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

Robin Davidson-Arnott, Irene Delgado-Fernandez, Bernard Bauer, Patrick Hesp, Jeff Ollerhead, Ian Walker

Research output: Contribution to conferenceAbstract

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.
Original languageEnglish
Publication statusAccepted/In press - 3 Jan 2016
EventInternational Coastal Symposium 2016 - Sydney, Australia
Duration: 6 Mar 201611 Mar 2016

Conference

ConferenceInternational Coastal Symposium 2016
CountryAustralia
CitySydney
Period6/03/1611/03/16

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    Davidson-Arnott, R., Delgado-Fernandez, I., Bauer, B., Hesp, P., Ollerhead, J., & Walker, I. (Accepted/In press). Test of a Model to Predict Sediment Transport to the Foredune Using a Supply-limited Approach. Abstract from International Coastal Symposium 2016, Sydney, Australia. https://ics2016.org/