![Overview ,[object Object],[object Object],[object Object],Principal Contractor is Coastline Surveys Limited, a UK based survey contractor and dredging research Consultancy Biological and statistical analysis has been carried out by Marine Ecological Surveys Limited, also based in the UK, specialising in benthic identification, ecological assessments and impact analysis](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Mms csl nabfinal 2002 ld
- 1. Physical Impacts of Marine Aggregate Mining David R. Hitchcock Ph.D., M.R.I.C.S. Integrated Study on the Impact of Marine Aggregates Mining on the Physical and Biological Resources on the Seabed INTERMAR * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * INTERNATIONAL ACTIVITIES AND MARINE MINERALS DIVISION
- 13. Intensive activity, Southern North Sea
- 23. Hamon Grab The Coastline Hamon Grab is type approved by CEFAS for offshore benthic investigations. With a dataset collected with constantly changing equipment it is difficult for comparisons to be made. Use of the standard Hamon Grab, as recommended in 1992 by CEFAS will improve nationwide consistency
- 24. Distribution of suspended sediments
- 26. Multiple plumes
- 27. ADCP Profiling June 2001
- 46. Sidescan Sonar Mosaic Sidescan sonar mosaic of the eastern approaches to the Solent. This encompasses the NAB Area 122/3 shown in RED and the active dredging zones in BLUE and GREEN. Also NAB Tower.
- 47. June 1999 sidescan sonar mosaicing Enlarged portion of the previous mosaic. Clearly shows the NAB Tower, different sediment types in the shipping channel, and the dredge holes formed by anchor dredging. Some of the sample locations are also shown.
- 48. June 2001 sidescan sonar mosaicing The June 2001 sidescan sonar mosaicing clearly shows the increased area of active dredging and the localised test loads and trail dredging operations. There is a small development of ripples to the North West of the site but this is across the tide and probably was present during the baseline study in 1999, surveyed at a coarser resolution.
- 49. June 2001 sidescan sonar mosaicing Despite a finer resolution than the baseline survey in 1999, there is no evidence of sand ripple development upstream or downstream from the dredge site. The topographic lows formed by the dredging are clearly seen on the sidescan, and it has been possible to carefully check the seabed around the dredge hole for signs of any overspilled material.
- 52. Sediment province by multivariate analysis Isle of Wight 1° 05' W 1° 00' W 0° 55' W 50° 40' N Nab Tower 7 8 9 10 11 17 18 20 23 24 25 27 28 34 35 36 37 38 39 40 41 42 43 44 45 46 47 53 54 56 57 58 59 62 63 64 65 68 69 70 71 72 73 75 76 77 78 79 80 81 82 88 89 90 91 92 93 94 95 96 97 98 99 104 106 108 109 113 115 116 117 118 119 120 121 122 123 124 125 126 127 129 6 1 32 49 67 84 85 86 87 131 132 133 140 137 139 134 136 138 135 141 50° 42' N 50° 38' N land sands at low tide depth < 10 metres depth > 10 metres number Hamon grab station 1 nautical mile 142 143 144 146 145 150 151 148 147 149
- 53. June 1999 sonar correlation with sediments
- 55. June 1999 sonar correlation with fauna
- 57. Towed video The camera was originally pointing forward when deployed – but a minor snag with a discarded fishing net or lobster potline tilted the camera backwards – hence the image is upside down Frame grabbing of the video is inefficient – these 20 seconds are 32Mb – but the image shows a rough ground with gravelly sediments in between – the drift is in the middle of the heavily worked area, within the pits themselves. There is no evidence of benthic organism (as would be expected immediately following dredging) although some small fish and a crab are encountered