Investigation and Analysis on the Debris Flow of Yukou Village in Huoshan Mountain
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Through the analysis on the geneses of the debris flow in Yukou Village in Huoshan Mountain in 1982, this paper expounds the forming conditions and hazards of the debris flow, and advances some corresponding treatment measures and suggestions.Keywords:
Debris flow
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The debris flow occurred in Xianglutan gully was a typical gully debris flow,which was located in Aba Tibetan Autonomous Prefecture in Sichuan Province.According to the basic features of the valley system and the debris flow,the paper at first discusses the formation conditions of the debris flow,like topography,water source and sediment source,then calculates the dynamic parameters,including bulk density,flow rate,flow capacity and sediment flush-out.Finally,proposes the appropriate prevention suggestion for the debris flow.
Debris flow
Hyperconcentrated flow
Mudflow
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Eryang Gully debris flow was one of the typical debris flow gullies in Mingxian County. A rainstorm triggered a debris flow hazard in Eryang Gully on May 10, 2010, with the debris flow developing continuously,the lower main gully debris flowbeing wide, and the slope being small. The large debris flow started from the ditch, main trench caused multi-point dam-breakage and the pull trough was incised, causing serious disasters.
Debris flow
Mudflow
Ditch
Trough (economics)
Hyperconcentrated flow
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In this paper,based on the investigation and analysis,formation conditions of debris flow hazards in SongYang GouGu are analyzed from the view of the topography,source,meteorological and hydrological conditions,which has guiding for understanding the causes of debris flow in this area,and provide a reference for the investigation of valley debris flow.
Debris flow
Geologic hazards
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The Taihang Mountains is one of the main districts of debris flow development in China. On the windward slope of the Taihang Mountains,the type of debris flow belongs to heavy storm type. The main feature of debris flow is that the rock collapse and the landslide translated into debris flow fleetly under the heavy storm. On Aug. 14,1999, the disastrous debris flow developed in the Xiawacha valley, Pingshan county, Hebei Province. It destroyed the Xiawacha village that is located at the mouth of valley and 26 people died. On the basis of field investigation, the authors wanted to record the process of debris flow verily and built the individual record of debris flow. The purpose is to study developing regularity of regional debris flow and put forward the prevention plan finally.
Debris flow
Mudflow
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In order to investigate whether or not the debris flow will harm in dam site and assessing the effect on the construction of dam,the survey about JieYiPo debris flows is well done in field.The character of terrain、geology condition、vegetation、debris flow trail erosion and silt featuse in vale are fully cognized.Simultaneously,some experiments and meterage about the vale and debris flow fans havebeen practiced.Based on the formula about dilute debris flow,the velocity of flow、runoff and wallop of JieYiPo debris flow are computed.All of these works,offer the basic evidences for the assessment of geological hazard about debris flow.The surveys shows that the activity of JieYiPo debris flow is overblown,however,the soil and water conservation in the catchment areas should be strengthened,especially focused on the exposed sloping field in the entrance.
Debris flow
Silt
Field survey
Mudflow
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Taking the debris flow of Kelinxi gully in Gongjue County of Tibet as an example,the material composition and the geometrical features of forming,circulation and accumulation areas were summarized,and the forming causes were analyzed from the terrain and landforms,the geological structure,the formation lithology,the hydrology and meteorology as well as human activities.The results were as follows: intensive neotectonic movement and frequent earthquake activity were regarded as the macroscopic geological conditions of occurrence of debris flow disasters;the glaciated landform,formed by ancient glacial denudation was regarded as the prerequisite for the catchment of debris flow,the material source and flowage of debris flow;the poor soil formation and the low vegetation coverage ratio caused by severe soil and water loss were regarded as the ecological and environmental conditions of occurrence of debris flow disasters;the mass rainfall and abundant clastics which formed by strong physical weathering were regarded as the basic material composition and source of occurrence of debris flow disasters;the blindfold human activities aggravated the emergence,development and harm extent of debris flow disasters.Finally,some suggestions for prevention of debris flow disasters were put forward from the genesis.
Debris flow
Denudation
Landform
Mudflow
Lithology
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This paper takes the debris flow in Lufang furrow as an research object.From the four aspects that are the topography,geological structure and stratigraphy lithology,human engineering activities,meteorological and hydrological,the causes of the debris flow hazard are analyzed,and the basic conditions of formation mudslides and main inducing factors are summed up.Results show that the material factor,and physical feature satisfy the formation conditions of debris flow in the valley,and the formation conditions are sufficient.If the water factor satisfy the formation conditions of debris flow in the valley,it may break out debris flow again.This research is of certain significance to the prediction and mitigation of debris flow hazard in Lufang valley.
Debris flow
Mudflow
Lithology
Hyperconcentrated flow
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Debris flow
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Debris flow gully has various morphologies because of different type and developed phase of debris flow,and it is important and practical to study the debris flow gully.The valley area,gully length,average bed slope and average valley width of 32 disastrous debris flow gully are analyzed.At last,several conclusions are got,and they will give reference to the assessment of debris flow hazards and prevention to debris flow.
Debris flow
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Polongzangbu Basin, located in southeastern Tibet, is known by the world for its debris flow hazards, especially the debris flow, taking place in Zamulongba gully on 9th April, 2000, which blocked Yigong Lake 62 days and the following breaking flood cursed severely losses. Presently, the debris flow activities occur frequently. Based on the historical data, remote sensing conveying and field investigation, authors have determined that there are 104 debris flow gullies in Polongzangbu Basin, 87 of which have clear channel. The debris flow gullies locate the altitude between 2 500 m and 4 000 m, and their basin areas are between 0.8 km 2 and 185 km 2, especially 80 percent of which are between 1.0 km 2 and 30 km 2. According to the cause of formation, debris flow gullies in this area could be divided into 3 types: glacial, glacial lake burst and rainfall debris flow. At last, this paper discusses the impact of debris flow on the local economic development and environment.
Debris flow
Mudflow
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