Review of Cabling Techniques and Environmental Effects Applicable

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Review of Cabling Techniques and Environmental Effects Applicable to the Offshore Wind Farm Industry – Technical Report approach to be adopted for cable route planning and avoid the need for reactive or “firefighting” measures to deal with environmental and engineering issues. Once the cable route and burial technique have been selected there are limited measures that can be adopted to reduce sediment disturbance. The precise timing of the works (e.g. over a spring or neap tide) and the speed at which the burial proceeds may have some influence over the sediment disturbance, however, these parameters are largely determined by operational constraints and it will generally not be possible to make significant changes in an attempt to reduce sediment disturbance. 100
5 Potential impacts and mitigation measures 5.1 Introduction This section addresses the potential environmental impacts that could be experienced during cable installation activities, together with possible mitigation measures that can be used to minimise the magnitude and significance of effects. Although the length of the corridor for cable installation impacts can be long, the footprint of impact is narrow, generally restricted to 2-3m width, with certain methods of installation requiring the use of anchors (see Section 3.9.1). The main impact associated with cable installation relates to the disturbance of sediment (Section 4.3) and the subsequent creation of a sediment plume. The disturbance is restricted to the area described above and the generation of a plume and subsequent settlement is localised, with the area affected dependent on geological and hydrodynamic characteristics. Although the scale of effect will be site specific it is important that the impact should be put into context with natural perturbations resulting from storm activity and other activities occurring in the vicinity including fisheries, aggregate extraction, and other sediment plume generating activities. Impacts and mitigation measures are described and discussed for: ● ● ● ● ● ● ● ● ● Subtidal ecology; Intertidal habitats; Natural fish resource; Fisheries; Marine mammals; Ornithology; Shipping and navigation; Seascape and visual character; and Marine and coastal archaeology. Discussion of impacts is divided into two categories: ● ● Potentially significant impacts – which are considered relevant to the installation of cables and could result in significant environmental effects; and where relevant Other impacts – which may be considered to be impacts by stakeholders but, are unlikely to cause significant effects. 101
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REVIEW OF CABLING TECHNIQUES AND EN
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Review of Cabling Techniques and En
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Abbreviations AIS Automatic Identif
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TTS Temporary Threshold Shift TWA T
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3 Cable types and 18 installation t
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Page 82 and 83: 4 Physical change 4.1 Introduction
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Page 142 and 143: 7 Gaps in understanding Research fo
Page 144 and 145: References Introduction Sinden, G.
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Appendix A: Standards and codes of
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Printed in UK on recycled paper. De
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Review of Cabling Techniques and Environmental Effects Applicable

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