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Debris flow-induced topographic changes: effects of recurrent debris flow initiation
1Department of Civil and Water Resources Engineering, National Chiayi University, Chiayi, Taiwan. chienyuc@mail.ncyu.edu.tw.
Recurrent debris flows in Taiwan significantly alter landscapes, increasing stream power and landslide potential. Numerical simulations show debris flows enlarge affected areas and intensify peak discharges after repeated events.
Area of Science:
- Geosciences
- Hydrology
- Environmental Science
Background:
- Chushui Creek in Taiwan is prone to recurrent debris flows.
- Typhoon-induced rainfall events in 1996 and 2004 triggered significant debris flows.
Purpose of the Study:
- To analyze recurrent debris flow impacts using numerical modeling and GIS.
- To assess changes in topographic and hydrological characteristics post-debris flow.
Main Methods:
- Utilized the FLO-2D program for two-dimensional water flood and mudflow simulations.
- Employed Geographic Information System (GIS) for spatial analysis of topographic changes.
- Analyzed elevation, slope, aspect, Stream Power Index (SPI), Topographic Wetness Index (TWI), and Hypsometric curve integral (HI).
Main Results:
- Recurrent debris flows increased SPI and peak discharge in the basin.
- Higher TWI values correlated with steeper slopes, indicating increased landslide initiation potential.
- The Hypsometric curve integral (HI) suggested the basin is transitioning from mature to old stage.
- Numerical simulations revealed increased debris flow depth, affected area, flow rates, and peak discharge.
Conclusions:
- Recurrent debris flows significantly modify basin topography and hydrology.
- Debris flow events exacerbate the potential for future landslides and increase flow intensity.
- The basin's geomorphic stage is evolving due to repeated debris flow disturbances.
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