Experimental study on the depth-averaged mixing coefficient in longshore currents

ZOU Zhi-li; LI Liang; SUN He-quan; QIU Da-hong

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ZOU Zhi-li, LI Liang, SUN He-quan, QIU Da-hong. Experimental study on the depth-averaged mixing coefficient in longshore currents[J]. Haiyang Xuebao, 2009, 31(3): 137-148.

Citation:

ZOU Zhi-li, LI Liang, SUN He-quan, QIU Da-hong. Experimental study on the depth-averaged mixing coefficient in longshore currents[J]. Haiyang Xuebao, 2009, 31(3): 137-148.

ZOU Zhi-li, LI Liang, SUN He-quan, QIU Da-hong. Experimental study on the depth-averaged mixing coefficient in longshore currents[J]. Haiyang Xuebao, 2009, 31(3): 137-148.

Citation:

ZOU Zhi-li, LI Liang, SUN He-quan, QIU Da-hong. Experimental study on the depth-averaged mixing coefficient in longshore currents[J]. Haiyang Xuebao, 2009, 31(3): 137-148.

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Experimental study on the depth-averaged mixing coefficient in longshore currents

1.
State Key laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
2.
Dalian Naval Vessels Institute, People’s Liberation Army’s Navy, Dalian 116023, China

Received Date: 2009-01-19
Rev Recd Date: 2009-04-08

Abstract

Abstract

A laboratory experiment of measuring horizontal mixing coefficients was performed in the surfzone on two plane beaches with slopes 1:40 and 1:100 for regular waves.The transport and diffusion of a pointink in longshore currents were recorded by CCD cameras over the beach.Based on anapproximate analytical solution to the depth-averaged two-dimensional convection-diffusion equation,a method of calculating mixing coefficients using experiments data was developed.The result for mixing coefficients show that it only depends on the local water depth and not on the wave parameters such as periods and heights. The dispersion caused by the vertical variation of long shore currents leads to the long shore mixing coefficients much greater than the cross-shore mixing coefficients.The contribution of waves to cross-shore mixing coefficients accounts for 40%,and the rest is due to the turbulence produced by wave breaking.
- pollution,
- dispersion coefficients,
- long shore currents,
- mixing coefficients

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References(14)

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