ABSTRACT

The article presents a study investigating the level of variation in sea state parameters encountered by sailing ships crossing the oceans. The sea state parameters have been obtained from a reanalysis, in this case the ERA5. The study is based on the use of different interpolation schemes to compute parameters in geographical positions off the fixed grid. It is shown that the variation in sea state parameters can be significant. Consequently, in case of sailing ships, covering relatively long distances in a short time (30–60 min), it is recommended to rely on bilinear interpolation rather than nearest neighbour. The variation in the sea state parameters is, in fact, at a level which means that the normal assumption of a stationary seaway in periods up to 3 h likely is violated for ships sailing the typical service speed (15–20+ kt).

摘要

这篇文章介绍了一项研究，调查了航行船只穿越海洋时遇到的海况参数的变化水平。海况参数是从再分析中获得的，在本例中是 ERA5。该研究基于使用不同的插值方案来计算固定网格以外的地理位置参数。结果表明，海况参数的变化可能很大。因此，在帆船的情况下，在较短的时间内（30-60 分钟）覆盖相对较长的距离，建议依靠双线性插值而不是最近邻。事实上，海况参数的变化水平意味着对于以典型服务速度（15-20+ kt）航行的船舶而言，可能违反了长达 3 小时的静止航道的正常假设。