Ship squat for researchers, masters and pilots
Barrass, C.B. (2009). Ship squat for researchers, masters and pilots, in: Eloot, K. et al. (Ed.) International Conference on Ship Manoeuvring in Shallow and Confined Water: Bank Effects. pp. 39-55 In: Eloot, K.; Vantorre, M. (Ed.) (2009). International Conference on Ship Manoeuvring in Shallow and Confined Water: Bank Effects. Flanders Hydraulics Research/Ghent University/The Royal Institution of Naval Architects: London. ISBN 978-1-905040-46-9. IX, 152 pp., more |
| Available in | Author | | Document type: Conference paper
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| Abstract | This presentation is to help prevent ships going aground because of squat. It represents 37 years of my research into ship squat. My Paper will give Conference Delegates an awareness of the dangers of squat in shallow waters.
As new ship designs have become either bigger or faster, squat problems have increased. I have a portfolio of 106 ships that have grounded due to (in part or wholly) ship squat. In July 2008, an Iron Ore Carrier went aground in an Australian Port. The Port became blocked for 12 hours.
Components of squat are covered, together with worked examples. Container ships, RO-RO vessels, Passenger Liners and Supertankers are considered. Widths of influence are tabulated. Static ukc and dynamical ukc are discussed. Ship squat against ship speed curves are graphically displayed. Vessels with static trim are covered.
Squats at the both ends of a vessel are evaluated. Negative squats are discussed and analysed for vessels having very low and very high block coefficients. A worked example shows how to predict squat in a Navigation Channel with a trench incorporated at its base.
My final Summary highlights for Maritime Personnel and Nautical students five main benefits of being able to predict ship squat. |
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