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Water 2017, 9(9), 705; https://doi.org/10.3390/w9090705

Flood Inundation Modelling of Flash Floods in Steep River Basins and Catchments

Hydro-environmental Research Centre, School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
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Received: 31 July 2017 / Revised: 4 September 2017 / Accepted: 12 September 2017 / Published: 15 September 2017
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Abstract

The potential flood inundation extent can be estimated with flood inundation models, which can differ in the level of physical and numerical modelling complexity included in the solution procedure. In recent years, several studies have highlighted the benefits of shock-capturing flood inundation models, particularly when modelling a high Froude number or supercritical flows, or in areas prone to the occurrence of rapidly varying flood events, such as flash floods. Nonetheless, decision makers are often reluctant to implement more complex modelling tools into practical flood inundation modelling studies, unless evidence is provided to establish when such refined modelling tools should be used. The main objective of this study was to determine a general threshold value of the bottom slope that could be used by decision makers as an orientation guide to ascertain when to use a specific type of flood inundation model. The results obtained suggest that in torrential river basins or catchments (i.e., river basins and catchments with a bed slope generally greater than 1%), the flood inundation modelling should be conducted by using a flood inundation model that include shock-capturing algorithms in the model solution procedure. View Full-Text
Keywords: flood inundation modelling; computational hydraulics; shock-capturing; flood risk; river basins; steep catchments flood inundation modelling; computational hydraulics; shock-capturing; flood risk; river basins; steep catchments
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Kvočka, D.; Ahmadian, R.; Falconer, R.A. Flood Inundation Modelling of Flash Floods in Steep River Basins and Catchments. Water 2017, 9, 705.

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