NDLI: Characteristics of the Infragravity Wave Climate

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Masterton, Stephen Ewans, Kevin
Copyright Year	2008
Abstract	Infragravity waves are very long period waves below the frequency of typical wind waves. They are most significant in shallow water locations and therefore have a high impact on the response of moored vessels. For the Oil and Gas business this can be an important consideration for tanker on/offloading operations (including LNG vessels) — these larger vessels, with longer natural periods, are particularly susceptible. There are implications for both the design and operation including the calculation of extreme loading on the mooring system, extreme vessel motions, fatigue of mooring systems and the availability of on/offloading operations. There are currently limited design practices to account for the effect of infragravity waves. This may be attributed to two main factors: The development of infragravity waves is difficult to model and is sensitive to many factors, including the magnitude and shape of the incident wind and swell spectra, local bathymetry, directionality and near shore wave breaking. Secondly, very little measured data exist since the infragravity wave frequencies lie below the conventional range of commonly deployed wave measurement devices. The present paper will provide a description of the infragravity waves acting on the US coast at two locations, Duck, North Carolina, and Baja, California. The results will characterize parameters including the significant wave height, peak period, and comparison of infragravity waves through time. In addition, the relationships between the spectral shape will be examined including directionality. This type of information is needed to set design criteria for infragravity waves, and in the longer term to develop and enhance infragravity wave models e.g. Reniers 2002 (1) and ultimately contribute to establishing design practices.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	549
Ending Page	556
Page Count	8
File Format	PDF
ISBN	9780791848197
DOI	10.1115/OMAE2008-57648
e-ISBN	0791838218
Volume Number	Volume 2: Structures, Safety and Reliability
Conference Proceedings	ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2008-06-15
Publisher Place	Estoril, Portugal
Access Restriction	Subscribed
Subject Keyword	Water Wind Climate Vessels Mooring Fatigue Liquefied natural gas Engineering design processes Waves Tankers Wind waves Design Shorelines Spectra (spectroscopy) Wave frequency Shapes Duck (textile) Significant wave heights
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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A Method for Deriving Infragravity Wave Design Criteria in Shallow Water

Evaluation of a Model for Estimating Infragravity Waves in Shallow Water: Accuracy and Suitability for Long-Term Climatologies

Multi Vessel Interaction in Shallow Water

Evaluation of Directional Analysis Methods for Low-Frequency Waves to Predict LNGC Motion Response in Nearshore Areas

Methodology for the Design of LNG Terminals in a Nearshore Environment

Shallow Water STL Mooring and Riser System

Second-Order Wave Loads on a LNG Carrier in Multi-Directional Waves

Evaluation of an Extended Operational Boussinesq-Type Wave Model for Calculating Low-Frequency Waves in Intermediate Depths

Calculation of Low-Frequency Waves in Shallow Water and Comparison to Common Practice in Diffraction Methods

Characteristics of the Infragravity Wave Climate

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A Method for Deriving Infragravity Wave Design Criteria in Shallow Water

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Evaluation of Directional Analysis Methods for Low-Frequency Waves to Predict LNGC Motion Response in Nearshore Areas

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