Abstract
Debris flow warning system in Taiwan uses effective accumulated precipitation as warning criteria. Little research studied the affected area associated with different accumulated precipitation. The Taipei DF024 potential debris flow torrent is used as an example to study the relation between affected area and accumulated precipitation. Three accumulated precipitations in 24 h, 300 mm, 500 mm (official warning criteria) and 700 mm, are chosen for comparison. Average rainfall intensity per hour is calculated from accumulated rainfall through the Monobe Formula. Total flow rate is estimated by the Rational Formula and discharge hydrograph. Maximum debris flow volume is determined by the Equilibrium Concentration Formula. From field investigation, all source of debris are distributed on landslide areas and river bed. DEBRIS-2D is used to simulate debris flows. The results show that hazard area is proportional to precipitation, and the thickness of maximum debris flow accumulation is between 1.62 m and 2.13 m. The relation between accumulated precipitation and hazard area can provide officials additional information on resident evacuation.
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Acknowledgments
The authors wish to thank Geotechnical Engineering Office, Public Works Department of Taipei City Government for financially supporting of this research and providing valuable survey data.
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Liu, KF., Wei, SC., Wu, YH. (2014).
The Influence of Accumulated Precipitation on Debris Flow Hazard Area.
In: Sassa, K., Canuti, P., Yin, Y. (eds) Landslide Science for a Safer Geoenvironment. Springer, Cham. https://doi.org/10.1007/978-3-319-04996-0_8
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DOI: https://doi.org/10.1007/978-3-319-04996-0_8
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