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  • Hornsea Project Three Offshore Wind Farm

    Hornsea Project Three

    Offshore Wind Farm

    Environmental Statement: Volume 5, Annex 9.1 - Marine Archaeology Technical Report

    PINS Document Reference: A6.5.9.1 APFP Regulation 5(2)(a)

    Date: May 2018

  • Annex 9.1 – Marine Archaeology Technical Report Environmental Statement May 2018

    i

    Environmental Impact Assessment

    Environmental Statement

    Volume 5

    Annex 9.1 – Marine Archaeology Technical Report

    Report Number: A6.5.9.1

    Version: Final

    Date: May 2018

    This report is also downloadable from the Hornsea Project Three offshore wind farm website at:

    www.hornseaproject3.co.uk

    Ørsted

    5 Howick Place,

    London, SW1P 1WG

    © Orsted Power (UK) Ltd., 2018. All rights reserved

    Front cover picture: Kite surfer near a UK offshore wind farms © Orsted Hornsea Project Three (UK) Ltd., 2018.

    Liability

    This report has been prepared by RPS, with all reasonable skill, care and diligence within the terms of their

    contracts with Orsted Power (UK) Ltd.

    Prepared by: RPS

    Checked by: Jenifer Brack

    Accepted by: Sophie Banham

    Approved by: Sophie Banham

    http://www.hornseaproject3.co.uk/

  • Annex 9.1 – Marine Archaeology Technical Report Environmental Statement May 2018

    ii

    Table of Contents

    1. Introduction .......................................................................................................................................................... 1

    1.1 Project background ...................................................................................................................................... 1

    1.2 Aims and objectives ..................................................................................................................................... 1

    2. Methodology ........................................................................................................................................................ 2

    2.1 Marine archaeology study area ................................................................................................................... 2

    2.2 Relevant legislation and guidance ............................................................................................................... 2

    2.3 Methodology for defining the baseline environment ..................................................................................... 4

    3. Results ................................................................................................................................................................. 8

    3.1 Seafloor topography .................................................................................................................................... 8

    3.2 Submerged prehistoric archaeology .......................................................................................................... 17

    3.3 Maritime archaeology ................................................................................................................................ 24

    3.4 Aviation archaeology ................................................................................................................................. 28

    3.5 Designated, known and recorded wrecks .................................................................................................. 29

    3.6 Hornsea Three geophysical survey ........................................................................................................... 32

    3.7 Hornsea Three intertidal area .................................................................................................................... 36

    4. Conclusions ....................................................................................................................................................... 40

    4.1 Prehistoric archaeological potential ........................................................................................................... 40

    4.2 Maritime and aviation archaeological characterisation and site preservation potential .............................. 40

    5. References ........................................................................................................................................................ 41

    Appendix A UKHO data, derived from SeaZone, within the Hornsea Three Marine Archaeology Study Area ...... 46

    Appendix B Gazetteer of Potential Archaeological Anomalies .............................................................................. 47

    Appendix C Wreck Sheets: High Potential Archaeological Anomalies .................................................................. 62

    Appendix D Information Sheets: Medium Potential Archaeological Anomalies ..................................................... 65

    Appendix E Gazetteer of Magnetic Anomalies ...................................................................................................... 79

    List of Tables

    Table 2.1: Criteria for archaeological potential. ..................................................................................................... 6 Table 3.1: Prehistoric timeline summary.............................................................................................................. 17 Table 3.2: Selected German aircraft losses of Norfolk during the Second World War. ........................................ 29 Table 3.3: Distribution of anomalies by archaeological potential. ........................................................................ 32

    List of Figures

    Figure 2.1: Location of Hornsea Three (the marine archaeology study area), the former Hornsea Zone and the regional marine archaeology study area. .............................................................................................. 3

    Figure 3.1: Hornsea Three geotechnical survey locations and landscape features identified by NSPP and. ....... 10 Figure 3.2: UHRS cross section across Markham’s Hole. .................................................................................... 11 Figure 3.3: UHRS cross section and CPT log at Markham’s Hole. ....................................................................... 12 Figure 3.4: UHRS Section across the southern edge of Outer Silver Pit. ............................................................. 13 Figure 3.5: Overview of part of the offshore cable corridor showing ‘Broad Brush’ geophysical survey results on

    BGS data. ........................................................................................................................................... 14 Figure 3.6: Sample section through channel on Hornsea Three offshore cable corridor. ..................................... 15 Figure 3.7: Sample section through channel on Hornsea Three offshore cable corridor. ..................................... 16 Figure 3.8: Landscape features identified in geophysical survey data from North Seas Palaeolandscapes Project

    (NSPP). .............................................................................................................................................. 21 Figure 3.9: Landscape features identified in NSPP geophysical survey and geotechnical data. .......................... 22 Figure 3.10: The positions of SeaZone and NRHE records within and adjacent to Hornsea Three. ...................... 31 Figure 3.11: The positions of archaeological contacts and magnetic anomalies within Hornsea Three. ................ 33 Figure 3.12: Weybourne Hope shingle ridge beach, with low cliffs in the background. .......................................... 37 Figure 3.13: Eroding cliffs and steep shingle beach at the landfall. ........................................................................ 37 Figure 3.14: Location of the Hornsea Three landfall area walkover and borehole surveys..................................... 39

  • Annex 9.1 – Marine Archaeology Technical Report Environmental Statement May 2018

    iii

    Glossary

    Term Definition

    Acheulian Palaeolithic period stone tools characterised by distinctive oval and pear-shaped hand axes.

    Before Present (BP) An archaeological dating convention– the present assumed in this report to be 1950 (i.e. based on uncalibrated radiocarbon dates).

    Decca System Formerly a positioning system which allowed ships and aircraft to determine their position by receiving radio signals from fixed navigational beacons.

    Ensonify Used in sidescan sonar meaning ‘fill with sound’ – the seabed is flooded with an acoustic source and the intensity of the returning sound waves measured

    Heritage Historic or cultural associations.

    Heritage asset Those elements of the historic environment that hold value to this and future generations because of their historic, archaeological, architectural or artistic interest are called ”heritage assets”. A heritage asset may be any building, monument, site, place, area or landscape, or any combination of these (DECC, 2011).

    Historic England The Historic Buildings and Monuments Commission for England.

    Levallois Palaeollithic stone axe manufacturing technique/type named after 19th century finds of tools in the Parisian suburbs

    Maritime archaeology The physical remains of boats and ships that have bee