Print Email Facebook Twitter Bowthrusters and the stability of a riprap revetment Title Bowthrusters and the stability of a riprap revetment Author Verhagen, H.J. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2001-10-01 Abstract Because of problems with the design guidelines produced by PIANC for armoured slopes under attack by bowthrusters, additional work has been done in the Netherlands. On the basis of this work computational rules have been developed. However, because of the increase of bowthruster power, more detailed knowledge is needed on the effect of a bowthruster on the stability of a riprap revetment. Especially large, fast vessels will cause problems to shore protection. Recently P&O put into operation the “Pride of Rotterdam”, a luxury ferry with two bowthrusters with a capacity of 2000 kW each. When the captain uses both thrusters simultaneously, there is a considerable risk of damaging the rock of the underwater slope protection. But also with relatively small vessels for inland navigation problems arise when skippers use their bowthrusters. For the calculation of the effect of a bowthruster at this moment the common methodology is to use the hydraulics of a plain jet. This is not correct because the propeller in the tube causes quite some extra turbulence. This extra turbulence will cause extra damage to the shoreline protection. So in a good design formula for the determination of stability in a bowthrusterflow, he effect of additional turbulence of the propeller has to be included. Subject bowthrusterrevetmentstability To reference this document use: http://resolver.tudelft.nl/uuid:7ff41c0b-e51a-4709-9566-5c914473689a Publisher Bulgarian Ship Hydromechanics Centre Source Proceedings of the 22nd International Conference on Hydrodynamics and Aerodynamics in Marine Engineering, HADMAR 2001, 1-4 October 2001, Varna, Bulgaria Part of collection Institutional Repository Document type conference paper Rights © 2001 TU Delft Files PDF Hadmar2001.pdf 436.17 KB Close viewer /islandora/object/uuid:7ff41c0b-e51a-4709-9566-5c914473689a/datastream/OBJ/view