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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 7: Hydroinformatics : Coupled 2d modelling of tangjiashan landslide dam breach
Coupled 2d modelling of tangjiashan landslide dam breach
Author : Wei Huang, Zhiyuan Yue, Zhixian Cao, and Gareth Pender
The Tangjiashan landslide dam, generated by the 2008 Wenchuan earthquake in Sichuan Province, is composed of heterogeneous sediments. Simplified mathematical models have been used to model the dam breach and the flood. However, it remains hard to identify the errors due to simplifications in the models, rendering the agreement between modelling and observations open to question. Here a physically enhanced, coupled 2D mathematical model is extended by implementing a multiple-sized sediment transport model for graded sediments in order to resolve the Tangjiashan landslide dam breach and the flood. The model is built upon the complete shallow water hydrodynamic equations and the HLLC approximate Riemann solver. Both erosion and mass collapse are accounted for. In comparison with the observed data, the widening and deepening of the breach as well as the flood hydrographs are reproduced rather well by the present model when the heterogeneity of the dam material is properly incorporated.
File Size : 271,566 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 7: Hydroinformatics
Date Published : 01/07/2011
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