Comparison between FLO-2D and Debris-2D on the application of assessment of granular debris flow hazards with case study

Wu, Ying-Hsin; Liu, Ko Fei; Chen, Yi Chin

doi:10.1007/s11629-013-2511-1

Cited by 72 publications

(31 citation statements)

References 17 publications

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“…For this research, FLO-2D was selected to simulate flood inundation for the current and future climate, corresponding to a 50-year return period. FLO-2D can generate the temporal change in the flow depth, flow velocity, and affected areas [38]. Several data are employed to simulate floods, such as a digital elevation model (DEM) with a 30 m resolution, soil type from the Food and Agriculture Organization (FAO), and land-use data derived from Landsat satellite images [36].…”

Section: Flood Hazardmentioning

confidence: 99%

Assessment of Tangible Direct Flood Damage Using a Spatial Analysis Approach under the Effects of Climate Change: Case Study in an Urban Watershed in Hanoi, Vietnam

Kefi

Mishra

Kumar

et al. 2018

IJGI

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Due to climate change, the frequency and intensity of Hydro-Meteorological disasters, such as floods, are increasing. Therefore, the main purpose of this work is to assess tangible future flood damage in the urban watershed of the To Lich River in Hanoi, Vietnam. An approach based on spatial analysis, which requires the integration of several types of data related to flood characteristics that include depth, in particular, land-use classes, property values, and damage rates, is applied for the analysis. To simulate the future scenarios of flooding, the effects of climate change and land-use changes are estimated for 2030. Additionally, two scenarios based on the implementation of flood control measures are analyzed to demonstrate the effect of adaptation strategies. The findings show that climate change combined with the expansion of built-up areas increases the vulnerability of urban areas to flooding and economic damage. The results also reveal that the impacts of climate change will increase the total damage from floods by 26%. However, appropriate flood mitigation will be helpful in reducing the impacts of losses from floods by approximately 8% with the restoration of lakes and by approximately 29% with the implementation of water-sensitive urban design (WSUD). This study will be useful in helping to identify and map flood-prone areas at local and regional scales, which can lead to the detection and prioritization of exposed areas for appropriate countermeasures in a timely manner. In addition, the quantification of flood damage can be an important indicator to enhance the awareness of local decision-makers on improving the efficiency of regional flood risk reduction strategies.

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Section: Flood Hazardmentioning

confidence: 99%

Assessment of Tangible Direct Flood Damage Using a Spatial Analysis Approach under the Effects of Climate Change: Case Study in an Urban Watershed in Hanoi, Vietnam

Kefi

Mishra

Kumar

et al. 2018

IJGI

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“…Debris-2D was developed by Liu and Huang (2006) and has been widely applied by researchers (Liu et al, 2009;Tsai et al, 2011;Wu et al, 2013). The debris flow is treated as a single phase non-Newtonian fluid in the model.…”

Section: Debris Flow Simulationmentioning

confidence: 99%

Potential Impact of Climate Change and Extreme Events on Slope Land Hazard – A Case Study of Xindian Watershed in Taiwan

Wei¹,

Li²,

Shih³

et al. 2018

Preprint

Self Cite

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Abstract. The production and transportation of sediment in mountainous areas caused by extreme rainfall events triggered by climate change is a challenging problem, especially in watersheds. To investigate this issue, the present study adopted the scenario approach coupled with simulations using various models. Upon careful model selection, the simulation of projected rainfall, landslide, debris flow, and loss assessment were integrated by connecting the models' input and output. The Xindian 10 watershed upstream from Taipei, Taiwan, was identified and two extreme rainfall scenarios from the late 20th and 21st centuries were selected to compare the effects of climate change. Using sequence simulations, the chain reaction and compounded disaster were analysed. Moreover, the potential effects of slope land hazards were compared between the present and future, and the likely impacts in the selected watershed areas were discussed with respect to extreme climate. The results established that the unstable sediment volume would increase by 28.81% in terms of the projected extreme event. The total 15 economic losses caused by the chain impacts of slope land disasters under climate change would be increased to US$ 358.25 million. Owing to the geographical environment of the Taipei metropolitan area, the indirect losses of water supply shortage caused by slope land disasters would be more serious than direct losses. In particular, avenues to ensure the availability of water supply will be the most critical disaster prevention topic in the event of a future slope land disaster. The results obtained from this study are expected to be beneficial, because they provide critical information for devising long-term strategies to 20 combat the impacts of slope land disasters.

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“…Indeed, it is easy to find in the literature several applications of such a model, which mainly differ in relation to the sediment characteristics, and hence, in relation to the adopted rheological parameters (see, for example, Bertolo et al, 2005;Boniello et al, 2010;Wu et al, 2013). Various comparisons between its performances and those of other methodologies are also available.…”

Section: M Stancanelli and E Foti: A Comparative Assessment Of Tmentioning

confidence: 99%

“…Here the following values were assumed: α 1 = 0.006032; β 1 = 19.9; α 2 = 0.000707; β 2 = 29.8. These values were chosen from the ones available in the literature, with the aim of selecting those that have similar geomorphological and lithological characteristics to those present in the studied area (O'Brien and Julien, 1988;Bertolo et al, 2005;Boniello et al, 2010;Wu et al, 2013). In order to perform the simulations with the TRENT-2D model, it is necessary to estimate the parameters ϕ, Y and β (Eqs.…”

Section: Input Data For Modellingmentioning

confidence: 99%

A comparative assessment of two different debris flow propagation approaches – blind simulations on a real debris flow event

Stancanelli

Foti

2015

Nat. Hazards Earth Syst. Sci.

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Abstract.A detailed comparison between the performances of two different approaches to debris flow modelling was carried out. In particular, the results of a mono-phase Bingham model (FLO-2D) and that of a two-phase model (TRENT-2D) obtained from a blind test were compared. As a benchmark test the catastrophic event of 1 October 2009 which struck Sicily causing several fatalities and damage was chosen. The predicted temporal evolution of several parameters of the debris flow (such as flow depth and propagation velocity) was analysed in order to investigate the advantages and disadvantages of the two models in reproducing the global dynamics of the event. An analysis between the models' results with survey data have been carried out, not only for the determination of statistical indicators of prediction accuracy, but also for the application of the Receiver Operator Characteristic (ROC) approach. Provided that the proper rheological parameters and boundary conditions are assigned, both models seem capable of reproducing the inundation areas in a reasonably accurate way. However, the main differences in the application rely on the choice of such rheological parameters. Indeed, within the more user-friendly FLO-2D model the tuning of the parameters must be done empirically, with no evidence of the physics of the phenomena. On the other hand, for the TRENT-2D the parameters are physically based and can be estimated from the properties of the solid material, thus reproducing more reliable results. A second important difference between the two models is that in the first method the debris flow is treated as a homogeneous flow, in which the total mass is kept constant from its initiation in the upper part of the basin to the deposition in a debris fan. In contrast, the second approach is suited to reproduce the erosion and deposition processes and the displaced mass can be directly related to the rainfall event. Application of both models in a highly urbanized area reveals the limitation of numerical simulation which is inadequate in describing some disturbances of the flows that occurred during the alluvial event (e.g. the cars, the volume of debris within buildings etc.) which have a crucial influence on the evaluation of the maximum and final flow depths.

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Comparison between FLO-2D and Debris-2D on the application of assessment of granular debris flow hazards with case study

Cited by 72 publications

References 17 publications

Assessment of Tangible Direct Flood Damage Using a Spatial Analysis Approach under the Effects of Climate Change: Case Study in an Urban Watershed in Hanoi, Vietnam

Assessment of Tangible Direct Flood Damage Using a Spatial Analysis Approach under the Effects of Climate Change: Case Study in an Urban Watershed in Hanoi, Vietnam

Potential Impact of Climate Change and Extreme Events on Slope Land Hazard – A Case Study of Xindian Watershed in Taiwan

A comparative assessment of two different debris flow propagation approaches – blind simulations on a real debris flow event

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