Detailed visual seabed survey at drilling site 7218/11-1
Detailed visual seabed survey at drilling site 7218/11-1
Detailed visual seabed survey at drilling site 7218/11-1
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Akvaplan -niva AS<br />
Rådgivning og forskning innen miljø og akvakultur<br />
Org.nr: NO 937 375 158 MVA<br />
Framsenteret<br />
9296 Tromsø<br />
Tlf: 77 75 03 00, Fax: 77 75 03 01<br />
www.akvaplan.niva.no<br />
Report title<br />
<strong>Detailed</strong><strong>visual</strong><strong>seabed</strong><strong>survey</strong><strong>at</strong> <strong>drilling</strong> <strong>site</strong> <strong>7218</strong>/<strong>11</strong>-1, Darwin PL 531 in<br />
the BarentsSea- with specialfocuson spongeassemblages .<br />
Author(s)<br />
SabineCochrane<br />
RunePalerud<br />
JesperHansen<br />
AnnaHelenaFalk<br />
Client<br />
RepsolExplor<strong>at</strong>ionNorwayAS(RENAS)<br />
Akvaplan -niva report no.<br />
6051– 1<br />
D<strong>at</strong>e<br />
25.09.2012<br />
No. of pages<br />
64<br />
Distribution<br />
Restricted<br />
Client’s reference<br />
SigurdHellem<br />
Summary<br />
On commissionto RENASNorway, Akvaplan-niva provided biological assistanceduring ROVsediment<br />
mappingaround the planned<strong>drilling</strong><strong>site</strong> <strong>at</strong> the Darwinprospect(PL531)in the BarentsSea, August2012.<br />
ROVfilming along a transect length of approxim<strong>at</strong>ely27 200 m was carried out, over approxim<strong>at</strong>ely17<br />
hours.Thisreport documentsthe distributionanddensitiesof the spongepopul<strong>at</strong>ionsin the area,together<br />
with other biologicalandsedimentcharacteristics.In general,the seafloorcloseto the planned<strong>drilling</strong> <strong>site</strong><br />
<strong>at</strong> the Darwinprospectcanbe characterizedasmainlycomprisedof mud, with somesc<strong>at</strong>teredstones. The<br />
area is visibly rich in bottom currents, and the visible sea-floor communitiesare domin<strong>at</strong>ed by sponges<br />
suchasGeodia,Aplysilla,Farreaoccaandassoci<strong>at</strong>edorganismssuchassqu<strong>at</strong>lobsters(Munida).<br />
Themain challengesfor spongeassessmentsare outlined, and the approachappliedduring the <strong>survey</strong>is<br />
describedin detail. Further,a summaryof st<strong>at</strong>eof knowledgeregardingspongesandmethodsof assessing<br />
spongeassemblagesisoutlined.<br />
Project manager Quality control ler<br />
SabineCochrane LarsHenrikLarsen<br />
© 2012 Akvaplan -niva AS. This report may only be copied as a whole. Copying of part of this<br />
report (sections of text, illustr<strong>at</strong>ions, tables, conclusions, etc.) and/or reproduction in other<br />
ways, is only permitted with written consent from Akvaplan -niva AS.