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75.


76147 is a spread of debris remains immediately adjacent to wreck 76145. The debris field has dimensions of 25.6m length, 4.8m width and height of 0.1m and comprises approximately six hard edged small dark reflector anomalies, only one of which has a shadow present. The largest debris piece is 1.6m length and they all have a rectangular shaped appearance in the sidescan sonar data.


76.


In addition to 76095 there are two debris fields that contain possible ferrous material (76167 and 76123). 76167 is a medium sized debris field with dimensions of 19.7m length, 12.6m width and 0.4m height and is located in the central northern section of East Anglia THREE. The debris appears to be in a rectangular arrangement and look to be partially buried on a rough and uneven area of the seabed. The debris field is composed of a number of hard edged and diffuse dark reflectors with shadows of varying sizes, the largest of which has measurements of 12.5m length, 1.2m width and 0.4m height. A small magnetic anomaly is associated with these remains measuring 9.8nT which suggests that some ferrous material may be present.


77.


76123 is a large expanse of debris remains visible in the multibeam bathymetry data as a large mound feature. The debris field has dimensions of 34.4m length, 11.1m width and 2.4m height. The debris is made up of numerous hard edged and diffuse dark reflector anomalies with shadows in the sidescan sonar data with the largest debris piece measuring 7.2m length and 0.6m width. This is visible in the multibeam bathymetry data as an elongated mound composed of two linked rounded mounds located in an area of sand ripples and has a magnetic amplitude of 24nT indicating ferrous material.


1.2.13 Bright Reflectors 78.


There is a single bright reflector anomaly identified within the East Anglia THREE site (76120). Bright reflectors are identified on the side-scan sonar data and are anomalies of low reflectivity. Bright reflectors indicate areas where little or no acoustic energy is returned to the side-scan sonar towfish and can be characteristic of material that absorbs the acoustic energy such as waterlogged wood. 76120 has dimensions of 7.2m length and 2.5m width. The bright reflector is an irregular shape and slightly curvilinear with a diffuse looking appearance and located on a sandy and somewhat uneven part of the seabed in the central southern area of the site.


1.2.14 Dark Reflectors 79.


There are 72 dark reflectors have been identified within the East Anglia THREE site (see Appendix 17.3), and vary greatly in character and size. The smallest dark reflector anomaly (76156) is located in the central area of East Anglia THREE and has dimensions of 0.5m length, 0.5m width and a height of 0.2m. This very small


Preliminary Environmental Information May 2014 East Anglia THREE Offshore Windfarm Appendix 17.2 Archaeological Review of


Geophysical and Geotechnical Data: Technical Report


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