SPATIAL AND TEMPORAL VARIABILITY OF LONGSHORE TRANSPORT ALONG GOLD COAST, AUSTRALIA

Kristen D Splinter, Aliasghar Golshani, Greg Stuart, Rodger Tomlinson

Abstract


Spatial and temporal variability of longshore transport potential for a 35-km stretch of sandy coastline on the east coast of Australia is examined using a 25-year data set. Six-hourly offshore wave data is binned into yearly wave classes using a global k-means algorithm that accounts for wave height, period, and direction simultaneously. Wave class estimates are shoaled into the nearshore using MIKE 21 Spectral Wave (SW) model. Longshore transport is calculated using the formulas of Kamphuis (1991; 2002) and Bayram et al. (2007) and show good agreement with previously published estimates for the Gold Coast, suggesting the wave classification scheme sufficiently represents the variability in yearly wave data. Results show large temporal and spatial variability of transport potential along the coastline. Spatial variation is attributed to shoreline orientation and wave exposure, while temporal variability is significantly correlated with variations in the Southern Oscillation Index.

Keywords


: sediment transport; longshore transport; shoreline change; climate variability; Gold Coast, Australia

References


Bagirov, A. M. (2008). "Modified global k-means algorithm for minimum sum-of-squares clustering problems." Pattern Recognition, 41, 3192-3199http://dx.doi.org/10.1016/j.patcog.2008.04.004

Bayram, A., Larson, M., and Hanson, H. (2007). "A new formula for the total longshore transport sediment transport rate." Coastal Engineering, 54, 700-710http://dx.doi.org/10.1016/j.coastaleng.2007.04.001

Bertin, X., Castelle, B., Chaumillon, E., Butel, R., and Quique, R. (2008). "Longshore transporthttp://dx.doi.org/10.1016/j.csr.2008.03.005

Butel, R., Dupuis, H., and Bonneton, P. "Spatial Variability of Wave Conditions on the French Atlantic Coast using In-Situ Data." 7th International Coastal Symposium, Northern Ireland, 96-108.

Caires, S., and Sterl, A. (2005). "A New Nonparametric method to Correct Model Data: Application to Significant Wave Height from the ERA-40 Re-Analysis." Journal of Atmospheric and Oceanic Technology, 22, 443-459http://dx.doi.org/10.1175/JTECH1707.1

Colleter, G., Cummings, P., Aguilar, P., Walters, R., and Boswood, P. "Monitoring of Tweed River entrance, dredging and nourishment activities." Coastal and Ports Conference 2001, 259-264.

Cowell, P. J., Roy, P. S., and Jones, R. A. (1995). "Simulation of large-scale coastal change using a morphological behaviour model." Marine Geology, 126, 45-61 http://dx.doi.org/10.1016/0025-3227(95)00065-7

D'Agata, M., and Tomlinson, R. "Discussion of the dredging of the internal delta of Currumbin estuary and its impact on adjacent beaches." Ports and Coasts Australian Conference.

Dagnelie, P. (1975). "Analyse statistique a plusieurs variables." Les Presses agronomiques de Gembloux, diffusion Vnader-Oyez., 362

Delft Hydraulics Laboratory. (1970). "Gold Coast, Queensland, Australia - Coastal Erosion and Related Problems." 257, Delft Hydraulics Laboratory.

Delft Hydraulics Laboratory. (1992). "Southern Gold Coast Littoral Sand Supply." H85, Delft Hydraulics Laboratory.

DHL. (1992). "Southern Gold Coast Littoral Sand Supply." H85, Delft Hydraulics Laboratory.

Goodwin, I. D., Stables, M. A., and Olley, J. M. (2006). "Wave climate, sand budget and shoreline alignment evolution of the Iluka-Woody Bay sand barrier, northern New South Wales, Australia, since 3000 yr BP." Marine Geology, 226, 127-144http://dx.doi.org/10.1016/j.margeo.2005.09.013

Kamphuis, J. W. (1991). "Alongshore Sediment Transport Rate." Journal of Waterway, Port, Coastal, and Ocean Engineering, 117(6), 624-640 http://dx.doi.org/10.1061/(ASCE)0733-950X(1991)117:6(624)

Kamphuis, J. W. "Alonghsore transport of sand." 28th International Conference on Coastal Engineering, Cardiff, Wales, 2478-2491.

Patterson, D. C. "Sand Transport and Shoreline Evolution, Northern Gold Coast, Australia." 9th International Coastal Symposium, Gold Coast, Australia, 147-151.

Ranasinghe, R., McLoughlin, R., Short, A., and Symonds, G. (2004). "The Southern Oscillation Index, wave climate and beach rotation." Marine Geology, 204, 273-287http://dx.doi.org/10.1016/S0025-3227(04)00002-7

Turner, I. L., Leyden, V. M., Cox, R. J., Jackson, A., and McGrath, J. "Physical model investigations of an artificial reef for surfing and coastal protection - Gold Coast, Queensland, Australia."

Turner, I. L., Whyte, D., Ruessink, B. G., and Ranasinghe, R. (2007). "Observations of rip spacing, persistence and mobility at a long, straight coastline." Marine Geology, 236, 209-221http://dx.doi.org/10.1016/j.margeo.2006.10.029

van Enckevort, I. M. J., Ruessink, B. G., Coco, G., Suzuki, K., Turner, I. L., Plant, N. G., and Holman, R. A. (2004). "Observations of nearshore crescentic sandbars." Journal of Geophysical Research, 109(C6)http://dx.doi.org/10.1029/2003JC002214

van Rijn, L. C. (1993). Principles of Sediment Transport in Rivers, Estuaries, and Coastal Seas, Aqua Publications, Amsterdam. PMCid:1005200

Wright, L. D., and Short, A. D. (1984). "Morphodynamic variability of surf zones and beaches: A synthesis." Marine Geology, 56, 93-118 http://dx.doi.org/10.1016/0025-3227(84)90008-2


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