Data
Table 17.4 Data Sources Features Year
Geotechnical Data
2010 (27th July – 23rd August)
Coverage
30 boreholes within the East Anglia Zone, two of which are in the East Anglia THREE site
Confidence
Due to limited coverage of the site, confidence in geotechnical data is regarded with mediumconfidence. The assessment was based on the interpreted logs rather than the boreholes themselves which has reduced the certainty of this confidence. The use of this data is therefore limited as there are only two boreholes within East Anglia THREE.
Geophysical anomalies in East Anglia THREE identified through the archaeological assessment of geophysical data
2012 (19th June – 4th September)
Sidescan Sonar and Magnetometer: All data for the East Anglia THREE site and offshore cable corridor assessed.
Multibeam Bathymetry: All wreck locations and sea bed features of potential archaeological interest identified in sidescan sonar and magnetometer data in the East Anglia THREE site and offshore cable corridor.
Sub-bottom profiler: data assessed on every 5th line of data giving 20% coverage of the East Anglia THREE site and offshore cable corridor.
Confidence is considered to variable, as expressed by the assigned data quality. Data quality for archaeological assessment is as follows:
Sidescan Sonar: ‘Good’ Magnetometer: ‘Variable’ Multibeam Bathymetry: ‘Good’ Sub-bottom profiler: ‘Average’
Notes
Geotechnical data supplements the archaeological assessment of sub-bottom profiler data within East Anglia THREE. Boreholes EA 10/G/002 and EA 10/G/030 are located within East Anglia THREE. No geotechnical data has been archaeologically assessed for the offshore cable corridor at this stage of enquiry.
Magnetometer classified as ‘varied’ as data were affected by geological composition of the site. Sub- bottom profiler data classified as ‘average’ as a degree of swell was identified on a number of lines which could not be completely removed, although it did not detrimentally affect the data to a great degree.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 17 Offshore Archaeology Page 21
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125