Lloyds Register EMEA Key contribution of Oceanographic research
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
Lloyd’s Register EMEA Extended Estuair • Based on Risk analyses • Simulation of ships motions and behaviour as a response to the 10 years 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
- Slides: 13