Title: Key contribution of Oceanographic research in providing an economic solution to Zeebrugge
1Key contribution of Oceanographic research in
providing an economic solution to Zeebrugges
lack of hinterland connectivity
2Wave measurement
3Solutions
- Noorderkanaal
- Dockships
- extended estuair regime
4Access 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
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6Extended Estuair
- Based on Risk analyses
- Simulation of ships motions and behaviour as a
response to the 10years wave spectra in the
particular sea area
7Statistical distribution of occurances of
dangerous situations
- Slamming
- Greenseas
- Rolling
- Bending moment
8Acceptable frequency
- Bending moment once a life time
- Slamming once per year
- Green seas once per life time
9Iterative 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
10Relative 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
11Significant 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
12Further 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
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