沿岸流中混合系数的实验研究

邹志利; 李亮; 孙鹤泉; 邱大洪

沿岸流中混合系数的实验研究

1.
二程国家重点实验室,辽宁大连,116023
2.
中国人民解放军海军大连舰艇学院,辽宁大连,116023

基金项目: 国家自然科学基金资助项目(50479053;10672034)

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- 文章访问数: 1296
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出版历程
- 收稿日期: 2009-01-19
- 修回日期: 2009-04-08

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

摘要

摘要: 进行了在规则波作用下破波带内水平混合系数测量的物理模型实验。通过在沿岸流流场中投放墨水点源和采用CCD摄像机摄像,测量了点源扩散过程。利用水深平均二维扩散方程近似解析解得到了由实验结果计算混合系数的方法。实验结果表明:扩散系数仅依赖于当地水深,与波浪参数(周期和波高)无关。沿岸流沿水深变化产生的离散作用导致顺流方向(纵向)混合系数远大于横流方向(横向)混合系数。横流方向混合系数中由波浪产生的扩散系数占总扩散系数约40%,其余为波浪破碎引起的湍流产生的扩散系数。
- 污染物 /
- 离散系数 /
- 波生流 /
- 混合系数
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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参考文献(14)

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