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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Vertical structure of tidal current in a typically coastal raft-culture area
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Vertical structure of tidal current in a typically coastal raft-culture area

机译：典型沿海筏养殖区的潮流垂直结构

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In this paper vertical structure of tidal current in a typically coastal raft-culture area is discussed by field measurement and a numerical model. The observations show that the vertical structure changed dramatically. A tidal surface boundary layer (SBL) is well formed due to the frictional effects induced by extensive, high-density suspended culture as surface obstruction. Both the aquaculture drag and the bottom friction are much higher than those in non-raft-culture areas, and show an obvious variation with tidal flow. The significant earlier ebbing and earlier flooding appear in the upper water column instead of the seabed. And the maximal phase lag is about 1 h within one tide cycle. A 1D hydrodynamic model was modified to include the SBL and parameterized with the field data. It replicated the observed velocity profile and was then used to investigate the impacts of varying culture density and bottom friction on the vertical tidal-current structure. Modeling results indicate that the surface current velocity was largely damped because culture activities enhanced the frictional effects on flow intensively. The magnitude and vertical structure of tidal current are determined together with aquaculture drag and bottom friction. In addition, the vertical velocity structure has a nonlinear trend along with culture density and bottom friction. This study is a theoretical foundation for optimizing aquaculture configuration through regulating culture density and species distribution.
机译：本文通过现场测量和数值模型讨论了典型沿海筏养殖区的潮流的垂直结构。观察表明，垂直结构发生了巨大变化。由于广泛的高密度悬浮培养物作为表面障碍物而产生的摩擦效应，使得潮汐表面边界层（SBL）形成得很好。水产养殖阻力和水底摩擦力都比非漂流养殖地区高得多，并且随着潮汐流量变化明显。明显的较早退潮和较早的洪水出现在高水位而不是海床。在一个潮汐周期内，最大相位滞后约为1小时。对一维水动力模型进行了修改，使其包含SBL，并使用现场数据进行了参数化。它复制了观察到的速度分布，然后用于研究变化的培养密度和底部摩擦对垂直潮流结构的影响。建模结果表明，由于培养活动增强了对水流的摩擦作用，因此大大降低了表面电流速度。潮流的大小和垂直结构与水产养殖阻力和底部摩擦力一起确定。另外，垂直速度结构与培养物密度和底部摩擦力具有非线性趋势。该研究是通过调节养殖密度和物种分布来优化水产养殖结构的理论基础。

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