Tidal and intra-tidal sand transport processes across a macrotidal intertidal zone, Broome, Western Australia: Implications for measurements of sand transport associated with coastal developments

Piers Larcombe, P. Huang, G. M. Pusey, M. O’Leary

Research output: Chapter in Book/Conference paperConference paper

Abstract

Sand transport was measured in the shallow subtidal zone of a macrotidal, seasonally waveinfluenced tropical setting, at Broome, northwest Australia, to inform the design of a proposed boating facility. For five weeks, waves and currents were measured in the subtidal zone, with LISST-100x and LISST-STx
instruments measuring in-situ particle size distributions (PSD) and settling velocities of mobilized sediment. Boat-based vertical profiles taken on the faster and longer ebb tide revealed very strong vertical gradients in PSD (sand concentrations in the basal 40 cm of 20-30 times that 1 m above bed and higher) and indicated some variation potentially due to the turbulent bursting process. The LISST in-situ particle size data was invaluable in understanding the sedimentary processes, assessing the uncertainties and lending weight to the conclusions. The potential long-term rate of sand flux was calculated to be ∼200,000 m3/yr towards the SSW, which, even taking the uncertainties into account, was likely to prove unmanageable in practical terms
Original languageEnglish
Title of host publicationScour and Erosion
Subtitle of host publicationProceedings of the 7th International Conference on Scour and Erosion
EditorsL. Cheng, H. An, S. Draper
PublisherCRC Press/Balkema
Pages773-781
Number of pages9
ISBN (Electronic)978-1-315-72359-4
ISBN (Print)978-1-138-02732-9
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event7th International Conference on Scour and Erosion - Perth, Australia
Duration: 2 Dec 20144 Dec 2014

Conference

Conference7th International Conference on Scour and Erosion
CountryAustralia
CityPerth
Period2/12/144/12/14

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