The Italian port of Venice has a long tradition in international sea trade and has over the past centuries exploited its strategic geographic position enabling trade between Europe and the East. To maintain the economic growth of the region and expand to new markets, the existing maritime infrastructure needs to be expanded and navigation channels widened and deepened to allow access by larger ships. The unique nature of Venice Lagoon and the old city (which is a UNESCO World Heritage site) means that further industrial expansion and in particular dredging of the navigation channels is constrained by the regulations which are intended to protect the environment of the lagoon and surrounding areas from the potential adverse impact of such activities. To address this and also to maximise opportunities for wider expansion of economic activities and future growth in the region, Venice Port Authority has proposed development of an offshore island port to be located outside the lagoon and cargo to be trans-shipped to inland ports and terminals. This paper outlines the concept for the offshore port with particular focus on the novel approach for
transferring containers between the offshore and inland terminals.
Venice lagoon and its ports
Venice lagoon is located in the north end of the Adriatic Sea and has three main inlets which are used for navigation. (See Figure 1) The Lido inlet, in the north, is mainly used by passenger cruise liners calling at the historic city of Venice. The other two inlets, Malamocco
in the middle and Chioggia in the south, are used mainly for commercial and industrial traffic, serving the main industrial ports inside the lagoon and the inland waterways and canal network. Porto Marghera is the main industrial port of Venice, which is the focus of redevelopment for container and logistics activities. The water depth at the main navigation channel to Porto Marghera is 12m. This is the maximum depth to which the channel can be dredged under the environmental regulations. With increasing draught for commercial shipping this water depth limits the expansion of the port and the container terminals. The likely maximum beam that can call at Porto Marghera is 32.3m limiting the vessel size. Further there are sections in the approach to the terminal where traffic is limited to one-way operation only with vessels forming conveys and designated waiting areas.
Venice Port Authority strategic development plan
With the expected rebalancing of economies and the shift from west to east and to emerging
economies, exchanges with Asian nations are likely to increase across the entire European economy. Most goods travelling between Asia and Europe are expected to continue to enter the Mediterranean through the Suez Canal. Today, most of this traffic crosses the Suez Canal and heads for Gibraltar to reach European markets through the North Sea and Baltic ports. A port in the Upper Adriatic has the potential to offer an alternative and possibly faster and more economical transit route for cargo. However, other Mediterranean ports, Upper Adriatic and Upper Tyrrhenian ports alike may take advantage of this rebalancing of trade.
Venice is ideally located within the Trans European land transport corridor. It is directly on East-West Corridor 5, which links Kiev in Ukrain to Lisbone in Portugal; and it is close to North-South Corridor 1, which links Berlin in Germany to Palermo in southern Italy (see Figure 2). Venice is therefore strategically placed to link to the Eastern markets and facilitate intermodal services across Europe. Furthermore, with the changing nature of the industries
previously located in Venice’s Porto Marghera, more land is becoming available for the development of transport and logistics hubs. Venice Port Authority’s strategic goal is to capitalise on Venice’s location and proposed improvements to hinterland connectivity to make the Port of Venice an alternative Gateway to Europe.
Proposal for an offshore port
For this vision to be realised and to protect the fragile environment of the lagoon and the old city, Venice Port Authority proposed the creation of an island port approximately 15km offshore of the Malamacco inlet in 20m water depth, enabling the berthing of large ocean-going ships. The offshore port is to serve the onshore terminals accessible from within the lagoon and other regional terminals and inland destinations (Figures 3 and 4). The offshore container terminal is proposed to have a capacity of 3.0 million TEU per annum as well as an oil terminal to replace the existing oil import jetties located inside the lagoon and reduce the
environmental impact on the lagoon. Fundamental to the success of the offshore port is the seamless transfer of cargo from the offshore terminal to the various inshore terminals and vice versa, requiring a high degree of planning, reliability and cooperation and therefore a unique, integrated system is required.
Options for linking offshore port to land
Various options to connect the offshore terminal to the mainland were considered. These included fixed links such as a tunnel, bridge or causeway as well as a flexible waterway link.
The analysis concluded that a flexible waterway link from the offshore terminal is likely to be the best option considering key stated customer requirements:
staged investment cost,
various inland terminal destinations of cargoes,
reduced environmental impact
flexibility
operational considerations
To meet the above requirements various waterway transfer mechanisms and terminal layouts were investigated. In the development of the waterway transfer mechanism, particular attention was given to the operators and client’s expectation as these would be fundamental to the ports success.
Expectation of service levels and challenges
Typical key service level expectations of operators and customers that the terminal would need to be able to fulfill include but are not limited to:
No terminal imposed delays to mainline container vessels
No terminal imposed delays on the landside interface
Approximately 15% of cargo should be available for pick up 24hrs after discharge is complete
Drop off times of up to 12-24hrs before departure from mainland must be allowed for a percentage of cargo
The majority of export cargo is likely to be dropped off at the terminal in the period of 7 days to 1 day before expected ship arrival
In addition to these requirements, any proposed system needs to provide the ability to cope with unexpected events and constraints that are outside the operators control such as:
Unreliable estimated time of arrival for mainline or feeder vessels,
Various combinations of vessel size/ container exchange/ discharge only/ load only / optional loading calls
Various specific hold/ slot positions for containers
A variety of receiving and redelivery times
Late planning information
Further challenges lie in the inherent nature of the offshore-onshore container terminal concept. In comparison with conventional terminals there is the need to handle containers multiple times. In addition, effort is required to transfer containers between the offshore and onshore terminals across the open sea and through the restricted lagoon channel. Finally, all the personnel working on the offshore terminal have to travel significant distances over sea to get to their place of work, affecting potential shift patterns in relation to EU working time regulations. All of these factors have time, cost and operational implications for any future operator and need to be optimised as far as possible.
Proposed container handling system
Following detailed feasibility studies, a novel approach for handling of containers and their transfer between offshore and inland terminals was proposed. The proposed container handling system holistically considers the entire transport chain from offshore mainline ves
sels to onshore transport node (rail/ road) and vice versa and comprises of a special
waterway transfer element and a unique terminal container layout to optimise the overall productivity and flexibility of the system.The mainline vessel interface chosen comprises of ship to shore gantry cranes (SSGC) with an outreach of at least 24 containers as these have proven high productivity and reliability. The offshore terminal is expected to utilise automated straddle carriers operating in the backreach of the SSGC to decouple the crane operations from the terminal operations with low manning requirements. This means that small delays in one equipment operations do not result in immediate bunching up of traffic and delays in
another operation, increasing overall productivity. Further, the area between the crane legs is sufficient for all operations where the presence of workers is required enabling full separation of human and automated traffic and increasing safety. An automated or semi-automated bridge crane is proposed to transfer containers to both the buffer stack and barges for the waterway transfer mechanism. Automated bridge cranes have been developed and implemented previously, but have not been used widely due to the relatively expensive overhead structure. However, in this application, the cost of the overhead structure may be compensated by the reduced need for equipment, increased productivity and increased ability to automate.
Figure 5 – Schematic representation of the proposed container terminal handling system
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The buffer stacks are designed to store containers parallel to the quay (i.e. same alignment as the barges) to ensure high barge crane productivity and therefore minimised barge numbers. This also avoids the need to have rotating bridge crane spreaders which would add cost and complication. Further, the bridge crane tracks extend to the barge width over the quay to enable the discharge and loading of barges in a single move directly to the buffer stack location. At the point of load or discharge to/from ship to shore crane, the same bridge crane can perform a single move from buffer stack to transfer area ready for the mini straddle carrier and vice versa (in both single and dual cycling mode). For the waterway transfer it is proposed to use a small number of specially designed lighter (LASH) vessels, in combination with a large number of low cost unpowered dumb barges with container slots (see Figure 6). The lighter vessels are highly manoeuvrable and seaworthy and rapidly with dumb barges using an on-board float-on float-off ballasting system. The dumb barges are specifically designed to suit the dimensions of the bridge crane as well as the lighter vessel. Overall, this novel transfer method reduces the amount of staff required to operate vessels, provides sea worthiness without extensive lashing, enables manoeuvering in the restricted channel and lagoon, provides flexibility of serving other destinations and other barge sizes and increases the turnaround speeds in the loading process.The inshore terminals have similar layout and stack design to the offshore terminal. However, due to increased storage requirements the stacks are longer and a second rotating bridge crane spreader is
proposed to ensure a semi-automated safe loading and unloading of road trucks.
Conclusion
The regulatory and environmental constraints on the development of navigation channels within Venice Lagoon, together with availability of land for development and the unique location of Venice in Northern Adriatic created an opportunity for the development of a new container hub and logistics centre and a potential alternative gateway to Europe. Venice Port Authority’s proposed offshore container terminal incorporated a novel approach to trans-shipment of containers which could provide the opportunity for large oceangoing containerships call at Venice and for the fast and efficient distribution of containers to
inland terminals. Discussion on the economic aspects of the proposed scheme is beyond the scope of this paper but it can be said that detailed studies have been carried out to investigate the scheme’s attractiveness and its economic viability and that interested parties can enquire with Venice Port Authority for more information.
In a box?
The feasibility studies for this project were carried out by Halcrow Group Ltd, with support from Idroesse Infrastruttre and BMT Titron, and in close collaboration with Venice Port Authority. The authors wish to express their thanks to Mr Antonio Revedin, Director of Strategic Planning at Venice Port Authority, and his colleagues for all their support and guidance.