Journal
GEOMORPHOLOGY
Volume 129, Issue 3-4, Pages 387-397Publisher
ELSEVIER
DOI: 10.1016/j.geomorph.2011.03.002
Keywords
Debris flow; Terrain analysis; Digital terrain data; GIS
Funding
- National Science Council of Taiwan [NSC 95-2221-E-492-002]
- National Chiayi University [NCYU 97T001-05-04-002]
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Important factors for the initiation of debris flows include available loose sediment, torrential rainfall, and topographic conditions. The objective of this study is to identify topographic features of debris flows and conditions favorable for debris-flow initiation based on geomorphological analyses of 11 river basins in northern and central Taiwan. Morphometric indices were derived from 10-m grid digital terrain models before and after debris flow events using GIS. The indices include the stream power index (SPI), topographic wetness index (TWI), sediment transport capacity index, elevation-relief ratio, form factor, effective basin area, and slope gradient. The results show that debris flows tend to initiate from steep slopes or landslides with higher TWI values. Debris flows are expected in basins with higher SPI and TWI. Basins with lower slope gradients and SPI but higher TWI may also have a high potential for debris flow. SPI changes most significantly due to a debris flow event particularly in steep basins. (C) 2011 Elsevier B.V. All rights reserved.
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