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Current conditions in the northern North Sea

机译：北海北部目前的状况

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In order to acquire sufficient simultaneous data to establish joint distributions of waves and currents for design, an extensive measurement programme of simultaneous waves and current profiles has been performed for approximately 5 years at several locations in the northern North Sea. The measured current data have been found to be more inaccurate than the specified accuracy of the instruments. However, the measured current data still give a good over-all description of the main features of the current conditions in the northern North Sea. Variations in current conditions are seen between the different measurement locations. At the southernmost locations, wind driven currents, i.e. inertial oscillations, are the governing current conditions and contribute to larger current speeds during summer than in the spring and fall, both operational and extreme. At all locations, year-to-year variation in estimated extreme current speeds based on different individual years are larger than expected, indicating that current measurements for considerably more than one year is required for reliable estimates of extreme current conditions for design of offshore structures. These results highlight the need for a better understanding of the current conditions in order to account for the uncertainties associated with these in design of offshore structures.
机译：为了获取足够的同时数据以建立波浪和电流的联合分布以进行设计，已经在北海北部的多个位置进行了大约5年的同时波浪和电流剖面的广泛测量程序。已经发现，所测量的电流数据比指定的仪器精度更不准确。但是，实测的当前数据仍然可以很好地全面说明北海北部当前状况的主要特征。在不同的测量位置之间可以看到电流条件的变化。在最南端的位置，风力驱动的电流（即惯性振荡）是控制电流的条件，并且在夏季和秋季（秋季和秋季）比夏季和秋季导致更大的电流速度。在所有地点，基于不同年份的估计极端电流速度的逐年变化都比预期的大，这表明对海上结构设计的极端电流条件进行可靠的估计需要超过一年的电流测量。这些结果强调需要更好地了解当前状况，以解决海上结构设计中与这些状况相关的不确定性。

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