Event-parallel simulations of coastal morphological evolution

B.G. Williams, Vanesa Magar

Research output: Chapter in Book/Conference paperConference paper

Abstract

The ability of numerical coastal process models to describe the evolution of coastal features over timescales significantly greater than the incident hydrodynamic forcing remains fundamentally limited by computational power. This limitation is commonly addressed by applying a ‘scale factor’ to the model such that the simulated morphodynamic evolution becomes some multiple of the prototype timescale the simulation encompasses. Such techniques require simplification of the boundary conditions to just a few representative forcing conditions. In this paper we describe an acceleration technique that uses a genetic algorithm (GA) to simplify an incident wave climate to just a few representative conditions, based on the ability of the reduced wave climate to reproduce a target sediment transport pattern. The ability of the accelerated to reproduce the seasonal (order of months) evolution of the sand shoals and channel of a tidal inlet ebb delta is assessed against a ‘brute force’ simulation containing the full environmental forcing, and found to be highly dependent upon the number and variety of wave classes captured in the GA optimisation routine. Further research is on-going to assess the sensitivity and robustness of the GA optimisation process.
Original languageEnglish
Title of host publicationAustralasian Coasts and Ports Conference 2015
Subtitle of host publication22nd Australasian Coastal and Ocean Engineering Conference and the 15th Australasian Port and Harbour Conference
Place of PublicationAuckland, New Zealand
PublisherEngineers Australia
Pages946 - 952
Number of pages7
ISBN (Print)9781922107794
Publication statusPublished - 2015
Externally publishedYes
EventAustralasian Coasts & Ports Conference 2015: 22nd Australasian Coastal and Ocean Engineering Conference and the 15th Australasian Port and Harbour Conference - Pullman Hotel, Auckland, New Zealand
Duration: 15 Sept 201518 Sept 2015
http://www.coastsandports2015.com/

Conference

ConferenceAustralasian Coasts & Ports Conference 2015
Country/TerritoryNew Zealand
CityAuckland
Period15/09/1518/09/15
Internet address

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