1. Tidal energy generators have the potential to injure or kill marine animals, including small cetaceans, through collisions with moving turbine parts. Information on the fine scale behaviour of animals close to operational turbines is required to inform regulators of the likely impact of these new technologies.
2. Harbour porpoise movements were monitored in three dimensions around a tidal turbine for 451 days between October 2017 and April 2019 with a 12-channel hydrophone array.
3. Echolocation clicks from 344 porpoise events were localized close to the turbine. The data show that porpoises effectively avoid the turbine rotors, with only a single animal clearly passing through the rotor swept area while the rotors were stationary, and none passing through while rotating.
4. The results indicate that the risk of collisions between the tidal turbine and porpoises is low; this has important implications for the potential effects and the sustainable development of the tidal energy industry.

中文翻译：

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港湾鼠海豚表现出局部躲避潮汐涡轮机

1. 潮汐能发电机有可能通过与移动的涡轮机部件碰撞而伤害或杀死海洋动物，包括小型鲸​​类。需要有关靠近运行涡轮机的动物的精细行为的信息，以告知监管机构这些新技术可能产生的影响。
2. 在 2017 年 10 月至 2019 年 4 月期间，使用 12 通道水听器阵列在潮汐涡轮机周围的三个维度上监测了港湾鼠海豚的运动，为期 451 天。
3. 来自 344 次海豚事件的回声定位点击位于涡轮机附近。数据表明，鼠海豚有效地避开了涡轮转子，转子静止时只有一只动物清楚地穿过了转子扫过区域，而在旋转时没有任何动物穿过。
4. 结果表明，潮汐涡轮机与江豚发生碰撞的风险较低；这对潮汐能产业的潜在影响和可持续发展具有重要意义。