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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/19609

Title: Quantifying Rainfall Controls on Catchment-Scale Landslide Erosion in Taiwan
Authors: Chen, Yi-Chin;Chang, Kang-Tsung;Chiu, Yu-Jia;Lau, Sze-Man;Lee, Hong-Yuan
Contributors: 地理學系
Keywords: Landslide erosion;Extreme rainfall;Landslide volume;Landslide material;Taiwan
Date: 2013-03
Issue Date: 2015-04-29T04:08:42Z
Publisher: Wiley
Abstract: Landslide erosion is a dominant hillslope process and the main source of stream sediment in tropical, tectonically active mountain belts. In this study, we quantified landslide erosion triggered by 24 rainfall events from 2001 to 2009 in three mountainous watersheds in Taiwan and investigated relationships between landslide erosion and rainfall variables. The results show positive power-law relations between landslide erosion and rainfall intensity and cumulative rainfall, with scaling exponents ranging from 2·94 to 5·03. Additionally, landslide erosion caused by Typhoon Morakot is of comparable magnitude to landslide erosion caused by the Chi-Chi Earthquake (MW = 7·6) or 22–24 years of basin-averaged erosion. Comparison of the three watersheds indicates that deeper landslides that mobilize soil and bedrock are triggered by long-duration rainfall, whereas shallow landslides are triggered by short-duration rainfall. These results suggest that rainfall intensity and watershed characteristics are important controls on rainfall-triggered landslide erosion and that severe typhoons, like high-magnitude earthquakes, can generate high rates of landslide erosion in Taiwan.
Relation: Earth Surface Processes and Landforms, 38(4): 372-382
Appears in Collections:[Department of Geography] Periodical Articles

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