Coastal infrastructure projects such harbours and marinas usually require the construction of breakwaters to maintain a stable entrance channel but they also interrupt the alongshore transport of sand resulting in accumulation of sand on the upstream section. In south-west Australia due to the presence of large offshore seagrass beds, wrack (dead seagrass leaves) accumulation has become a major environmental problem leading to the development mitigation options. In this paper, we present results from two contrasting locations as case studies: Port Geographe and Jurien Bay. Problems associated with seagrass wrack, a common feature in many tropical and subtropical regions are presented. Solutions to alleviate this problem through the development of a seagrass wrack transport model coupled to a morphological model are described.
|Title of host publication||Coastal structures 2019|
|Editors||Nils Goseberg, Torsten Schlurmann|
|Place of Publication||Karlsruhe|
|Publisher||Bundesanstalt für Wasserbau|
|Number of pages||10|
|Publication status||Published - 5 Dec 2019|
Pattiaratchi, C., & Wijeratne, S. (2019). Seagrass wrack and coastal structures: lessons from south-western Australia. In N. Goseberg, & T. Schlurmann (Eds.), Coastal structures 2019 (pp. 622–631). Karlsruhe: Bundesanstalt für Wasserbau. https://doi.org/10.18451/978-3-939230-64-9_062