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Additional navigational widths of inland vessels passing cross current fields

Additional navigational widths of inland vessels passing cross current fields. Bernhard Söhngen, Nicole Maedel, Lucia Hahne, Ismael Verdugo, Jose Iribarren. Introduction. Review of the German Guidelines “Cross currents from discharge and inlet structures in waterways”

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Additional navigational widths of inland vessels passing cross current fields

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  1. Additional navigational widths of inland vessels passing cross current fields Bernhard Söhngen, Nicole Maedel, Lucia Hahne, Ismael Verdugo, Jose Iribarren

  2. Introduction • Review of the German Guidelines “Cross currents from discharge and inlet structures in waterways” • Parameter study to assess the additional navigation width needed in the reach of the structures in a straight channel • Aim: Detection of the main parameters influencing the additional navigational width in order to develop a formula smart rivers 2011 ·Sven Wurms · 14.09.2011

  3. Methods The models distance to bank x • CFD-Model • (13 different current fields) • Real-Time Simulator and • Numerical autopilot model (78 different manoeuvres) • Theoretical consideration width of the inlet/outlet structure w0 additional navigational width b cross current velocity v0,cross semi empirical formula main current vmain smart rivers 2011 ·Sven Wurms · 14.09.2011

  4. Methods Numerical models of the current fields model region and variations smart rivers 2011 ·Sven Wurms · 14.09.2011

  5. Methods Real-Time Simulator and Numerical autopilot model considered parameters: • Type of inland vessel (Europe ship, Large Motor Ship, Push Tow Unit Convoy) • ship draught • ship speed • power of bow thruster • width of the inlet or outlet structure • distance to the to bank • driving direction manoeuvring strategy: keep the vessel at the required distance from the bank using all the manoeuvre means on board. smart rivers 2011 ·Sven Wurms · 14.09.2011

  6. Methods Theoretical consideration Leeway Compensation by drifting smart rivers 2011 ·Sven Wurms · 14.09.2011

  7. Methods Theoretical consideration • Draught factor • Fitting the parameters to the distance of ship path • Consideration main current • and turbulence (only for inlet cross currents) smart rivers 2011 ·Sven Wurms · 14.09.2011

  8. Methods Theoretical consideration Fitting the parameters to the distance of ship path and considering main current and turbulence Draught factor Compensation by drifting leeway smart rivers 2011 ·Sven Wurms · 14.09.2011

  9. Results The “additional width” b is defined as: Difference between the nearest and the furthermost point of the observed ship swept area relative to the bank. smart rivers 2011 ·Sven Wurms · 14.09.2011

  10. Results Comparison Autopilot and Real-time Simulator a possible human factor 3.2 m 1.5 m smart rivers 2011 ·Sven Wurms · 14.09.2011

  11. Results Dependencies of the additional widths inlet structure, Autopilot inlet structure, Real-time Simulator outlet structure, Autopilot additional width [m] cross current velocity v0,cross [m/s] width of inlet/outlet structure w0 [m] smart rivers 2011 ·Sven Wurms · 14.09.2011

  12. Results Dependencies of the additional widths inlet structure, Autopilot inlet structure, Real-time Simulator outlet structure, Autopilot additional width [m] power of bow thruster [kW] velocity of the main current [m/s] smart rivers 2011 ·Sven Wurms · 14.09.2011

  13. Results Comparisons to theoretical considerations 2.3 m semi empirical formula measured additional width [m] smart rivers 2011 ·Sven Wurms · 14.09.2011

  14. Results Comparisons to theoretical considerations semi empirical formula for our american friends measured additional width [m] smart rivers 2011 ·Sven Wurms · 14.09.2011

  15. Thank you for your attention. for further questions do not hesitate: Prof. Dr. Bernhard Söhngen Federal Waterways Engineering and Research Institute Kußmaulstraße 17 76187 Karlsruhe, Germany bernhard.soehngen@baw.de phone: 0049-721-9726-4600 smart rivers 2011 ·Sven Wurms · 14.09.2011

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