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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Tidal energy resource complexity in a large strait: The Karori Rip, Cook Strait
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Tidal energy resource complexity in a large strait: The Karori Rip, Cook Strait

机译：大海峡的潮汐能源资源复杂性：库克海峡的卡罗里河

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摘要

Successful extraction of tidal stream energy will require a good understanding of flow at a range of scales, including those relating to average energy, variability in energy supply and fatigue. Current and turbulence measurements from the Karori Rip area of Cook Strait, the prime focal region of open-water tidal stream electricity generation in New Zealand, are described. A key issue is that a significant portion of the energy is contained in waters deeper than normally considered for energy extraction. Here we compare shallow and deep sites. Velocity data were derived from acoustic Doppler current profiler moorings, as well as spatial surveys and show flow magnitudes reaching 3.4ms~(-1) in the shallow regions. The maximum speeds in both shallow and deep sites were typically located in the upper part of the measured water column although moored acoustic Doppler current profiler (ADCP) observations showed some complexity in this regard. Benthic boundary-layers were resolved in the bottom ~20m of the water column. Measured turbulent kinetic energy dissipation rates ε exceeded 10~(-5)m ~2s~(-3) and estimated maximum ε is a factor of 10 greater. This was not distributed evenly through the water column, with stratification and velocity shear clearly persisting, especially around the turn of the tide. The implications for tidal stream energy are that (i) there is sufficient energy resource in the region for a moderate sized array of turbines, (ii) the vertical variability in the flow speed suggests turbines that can operate near the surface would be more effective at accessing the resource, (iii) stratification may persist and influence the scales of turbulence and (iv) wave-current interaction effects will influence any near-surface structure as well as vessel operations
机译：成功提取潮汐流能量将需要对一系列尺度的流量有一个很好的了解，包括与平均能量，能源供应的可变性和疲劳有关的那些尺度。描述了库克海峡Karori Rip地区的电流和湍流测量，该地区是新西兰开放水域潮流发电的主要焦点区域。一个关键问题是，比正常情况下能量提取更深的水中所含能量的比例很大。在这里，我们比较浅层和深层站点。速度数据是从声学多普勒电流剖面仪系泊设备以及空间调查获得的，表明浅水区的流量大小达到3.4ms〜（-1）。浅水区和深水区的最大速度通常位于被测水柱的上部，尽管系泊声多普勒电流剖面仪（ADCP）的观测结果显示这方面有些复杂。底界边界层在水柱底部〜20m处解析。测得的湍流动能耗散率ε超过10〜（-5）m〜2s〜（-3），估计的最大ε大10倍。这在水柱中分布不均，分层和速度剪切作用明显持续，尤其是在潮汐转弯附近。潮汐流能的含义是：（i）该地区有足够的能量资源用于中等大小的涡轮机;（ii）流速的垂直变化性表明，可以在地表附近运行的涡轮机在以下情况下会更有效获取资源，（iii）分层可能会持续并影响湍流的规模;（iv）波流相互作用的影响将影响任何近地表结构以及船只的运行

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