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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PERCENTAGES . NOTETHAT0 %ABUNDANCE(NOTPRESENT ) SHOULDBECONSIDERED AS0-1 %.SEEIMAGESABOVE. THEREARE<br />
SELDOMNOSPONGESOVERMANYMETRESOFSEABED, THUS0 %ISA MATTEROFSCALEANDTIMING(TOTHEMILLISECOND ) OF<br />
WHENTHEOBSERVATIONWASMADE................................. ................................ ................................ ....................36<br />
FIGURE31.MAPOFOBSERVATIONS OFSPONGEDENSITIESCARRIEDOUTDURINGTHE20<strong>11</strong>BASELINESURVEYANDTHECURRENT<br />
2012DETAILEDVISUALSITESURVEY ................................. ................................ ................................ .....................37<br />
FIGURE32.IMAGESOFTHEMOSTDOMINANTSPONGESPECIES/ GROUPSOBSERVEDATTHEDARWINFIELD. ILLUSTRATION IMAGES<br />
FROMAKVAPLAN-NIVAARCHIVES ................................. ................................ ................................ .........................40<br />
FIGURE33.OBSERVATIONS OFTHEPOTATOSPONGEGEODIAATDARWIN, AUGUST, 2012................................. .....................41<br />
FIGURE34.OBSERVATIONS OFTHEYELLOWSPONGE , APLYSILLA , ATDARWIN, AUGUST2012................................. .................42<br />
FIGURE35.OBSERVATIONS OFTHEGLASS-SPONGEFARREAOCCAATDARWIN, AUGUST, 2012................................. ...............43<br />
FIGURE36.OBSERVATIONS FORTHEBLUESPONGEHYMEDESMA , DARWIN, AUGUST2012................................. ....................44<br />
FIGURE37.OBSERVATIONS OFTRAWLTRACKSATTHEDARWINFIELD, AUGUST, 2012................................ ........................... 45<br />
FIGURE38.UPPER: SPOTTEDWOLFISHRESTINGONTHESEDIMENT , AMONGTHEGLASS-SPONGEFARREAOCCA. LOWER:SAITHE,<br />
ATTRACTEDTOTHELIGHTSOFTHEROV................................ ................................ ................................ ...............46<br />
FIGURE39.UPPER: FISH(SAITHE) ANDPOSSIBLYA CORRODEDMETALFISHINGFLOATWITHSOMEBIOLOGICALGROWTHAND(LOWER)<br />
SPONGESONMUDDYSEDIMENT; GEODIAANDAPLYSILLA IN THEFOREGROUND , ANDFARREAOCCAFARTHERBACK(TOTHE<br />
RIGHT)................................. ................................ ................................ ................................ ............................ 47<br />
FIGURE40.LARGESTONEINFOREGROUND, WITHGROWTHOFWHATAPPEARSTOBEHYDROI DS. IN THEBACKGROUNDMUDDY<br />
SEDIMENTSANDERECTSPONGECOLONIES , FREQUENTED BYFISH................................. ................................ ................48<br />
FIGURE41.ILLUSTRATIONOFDEPOSITIONCASE1: DISCHARGE ATTHEORIGINALSPUDLOCATION. UPPER: OBSERVATIONS AND<br />
(LOWER) INTERPOLATED DISTRIBUTIONOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIALEXTENTOFDEPOSITED<br />
DRILLINGCUTTINGS(ASPROVIDEDBYSINTEF). ................................ ................................ ................................ .......51<br />
FIGURE42.ILLUSTRATIONOFDEPOSITIONCASE2: DISCHARGE FROMBOTHTHEORIGINALSPUDLOCATIONANDFROMRIG. UPPER:<br />
OBSERVA TIONSAND(LOWER) INTERPOLATED DISTRIBUTIONOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIAL<br />
EXTENTOFDEPOSITEDRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF)................................ ................................ . 52<br />
FIGURE43.ILLUSTRATIONOFDEPOSITIONCASE6: DISCHARGE300M NORTHOFTHEORIGINALSPUDLOCATION. UPPER:<br />
OBSERVATIONS AND(LOWER) ESTIMATIONSOFSPONGEABUNDANCES , WITHOVERLAYEDMODELEDSPATIALEXTENTOF<br />
DEPOSITEDRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF)................................ ................................ ...............53<br />
FIGURE44.ILLUSTRATIONOFDEPOSITIONCASE7: DISCHARGE ATTHENEWSPUDLOCATION(UPDATE21.09.2012).UPPER:<br />
OBSERVATIONS AND(LOWER). INTERPOLATED ESTIMATI ONSOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIAL<br />
EXTENTOFDEPOSITEDRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF)................................ ................................ 54<br />
FIGURE45.ILLUSTRATIONOFDEPOSITIONCASE6A: DISCHARGENORTH-EASTOFTHESPUDLOCATION. UPPER: OBSERVATIONS AND<br />
(LOWER) INTERPOLATED ESTIMATIONSOFSPONGEABUNDANCES, WITHOVERLAYEDMODELEDSPATIALEXTENTOFDEPOSITED<br />
DRILLINGMUD/ CUTTINGS(ASPROVIDEDBYSINTEF). ................................ ................................ ............................... 55<br />
TABLE1.DESIGNATEDWAYPOINTSFORTHEPRESENTSURVEY. POSITIONSFROMRENAS................................ ........................10<br />
TABLE2.EXTRACTFROMTABLE8 INKÅLÅSETAL., 2010.COUNTYDISTRIBUTIONOFTHENUMBEROFTHREATENEDANDNEAR<br />
THREATENED SPECIESBASEDONDATAFROMTHERØDLISTEDATABASE , ANDCONCERNSKNOWNCURRENTOCCURRENCES OR<br />
ASSUMEDCURRENTOCCURRENCESBASEDONEARLIEROBSERVATIONS ................................. ................................ .........18<br />
TABLE3.EXTRACTFROMEUROPEANSTANDARDCEN/TC230/WG2/TG7"WATERQUALITY—VISUALSEABEDSURVEYSUSING<br />
REMOTELYOPERATEDANDTOWEDOBSERVATIONGEARFORCOLLECTIONOFENVIRONMENTAL DATA". ............................... 23<br />
TABLE4.LISTOFTHEMOSTFREQUENTLYRECORDEDSPONGESPECIES / GROUPSATTHEDARWINFIELD, AUGUST, 2012.SIMPLIFIED<br />
IDENTIFICATION CHARACTERISTICS AREPROVIDEDTOASSISTNON-SPECIALISTS ................................. ............................... 38<br />
TABLE5.EXTRACTFROMOSPAR2010,LISTINGTHEMAINPRESSURESWHICHMAYAFFECTSPONGEPOPULATIONS......................49<br />
TABLE6.SUMMARYOFENVIRONMENTALCOSTSANDBENEFI TSASSOCIATEDWITHTHETHREEMAINTYPESOFDISCHARGESCENARI OS.<br />
................................ ................................ ................................ ................................ ................................ ......50<br />
TABLE7.COMPARISONOFTHEEXTENTOFIMPACTSTOTHESEAFLOORANDSPONGEASSEMBLAGES , UNDER5 DIFFERENTDISCHARGE<br />
SCENARIOS . NOTECASE7 ISCALCULATED FORTHENEWSPUDLOCATION(UPDATED21.09.2012)WHEREASTHEOTHER<br />
SCENARIOS AREBASEDONTHEORIGINALSPUDLOCATION. ................................ ................................ .......................56<br />
<strong>Detailed</strong> <strong>site</strong> <strong>survey</strong> <strong>at</strong> PL531 Darwin<br />
Akvaplan-niva AS Rapport 6051 - 3