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Marine Archaeo-Geophysical Survey of of Amets

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Marine Archaeo-Geophysical Survey of of Amets MARINE ARCHAEO‐GEOPHYSICAL SURVEY OF OF AMETS OFFSHORE BERTHS AND CABLE ROUTE ANNAGH HEAD, BELMULLET, CO. MAYO. Moore Marine Job Number: M12MY02 Author: Eoghan Kieran Licence No. 10R012 Date: August 2012 TABLE OF CONTENTS 1 SCOPE OF WORKS..................................................................................................1 1.1 Introduction...................................................................................................... 1 2 CHARACTERISTICS OF THE PROJECT....................................................................1 2.1 Project Description ........................................................................................... 1 2.2 Wave Energy Test Site Location....................................................................... 2 2.3 Project Components ......................................................................................... 3 2.4 Site Layout/Location details ............................................................................ 5 3 DESCRIPTION OF THE EXISTING ENVIRONMENT.................................................5 3.1 Solid Geology .................................................................................................... 5 3.2 Soil Type............................................................................................................ 5 3.3 Landscape ......................................................................................................... 5 4 ARCHAEO-GEOPHYSICAL SURVEY ........................................................................5 4.1 Side Scan Sonar Survey .................................................................................... 7 4.1.1 System.......................................................................................................... 7 4.1.2 Frequency ..................................................................................................... 8 4.1.3 Range ........................................................................................................... 8 4.1.4 Slant Range Correction ................................................................................... 8 4.1.5 Survey Pattern............................................................................................... 8 4.1.6 Navigation..................................................................................................... 8 4.1.7 Data Acquisition............................................................................................. 9 4.1.8 File Format.................................................................................................... 9 4.1.9 Datum........................................................................................................... 9 4.1.10 Geo-referencing ............................................................................................. 9 4.2 Marine Magnetometer Survey .......................................................................... 9 4.2.1 System.......................................................................................................... 9 4.2.2 Cycling Rate .................................................................................................10 4.2.3 Survey Pattern..............................................................................................10 4.2.4 Navigation....................................................................................................10 4.2.5 Data Acquisition............................................................................................10 4.2.6 File Format...................................................................................................11 4.2.7 Datum..........................................................................................................11 4.2.8 Geo-referencing ............................................................................................11 4.3 Multibeam data................................................................................................11 5 CHARACTERISTICS OF THE PROPOSED DEVELOPMENT .....................................11 5.1 Offshore Berth Locations;................................................................................12 5.2 Submarine electricity cables ...........................................................................12 5.3 Cable lay vessel................................................................................................13 5.4 Cable burial ......................................................................................................14 5.5 Cable route.......................................................................................................14 5.6 Submarine cable landfall .................................................................................15 5.7 Cable transition joint bay ................................................................................15 5.8 Substation ........................................................................................................15 6 ARCHAEOLOGICAL ASSESSMENT OF GEOPHYSICAL DATA .................................16 6.1 Side Scan Sonar ...............................................................................................16 6.1.1 100m water depth offshore test area ..............................................................16 6.1.2 Cable route from 100m water depth offshore test area to 50m water depth offshore test area.......................................................................................................19 6.1.3 50m water depth offshore test area................................................................20 6.1.4 Cable route from 50m water depth offshore test area to extent of offshore survey 22 6.2 Magnetometer..................................................................................................22 6.3 Multibeam bathymetry ....................................................................................23 7 DISCUSSION & RECOMMENDATIONS .................................................................25 7.1 Discussion ........................................................................................................25 7.1.1 The Development Area ..................................................................................25 7.2 Assessment of Potential Impacts....................................................................26 7.3 Recommendations ...........................................................................................26 8 APPENDIX 1. SIDE SCAN SONAR CONTACTS ......................................................27 9 APPENDIX 2. BIBLIOGRAPHY .............................................................................32 TABLE OF TABLES Table 1. Location details........................................................................................................................5 TABLE OF FIGURES Figure 1. Extract from Admiralty Chart 2420 showing berth locations in red and cable route in black (Berth C has been removed).................................................................................................................2 Figure 2. Proposed landing site with cable route in blue .......................................................................3 Figure 3. 2010 Survey Lines ....................................................................................................................6 Figure 4. 2012 Survey lines.....................................................................................................................7 Figure 5. 2010 & 2012 Side Scan Sonar Mosaic of Survey Area ...........................................................16 Figure 6. Results of 2010 Magnetometer Survey .................................................................................23 Figure 7. Results of 2012 Magnetometer Survey .................................................................................23 Figure 8. Multibeam data being reviewed in IVS Fledermaus..............................................................24 Figure 9. Multibeam data of the AMETS site.........................................................................................25 TABLE OF PLATES Plate 1. Klein 3900 Side Scan Sonar......................................................................................................8 Plate 2. Marine Magnetics Sea Spy Magnetometer ............................................................................10 Plate 3. Small anchor associated with ADCP ......................................................................................17 Plate 4. Met Buoy anchor and cable on sandy seafloor and in the water column.............................18 Plate 5. Small rock outcrop on eastern side of Test Area A................................................................18 Plate 6. Gravel patch in western side of Test Area A..........................................................................19 Plate 7. Rocky and sandy seafloor along Test Area A cable route......................................................20 Plate 8. Image of mooring chain at 50m box......................................................................................21 Plate 9. Rocky and sandy seafloor in Test Area B ...............................................................................21 M12MY02 AMETS Geophysical Survey August 2012 1 SCOPE OF WORKS 1.1 Introduction Moore Marine Services Ltd. was commissioned by the Sustainable Energy Authority of Ireland (SEAI), to carry out
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