Normative methods and numerical modelling in determining the design waves for port hydraulic structures

Introduction. The importance of using composite modelling in the design of wave loads and impacts on port hydraulic structures, namely determining the parameters of design waves, is pointed out. The regulatory documents intended to calculate the permissible values of wave elements for the safe servicing of ships at the berth, some shortcomings are noted, some of which are described in this paper.

Materials and methods. Two objects are used as examples: the Western transport and logistics hub, designed in the Kola Bay of the Barents Sea (where the SWAN wind wave model and the COASTOX-CUR model of currents and water levels were used for numerical modelling, calculations by the analytical method were performed according to SR 38.13330.2018) and the Multifunctional Cargo Area located in the Terpeniya Bay of the Sea of Okhotsk (where calculations were carried out in the SWAN wind wave model and the SWASH long-wave model). For the first case, wave values at control points were used. In the second case, two calculation models were used to determine the influence of the vessel on the wave field — simplified and numerical ones.

Results. For the first example, the differences in the values of waves with and without reflection were analyzed using the analytical method. For the second, the modelling results are presented — the field of significant wave heights for a simplified wall with and without a vessel with a table of control point values. Modelling of a vessel in a mooring pocket is shown through pictures of instantaneous marks of the rough surface and the field of significant heights with the output of control point values. An analysis of the obtained height values in paintings with and without a vessel was performed.

Conclusions. Analysis of two problems showed that the determination of acceptable wave elements at the berth for the safe servicing of ships, carried out in accordance with current regulatory documents, can lead to contradictions, namely the initial data for calculations and a significant change in the wave fields of the port water area when the wave interacts with the moored vessel. As a consequence, this affects the final conclusion about the safe interaction of ships with berth structures.

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