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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) FULL PAPERS : THEME 3- SEDIMENT MANAGEMENT AND MORPHODYNAMICS : EFFECTS OF RIVER MORPHOLOGICAL CHANGE ON INUNDATION MODELLING DURING EXTREME FLOOD SEQUENCES
EFFECTS OF RIVER MORPHOLOGICAL CHANGE ON INUNDATION MODELLING DURING EXTREME FLOOD SEQUENCES
Author : MINGFU GUAN , NIGEL WRIGHT & ANDY SLEIGH
Flooding modelling has generally concentrated on clear-water simulation without the incorporation of morphological change. However, field evidence shows that extreme floods can cause significant changes in the river channel. Increasingly attention has been paid to the influences of morphological changes within floods. Yet, the significance of morphological changes on inundation modelling is still unclear and debated in the research community. A sequence of floods might result in much more severe channel adjustments which will influence flood dynamics more significantly. Existing studies have left largely unexplored the effects of cumulative morphological changes on inundation modelling during extreme flood sequences. To extend knowledge in this field, this study explores how morphological changes affect flood hydraulics during a sequence of extreme floods and how the channel adjustments resulting from an event influence the hydrodynamics of the next event. A recently updated 2D hydro-morphodynamic model is used to simulate a series of hypothesised scenarios with and without river morphological change within a sequence of glacial outburst floods in southern Iceland. The full-scale river channel is 9 km long with width varying from 100m to 500m. The results show that the river morphological changes have much more significant impacts on flood dynamics during the latter floods of the sequence; thus, the necessity to consider a sequence of events is demonstrated. The assumption of unchanging of river morphology during inundation modelling might be open to question.
File Size : 1,187,007 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) FULL PAPERS
Article : THEME 3- SEDIMENT MANAGEMENT AND MORPHODYNAMICS
Date Published : 18/04/2016
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