Impact of banks on ship squat
Lataire, E.; Delefortrie, G.; Vantorre, M. (2016). Impact of banks on ship squat, in: Uliczka, K. et al. (Ed.) Proceedings of the 4th International Conference on Ship Manoeuvring in Shallow and Confined Water with Special Focus on Ship Bottom Interaction, Hamburg, Germany, 23 to 25 May 2016 (4th MASHCON). pp. 115-121 In: Uliczka, K. et al. (Ed.) (2016). Proceedings of the 4th International Conference on Ship Manoeuvring in Shallow and Confined Water with Special Focus on Ship Bottom Interaction, Hamburg, Germany, 23 to 25 May 2016 (4th MASHCON). Bundesanstalt für Wasserbau: Karlsruhe. ISBN 978-3-939230-38-0. XVIII, 314 pp., more |
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| Abstract | In a restricted channel the hydrodynamic behaviour of a sailing vessel is affected by both the vertical and horizontal boundaries. The restricted space underneath and alongside a vessel has a noticeable influence on both the running sinkage and trim of a vessel, also known as squat. A different bank geometry will obviously change the available space around the vessel. To assess these influences an extensive model test program has been carried out in the Towing Tank for Manoeuvres in Shallow Water (cooperation Flanders Hydraulics Research – Ghent University) in Antwerp, Belgium. The tests were performed with 11 different ship models (both seagoing as inland vessels) along 25 different bank geometries and cross section areas. Systematic model tests were carried out along vertical quay walls, constant sloped banks (from full depth to free surface) and banks with a submerged sloped part and a horizontal submerged area (semi submerged banks). Also rectangular cross sections with a range of widths and water depths were tested in the towing tank. During the model tests the models were free to heave and trim and the running sinkage was measured at four discrete positions of the ship model (fore-aft / starboard-port side). In this article the executed model tests are described and the impact of different bank geometries on the squat of the vessel is discussed. The change in squat for different slopes of the bank as well as the bank type (quay wall/surface piercing) and cross section areas is shown. |
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