Numerical modeling of debris flows and landslides triggered by an extreme rainfall event

Yuan Jung Tsai, Fang Tsz Syu, Shin Pin Lee, Chjeng Lun Shieh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The frequency of extreme rainfall corresponding with debris flows and large-scale landslides is increasing in the Taiwan. The traveling distance of debris flows get longer with increased sediment supply, and the hazard area is also larger than regular disaster situation. The debris flows can be considering as a mixture with solid phase and liquid phase. With a larger sediment supply in the dynamic process, the volume of fine sediment separating from solid phase is also larger, and so the state of liquid phase is change after fine sediment mix with water. This phenomenon contributes a significant effect on the mobility of debris flows and large-scale landslides. The composition of the mixture plays an important role in the analysis of the hazard area. In the present study, a two-dimensional numerical model is proposed to simulate the dynamic process of debris flows and landslides under different compositions of the mixture. The proposed was applied to simulate a case of extreme rainfall event, and the topographic data after disaster was used for verification. When the composition of the mixture included with fine sediment, the simulation of affected area had a good agreement with the real situation. The present study pointed out that the simulation of debris and landslide under extreme rainfall condition should consider the effect of fine sediment in the simulation condition.

Original languageEnglish
Title of host publicationDebris-Flow Hazards Mitigation
Subtitle of host publicationMechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation
EditorsJason W. Kean, Jeffrey A. Coe, Paul M. Santi, Becca K. Guillen
PublisherAssociation of Environmental and Engineering Geologists
Pages879-886
Number of pages8
ISBN (Electronic)9780578510828
Publication statusPublished - 2019 Jan 1
Event7th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Golden, United States
Duration: 2019 Jun 102019 Jun 13

Publication series

NameDebris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation

Conference

Conference7th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment
CountryUnited States
CityGolden
Period19-06-1019-06-13

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All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes
  • Water Science and Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Tsai, Y. J., Syu, F. T., Lee, S. P., & Shieh, C. L. (2019). Numerical modeling of debris flows and landslides triggered by an extreme rainfall event. In J. W. Kean, J. A. Coe, P. M. Santi, & B. K. Guillen (Eds.), Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation (pp. 879-886). (Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigation). Association of Environmental and Engineering Geologists.