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Simulation study to assess the effect of ship beam on the navigable flow conditions in Paris

Mansuy M., Candries M., Eloot K., Page S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2023

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Vol. 17 No. 1

25--31

EN

Traversing the river Seine in Paris is challenging for inland vessels due to the density and diversity of local traffic that is encountered in a confined environment. The waterway authority, Voies navigables de France (VNF), commissioned a study to assess the relevance of the current regulations when vessels of varying types cross Paris. A first simulation study showed that regulations based on length only may be too restrictive for ships with smaller beams [1]. This paper presents additional simulations executed on a full mission bridge simulator with ships of reduced beam. The main bottlenecks happen at different locations depending on the ship’s beam and ships with smaller beam can sail at higher water levels than the ships considered in the first study. The maximum water levels for which safe passage is possible were determined for each ship. Finally, recommendations have been formulated, which were then discussed with VNF and stakeholders.

2

Nautical access study based on real time bird’s eye view simulations

Mansuy M., Candries M., Eloot K.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2021

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Vol. 15 No. 1

53--61

EN

Real time ship manoeuvring simulations are a valuable source of information in the detailed design phase of nautical studies. The feedback of pilots, which is not available for fast time simulations that are carried out by a computerized autopilot, is an important asset in the evaluation of the feasibility of ship manoeuvres. However, real time simulations are significantly more expensive in that realistic 3D visuals are needed so that the pilot can immerse himself in a sailing environment. Modelling and generating such 3D views is time consuming and requires expensive hardware and special skills. Real time simulations that offer only a 2D bird’s eye view for the execution of manoeuvres by pilots, can sometimes be used as a cheaper and faster alternative. This paper presents a case study that evaluates the nautical access to two harbours and discusses some of the advantages and disadvantages of a real time bird’s eye view setup.

3

Optimization of a ship turning basin using real time simulations – a case study for the Quai des Trois Fontaines (Chooz, France)

Mansuy M., Candries M., Eloot K., Wéry B.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2019

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Vol. 13, no. 2

357--363

EN

The Quai des Trois Fontaines is a berthing area in Chooz, France, which was designed for 80 m long vessels (CEMT Class IV) plying the River Meuse. A turning basin is located in front of the Quai des Trois Fontaines to allow vessels to turn before loading at the quay. Real time simulations on a dedicated inland ship manoeuvring simulator at Flanders Hydraulics Research were carried out with experienced skippers to study how the safety of the turning manoeuvre could be improved and which measures are required for safe manoeuvres with longer vessels, i.e. vessels of 85 and 90 m in length. In the first phase of the study, turning manoeuvres of CEMT Class IV vessels of 80 m, 85 m and 90 m long were studied in the existing environment. The manoeuvres were evaluated based on different safety criteria and on the feedback of the pilots. The real time simulations have shown that the actual design of the turning basin is suitable for the 80 m long vessels in any hydro-meteorological condition. However, the manoeuvres become risky with 85 m long vessels under certain conditions and impossible with longer ships. Although the current can be very strong on the river Meuse, the local width turned out to be the most critical parameter. In the second phase of the study, measures were proposed to allow the safe turning of 85 m and 90 m long vessels. Local widening of the river to 100 m and to 105 m were proposed for 85 m and 90 m long ships respectively. A third proposed measure is to provide a fixed point near the end of the quay, to which the vessels can attach and around which they can then turn.

4

Development of Decision Supporting Tools for Determining Tidal Windows for Deep-drafted Vessels

Eloot K., Vantorre M., Richter J., Verwilligen J.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2010

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Vol. 4, no. 3

323--330

EN

A decision supporting tool named ProToel for determining tidal windows for deep-drafted ves-sels arriving at or departing from the Belgian harbours, based on both deterministic and probabilistic criteria, has been developed. The program is presently being evaluated as a short-term decision tool by the pilots and waterways authorities for optimising the shipping traffic to the coastal harbour of Zeebrugge. The software can also be applied for long-term considerations, as is illustrated in the case of the port of Antwerp. Some re-flections are made considering the extension of the tool to include other factors that may affect the safety of shipping traffic, such as interaction with banks and with other shipping traffic.

5

A methodology for evaluating the controllability of a ship navigating in a restricted channel

Eloot K., Verwilligen J., Vantorre M.

Archives of Civil and Mechanical Engineering

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2007

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Vol. 7, no 3

91-104

EN

A methodology is presented for evaluating the controllability of a ship navigating in a restricted channel by means of a hydrodynamic force analysis. This method is applied to assess the controllability of a container vessel in straight channel reaches and in bends in two practical cases. By comparing different initial conditions and bottom configurations the influence of different ship characteristics (main dimensions, draft, rudder and propeller characteristics), operational parameters (such as speed, propeller commands, and bank clearance), environmental parameters (such as current and tidallevel), and channel characteristics (water depth, bank slope, bend radius) on this controllability can be evaluated. For estimating the components of the force analysis, use is made of results of captive model tests in shallow and restricted waters.

PL

Przedstawiona jest metoda oceny sterowności statku płynącego w kanale, przy pomocy analizy sił hydrodynamicznych. Metoda została zastosowana do oceny sterowności kontenerowca w kanale na odcinku prostym i na zakolu, w dwóch przypadkach o znaczeniu praktycznym. Wpływ różnych charakterystyk statku (wymiarów głównych, zanurzenia, charakterystyk steru i pędnika), parametrów eksploatacyjnych (takich jak prędkość, nastawy śruby i odległość od brzegu kanału), czynników środowiskowych (takich jak prąd wody i pływy), i charakterystyki kanału (głębokość wody, nachylenie brzegu, promień zakola) na sterowność może zostać oceniony przez porównanie różnych warunków początkowych i konfiguracji dna. W celu oszacowania sił hydrodynamicznych potrzebnych do analizy wykorzystano wyniki badań modelowych na uwięzi na wodzie płytkiej i ograniczonej.