Infra-Gravity Waves and Vessel Response
A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312).
Deadline for manuscript submissions: closed (1 December 2015) | Viewed by 25893
Interests: coastal oceanography; mixing and circulation; physical processes; coastal observations; numerical modeling; sediment transport; remote sensing; estuaries; nearshore processes
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Infra-gravity waves (sometimes called long waves), which are defined by the wave period, from 25 to 300 s (or sometimes 600 s), have been reported as one of the causes of oscillation problems in many ports and harbours. In a harbour with lengths of the order of 500 m and depths of the order of 10 m, the natural oscillation periods are of the order of a few minutes and coincide with the infragravity waves with typical periods of 25 to 300 s. When the periods of incident infragravity waves approach the harbour’s natural oscillation period or periods, strong oscillations in the harbour basin can be generated in the infragravity band, through resonance. This results in water level fluctuations and strong horizontal currents within the harbour. In such conditions, if the harbour oscillation periods coincide with natural period of moored vessels, harbour operations can be interrupted due to undesirable vessel movements. This situation further causes damage to mooring lines and fenders, resulting in harbour downtimes followed by significant economic losses.
The main harbour basin at Geraldton Port in Western Australia is frequently impacted by long period waves resulting in excessive ship movements and high mooring loads, including line breakages, and berth unavailability at all seven berths due to long wave surge.
Geraldton Port Authority conducted a symposium aimed at reviewing and assessing Infra-gravity problem with a view to being able to ameliorate the incidence of long waves and/or improve the ability of moored ships to withstand their impact. The Symposium was conducted with invited participants following an international selection process. One requirement of the Technical Papers was for a focus on at least one cost effective solution to Geraldton’s issue within each paper.
This Special Issue is launched to provide a forum for the outcomes of the symposium and a compilation of current state of the art and future perspectives in addressing the long-wave problem in harbours and ports.
Prof. Charitha Pattiaratchi
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- infra-gravity waves
- harbour oscillations
- suspended, bedload and total load
- field observations
- numerical simulation and prediction
- mooring aspects