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研究模型实验中采用浮子示踪法测量沙坝海岸裂流的方法,讨论了该方法的具体技术实现和测量结果的精度。实验中裂流由波浪在垂直岸线的直墙上的反射所形成的两列交叉的波浪生成。通过处理CCD图像的浮子轨迹得到了流场的详细速度分布,如旋涡分布等,显示了该方法优于流速仪定点测量的一些特点。与ADV流速仪测量结果的对比表明,由浮子轨迹得到的表层平均流速具有可靠的精度,特别是也可以应用于波浪破碎产生的裂流这样复杂流场的测量。
In the model experiment, a float tracer method was used to measure the rivulet on the coast of the sand dam. The realization of the technique and the accuracy of the measurement results were discussed. In the experiment, the split stream was generated by two intersecting waves formed by the reflection of the wave on the straight wall of the vertical shoreline. By processing the float trajectory of the CCD image, the detailed velocity distribution of the flow field, such as the vortex distribution, is obtained, which shows that the method is superior to the fixed point measurement of the flowmeter. The comparison with the ADV flowmeter shows that the average velocities of the surface layer obtained from the trajectories of the floats are reliable and can be applied to the complicated flow fields such as the rifting caused by the wave breaking.