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ABSTRACT A liquefied natural gas (LNG) terminal has been constructed near Marmara Ereglisi - a coastal town located at the northern coast of the Sea of Marmara in Turkey - to unload imported LNG from Algeria. Regarding the wave related issues in the design of the terminal and offshore operations, a wave climate study - comprising direct wave measurements carried out by a directional type wave buoy during one year period and hindcasting studies based on ten years of hourly wind data recorded at Tekirdag meteorological station - have been performed.
INTRODUCTION A liquefied natural gas (LNG) plant - to receive LNG imported from Algeria- has been constructed near Marmara Ereglisi which is a coastal town located at the northern coast of the Sea of Marmara m Turkey. As a part of the works, an LNG terminal - for tankers between 40.000 - 125.000 m category - and intake and outfall structures - to supply and discharge sea water to be used in the vaporisers - have been designed (Fig. 1). Wave conditions are likely to be critical with regard to LNG vessels moored at berths when the period of waves are within the approximate range of 6 to 12 see. The following significant wave heights are the maxima which can be tolerated by vessels at the berth, whilst continuing to discharge cargo (Table 1) (L.G. Moucehl & Parmers, 1988). If the discharge of cargo is discontinued, the vessel can remain at the berth and be expected to tolerate waves having periods exceeding 6 sec, with significant heights of 1.5 to 2.0 m. Attendant tugs and mooring boats will unlikely be able to manoeuvre to assist the ship when significant wave heights reach 1.5 to 2.0 m.
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