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Effects of suspended culture of the seaweed Laminaria japonica aresch on the flow structure and sedimentation processes

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Abstract

The culture of suspended kelp, such as Laminaria japonica Aresch, has arisen in nearshore areas for approximately 30 years since the 1980s. This long-term activity has significant impact on the regional hydrodynamic and sedimentary environments. In this study the impact was investigated, based on synchronized multi-station data from continuous observations made within and around the culture area. In total, three current velocity profiles were identified inside and on the landward side of the culture area. Based on the current velocity profiles we calculated the boundary layer parameters, the fluxes of erosion/deposition, and the rate of sediment transport in different times at each observation site. Comparison between culture and non-culture periods showed that the presence of suspended kelp caused the reduction in the average flow velocity by approximately 49.5%, the bottom friction velocity by 24.8%, the seabed roughness length by 62.7%, and the shear stress and the flux of resuspended sediment by approximately 50%. From analyses in combination with the corresponding vertical variation of the suspended sediment distribution, it is revealed that the lifted sediments by resuspension is mixed with the upper suspended material, which will modify the regional distribution of suspended sediment. These changes in flow structure and sediment movement will accelerate seabed siltation, which corresponds to the changes in seabed erosion/deposition. However, under the influences of the seasonal changes in kelp growth the magnitude of change with the seabed siltation was not obvious inside the culture area, but a fundamental change was apparent around the culture area.

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Authors and Affiliations

  1. The Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, P. R. China

    Zehua Zhang, Haijun Huang, Yanxia Liu, Liwen Yan & Haibo Bi

  2. University of Chinese Academy of Sciences, Beijing, 100049, P. R. China

    Zehua Zhang

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  1. Zehua Zhang
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  2. Haijun Huang
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  3. Yanxia Liu
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  4. Liwen Yan
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  5. Haibo Bi
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Correspondence to Haijun Huang.

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Zhang, Z., Huang, H., Liu, Y. et al. Effects of suspended culture of the seaweed Laminaria japonica aresch on the flow structure and sedimentation processes. J. Ocean Univ. China 15, 643–654 (2016). https://doi.org/10.1007/s11802-016-2994-9

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  • DOI: https://doi.org/10.1007/s11802-016-2994-9

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