On the re-creation of site-specific directional wave conditions
On the re-creation of site-specific directional wave conditions
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关于特定地点定向波条件的重建
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Draycott
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作者：
S. Draycott
波浪水槽试验有助于了解复杂的海况如何影响人造结构的动力学。如果已知潜在的部署位置，则可以使用现场数据来提高测试条件的相关性和真实性，从而帮助降低器械开发的风险。一般来说，这些数据很难获得，即使可以获得，由于既定的实践和测试设施的限制，也被简单地使用。在这项工作中，来自欧洲海洋能源中心的四年浮标数据在FloWave海洋能源研究设施进行了表征和模拟;这是一个圆形的波流组合试验池。特别强调的是放置在表征和验证过程中，旨在保持光谱和方向的复杂性的网站，同时证明，定义的代表性条件可以有效地创建。在创建代表性的特定站点的海况时，特别关注聚类算法的应用，这使得整个频谱（频率或方向）的形式被认为是在表征过程中。这使得在数据简化过程中能够考虑网站的真正复杂性。在生成和测量所产生的海况之前，探索了缩放问题，对设施本身进行了表征，并强调了开发用于验证方向谱的测量策略。波浪计阵列被设计并用于测量FloWave水槽的各种元素，包括反射、时空变化和波浪形状。还开发了一种新的方向谱重建方法（SPAIR），可以更有效地测量和验证所产生的方向性海况。通过与其他表征方法的比较，固有的方法引起的权衡被理解，并发现，没有绝对有利的方法，需要一个应用程序的特定程序。尽管如此，一组有用的“通用”海况的模拟生产和极端条件。对于海况测量，SPAIR方法被证明比目前的方法更有效，减少了误差并引入了额外的能力。该方法与定向测波仪阵列结合使用，以有效地测量、校正和验证所产生的定向波条件。它还表明，现场特定的波流场景可以有效地重新创建，从而表明，真正复杂的海洋条件可以在FloWave模拟。这种能力，沿着所使用的考虑的表征方法，意味着可以有信心地模拟具有代表性的现场特定海况，从而增加测试环境的真实性并帮助降低设备开发的风险。
Wave tank tests facilitate the understanding of how complex sea conditions influence the dynamics of man-made structures. If a potential deployment location is known, site data can be used to improve the relevance and realism of the test conditions, thus helping de-risk device development. Generally this data is difficult to obtain and even if available is used simplistically due to established practices and limitations of test facilities. In this work four years of buoy data from the European Marine Energy Centre is characterised and simulated at the FloWave Ocean Energy Research Facility; a circular combined wave-current test tank. Particular emphasis is placed on the characterisation and validation processes, aiming to preserve spectral and directional complexity of the site, whilst proving that the defined representative conditions can be effectively created. When creating representative site-specific sea states, particular focus is given to the application of clustering algorithms, which enable the entire spectral (frequency or directional) form to be considered in the characterisation process. This enables the true complex nature of the site to be considered in the data reduction process. Prior to generating and measuring the resulting sea states, issues with scaling are explored, the facility itself is characterised, and emphasis is placed on developing measurement strategies for the validation of directional spectra. Wave gauge arrays are designed and used to characterise various elements of the FloWave tank, including reflections, spatio-temporal variability and wave shape. A new method for directional spectrum reconstruction (SPAIR) is also developed, enabling more effective measurement and validation of the resulting directional sea states. Through comparison with other characterisation methods, inherent method-induced trade-offs are understood, and it is found that there is no absolute favourable approach, necessitating an application specific procedure. Despite this, a useful set of ‘generic’ sea states are created for the simulation of both production and extreme conditions. For sea state measurement, the SPAIR method is proven to be significantly more effective than current approaches, reducing errors and introducing additional capability. This method is used in combination with a directional wave gauge array to effectively measure, correct, and validate the resulting directional wave conditions. It is also demonstrated that site-specific wave-current scenarios can be effectively re-created, thus demonstrating that truly complex ocean conditions can be simulated at FloWave. This ability, along with the considered characterisation approach used, means that representative site-specific sea states can be simulated with confidence, increasing the realism of the test environment and helping de-risk device development.