Abstract Interest in marine renewable energies has grown in recent years, especially in northern European shelf seas where several technological devices have been developed. In this context, numerous investigations focused on accurate predictions of tidal currents and their respective kinetic energy. An empirical estimation of the current velocity is explored in this study, where three different methods are presented. The first method is a linear approximation of the tidal vector velocity as a function of the tidal coefficient (ratio of the tidal range over its maximal value). The second and the third methods are a piece-wise linear and an exponential relationships between tidal vector velocity and the tidal coefficient, respectively. These three methods are compared to reference values obtained using a numerical simulation of tidal hydrodynamics. These methods are applied at two prominent tidal stream energy sites along the coast of France, the Fromveur Strait (western Brittany) and the Alderney Race (between the island of Alderney, Channel islands, and the Cap de la Hague, France). Results show that the piece-wise linear and the exponential models are more accurate than the linear approximation, where the mean error decreased by 12.7% and 14.9% respectively at the worst case scenario.

中文翻译：

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使用简化和快速算法进行潮流速度预测的比较研究

摘要 近年来，人们对海洋可再生能源的兴趣日益浓厚，尤其是在已经开发出多种技术设备的北欧大陆架海域。在这种情况下，许多研究集中在准确预测潮汐流及其各自的动能上。本研究探讨了当前速度的经验估计，其中介绍了三种不同的方法。第一种方法是作为潮汐系数（潮汐范围与其最大值之比）的函数的潮汐矢量速度的线性近似。第二种和第三种方法分别是潮汐矢量速度和潮汐系数之间的分段线性和指数关系。将这三种方法与使用潮汐流体动力学数值模拟获得的参考值进行比较。这些方法应用于法国沿海两个著名的潮汐流能量场，即弗洛弗尔海峡（布列塔尼西部）和奥尔德尼赛马场（奥尔德尼岛、海峡群岛和法国海牙角之间）。结果表明，分段线性和指数模型比线性近似更准确，在最坏情况下，平均误差分别降低了 12.7% 和 14.9%。