應用地貌及降雨綜合指標於土石流發生位置及時間之潛勢評估

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應用地貌及降雨綜合指標於土石流發生位置及時間之潛勢評估

Application of a Topography-Rainfall Combination Index in Assessing Spatial-Temporal Debris-Flow Occurrence Potential

安以欣 , Masters　　Advisor：詹錢登　　

英文

none ； topographical and rainfall factors ； debris flow hazards ； Chenyulan watershed

Abstract │ Reference (37) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Debris flow occurrence is more frequent in central Taiwan, because of its topographic and hydroclimatic characteristics. GIS was used to identify the different characteristics of the 69 gullies which includes the catchment area, stream gradient, stream length, elevation, slope and the use of Inverse Distance Weight (IDW) for rainfall interpolation. The purpose of this study is to determine the debris flow hazard quantitatively with the help of a combination index, as well as topographical and rainfall factors. 
The study area is Chenyulan watershed in Taiwan because of the numerous recorded debris flow occurrence and availability of rainfall data for the chosen period. In July 2001 rainfall brought by Typhoon Toraji triggered a number of debris flow and caused many of casualties and property damages in the watershed. The data of this rainfall event has been used in this study to determine the rainfall intensity and effective accumulated rainfall. The 40-m DTM was used to determine the catchment area, gradients, elevation and stream length.
The result of the topographical and rainfall factors of the 69 gullies were mapped to determine the risk probability using the prediction factor conditions. The relationship of T and R shows that 29% of the total gullies lies in the red zone or the high risk probability of debris flow occurrence. Thus, gullies with high topographical and rainfall factors are likely to have the higher the probability of debris flow occurrence.

Reference ( 37 ) 〈TOP〉

1. Anderson S. and Sitar N., 1995. Analysis of rainfall-induced debris flows. J. Geotechnical Engineering 121(7): 544-552
連結：
2. Bovis M. and Jakob M., 1999. The role of debris supply conditions in predicting debris flow activity. Earth Surface Processes and Landforms 24: 1039-1054.
連結：
3. Brayshaw D. and Hassan M., 2009. Debris flow initiation and sediment recharge in gullies. Geomorphology 109: 122-131.
連結：
4. Chang T.C. and Chao R.J., 2006. Application of back-propagation networks in debris flow prediction. Engineering Geology 85: 270-280.
連結：
5. Chen H., Dadson S. and Chi Y.G., 2006. Recent rainfall-induced landslides and debris flow in northern Taiwan. Geomorphology 77: 112-125.
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