IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : Modelling and Understanding Multiple Roles of Sediment Transport in Floods
Modelling and Understanding Multiple Roles of Sediment Transport in Floods
Author : Mingfu Guan, Nigel G. Wright and P. Andrew Sleigh
Outburst floods are characterised by being sudden, short-lived and containing high energy. Such kinds of outburst floods generally comprise an intense advancing water wave which can induce considerable sediment loads. Therefore, it is necessary to incorporate sediment transport effects in flood models, instead of just considering water flow. In this paper, a layer-based morphodynamic model is presented. Of course, a model can never represent all the features in the real world exactly; the model h ere is mainly developed for sheet flow. The model system is composed of a combination of several modules: 1) a hydrodynamic module governed by 2D Shallow Water equations involving sediment effects; 2) a sediment transport module controlling the mass conservation of sediment; 3) a bed deformation module for updatingthe bed elevation due to erosion and deposition. For applications, a small-scale dyke breach due to flow overtopping and a large-scale volcano-induced glacial lake outburst flood (GLOF) are simulated by the computational model. Modelling results indicate that sediment transport plays multiple roles in the hydraulic events.In some cases, it delays the onset of flow, changing the flow hydrograph. Nonetheless, in other cases, the flood propagation is accelerated due to the incorporation of sediment transport; conversely, the powerful outburst floods induce sediment into motion and cause rapid geomorphic change of river bed, e.g. millions of cubic meters of sediment are eroded and re-deposited for the volcano-induced GLOF event.
File Size : 770,392 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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