scholarly journals Construction of GIS and Database for Debris Flow Potential Study of Chen-You-Lan River Watershed

2000 ◽  
Author(s):  
Meei-Ling Lin ◽  
Yen-Hsu Lu
Keyword(s):  
Debris Flow ◽  
River Watershed ◽  
Potential Study ◽  
Flow Potential

Susceptibility Assessments and Validations of Debris-Flow Events in Meizoseismal Areas: Case Study in China’s Longxi River Watershed

2020 ◽  
Vol 21 (1) ◽  
pp. 05019005 ◽  
Author(s):  
Saier Wu ◽  
Jian Chen ◽  
Chong Xu ◽  
Wendy Zhou ◽  
Leihua Yao ◽  
...  
Keyword(s):  
Debris Flow ◽  
River Watershed

Simulation and Analysis of Debris Flow of Chui-Sue River Watershed

2003 ◽  
Author(s):  
Meei-Ling Lin ◽  
Kuo-Long Wang ◽  
Gee-Jeng Huang
Keyword(s):  
Debris Flow ◽  
River Watershed

scholarly journals Debris flow hazard assessment of the Eryang River watershed based on numerical simulation

2021 ◽  
Vol 861 (6) ◽  
pp. 062002
Author(s):  
Shengshan Hou ◽  
Peng Cao ◽  
Ang Li ◽  
Liang Chen ◽  
Zhen Feng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Debris Flow ◽  
Hazard Assessment ◽  
River Watershed ◽  
Debris Flow Hazard

scholarly journals Sedimentology, dynamics and debris flow potential of Champadevi River, southwest Kathmandu, Nepal

1970 ◽  
Vol 10 ◽  
pp. 9-20
Author(s):  
Naresh Kazi Tamrakar ◽  
Achut Prajapati ◽  
Suman Manandhar
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Alluvial Fan ◽  
Shear Stresses ◽  
Stream Power ◽  
Huge Amount ◽  
Sedimentary Characteristics ◽  
Unconsolidated Material ◽  
Flow Potential ◽  
Headward Erosion

Mountainous and hilly regions are potential for debris flows, one of the major forms of natural disasters, which cause serious damage in downstream areas. The southwestern region of the Kathmandu Valley experienced catastrophic flows in the Champadevi River and its two tributaries (the Aitabare and the Raute Rivers) in July 2002. These rivers were investigated for morphologic, hydraulic and sedimentary characteristics to evaluate potential of debris flow in the area. The Raute and the Aitabare Rivers have tendency of headward erosion due to abrupt drop of gradient down the scarp of the alluvial fan deposit composed of unconsolidated matrix-supported gravel and mud. Because of this tendency, the rivers erode their substrate and banks, and contribute slope movements by sheding a huge amount of clasts and matrix. Therefore, instability condition of rivers and unconsolidated material available in the river courses potentially contribute for debris flow. The tractive shear stresses in the Aitabare, the Raute and the Champadevi Rivers (1.27, 1.60 and 0.48 KPa, respectively) exceeds twice the critical shear stresses required to transport 90th-percentile fraction of the riverbed material (0.14, 0.18 and 0.11 KPa). The stream powers (10.8, 17.2 and 5.1 m-kN/s/m2) of these rivers also greatly exceed the critical stream powers (0.21, 0.35 and 0.18 m-kN/s/m2) required to initiate traction transport. Because the tractive shear stresses and the stream powers that are achieved during bankfull flow are several times larger than the corresponding critical values, even the flow having stream power exceeding the critical stream power may potentially generate debris flow.   doi: 10.3126/bdg.v10i0.1416 Bulletin of the Department of Geology, Tribhuvan University, Kathmandu, Nepal, Vol. 10, 2007, pp. 9-20

Proposal of Estimation Method for Debris Flow Potential Considering Eruptive Activity

2019 ◽  
Vol 14 (1) ◽  
pp. 126-134 ◽  
Author(s):  
Masato Iguchi ◽  
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Volcanic Ash ◽  
Ground Deformation ◽  
Estimation Method ◽  
Summit Crater ◽  
Point Load ◽  
Total Weight ◽  
Eruptive Activity ◽  
Flow Potential

An estimation method for debris flow potential is proposed to evaluate the possibility of the occurrence of rain-triggered debris flows. Sakurajima volcano has repeatedly erupted (Vulcanian type) and has continuously emitted volcanic ash at the Minamidake summit crater or Showa crater east of the summit since 1955, and debris flows have frequently occurred at rates of 10 to 111 events per year. Ground deformation associated with debris flows along the Arimura River were analyzed for the period from 2009 to 2016. Downward tilt (10–450 nrad) in the direction of the river and extensional strain (3–138 nstrain) were detected during occurrence of the debris flows. The tilt and strain changes were modeled using a point load caused by debris flow deposition beside a sabo dam. Depositional weights of individual debris flow events were estimated to range from 6 to 276 kt. The total weight of the debris flows was 2,154 kt, which is approximately 5% of the total weight of volcanic ash ejected from the craters during the study period. Debris flow potential (DFP) was defined as the difference in the volcanic ash deposits along the upper stream of the river (5% of the total) and the lower stream of the river, and the temporal change of the debris flow potential was investigated. When the debris flow potential reached a level of 0.4 Mt resulting from an increase in eruptive activity, debris flows frequently occurred or large debris flows were induced during rainy seasons. The concept of debris flow potential was applied to volcanoes in Indonesia as lahar potential. After the 2010 eruption at Merapi volcano, lahar potential, perhaps, quasi-exponentially decays during the dormant period. The lahar potential of Sinabung volcano complicatedly varies because of long-term eruptivity beginning in 2014.

scholarly journals Simulation of debris flows in the watershed of the Putih River, Indonesia using SIMLAR 2.1

2021 ◽  
Vol 930 (1) ◽  
pp. 012034
Author(s):  
J Ikhsan ◽  
R Ardiansyah ◽  
D Legono
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Rainfall Data ◽  
River Watershed ◽  
Volcanic Material ◽  
Flow Modelling ◽  
Dam Building ◽  
Sediment Data ◽  
The Impact

Abstract In 2010, the eruption of Mount Merapi produced a huge volcanic material for debris flows. One area affected by the debris flows is the watershed of Putih River. To predict the impact caused by debris flows can be done by using software such as the Simulation Lahar (SIMLAR) 2.1. In this paper, debris flow modelling will be carried out using SIMLAR 2.1 in conditions without sabo dams and using sabo dams. This simulation aims to determine the effectiveness of the sabo dams in reducing the impact of debris flows. The data used are rainfall data, DEM and sediment data in Putih River. The results show that the sabo dam building can slow down the velocity of debris flow. In addition, sabo dams also function as a barrier to riverbed erosion in the Putih River watershed. Based on the results above, it can be concluded that SIMLAR 2.1 can predict the impact of debris flows in the Putih River watershed.

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