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Characterisation of the wave field and associated risk of sediment resuspension in a coastal aquaculture zone

机译：沿海水产养殖区的波场特征和沉积物重悬的相关风险

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摘要

The interaction between extreme environmental events and the marine aquaculture industry has, in the past, led to substantial economic losses for the industry. In 1996, the aquaculture industry based near Port Lincoln in South Australia experienced a sediment resuspension event linked to the passage of a vigorous ex-tropical cyclone. A key process that drives the sediment dynamics in coastal environments is the physical forcing due to surface gravity waves. The numerical model Simulating WAves Nearshore (SWAN) has been applied to hindcast two years of wave fields for the central South Australian coastline and is validated against five datasets, using both in-situ observations and satellite derived wave heights. Using the calibrated model, we investigate the spatial variability in the relative contribution of locally generated wind waves versus incoming swell to the mean wave energy budget The potential for sediment resuspension is then assessed using theoretical thresholds for the initiation of sediment resuspension which are derived using the Shields parameter and observed sediment grain size. Linear wave theory in conjunction with the model hindcast is used to identify the conditions that could lead to a sediment resuspension event. Incoming swell from the Southern Ocean poses the greatest risk of a sediment resuspension event, while locally generated wind waves are only able to resuspend sediments in the shallow near shore regions. We have developed a simple tool that will allow policy makers and farm managers to identify the likely combination of significant wave height and mean wave period for a particular depth, that is likely to result in the mobilisation of unconsolidated particulate matter on the seafloor.
机译：过去，极端环境事件与海洋水产养殖业之间的相互作用已导致该产业的重大经济损失。 1996年，位于南澳大利亚州林肯港附近的水产养殖业经历了与剧烈的热带旋风的通过有关的沉积物再悬浮事件。在地表重力波的作用下，推动沿海环境沉积物动力学的关键过程是物理强迫。数值模拟近岸波浪（SWAN）已经应用于南澳大利亚中部海岸线的后两年的波场预报，并使用现场观测和卫星推导的波高对五个数据集进行了验证。使用校准的模型，我们调查了本地产生的风波相对于涌入的浪涌对平均波能量收支的相对贡献的空间变异性。然后使用理论阈值来评估沉积物重悬浮的潜力，该阈值是通过使用盾构参数和观察到的沉积物粒度。线性波理论与模型后预报一起用于确定可能导致沉积物再悬浮事件的条件。来自南大洋的涌入带来泥沙重新悬浮的最大风险，而本地产生的风波只能将泥沙重新悬浮在近岸浅水区。我们已经开发了一种简单的工具，使决策者和农场管理员可以确定特定深度的重要波浪高度和平均波浪周期的可能组合，这很可能导致未合并的颗粒物在海底上的流动。

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  • 来源
    《Ocean & coastal management》 |2012年第12期|16-26|共11页
  • 作者

    Emlyn M.Jones; Jochen Kaempf; Milena Fernandes;

  • 作者单位

    CSIRO: Marine and Atmospheric Research, GPO Box 1538, Hobart, Tasmania 7001, Australia,SARDI Aquatic Sciences, PO Box 120, Henley Beach, South Australia 5024, Australia,Aquafin CRC, PO Box 120, Henley Beach, South Australia 5024, Australia,Marine and Atmospheric Research, GPO Box 1538. Hobart. Tasmania 7001, Australia;

    School of the Environment, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia;

    SARDI Aquatic Sciences, PO Box 120, Henley Beach, South Australia 5024, Australia,Aquafin CRC, PO Box 120, Henley Beach, South Australia 5024, Australia,SA Water, GPO Box 1751, Adelaide, South Australia 5001, Australia;

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