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Application Of A 2d Hydrodynamic Model For Flood Inundation Mapping

Congress: 2015
Author(s):
AbstractThe Bowmont Water is a major tributary in the Tweed Catchment in the Scottish Boarders that drains the northern slopes of the Cheviot. The river system is one of the most diverse and changeable fluvial environments in the UK characterised by high rates of geomorphic changes associated with coarse sediment supply, large flood events and intensive land use. Extensive channel adjustments and management have led to increased risk of flooding. Identification of vulnerable areas at risk of flooding is therefore a priority in the catchment. Hydrodynamic modelling is a tool that can be applied for identifying areas at risk of flooding both within channel and its floodplain. However, modelling high flow events that cause flood inundation in a changing fluvial environment is challenging. Over the past decade, the use of advanced numerical modelling techniques have been boosted by advances in data acquisition techniques, the availability of high power computational facilities and development of efficient numerical solvers. In Bowmont, high resolution elevation data were acquired through an Unmanned Aerial Vehicle (UAV) survey recently. Using these data we created a Digital Elevation Model of the main channel and its floodplain and a two-dimensional model was developed to simulate flows within the complex topography of the river. Model parameters were optimised by simulating an observed high flow event and patterns of flow across the floodplain were verified using time series photographs taken by a webcam.
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