This paper deals with the accessibility for inland shipping to several alternatives for the extension of the Maasvlakte in the Port of Rotterdam (Maasvlakte 2). The accessibility is governed by the risks associated with high wind and wave conditions, which can cause structural damage to the ship, excessive intake of water and high loads in the coupling cables of push-barge units. This paper discusses the computational methods for the following aspects: wave conditions in the port area; risk of failure in several failure modes and total downtime. The use of interviews with the skippers of the inland ships is discussed. A summary of the results of the study is also presented.

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