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首页> 外文期刊>Ocean Engineering >Flow field impact assessment of a tidal farm in the Putuo-Hulu Channel
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Flow field impact assessment of a tidal farm in the Putuo-Hulu Channel

机译：Putuo-Hulu频道潮汐场的流场影响评价

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Waters surrounding Zhoushan Archipelago have the most abundant tidal current energy in China, which makes it a promising site for tidal farm construction in the future. Before deploying tidal current turbines, the potential environmental impacts on surrounding waters must be evaluated. In this work, we focus on the flow field impact assessment of an assumed tidal farm installed in Zhoushan Putuo-Hulu Channel. First, in order to evaluate the tidal characteristics there, a 2-month ADCP campaign is carried out, and a 3-D hydrodynamic model is established and validated with the in-situ measurements. Additionally, tidal current velocity and water depth as well as flow heading asymmetry information are used to evaluate the tidal stream exploitability within this channel. Second, a tidal farm consisting of 115 turbines is planned and assumed to be deployed throughout this channel. Blade element momentum method is used to numerically characterize the flow-turbine interactions, and then the spatial-temporal flow field variations caused by the assumed tidal farm are evaluated. It can be seen from the results that the peak flow speed reduction produced by the tidal farm could be over 0.5 m/s within the wake zones, while the flow velocity increment along two islands could reach 0.6 m/s. In particular, a flow speed phase shift phenomenon can be observed. Besides, the water level experiences a small overall rise, and the difference compared with the reference is within +/- 3.0 cm. Moreover, the seabed shear stress within the wake zones could drop by 65%, while the areas along the two islands might see over 100% increase, indicating the risk of sediment deposition and coastal erosion.
机译：舟山群岛周围的水域在中国拥有丰富的潮汐热能，这使其成为未来潮汐农业建设的有希望的遗址。在部署潮汐当前涡轮机之前，必须评估对周围水域的潜在环境影响。在这项工作中，我们专注于在舟山普陀 - 霍鲁渠道安装的假定潮汐场的流场影响评估。首先，为了评估那里的潮汐特性，进行了2个月的ADCP广告系列，并建立了一个三维流体动力学模型并用原位测量验证。另外，使用潮流速度和水深以及流向不对称信息来评估该通道内的潮流剥削性。其次，计划和假设由115个涡轮机组成的潮汐场，并在整个通道中部署。叶片元件动量方法用于数值表征流动涡轮相互作用，然后评估由假定的潮汐场引起的空间流场变化。从结果可以看出，潮汐场产生的峰值流速减少可以在唤醒区内超过0.5米/秒，而沿两个岛屿的流速增量可以达到0.6米/秒。特别地，可以观察到流速相移现象。此外，水位经历较小的总体上升，与参考相比的差异在+/- 3.0厘米范围内。此外，唤醒区内的海底剪切应力可以下降65％，而两个岛屿的区域可能会看到超过100％的增加，表明沉积物沉积和沿海侵蚀的风险。

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