D.H.Steve Zou ◽  
Li Ping Liao
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Evaluation Method ◽  
Fuzzy Theory ◽  
Alluvial Fan ◽  
Vegetation Coverage ◽  
Fuzzy Evaluation ◽  
Effective Evaluation ◽  
Catchment Areas

The area of international Karakorum Highway(KKH), is an area with dense and frequent glacial debris flow disasters due to unique geology, geomorphology and landform conditions,which connects northern Pakistan with northwestward China. After in situinvestigation and analyze the present data of these glacier debris flow, by using the fuzzy evaluation method, we selected seven factors,such as occurrence frequency,catchment areas,volumes of alluvial fan,estimated outflow of every time,vegetation coverage, slope and altitude, as main factors for evaluating the activity degree of 8 chosen representative glacier debris flows along KKH. According to the evaluation results,which are showed a good correspond with the practical situation, it can conclude that the fuzzy evaluation method based on the fuzzy mathematics theory is an very effective evaluation method in dealing with glacial debris flow with lots of fuzzy factors,i.e. this method is available for evaluating the activity degree of glacier debris flows.

scholarly journals Geology of the area where debris flows occurred by a heavy rainfall in Hiroshima at August 20, 2014

2015 ◽  
Vol 121 (9) ◽  
pp. 339-346 ◽  
Author(s):  
Makoto Saito ◽  
Daisaku Kawabata ◽  
Daisuke Sato ◽  
Shoji Doshida ◽  
Kiminori Araiba
Keyword(s):  
Debris Flows ◽  
Heavy Rainfall

scholarly journals Group-occurring landslides and debris flows caused by the continuous heavy rainfall in June 2019 in Mibei village, Longchuan County, Guangdong Province, China

2021 ◽  
Author(s):  
Huilin Bai ◽  
wenkai feng ◽  
Xiaoyu Yi ◽  
Hongyu Fang ◽  
Yiying Wu ◽  
...  
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Heavy Rainfall ◽  
Guangdong Province ◽  
Residual Soil ◽  
Landslide Hazards ◽  
Loose Deposits ◽  
Slope Structure ◽  
Granite Residual Soil ◽  
June 10Th

Abstract From June 10th to 13th, 2019, a continuous heavy rainfall occurred in Longchuan County, Guangdong Province, causing many landslide hazards. Among Longchuan County districts, Mibei village is one of the hardest-hit areas and suffered severe losses. In this paper, field investigation, remote sensing image interpretation , and UAV aerial photography were used to investigate and analyze hazard characteristics. Combined with rainfall monitoring data, laboratory and field tests data, and existing research results, the characteristics and failure mechanism of group-occurring landslides in Mibei village were studied. Because of the continuous heavy rainfall, 327 landslides occurred in the study area, mainly distributed in the north of the Mibei river and along the X158 road. The terrain slope of landslide hazards ranged from 35° to 45°, and the slope structure can be divided into two types. Granite residual soil was the main part of landslide mass, and sliding surface developed along with the interface between bedrock and covering layer. The continuous heavy rainfall from June 10th to 13th was the main triggering factor of the disaster. The total precipitation was 281.3 mm, and the rainfall on June 10th was 153.5 mm. The rain led to the continuous increase of volume water content in granite residual soil and completely weathered granite. The shear strength and parameters of the two materials changed differently, and slope stability continued to decrease, and then landslides occurred under terrain conditions and engineering excavation space. Untimely support and unreasonable support measures for the excavation slope exacerbated the disaster. The development degree of debris flows in the study area was very low, and debris flows were shown as the secondary disaster of landslides. The branch gully terrain is the key to transforming the landslide into the debris flow, and a large amount of loose deposits in the main gully will become the potential source of debris flow in the future.

scholarly journals Observations on a Collapsing Kame Terrace In Glacier Bay National Monument, South-Eastern Alaska

1969 ◽  
Vol 8 (54) ◽  
pp. 413-425 ◽  
Author(s):  
Garry D. Mckenzie
Keyword(s):  
Debris Flows ◽  
Heavy Rainfall ◽  
Water Erosion ◽  
Glacier Bay ◽  
South Eastern ◽  
National Monument ◽  
Melt Water

AbstractDetailed observations on a collapsing kame terrace indicate that the terrace is being reshaped by: slumping and sliding of debris into depressions, melt-water erosion on the side of the terrace, debris flows in the gullies, and stagnant-ice bursts, a phenomenon analogous to a glacier burst except in the mode of formation of the water. Temperatures in the gravel over the ice, where the gravel is about 4 m thick, indicate that the rate of melting of the upper surface of the ice due to conduction may be as high as 24 cm year−1. Highest temperatures in the gravel were recorded during periods of heavy rainfall.

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