Nautical studies to investigate the possibilities of two-way traffic in an existing port


As part of a larger Environmental Impact Assessment for realising a dedicated terminal in an existing port, MARIN was asked to conduct nautical studies to establish the possibilities for two-way traffic.


M


ARIN has performed several nautical studies in the port before, including the initial studies for a


new lock and a mooring analysis for a lightering location where bulk carriers are (un-)loaded.


The new terminal consists of several dedicated berths along a channel. Due to the new location of the terminal, the existing lightering location will be shifted towards the east. MARIN conducted an extensive dynamic mooring analysis to derive the limits for the new lightering location in terms of passing speed and distance for inbound and outbound traffic for different sizes of single vessels. Based on the results of the first studies, MARIN recently investigated the possibilities of having two-way traffic in the channel and around the turning basin in front of the new lightering location.


In order to investigate the possibilities of two-way traffic, several nautical studies were combined, resulting in an integral approach. The following steps were undertaken: • Step 1: Desk study, to derive the possibilities of two-way traffic for different sizes and types of vessels based on guidelines.


Martin van der Wel m.v.d.wel@marin.nl


14 report


• Step 2: Dynamic mooring analysis, to find out whether or not the limits of the


mooring lines of the moored vessel at the lightering location are exceeded due to the passing two-way traffic. Hence, the limiting passing speed and distances for several combinations of an inbound and outbound vessel, and moored vessel were determined.


• Step 3: Fast-time manoeuvring simulations, in which the vessels were steered by an auto-pilot, to verify the physical limitations.


• Step 4: Real-time manoeuvring simulations, in which the vessels were steered by pilots, were carried out to verify the practical limiting conditions.


In Step 1 the available space for two-way traffic, including different moored vessels, was derived. This was done considering the earlier manoeuvres conducted during the studies for the new lock. The available space was compared with the expected manoeuvring widths for two-way traffic for five different inbound and outbound vessels. The outcome of the desk study found that there is sufficient space to conduct an encounter manoeuvre in front of the lightering location for two different classes of ships - a Panamax bulk carrier and a car carrier. The results were discussed with local pilots, hereby confirming passing distances and speeds with respect to the moored vessel.


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