Environmental statement - Flyndre and Cawdor - Maersk Oil

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Flyndre and Cawdor Environmental Statement Section 3 Environmental Baseline The physical conditions of the environment influence the type and distribution of marine life in the area, help set the design parameters for offshore facilities and influence the behaviour of emissions and discharges from offshore facilities. 3.1.1. BATHYMETRY, WATER MASSES, CURRENTS AND TIDES The topography in the vicinity of the Flyndre and Cawdor fields is generally considered to undulate gently with gradients
Flyndre and Cawdor Environmental Statement Section 3 Environmental Baseline Figure 3‐2 A schematic diagram of the general circulation in the North Sea (European Environmental Agency, 2002). Mixing in the water column intensifies with increased tidal current speed. Over most of the North Sea, the strength of the tidal streams is generally less than 0.51 m/s, even at mean spring tide. Tidal currents over the proposed development area are relatively weak being between 0.16 m/s (neep tides) and 0.26 m/s (spring tides) (BODC, 1998). Semi‐diurnal tidal currents are relatively weak in offshore Northern and Central North Sea areas (DTI, 2001). In the area of the development the maximum tidal current speed during mean spring tides is between 0.13 m/s and 0.26 m/s (0.25‐0.5 knots) (BODC, 1998). Surge and wind–driven currents, caused by changes in atmospheric conditions, can be much stronger and are generally more severe during winter. Storm events may also generate near‐bed, wave‐induced currents sufficient to cause sediment mobilisation (DTI, 2001). The maximum 50 year surge current in the region of the development is about 0.6 m/s (BODC, 1998). During storms, the resuspension and vertical dispersion of bottom sediments due to waves and currents affects most of the North Sea. In the area of the proposed development the storm surge elevation with a return period of 50 years is approximately 1.25 – 1.5 m (BODC, 1998). D/4114/2011 3 ‐ 3
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Inspections Reviews Investigation
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Environmental statement - Flyndre and Cawdor - Maersk Oil

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