Soroush Abolfathi, Jonathan Pearson


An experimental study has been conducted in a large scale basin at Danish Hydraulic Institute (DHI). Simultaneous measurements of hydrodynamics using Laser Doppler Anemometry (LDA) and fluorescent tracer studies were undertaken within the surfzone under a regular wave condition with waves approaching the shore at 20. Through a series of hydrodynamic and tracer measurements and their comparison with the existing theoretical values, this study quantifies the physical processes and their integrated effects on a solute tracer in the nearshore zone subject to combined waves and the induced longshore currents. A theoretical dispersion model has been developed, adopting both experimental and theoretical velocimetry approaches. The results of theoretical model have been compared to the tracer data. Using the results from this study together with all known previous studies of dispersion measurements within the surfzone, good agreement exists.


Coastal Mixing; Surfzone; Oblique Waves; Pollution

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BOWEN A. J. & INMAN D. L., 1974. Nearshore mixing due to waves and wave-induced currents. Rapp. P.-v. Reun. Cons. int. Explor. Mer, 167: 6-12.

BOWEN A. J., INMAN D. L. & SIMMONS V. P., 1968. Wave „set-down‟ and „set-up‟. J. geophys. Res. 73, 2569-2577.

CHIKWENDU S.C., 1986. Calculation of longshore shear dispersivity using an N-zone model as . J. Fluid Mech., 167, 19-30.

CICIN-SAIN, B., BERNAL, P., VANDEWEERD, V., BELFIORE, S. and GOLDSTEIN, K., 2002. A Guide to Oceans, Coasts and Islands at the World Summit on Sustainable Development: Integrated Management from Hilltops to Oceans. Newark, Delaware: Center for the Study of Marine Policy.

CREEL, L, 2003 Ripple Effects: Population and Coastal Regions, Population Reference Bureau (, Date accessed July 2012

CLARK, D. B., F. FEDDERSEN, AND R. T. GUZA, 2010: Cross-shore surfzone tracer dispersion in an alongshore current. J. Geophys. Res., 115,

DEVRIEND H. J. & STIVE M. J. F., 1987. Quasi-3D modelling of nearshore current. Coastal Engng., 11, 565-601.

DYHR-NIELSEN, M. & SORENSEN, T. 1970. Some sand transport phenomena on coasts with bars. ASCE, Proceedings 12th Int. Conf. on Coastal Eng.: 855-865.

FISCHER H. B., LIST J. E., KOH R. C. Y., IMBERGER J., BROOKS N. H., 1979. Mixing in inland and coastal waters. New York: Academic Press.

GALVIN C. J., 1972. Wave breaking in shallow water. Waves on Beaches, edited by R. E. Meyer, Academic Press, New York, 413-455.

GORING, D., NIKORA, V. De-spiking ADV data. Journal of Hydraulic Engineering, ASCE, 2002, 128(1), 117-126

GRANT. S. B, KIM. J. H, JONES B. H, JENKINS. S. A, WASYL. J & CUDABACK. C., Surfzone entrainment, along-shore transport, and human health implications of pollution from tidal outlets. Journal of Geophysical Research, vol 110, C10025.

Guza, R.T., Thornton, E. B., 1982, „Swash Oscillations on a Natural beach‟, Journal of geophysical research, 87(C1), pp483-491

HANSEN J. B. & SVENDSEN I. A., 1984. A theoretical and experimental study of undertow. Proc. 19th Int. Conf. Coastal Engng., 2246-2262.

HARRIS T. F. W., JORDAN J. M., MCMURRY W. R., VERWEY C. J. & ANDERSON F. P., 1963. Mixing in the surf zone. Int. J. Air Wat. Pollut., 7: 649-67.

INMAN D. L., TAIT F. J. & NORDSTROM C. E., 1971. Mixing in the surf zone. J. geophys. Res., 76: 3493 3514.

LONGUET-HIGGINS M. S., 1953. Mass transport in water waves. Proc. Cambridge Philo. Soc., 245, 535-581.

LONGUET-HIGGINS M. S., 1970. Long-shore currents generated by obliquely incident sea waves, parts 1 and 2. J. geophys. Res., 75: 6778-6801.

LONGUET-HIGGINS M. S., 1972. Recent progress in the study of longshore currents. Waves on Beaches, edited by R. E. Meyer, Academic Press, New York, 203-248.

LONGUET-HIGGINS M. S. & STEWART R. W., 1960. Changes in the form of short gravity waves on long waves and tidal currents. J. Fluid Mech., 13, 481-504.

LONGUET-HIGGINS M. S. & STEWART R. W., 1964. Radiation stress in water waves, a physical discussion with application. Deep-Sea Res., 11, 529-563.

NADAOKA k., KONDOH T., 1982. Laboratory measurements of velocity field structure in the surfzone by LDV. Coastal Engng. Japan, 25,125-145.

PEARSON J. M., GUYMER I., COATES L. E., WEST J. R., 2002. Effect of wave height on cross- shore solute mixing. J. Wtrwy., Port, Coast., and Oc. Engng., ASCE, 128, 11-21.

PEARSON J.M., GUYMER I., COATES L.E., WEST J.R., 2009. “On-off shore Solute Mixing in the Surf Zone”. Journal of Wtrwy., Port, Coast., and Oc. Engng., ASCE.

PEARSON J.M., GUYMER I., KARAMBAS T.V. PETERSEN O.S., 2006. Laboratory investigation of Mixing in the Nearshore. Proc. 30th Int. Conf. Coastal Eng. San Diego

PRANDTL L., 1952. Essentials of Fluid Dynamics. Hafner Publishing Company, New York. RUTHERFORD J. C., 1994. River Mixing. J. Wiley & Sons, Chichester, England.

STIVE, M.J.F., 1984. Energy dissipation in waves breaking on gentle slopes Coastal Engineering, 8: 99-127

STOKES G., 1847. On the theory of oscillatory waves. Transactions of the Cambridge Philosophical Society ,VIII, 314-326.

SVENDSEN I. A., 1987. Analysis of surf zone turbulence. J. geophys. Res., 92, 5115-5124. SVENDSEN I. A. & PUTREVU U., 1994. Near-shore mixing and dispersion. Proc. R. Soc. London, Ser. A, 445, 561-576.

SVENDSEN I. A. & LORENZ R. S., 1989. Velocities in combined undertow and longshore currents. Coastal Engng., 13, 55-79.

TAYLOR G. I., 1954. The dispersion of matter in a turbulent flow through a pipe. Proc. R. Soc. London, Ser. A, 223, 446-468.

TANAKA H., WADA A., KOMORI S. & TEKEUCHI I., 1980. Effects of nearshore currents on diffusion in the surf zone. Coastal Engng. Japan, 23, 231-50.

THORNTON E. B., 1970. Variation of long-shore currents across the surf zone. Proc. 12th Int. Conf. on Coastal Engng., Washington, 291-308.

TING, F. C. K. and KIRBY, J. T., 1994, ``Observations of undertow and turbulence in a laboratory surfzone'', Coastal Engineering, 24, 51-80.

TING, F. C.-K. and KIRBY, J. T., 1995, ``Dynamics of surf-zone turbulence in a strong plunging breaker'', Coastal Engineering, 24, 177-204.

TING, F. C. K. and KIRBY, J. T., 1996, "Dynamics of surf-zone turbulence in a spilling breaker'', Coastal Engineering, 27, 131-160.

VERLAAN M., 1997. Storm surge forecasting using Kalman filtering. Journal of Meteorological society of Japan.75, 195-208.