Debris Flow Simulation of Central Taiwan Area Using FLO-2D
Date Issued
2007
Date
2007
Author(s)
Peng, Chi-Hsien
DOI
zh-TW
Abstract
Taiwan is on the juction of tectonic plates, and is a young, unstable geological area. Fractural stratums contribute to the sources of debris in the basin. Typhoon often induce debris flow hazard, many disasters occurred in the downstream reaches causing damages to people’s life and property, such as typhoon Herb (1996), typhoon Toraji (2001), typhoon Mindulle (2004). In this research, processes of numerical simulation related for debris flow routing is formulated using software FLO-2D, and parameters discussed. The calibrated parameters are then used in in-situ simulation and flow and deposit conditions are discussed. The results can provide information for hazard zoning and helps to provide assistance in people’s life and property.
In this research, results from laboratory experiments by Shieh and Tsai (1998) are used. A debris flow model of the test has constructed using FLO-2D, which is a dynamic flooding routing simulation model. After parameter studying, it was found that both Bingham yielding stress and Bingham viscosity of rheological parameters affected deposit and flow condition. The Bingham yielding stress were determined using deposition evolution of debris-flow fans by Shieh and Tsai; while the Bingham viscosity was determined using monitored velocity data. The rational combinations of parameters are proposed for the case studies.
Case studies in this research consist of several phases. First, data of debris flow cases such as topography and rainfall information from Chenyulan river basin during typhoon Herb, typhoon Toraji, and Fong-Shan during typhoon Toraji are compiled. Second, numerical simulation was performed using FLO-2D, results were presented as deposit area, maximum velocity, and debris volume. Simulation results are compared with aerial photos, microgeomorphology study and velocity estimated by previous researchers. And then, suitable conditions for using this model and suggestions for future research are proposed. The proposed method appears to be helpful to deciding hazard zone, judgement of emgineering, planning of evacuation and shelter.
Subjects
土石流
數值模擬
流變參數
FLO-2D
陳有蘭溪
豐山地區
Debris Flow
Numerical Simulation
Rheological Parameters
Chenyulan river
Fong-Shan
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-R93521117-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):65e4951b6d2a6efc925dff81906bb890