Parameterisation of nonlinear ship-induced 3D wave fields for the hydraulic design of protective structures in maritime waterways (PaNSiWa)

在过去的15年中，在海上航道中观察到的腹股沟和护岸等保护结构的严重破坏数量有所增加。对这些损伤的分析表明，目前这种结构的碎石丘层的设计方法不足以保证对船舶引起的波浪荷载具有足够的稳定性。由于这些方法是针对风致波确定的，它们没有考虑长周期的船波分量。2011年启动了与BAW、HPA、IWW（亚琛工业大学）和LWI（布伦瑞克工业大学）的联合研究项目“海上水道中碎石丘结构设计的船舶诱导长周期载荷”。该项目的重点是为碎石丘结构提供设计标准。LWI进行的分析于2013年8月完成。这些结果使我们能够清楚地识别关于船舶波的分类和参数化的知识差距。该项目清楚地表明，需要对三维非线性船舶波场进行三维分析，这不是上述联合研究项目的一部分。此外，它还提供了广泛的船波数据集和有价值的接触，这对所提出的研究是必不可少的。该项目的主要目标是为船舶诱导的三维波场参数化提供科学知识，以满足海上水道中瓦砾堆结构水力设计的需要，特别关注船舶波的空间和非线性特性。关键的研究问题是(i)用于三维船舶尾流场非线性频域分析的非线性傅里叶变换的数值实现（3D-NLFT）， （ii）用于三维船舶尾流场非线性时频域分析的Hilbert-Huang变换的数值实现（3D-HHT），（iii）使用已实现的分析方法（3D- nlft和3D- hht）与传统FFT对船波数据进行对比分析；（iv）对三维船波场进行参数化，以确定海上航道防护碎石丘结构的相关水力设计参数。

In the last 15 years an increased number of serious damages of protective structures such as groins and revetments have been observed in the maritime waterways. The analyses of these damages have shown that the current design approaches for the rubble mound layers of such structures are not sufficient to ensure sufficient stability against ship-induced wave loads. Since these approaches are determined for wind-induced waves, they do not consider the long-period ship-wave components. A joint research project 'Ship-induced long-period loads for the design of rubble mound structures in maritime waterways' with BAW, HPA, IWW (RWTH Aachen) and LWI (TU Braunschweig) was initiated 2011. The focus of that project was to provide design standards for rubble mound structures. The analyses that have been conducted by LWI were completed in August 2013. The results have allowed us to clearly identify the knowledge gaps with respect to the classification and parameterization of ship waves. The project clearly has shown the need for a 3D analysis of three-dimensional, nonlinear ship wave fields, which was not part of the aforementioned joint research project. Moreover, it provided extensive ship wave data sets and valuable contacts, which are indispensable for the proposed research.The primary objective of the proposed project is to generate the scientific knowledge for the parameterization of ship-induced 3D wave fields as required for the hydraulic design of rubble mound structures in maritime waterways with a special focus on the spatial and nonlinear properties of ship waves. The key research issues are (i) the numerical implementation of a nonlinear Fourier transform for the nonlinear frequency-domain analysis of three-dimensional ship wake fields (3D-NLFT), (ii) the numerical implementation of the Hilbert-Huang transform for the nonlinear time-frequency-domain analysis of three-dimensional ship wake fields (3D-HHT), (iii) a comparative analysis of ship-wave data using the implemented analysis methods (3D-NLFT and 3D-HHT) as well as conventional FFT and (iv) the parameterization of 3D ship wave fields in order to determine the relevant hydraulic design parameters for protective rubble mound structures in maritime waterways.