Lloyd’s Register EMEA Key contribution of Oceanographic research in providing an economic solution to Zeebrugge’s lack of hinterland connectivity Paul Moeyaert
Lloyd’s Register EMEA Wave measurement
Lloyd’s Register EMEA Solutions: Noorderkanaal Dockships “extended” estuair regime
Lloyd’s Register EMEA Access to the network of inland waterways from Zeebrugge: Traditional inlandwater tankers Provided “good’ weather Coasters But too high requirements And high investment/operational costs Due to lack of reliable knowledge of the risk-level
Lloyd’s Register EMEA
Extended Estuair Based on Risk analyses Simulation of ships motions and behaviour as a response to the 10years wave spectra: in the particular sea area
Lloyd’s Register EMEA Statistical distribution of occurances of dangerous situations Slamming Greenseas Rolling Bending moment
Lloyd’s Register EMEA Acceptable frequency Bending moment : once a life time Slamming: once per year Green seas : once per life time
Lloyd’s Register EMEA Iterative process of design If the number of incidents proves to be too high : 2 possible actions: Restrict the allowable weather conditions And/or Increase strength Optimum solution
Lloyd’s Register EMEA Relative vertical motion of point : fore, keel exceeding draft fore: number of exceedings per trajectory as a function of significant wave height in measured directional wave spectra Bol van Heist, Western Scheldt – Zeebrugge
Lloyd’s Register EMEA Significant Wave Height Is a far more accurate criterion for reflecting the risks compared to the old yardstick : Beaufort Number As basis for designing ships But also as a criterium for the captain: whether to make the voyage or the wait for better circumstances
Lloyd’s Register EMEA Further possible improvements Accuracy of predictions on medium term Directional predictions Distinction between: Swell –Caused by remote storms –Long waves, traveling at known speed –well predictable Local waves –Same predictability like the local wind –Shortcrested waves
Lloyd’s Register EMEA