利用桑沟湾海带播苗前和成熟期的海流剖面资料,对最显著的M2分潮流椭圆四要素(最大流速、椭圆率、最大流速方向和最大流速出现时间)的垂直分布特征进行对比分析,结果表明筏式海带养殖对潮流垂直结构有显著影响,由海带播苗前的单一海底边界层,变为海带成熟期的海表和海底双重边界层。海带播苗前,M2分潮流椭圆要素在垂向上变化不大;而在海带成熟期,从中层向海面和海底,最大流速迅速减小、椭圆率逐渐增大、最大流速方向左偏、最大流速出现时间提前。湾口中部的最大流速方向从海带播苗前的南北方向转为海带成熟期的西北—东南方向,这是由水位梯度的变化造成的。
Abstract
The vertical distribution of tidal ellipse parameters (amplitude of the major axis, ellipticity, direction and phase) of the dominant M2 tidal current in Sanggou Bay are analyzed based on in-situ observed current profile data during kelp-free and kelp-mature periods. The results indicate that the suspended kelp culture has a remarkable effect on vertical structure of tidal current. The parameters of M2 tidal ellipse vary little in the vertical direction during kelp-free period. In contrast, due to the impact of the suspended kelp, the M2 tidal ellipse parameters show a significant vertical variation during kelp-mature period. Specifically, moving away from the middle layer towards both surface and bottom boundary layers, the maximum velocity decreases rapidly, the ellipticity increases, the direction of the maximum velocity veers clockwise and the appearing time of maximum velocity becomes earlier. The observed data also indicate that at the middle entrance of Sanggou Bay, the direction of the maximum velocity turns from the north-south direction during the kelp-free period to the northwest-southeast direction during the kelp mature period, which was found to be caused by the relevant change of sea level gradient.
关键词
桑沟湾 /
筏式海带养殖 /
潮流垂直结构 /
M2分潮
Key words
Sanggou Bay /
suspended kelp culture /
vertical tidal current structure /
M2 tidal current
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基金
国家重点基础研究发展计划项目资助(2011CB409803)