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首页> 外文学位 >Modelling waves and currents in northeastern Lake Ontario to assess the impacts of a proposed offshore wind farm.
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Modelling waves and currents in northeastern Lake Ontario to assess the impacts of a proposed offshore wind farm.

机译：对东北安大略湖的海浪和海流进行建模，以评估拟建海上风电场的影响。

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摘要

A spectral wave model (SWAN) coupled with a depth averaged hydrodynamic model (Delft3D) was used to understand the wave and flow dynamics of the Kingston Basin of Lake Ontario during large winter storm events. This model was then used to assess the impact of an offshore wind farm in the Kingston Basin. Results over different model domains with various forcing methods were compared to achieve the highest correlation with wave, current and water level observations from several locations. Storm events were modelled over the complex bathymetry of the basin and results were verified using wave and current profiler data collected during the winters of 2009-10 and 2011-12. Waves were composed of both locally generated wind sea and swell from the main basin of Lake Ontario, while flows throughout the Kingston Basin showed a complex circulation pattern. This circulation is composed of several wind-driven gyres, which are magnified during storm events. The impact of waves on the circulation patterns within the basin is highest in shallow areas where wave breaking drives circulation. To simulate a wind farm, a transmission coefficient was used in the wave model to represent the effects on waves, and an energy loss term was added to the hydrodynamic momentum equations to represent the added drag of the piles on the circulation. The results indicate that the coastal areas in eastern Lake Ontario will be minimally affected. The headlands of Big Sandy Bay, Wolfe Island, could see the largest coastal effects with changes in significant wave height predicted to be < 2%. The majority of impacts to circulation occur in the near-field, with changes in current magnitude of < 0.08 m s-1 (up to 50%). Areas near Wolfe Island exhibit changes of ∼ 0.05 m s-1 (30 %), although overall circulation patterns throughout the basin are not affected. The majority of changes to surface waves and wind-driven currents are due to wind farm position with respect to wind direction and the re-direction of flows and waves as they pass through the wind farm.
机译：光谱波模型（SWAN）与深度平均流体动力学模型（Delft3D）结合使用，以了解大型冬季暴风雨期间安大略湖金斯敦盆地的波浪和流动动力学。然后，该模型用于评估金斯敦盆地近海风电场的影响。比较了使用各种强迫方法在不同模型域上的结果，以实现与在多个位置的波浪，水流和水位观测值的最高相关性。在盆地的复杂测深上模拟了风暴事件，并使用在2009-10和2011-12冬季收集的海浪和电流剖面数据验证了结果。波浪是由本地产生的风海和安大略湖主盆地的涌浪组成，而整个金斯敦盆地的水流则显示出复杂的环流模式。这种环流由数个由风驱动的旋流组成，在暴风雨时会放大。波浪对盆地内环流模式的影响在波浪驱使环流的浅层区域最大。为了模拟风电场，在波浪模型中使用了传输系数来表示对波浪的影响，并且将能量损失项添加到了水动力方程中，以表示桩在循环中增加的阻力。结果表明，安大略湖东部的沿海地区受到的影响最小。沃尔夫岛大桑迪湾的岬角可能会受到最大的沿海影响，预计波高的变化<2％。对循环的大部分影响都发生在近场，其电流幅值变化小于0.08 m s-1（高达50％）。沃尔夫岛附近地区的变化约为0.05 m s-1（30％），尽管整个盆地的整体环流模式均不受影响。地表波和风力驱动流的大部分变化是由于风电场相对于风向的位置以及流经风电场的流和波的重新定向而引起的。

著录项

  • 作者

    McCombs, Matthew.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Engineering Civil.;Hydrology.
  • 学位 M.A.Sc.
  • 年度 2013
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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