Test of a Model to Predict Sediment Transport to the Foredune Using a Supply-limited Approach

Davidson-Arnott, Robin, Delgado-Fernandez, Irene, Bauer, Bernard, Hesp, Patrick, Ollerhead, Jeff and Walker, Ian (2016) Test of a Model to Predict Sediment Transport to the Foredune Using a Supply-limited Approach. International Coastal Symposium 2016, 06-11 March 2016, Sydney, Australia.

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Official URL: https://ics2016.org/

Abstract

Prediction of sand transport from the beach to the dune has generally been modelled using wind data from a nearby weather station assuming transport-limited conditions. On mid-latitude coasts sand transport often occurs under supply-limited conditions and measured deposition in the foredune is generally much smaller than predicted. Delgado-Fernandez (2011) developed a modelling approach that incorporated reductions in transport due to factors limiting supply, including the fetch effect, surface moisture and the presence of snow. Application of the model is restricted because of the rich data set on supply-limiting variables from which it was developed – hourly values based on a camera monitoring system. Here we test whether the modelling approach can be simplified to provide robust estimation of annual sand supply to the foredune using only meteorological data from a weather station, tide tables and simple representations of the beach morphology. Testing of the model is being carried out in two stages. In the first stage we use data from a nearby weather station to predict sand transport and the effects of supply-limiting variables at the same location and for the same period used to develop the Delgado-Fernandez model. This permits calibration of the weather station model against the original model output. In the second stage the weather station model is applied to data for the same period for another site about 2 km away with differing beach width and orientation. It is then run for three previous years for the two sites. In this stage the success of the model is evaluated by comparing the total predicted transport to the magnitude of annual sand deposition at each of the two sites.

Item Type: Conference or Workshop Item (Paper)
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Geography, Earth and Environmental Sciences
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Date Deposited: 06 May 2016 11:11
URI: http://repository.edgehill.ac.uk/id/eprint/7722

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