Key contribution of Oceanographic research in providing an economic solution to Zeebrugges lack of h

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Key contribution of Oceanographic research in
providing an economic solution to Zeebrugges
lack of hinterland connectivity

• Paul Moeyaert

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Wave measurement
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Solutions

• Noorderkanaal
• Dockships
• extended estuair regime

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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

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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

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Statistical distribution of occurances of
dangerous situations

• Slamming
• Greenseas
• Rolling
• Bending moment

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Acceptable frequency

• Bending moment once a life time
• Slamming once per year
• Green seas once per life time

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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

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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
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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

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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

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