Detailed visual seabed survey at drilling site 7218/11-1

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List of figures and tables FIGURE1.EXPLORATIONWELL7218/11-1 (DARWIN) LOCATIONINTHEBARENTSEA(SOURCE : RENAS) ................................ ...5 FIGURE2.ROVTRANSECTS ANDRECORDSOFSPONGESFOUNDATDARWINDURINGTHEBASELINESURVEYIN2011.THERELATIVE AMOUNTSOFTHEVARIOUSCATEGORIES OFSPONGEDENSITIESARESHOWNINTHEPIECHART. SEDIMENTSAMPLESWERETAKEN ATTHEREDDOTS(AXESCROSSES ).THESPUDLOCATIONISMARKEDWITHA BLUETRIANGLE(SEEARROW).FIGUREFROMDNV (2011)................................. ................................ ................................ ................................ ............................. 6 FIGURE3.MSNJORDVIKING................................. ................................ ................................ ................................ ........8 FIGURE4.MAGNUMROVSYSTEMUNDERDEPLOYMENTFROMNJORDVIKING. THEBLUECYLINDERATTHEBASEOFTHEROVISTHE HDSTILLCAMERA. PHOTOSABINECOCHRANE . ................................ ................................ ................................ .........9 FIGURE5.INSTALLINGHDCAMERAONTHEMAGNUMROV.INCLUDEDTOGIVESCALETOTHEFIGUREABOVE. PHOTOSABINE COCHRANE . ................................ ................................ ................................ ................................ ........................9 FIGURE6.PLANNEDSURVEYROUTEFORDETAILEDSITESURVEYATDARWIN, AUGUST2012................................. ....................11 FIGURE7.OVER4 TONNESOFSPONGES(PRESUMABLY ACCIDENTA LLY) COLLECTED INA TRAWLDURINGA RESEARCH EXPEDITIONTO THETROMSØFLAKET , NORTHERNORWAYIN2007.IMAGE: NORWEGIANRESEARCHINSTITUTE (HTTP:// WWW.IMR.NO/ TOKT/ TOKTOMTALER/ OKOSYSTEMTOKTET /TOKTDAGBOK _2007/DEKKET_FULLT_AV_SVAMP/ NB-NO). ................................ ................................ ................................ ................................ ................................ ......14 FIGURE8.GEODIASPONGEASSEMBL AGEIN THENORTHWESTATLANTIC. IMAGE: NORTHWESTATLANTICFISHERIESORGANISATION ). ................................ ................................ ................................ ................................ ................................ ......14 FIGURE9.GENERALDISTRIBUTIONOFHABITAT-FORMINGSPONGES INTHENEATLANTICANDNORDICSEASASINDICATEDBYRECORDS IN THEOSPAR[…]DATABASE . CONCENTRATION OFSPONGESVARYCONSIDERABL YWITHINTHESEAREAS........................... 15 FIGURE10.BARENTSEA. SPONGEBYCATCHIN RESEARCHBOTTOMTRAWLING1982-97SUPERIMPOSED ONFISHING..................16 FIGURE11.GENERALSTRUCTURE OFA HYPOTHETICAL SPONGE. FIGUREFROMUNIVERSITYOFBERKELEY (HTTP:// WWW.UCMP.BERKELEY .EDU/ PORIFERA / PORIFERAMM .HTML)................................. ................................ ........17 FIGURE12.SCANNINGELECTRONMICROSCOPE (SEM)IMAGEOFSPONGESPICULES. IMAGEFROM HTTP:// WWW.UCMP.BERKELEY .EDU/ PORIFERA / PORSKEL .HTML................................. ................................ .................17 FIGURE13.LEFT: UNIDENTIFIEDSPONGEFROMTHEDEEP-WATERLICENSEBØNNA, HOMETOAPOPULATIONOFGAMMARID CRUSTACEANS ANDRIGHT: AGEODIACOLONY, OFFERINGSUBSTRATE ANDSHELTERFOROTHERORGANISMS . PHOTOLEFT: AKVAPLAN-NIVA/OCEANEERING /ENIRIGHT: ILLUSTRATION PHOTOGRA PH, UNKNOWNLOCATION................................. .....18 FIGURE14.PHOTOSFROMMERCIER(2012)SHOWING(LEFT) A SEA-PENFIELDAND(RIGHT) DEVELOPINGLARVAEOFTHEREDFISH SEBASTESTUCKEDAMONGTHEPOLYPSOFTHESEAPENS . SIZEOFTHESEAPENS ISNOTGIVEN, BUTTHESCALEBARS ONTHERIGHT AREBOTH1 MM. ................................ ................................ ................................ ................................ ...............20 FIGURE15.ABUNDANCESCALEDEFINEDBYDNV,2008.UPPERLEFTRARE, UPPE RIGHT, SCATTERED , LOWERLEFT, REGULARAND LOWERRIGHT, HIGHDENSITY ................................. ................................ ................................ ............................... 21 FIGURE16.IMAGEFROMSALINA, 2010,CLASSIFIED ASHAVINGA HIGHDENSITYOFSPONGES . THEGENERALSEAFLOORPICTUREIS SIMILARALSOFORBOTHDARWINANDJUKSA. ................................ ................................ ................................ .........22 FIGURE17.IMPROVISEDCONCEPTUAL VISUALISATIONOFSPONGECOVERAGE , USEDINJULY, 2012................................ ...........23 FIGURE18.MATHEMATICALLY CALCULATED%COVERSCHEMEADOPTEDBYPALERUDANDHANSENDURINGTHEPRESENTVISUAL SURVEYATDARWIN, AUGUST, 2012................................. ................................ ................................ ....................24 FIGURE19.VISUALREPRESENTATION OFDEPTHSRECORDEDDURINGTHESURVEY , BASEDONTHESURVEYLOG. THEPLANNE DRILLING LOCATIONATDARWINISSHOWNBYA YELLOWSTAR................................. ................................ ................................ 25 FIGURE20.ILLUSTRATIVE IMAGE SHOWINGTYPICALSEDIMENTCONDITIONSATTHEDARWINFIELD, AUGUST, 2012.PHOTOS: OCEANEERINGAS................................ ................................ ................................ ................................ .............26 FIGURE21.OBSERVATIONOFMARINELITTER. PIECEOFSHAPEDMETALOFUNKNOWNORIGIN................................. .................26 FIGURE22.VISUALOBSERVATIONS OFESTIMATEDSPONGEDENSITIES , DARWIN, AUGUST2012................................ ...............28 FIGURE23.MAPILLUSTRATING THEDENSITYESTIMATION(%COVERAGESPONGES ) ONTHESEDIMENTSURFACE. SEEMETHODS SECTIONFORQUANTIFI CATIONMETHOD. BLACKCROSSES INDICATEOBSERVATIONS ; DATAAREINTERPOLATE DBETWEENPOINTS BYTHEKRIGINGMETHODINSURFERPROGRAMME . ................................ ................................ ................................ 29 FIGURE24.LOCATIONOFTHE30IMAGE SELECTED FORFURTHERANALYSIS ................................. ................................ .........30 FIGURE25.PHOTOSFROMSELECTED POSITIONS , ILLUSTRATING THECATEGORY0-1 %COVERAGE . DARWINFIELD, AUGUST2012..31 FIGURE26.PHOTOSFROMSELECTED POSITIONSWITH0-1 %COVERAGEOFSPONGESATDARWINAUGUST2012.THESEIMAGES TAKENEARLYMORNING, WHENFISHBECAMEABUNDANT................................. ................................ .......................... 32 FIGURE27.PHOTOSFROMSELECTED POSITIONS(SEEMAPINFIGUREX) WITH1-5 %COVERAGEOFSPONGESATDARWINAUGUST 2012................................. ................................ ................................ ................................ ............................. 33 FIGURE28.PHOTOSFROMSELECTED POSITIONSWITH1-5 %COVERAGEOFSPONGESATDARWINAUGUST2012.......................34 FIGURE29.PHOTOSFROMSELECTEDPOSITIONSWITH5-10%COVERAGEOFSPONGESATDARWINAUGUST2012.....................35 FIGURE30.VISUALREPRESENTATION OFFREQUENCIES OFSPONGEABUNDANCECLASSESACROSSTHESTUDYAREA. UPPER: HISTOGRAMSHOWINGACTUALNUMBERSOFOBSERVATIONSANDLOWER: PIECHARTEXPRESSING RELATIVEFREQUENCIES AS Akvaplan-niva AS, 9296 Tromsø 2 www.akvaplan.niva.no
PERCENTAGES . NOTETHAT0 %ABUNDANCE(NOTPRESENT ) SHOULDBECONSIDERED AS0-1 %.SEEIMAGESABOVE. THEREARE SELDOMNOSPONGESOVERMANYMETRESOFSEABED, THUS0 %ISA MATTEROFSCALEANDTIMING(TOTHEMILLISECOND ) OF WHENTHEOBSERVATIONWASMADE................................. ................................ ................................ ....................36 FIGURE31.MAPOFOBSERVATIONS OFSPONGEDENSITIESCARRIEDOUTDURINGTHE2011BASELINESURVEYANDTHECURRENT 2012DETAILEDVISUALSITESURVEY ................................. ................................ ................................ .....................37 FIGURE32.IMAGESOFTHEMOSTDOMINANTSPONGESPECIES/ GROUPSOBSERVEDATTHEDARWINFIELD. ILLUSTRATION IMAGES FROMAKVAPLAN-NIVAARCHIVES ................................. ................................ ................................ .........................40 FIGURE33.OBSERVATIONS OFTHEPOTATOSPONGEGEODIAATDARWIN, AUGUST, 2012................................. .....................41 FIGURE34.OBSERVATIONS OFTHEYELLOWSPONGE , APLYSILLA , ATDARWIN, AUGUST2012................................. .................42 FIGURE35.OBSERVATIONS OFTHEGLASS-SPONGEFARREAOCCAATDARWIN, AUGUST, 2012................................. ...............43 FIGURE36.OBSERVATIONS FORTHEBLUESPONGEHYMEDESMA , DARWIN, AUGUST2012................................. ....................44 FIGURE37.OBSERVATIONS OFTRAWLTRACKSATTHEDARWINFIELD, AUGUST, 2012................................ ........................... 45 FIGURE38.UPPER: SPOTTEDWOLFISHRESTINGONTHESEDIMENT , AMONGTHEGLASS-SPONGEFARREAOCCA. LOWER:SAITHE, ATTRACTEDTOTHELIGHTSOFTHEROV................................ ................................ ................................ ...............46 FIGURE39.UPPER: FISH(SAITHE) ANDPOSSIBLYA CORRODEDMETALFISHINGFLOATWITHSOMEBIOLOGICALGROWTHAND(LOWER) SPONGESONMUDDYSEDIMENT; GEODIAANDAPLYSILLA IN THEFOREGROUND , ANDFARREAOCCAFARTHERBACK(TOTHE RIGHT)................................. ................................ ................................ ................................ ............................ 47 FIGURE40.LARGESTONEINFOREGROUND, WITHGROWTHOFWHATAPPEARSTOBEHYDROI DS. IN THEBACKGROUNDMUDDY SEDIMENTSANDERECTSPONGECOLONIES , FREQUENTED BYFISH................................. ................................ ................48 FIGURE41.ILLUSTRATIONOFDEPOSITIONCASE1: DISCHARGE ATTHEORIGINALSPUDLOCATION. UPPER: OBSERVATIONS AND (LOWER) INTERPOLATED DISTRIBUTIONOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIALEXTENTOFDEPOSITED DRILLINGCUTTINGS(ASPROVIDEDBYSINTEF). ................................ ................................ ................................ .......51 FIGURE42.ILLUSTRATIONOFDEPOSITIONCASE2: DISCHARGE FROMBOTHTHEORIGINALSPUDLOCATIONANDFROMRIG. UPPER: OBSERVA TIONSAND(LOWER) INTERPOLATED DISTRIBUTIONOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIAL EXTENTOFDEPOSITEDRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF)................................ ................................ . 52 FIGURE43.ILLUSTRATIONOFDEPOSITIONCASE6: DISCHARGE300M NORTHOFTHEORIGINALSPUDLOCATION. UPPER: OBSERVATIONS AND(LOWER) ESTIMATIONSOFSPONGEABUNDANCES , WITHOVERLAYEDMODELEDSPATIALEXTENTOF DEPOSITEDRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF)................................ ................................ ...............53 FIGURE44.ILLUSTRATIONOFDEPOSITIONCASE7: DISCHARGE ATTHENEWSPUDLOCATION(UPDATE21.09.2012).UPPER: OBSERVATIONS AND(LOWER). INTERPOLATED ESTIMATI ONSOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIAL EXTENTOFDEPOSITEDRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF)................................ ................................ 54 FIGURE45.ILLUSTRATIONOFDEPOSITIONCASE6A: DISCHARGENORTH-EASTOFTHESPUDLOCATION. UPPER: OBSERVATIONS AND (LOWER) INTERPOLATED ESTIMATIONSOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIALEXTENTOFDEPOSITED DRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF). ................................ ................................ ............................... 55 TABLE1.DESIGNATEDWAYPOINTSFORTHEPRESENTSURVEY. POSITIONSFROMRENAS................................ ........................10 TABLE2.EXTRACTFROMTABLE8 INKÅLÅSETAL., 2010.COUNTYDISTRIBUTIONOFTHENUMBEROFTHREATENEDANDNEAR THREATENED SPECIESBASEDONDATAFROMTHERØDLISTEDATABASE , ANDCONCERNSKNOWNCURRENTOCCURRENCES OR ASSUMEDCURRENTOCCURRENCESBASEDONEARLIEROBSERVATIONS ................................. ................................ .........18 TABLE3.EXTRACTFROMEUROPEANSTANDARDCEN/TC230/WG2/TG7"WATERQUALITY—VISUALSEABEDSURVEYSUSING REMOTELYOPERATEDANDTOWEDOBSERVATIONGEARFORCOLLECTIONOFENVIRONMENTAL DATA". ............................... 23 TABLE4.LISTOFTHEMOSTFREQUENTLYRECORDEDSPONGESPECIES / GROUPSATTHEDARWINFIELD, AUGUST, 2012.SIMPLIFIED IDENTIFICATION CHARACTERISTICS AREPROVIDEDTOASSISTNON-SPECIALISTS ................................. ............................... 38 TABLE5.EXTRACTFROMOSPAR2010,LISTINGTHEMAINPRESSURESWHICHMAYAFFECTSPONGEPOPULATIONS......................49 TABLE6.SUMMARYOFENVIRONMENTALCOSTSANDBENEFI TSASSOCIATEDWITHTHETHREEMAINTYPESOFDISCHARGESCENARI OS. ................................ ................................ ................................ ................................ ................................ ......50 TABLE7.COMPARISONOFTHEEXTENTOFIMPACTSTOTHESEAFLOORANDSPONGEASSEMBLAGES , UNDER5 DIFFERENTDISCHARGE SCENARIOS . NOTECASE7 ISCALCULATED FORTHENEWSPUDLOCATION(UPDATED21.09.2012)WHEREASTHEOTHER SCENARIOS AREBASEDONTHEORIGINALSPUDLOCATION. ................................ ................................ .......................56 Detailed site survey at PL531 Darwin Akvaplan-niva AS Rapport 6051 - 3
Page 1 and 2: Detailed visual seabed survey at dr
Page 3: Akvaplan -niva AS Rådgivning og fo
Page 8 and 9: Preface In August,2012,Akvaplan-niv
Page 10 and 11: Figure2. ROVtransectsandrecordsof s
Page 12 and 13: 2 Materials and methods 2.1 Vessel
Page 14 and 15: 2.3 Survey track and waypoints Thep
Page 16 and 17: Akvaplan-niva haspreviouslyworked w
Page 18 and 19: Figure7. Over4 tonnesof sponges(pre
Page 20 and 21: Figure10. BarentsSea.Spongebycatchi
Page 22 and 23: Somespongesform densereefs,and prov
Page 24 and 25: Figure14. Photosfrom Mercier(2012)s
Page 26 and 27: Figure16. Imagefrom Salina,2010,cla
Page 28 and 29: It is clear that Cochraneadopted a
Page 30 and 31: 5.2 Seafloor conditions 5.2.1 Sedim
Page 32 and 33: 5.3.2 Plots of sponge distribution
Page 34 and 35: Figure24. Locationof the 30 imagess
Page 36 and 37: Position16. 0-1 % coverage Position
Page 38 and 39: Position15. 1-5 % coverage.Geodiaan
Page 40 and 41: 5.3.3 Overall assessment of sponge
Page 42 and 43: 5.3.5 Dominant sponge species recor
Page 44 and 45: Hymedesmia Hymedesmia Polymastia Po
Page 46 and 47: Figure34. Observationsof the yellow
Page 48 and 49: Figure36. Observationsfor the blues
Page 50 and 51: Figure38. Upper:spottedwolffishrest
Page 52 and 53: Figure40. Largestonein foreground,w
Page 54 and 55: Table 6. Summaryof environmentalcos
Page 56 and 57:
5.4.2.2 Deposition Case 2: to seafl
Page 58 and 59:
5.4.2.4 Deposition Case 7: Depositi
Page 60 and 61:
5.4.3 Comparative assessment Table7
Page 62 and 63:
6 References Auster, P.J. 2007. Lin
Page 64:
Appendices Anelectronicsupplement(o
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Detailed visual seabed survey at drilling site 7218/11-1

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