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MARIN will be present at the following exhibitions. We hope to meet up again soon!


A correction method for shallow-water effects on ship speed trials


OTC May 1-4


Maritime Industry May 23-25


In 2021, the International Towing Tank Conference accepted a new procedure to correct ship speed trial results for the effects of shallow water, the so-called ‘Raven shallow water correction’. This method is also included in the 2022/2023 revision of the ISO15016 ‘Guidelines for the assessment of speed and power performance by analysis of speed trial data’. It thus replaces Lackenby’s formula, which had been used until now.


World Maritime Rescue Congress June, 18-20


The new procedure has been derived from physical modelling and extensive computational work at MARIN. For most validation cases, which mainly result from full-scale trials in several water depths, it


gives a much better estimate of the true water depth effects on the speed achieved.


A report has now been published that collects the main information from several previous papers by the same author; adds new checks and comparisons; and discusses all the validations done and that could be found in the literature. The background, limitations and possible refinements of the method are also reviewed. The new report is freely downloadable from www.marin.nl/publications.


H.C. Raven, ‘A correction method for shallow-water effects on ship speed trials’, Report 98800-1-RD, MARIN, June 2022.


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Questions? Contact Communications@marin.nl


Join the HAWA-III JIP


The HAWAI JIP series (Shallow Water Initiative) focuses on nearshore terminals and their sensitivity to infragravity waves (waves with periods between 25-400 sec). The inclusion of infragravity waves in the terminal design is challenging and practical tools and guidelines will be delivered to cope with this. HAWA-III kicked off in June 2022, and will be executed in the coming 2.5 years.


The first two phases of the JIP (HAWA-I and HAWA-II) provided a better understanding of the effect of infragravity waves on nearshore LNG facilities. This resulted in the development of a methodology to take infragravity waves into account in the design of such a facility in specific nearshore locations.


4 report


In the HAWA-III JIP (2022-2024), we will extend and validate the design methodology of nearshore terminals. We will look into the effect of bathymetry, breakwaters, coastlines and quay walls on the hydrodynamic loads of moored vessels. To do so, we will combine the lessons learnt from numerical methods, dedicated model testing and full-scale measurements.


More than 15 companies have already joined the HAWA-III project, including world leading energy companies, shipyards, classification societies, research institutes and universities. We are still open for extra participants. Interested to join? Visit www.marin.nl/jips/hawaiii or contact Frédérick Jaouën, f.jaouen@marin.nl.


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