Abstract
Abstract. Three debris-flow gullies, the Hong-Shui-Xian (HSX), Sha-Xin-Kai (SXK), and Xin-Kai-Dafo (XKD) gullies, located in the Shinfa area of southern Taiwan, were selected as case studies on the discharge of landslide-induced debris flows caused by Typhoon Morakot in 2009. The inundation characteristics of the three debris flows, such as the debris-flow volume V, deposition area Ad, and maximum flow depth, were collected by field investigations and simulated using the numerical modeling software FLO-2D. The discharge coefficient cb, defined as the ratio of the debris-flow discharge Qdp to the water-flow discharge Qwp, was proposed to determine Qdp, and Qwp was estimated by a rational equation. Then, cb was calibrated by a comparison between the field investigation and the numerical simulation of the inundation characteristics of debris flows. Our results showed that the values of cb range from 6 to 18, and their values are affected by the landslide ratio RL. Empirical relationships for cb versus RL, Qdp versus Qwp, Qdp versus V, and Ad versus V are also presented.
Subject
General Earth and Planetary Sciences
Reference45 articles.
1. Berti, M., Genevois, R., Simoni, A., and Tecca, P. R.: Field observation of a debris flow event in the Dolomites, Geomorphology, 29, 265–274, 1999.
2. Bovis, M. J. and Jakob, M:. The role of debris supply conditions in predicting debris flow activity, Earth Surf. Proc. Landf., 24, 1039–1054, 1999.
3. Calligaris, C. and Zini, L.: Debris flow phenomena: a short overview? Earth Sciences, Chap. 4, edited by: Imran Ahmad Dar, ISBN: 978-953-307-861-8, InTech., 2012.
4. Četina, M., Rajar, R., Hojnik, T., Zakrajšek, M., Krzyk, M., and Mikoš, M.: Case Study: Numerical Simulations of Debris Flow below Stože, Slovenia, J. Hydraulic Eng., 132, 121–130, 2006.
5. Chen, J. C., Jan, C. D., and Lee, M. S.: Reliability analysis of design discharge for mountainous gully flow, J. Hydraulic Res., 46, 835–838, 2008.
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