This environmental impact assessment for Kriegers flak ... - Vattenfall

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) Biological surveys Extensive investigations to determine the occurrence of seabed living animals, Þ sh, mammals and ß ora have been made in the area using aircrafts, ships and divers. The occurrence of migrating and resting birds as well as migration routes for bats in the area has been investigates. All of these studies have been supplemented by documentary studies. c) Oceanographic surveys. The IfAÖ has amongst others investigated salt and oxygen contents as well as water temperature. Ice conditions have been studied by Germanische Lloyd and BSH. SMHI has made a worst case scenario estimate of the mixing of salt water between upper and lower layers. An estimate of the cumulative impact of building both the German and Swedish wind farms at Kriegers Flak has also been carried out by SMHI. The hydrographical conditions of the area have been surveyed and summarised by Hydromod. 5.6.2. The construction phase As previously stated, it has not yet been decided which type of foundation that will be used although it is likely that monopiles will be used in shallower (down to 25 metres) and tripods in deeper waters. The foundations will be piled or drilled some 30 metres into the seabed. The aim, as far as possible, is to pile the foundations into the seabed. If this proves impossible, for example DESCRIPTION OF THE WIND FARM 31 due to rocks and other solid ground, the foundations will be drilled into the seabed. In order to determine the right foundation dimension and decide whether to pile or drill, preparatory work will be carried out at each speciÞ c foundation location. This encompasses geophysical surveys, such as using sonar and sidescan sonar, seismic surveys and videotaping, as well as geotechnical surveys such as drilling, sounding, vibration testing and sampling of the seabed layers. Proposals regarding this preparatory work can be found in the SIG report (Attachment 4.3, chapter 6). Drilling at the site will be carried out inside the steel tube casing that constitutes the foundation cylinder. The drill mud is sucked through a hose leading up to the drill ship. Onboard the ship, there are two ways to make use of the mud. Either the contents are fed back into the sea where the currents are strong as is the case at the site. The currents will result in quick spreading of the sediments. The second alternative is to dispose of the mud in a container onboard the ship. The mud will sink to the bottom of the container and the water will thereafter be let back into the sea. The remaining sediment will then be released back through the foundation casing. Thereafter the piling can continue down to the target depth. To get rid of a solid obstacle, directional drilling can be applied from several angles with a smaller drill. The obstacle will be broken up and the piling can be continued. The foundation surface will be treated with biodegradable corrosion protection. The technology for assembling wind turbines is rapidly improving. It will quite soon be likely that turbines will be assembled in their entirety onshore and that large special purpose vessels will carry them to the site. As this is a cost saving and less time consuming technique it will, if possible, be used at Kriegers Flak. If this latter alternative will not be possible at the time of building the wind farm, the assembly process will look as follows: As far as possible, the assembly of the turbines will be carried out onshore. The following four components will then be assembled at the site: • The lower part of the tower
32 DESCRIPTION OF THE WIND FARM • The upper part of the tower • The nacelle • The rotor and the rotor blades The different parts will be transported to the site with special installation vessels that are equipped with cranes. Depending on the weather, the installation of each wind turbine usually takes one to two days. As weather conditions usually are favourable, it will probably take place during the period April to September. The installation is planned to be carried out in two phases during two calendar years. There are four reasons for this. Firstly, one can monitor the environmental consequences during the Þ rst phase to determine if something unexpected has occurred. Secondly, one can make use of the knowledge gained during installation to optimise the construction of the foundations. Thirdly, it will be natural to divide the cable laying into two phases as just over 300 MW can be connected to each of the two transformer stations (read more about this in the report “Elektrisk integrering av Kriegers Flak II I det Sydsvenska elnätet”, attachment 13.1). Finally, only monopiles will be used during the Þ rst phase, resulting in a fairly simple installation process.
Page 1 and 2: This environmental impact assessmen
Page 3 and 4: Sweden Offshore Wind AB Hammarby Fa
Page 5 and 6: CONTENTS 8.3 Comparative discussion
Page 7 and 8: CONTENTS 12.10 Recreation and outdo
Page 9 and 10: 6 PREAMBLE AND READER NOTES 1. Prea
Page 11 and 12: 8 PREAMBLE AND READER NOTES Here, t
Page 13 and 14: 10 SUMMARY 2. Summary Introduction
Page 15 and 16: 12 SUMMARY any protected values or
Page 18 and 19: Background
Page 20 and 21: have less impact on the landscape p
Page 22 and 23: Consultation Report
Page 24 and 25: through Ms. Eva-Lena Olsson and Mr.
Page 26 and 27: Description of the Wind Farm
Page 28 and 29: 5.2. Localisation The designated ar
Page 30 and 31: As examples, the technique behind t
Page 32 and 33: not yet been tested by the wind pow
Page 36 and 37: During the construction phase, the
Page 38 and 39: The wind turbines emit an aerodynam
Page 40 and 41: trical and will therefore not conta
Page 42 and 43: Project economics
Page 44 and 45: Time table
Page 46 and 47: Alternative locations
Page 48 and 49: there are technical and economic li
Page 50 and 51: Miscellaneous An application for th
Page 52 and 53: ased on data measured in 2003. Cond
Page 54 and 55: heritage, meaning that any exploita
Page 56 and 57: mentary seabed is mobile due to ice
Page 58 and 59: Alternative layout/scope
Page 60 and 61: sary. An example that has been stud
Page 62 and 63: The Zero Alternative
Page 64: • The mining of approximately 840
Page 67 and 68: 64 PRESENTATION OF THE AREA 11. Pre
Page 69 and 70: 66 PRESENTATION OF THE AREA 11.1.1
Page 71 and 72: 68 PRESENTATION OF THE AREA varies
Page 73 and 74: 70 PRESENTATION OF THE AREA 1995).
Page 75 and 76: 72 PRESENTATION OF THE AREA cont. f
Page 77 and 78: 74 PRESENTATION OF THE AREA The win
Page 79 and 80: 76 PRESENTATION OF THE AREA Month T
Page 81 and 82: 78 PRESENTATION OF THE AREA Species
Page 83 and 84: 80 PRESENTATION OF THE AREA regular
Page 85 and 86:
82 PRESENTATION OF THE AREA The cod
Page 87 and 88:
84 PRESENTATION OF THE AREA 11.6.3
Page 89 and 90:
86 PRESENTATION OF THE AREA Distrib
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88 PRESENTATION OF THE AREA to acqu
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90 PRESENTATION OF THE AREA Of the
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92 PRESENTATION OF THE AREA Bird sp
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94 PRESENTATION OF THE AREA Night a
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96 PRESENTATION OF THE AREA d) Surv
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98 PRESENTATION OF THE AREA During
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100 PRESENTATION OF THE AREA Indivi
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102 PRESENTATION OF THE AREA tion w
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104 PRESENTATION OF THE AREA In the
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106 PRESENTATION OF THE AREA Since
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108 PRESENTATION OF THE AREA Shippi
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110 PRESENTATION OF THE AREA 11.11.
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112 PRESENTATION OF THE AREA These
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114 PRESENTATION OF THE AREA to pre
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116 CONSEQUENSES OF THE WIND FARM 1
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118 CONSEQUENSES OF THE WIND FARM I
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126 CONSEQUENSES OF THE WIND FARM s
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128 CONSEQUENSES OF THE WIND FARM
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132 CONSEQUENSES OF THE WIND FARM J
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136 CONSEQUENSES OF THE WIND FARM c
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138 CONSEQUENSES OF THE WIND FARM A
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140 CONSEQUENSES OF THE WIND FARM I
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142 CONSEQUENSES OF THE WIND FARM p
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Cumulative effects
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and the track at low visibility is
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13.3 Current conditions/ saltwater
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Control program
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14.2 Fish The wind farm’s possibl
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Collected judgement
Page 164:
15.3.2 The operational phase The fa
Page 167 and 168:
164 CABLE LAYING 16. Cable laying I
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166 CABLE LAYING 16.2 Design The tr
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168 CABLE LAYING There will be rest
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170 BIBLIOGRAPHY 17. Bibliography A
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172 BIBLIOGRAPHY ratoriet, Lysekil.
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174 FTABLE OF ATTACHMENTS 19. Table
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1 Wind farm, view from Trelleborg,
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Wind farm, view from Trelleborg, 30
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Wind farm, view from ships bridge,
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7 Wind farm, view from Møn, 30 km,
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9 Wind farm, view from Rügen, 42 k
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