A Study on the Debris Flow Hazard Mapping Method using SINMAP and FLO-2D

2016 ◽  
Vol 24 (2) ◽  
pp. 15-24
Author(s):  
Tae Yun Kim ◽  
Hong Sic Yun ◽  
Jung Hwan Kwon
Keyword(s):  
Debris Flow ◽  
Mapping Method ◽  
Hazard Mapping ◽  
Debris Flow Hazard

Debris flow hazard mapping considering the effect of mitigation structure – a case study in Taiwan based on numerical simulation

2020 ◽  
Author(s):  
Chih-Hao Hsu ◽  
Chuan-Yi Huang ◽  
Ting-Chi Tsao ◽  
Hsiao-Yuan Yin ◽  
Hsiao-Yu Huang ◽  
...  
Keyword(s):  
Debris Flow ◽  
Water Conservation ◽  
Large Scale ◽  
Mass Movement ◽  
Hazard Mapping ◽  
Hazard Map ◽  
Inundation Depth ◽  
Central Taiwan ◽  
Debris Flow Hazard ◽  
Typhoon Herb

<p>This study added the dams and retain basin according to their dimensions measured with UAV onto the original 5m-resolition DEM to compare the effect of mitigation structures to debris flow hazard. The original and the modified DEMs were both applied to simulate the consequences by using RAMMS::Debris Flow (RApid Mass Movement Simulation) model.</p><p>Hazard map is the best tool to provide the information of debris flow hazard in Taiwan. It has an important role to play in evacuating the residents within the affected zone during typhoon season. For the reason, debris flow hazard maps become a useful tool for local government to execute the evacuation. As the mitigation structure is constructed, the intensity of debris flow hazard reduces.</p><p>The Nantou DF190 debris flow potential torrent is located in central Taiwan. In 1996 when Typhoon Herb stroke, 470,000 cubic-meter of debris were washed out and deposited in 91,200 square-meter area (Yu et al., 2006), and the event caused the destruction of 10 residential houses with 2 fatalities. After the event the Soil and Water Conservation Bureau constructed a 100-meter long sabo dam and sediment retain basin with capacity of 60,000 cubic-meters. In order to compare the difference of affected zone before and after the construction of mitigation structures, the study applies RAMMS to simulate the above-mentioned event.</p><p>The result shows when large-scale debris flow occurs, most of the sediments still overflow and deposit on the fan with shape similar to the 1996 Typhoon Herb event. However, the intensity has reduced significantly with 50% less in area, several meters less in inundation depth and 50% less in flow velocity approximately. The comparison shows the effect of mitigation structures and could provide valuable information for debris flow hazard mapping.</p><p>Key Words: Debris flow, RAMMS, Hazard map, Mitigation, Taiwan</p>

A pragmatic approach to debris flow hazard mapping in areas affected by Hurricane Mitch: example from NW Nicaragua

2004 ◽  
Vol 72 (1-2) ◽  
pp. 57-72 ◽  
Author(s):  
Raimon Pallàs ◽  
Joan Manuel Vilaplana ◽  
Marta Guinau ◽  
Ester Falgàs ◽  
Xavier Alemany ◽  
...  
Keyword(s):  
Debris Flow ◽  
Hazard Mapping ◽  
Pragmatic Approach ◽  
Hurricane Mitch ◽  
Debris Flow Hazard

scholarly journals Spatial variability and potential impacts of climate change on flood and debris flow hazard zone mapping and implications for risk management

2008 ◽  
Vol 8 (3) ◽  
pp. 539-558 ◽  
Author(s):  
H. Staffler ◽  
R. Pollinger ◽  
A. Zischg ◽  
P. Mani
Keyword(s):  
Risk Management ◽  
Debris Flow ◽  
Spatial Variability ◽  
Case Studies ◽  
Climate Changes ◽  
Hazard Mapping ◽  
Hazard Zone ◽  
Debris Flow Hazard ◽  
River Catchments ◽  
Protection Structures

Abstract. The main goals of this study were to identify the alpine torrent catchments that are sensitive to climatic changes and to assess the robustness of the methods for the elaboration of flood and debris flow hazard zone maps to specific effects of climate changes. In this study, a procedure for the identification and localization of torrent catchments in which the climate scenarios will modify the hazard situation was developed. In two case studies, the impacts of a potential increase of precipitation intensities to the delimited hazard zones were studied. The identification and localization of the torrent and river catchments, where unfavourable changes in the hazard situation occur, could eliminate speculative and unnecessary measures against the impacts of climate changes like a general enlargement of hazard zones or a general over dimensioning of protection structures for the whole territory. The results showed a high spatial variability of the sensitivity of catchments to climate changes. In sensitive catchments, the sediment management in alpine torrents will meet future challenges due to a higher rate for sediment removal from retention basins. The case studies showed a remarkable increase of the areas affected by floods and debris flow when considering possible future precipitation intensities in hazard mapping. But, the calculated increase in extent of future hazard zones lay within the uncertainty of the methods used today for the delimitation of the hazard zones. Thus, the consideration of the uncertainties laying in the methods for the elaboration of hazard zone maps in the torrent and river catchments sensitive to climate changes would provide a useful instrument for the consideration of potential future climate conditions. The study demonstrated that weak points in protection structures in future will become more important in risk management activities.

scholarly journals A method for multi-hazard mapping in poorly known volcanic areas: an example from Kanlaon (Philippines)

2013 ◽  
Vol 13 (8) ◽  
pp. 1929-1943 ◽  
Author(s):  
M. Neri ◽  
G. Le Cozannet ◽  
P. Thierry ◽  
C. Bignami ◽  
J. Ruch
Keyword(s):  
Land Use Planning ◽  
Volcanic Hazards ◽  
Mapping Method ◽  
Hazard Mapping ◽  
Hazard Map ◽  
Event Tree ◽  
Planning Decisions ◽  
Civil Defence ◽  
Term Data

Abstract. Hazard mapping in poorly known volcanic areas is complex since much evidence of volcanic and non-volcanic hazards is often hidden by vegetation and alteration. In this paper, we propose a semi-quantitative method based on hazard event tree and multi-hazard map constructions developed in the frame of the FP7 MIAVITA project. We applied this method to the Kanlaon volcano (Philippines), which is characterized by poor geologic and historical records. We combine updated geological (long-term) and historical (short-term) data, building an event tree for the main types of hazardous events at Kanlaon and their potential frequencies. We then propose an updated multi-hazard map for Kanlaon, which may serve as a working base map in the case of future unrest. The obtained results extend the information already contained in previous volcanic hazard maps of Kanlaon, highlighting (i) an extensive, potentially active ~5 km long summit area striking north–south, (ii) new morphological features on the eastern flank of the volcano, prone to receiving volcanic products expanding from the summit, and (iii) important riverbeds that may potentially accumulate devastating mudflows. This preliminary study constitutes a basis that may help local civil defence authorities in making more informed land use planning decisions and in anticipating future risk/hazards at Kanlaon. This multi-hazard mapping method may also be applied to other poorly known active volcanoes.

scholarly journals A Hydrologically Based Model for Delineating Hazard Zones in the Valleys of Debris Flow Basins

2016 ◽  
Author(s):  
Kaiheng Hu ◽  
Pu Li ◽  
Yong You ◽  
Fenghuan Su
Keyword(s):  
Debris Flow ◽  
Cross Sections ◽  
Large Scale ◽  
Test Case ◽  
Inundation Area ◽  
Hazard Zoning ◽  
Python Scripting ◽  
Minimal Data ◽  
Data Requirements ◽  
Debris Flow Hazard

Abstract. A hydrologically based model is developed for delineating hazard zones in valleys of debris flow basins. The basic assumption of this model is that the ratio of peak discharges of any two cross sections in a debris-flow basin is a power function of the ratio of their flow accumulation areas. Combining the advantages of the empirical and flow routing models of debris-flow hazard zoning, this hydrological model with minimal data requirements has the ability to produce hazard intensity values at different event magnitudes. The algorithms used in this model are designed in the framework of grid- based geographic processing and implemented completely on ArcGIS platform and a Python scripting environment. Qipan basin in the Wenchuan county of Sichuan province, southwest China where a large-scale debris-flow event occurred on July 11, 2013 was chosen as the test case for the model. The hazard zone identified by the model showed good agreement with the real inundation area of the event. The proposed method can help identify small hazard areas in upstream tributaries and the developed model is promising in terms of its application in debris-flow hazard zoning.

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