Peterhead Outer Breakwater

In 1998 Peter Fraenkel Maritime Ltd (now NFL), was commissioned by Peterhead Bay Authority to carry out a comprehensive feasibility study into methods of reducing wave and swell activity in Peterhead Bay.
Tags: Coastal Engineering, Ports and Harbours

In 1998 Peter Fraenkel Maritime Ltd (now NFL), was commissioned by Peterhead Bay Authority to carry out a comprehensive feasibility study into methods of reducing wave and swell activity in Peterhead Bay, in order to improve conditions at the many commercial berths around the harbour.  North and south breakwaters protect the Bay but there is a wide entrance, which allows substantial wave energy to enter in easterly gales.

With information on offshore waves for various return periods, the Firm assessed changes in direction and height reduction of these waves at the Bay entrance and analysed the effects of diffraction and reflection as the waves enter the Bay.  The predicted effects were then correlated with records of downtime at the berths.  From this assessment, it was possible to identify improvement options, which were costed and examined in detail for the benefits they could provide at the various berths. 

A staged construction scheme was recommended to the Authority involving major works beyond the existing breakwater structures, with a first stage cost of approximately £20 million. The new outer breakwater would be constructed in water in excess of 20m deep, designed to protect the port against significant waves heights of 11m and to provide all-weather berths up to a 1 in 10 year storm.

Further commissions were awarded in 1999 to carry out a ship manoeuvring simulation study for cruise vessels and tankers.  In 2000-01, physical model testing was carried out at HR Wallingford as specified by and under the supervision of NFL, this being a prelude to final detailed design of the recommended scheme.  An Environmental Impact Assessment of the main construction options was also carried out under the management of NFL.  Detailed design was completed in 2002.  This included further 2D and 3D modelling which was carried out under the firm’s direction at the Danish Hydraulics Institute.







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