Integrated approach to assess resonance between basin eigenmodes and moored ship motions with wavelet transform analysis and proposal of operational thresholds

• Type: Article in International Scientific Journal
• Date: 2022-03-01

Authors

Raquel Costas (Author) Other; Andrés Figuero (Author) Other; Enrique Peña (Author) Other; José Sande (Author) Other; Paulo Rosa Santos (Author) FEUP

Journal

Title: Ocean Engineering

Vol. 247 No. 110678

Pages: 1-15

ISSN: 0029-8018

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

ISI Web of Science

Scopus - 0 Citations

Scientific classification

CORDIS: Technological sciences

FOS: Engineering and technology

Other information

Authenticus ID: P-00W-1PP

DOI: 10.1016/j.oceaneng.2022.110678

Abstract (EN): Waves with periods between 25 s and some minutes can amplify the motions of moored ships, which may result in terminal downtimes and compromise safety. The purpose of this work is twofold: (i) studying infragravity waves and their influence on moored ship motions, including the definition of operational thresholds and (ii) developing a novel and integrated approach to identify and assess resonance situations using wavelet transform analysis. The resonant modes of the harbor basin were identified using a numerical model validated with fullscale data. The motions of five similar LPG vessels moored at two adjacent jetties were analyzed, both in the frequency and frequency-time domains. It was concluded that surge is the most important motion at the berth that has greater operational problems. Moreover, the infragravity motion periods vary with the mooring line pretension and are proportional to the ratio of water depth to vessel draft. Three episodes of mooring line breaking were attributed to large infragravity surge oscillations. In addition, operational thresholds for basin-vessel resonance situations were defined based on the port tide gauge data. A significant wave height of 0.075 and 0.010 m for the 30-65 s period band was established for LPGs and oil tankers, respectively.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15