Irish National Seabed Survey,
summary progress review concentrates on 2004 activity but if you wish
to access more historical information please click on the appropriate
heading below. Additional progress items are highlighted in the 2004 news
section accessible here.
INSS Coverage to October 2004
INSS entered its fifth year
of data acquisition in March of this year with the arrival of the
Kongsberg Simrad ConCat catamaran into Dublin Bay. Together
with our partners, MI, Imar Survey and Maritech we employed this tiny
nearshore marine survey catamaran as a means to combine data with
the Celtic Voyager. For further information click here.
May 19 the main body of this year's survey commenced with the deployment
of the Marine Institute Vessel, the Celtic Explorer, from Cork towards
Limerick to survey
the approaches into the Shannon
Estuary. Surveying all the way in transit the Explorer then commenced
surveying in the "Unsurveyed" area (as defined by the Admiralty
navigation chart for the area) on the afternoon of the 20th.
Approaches to Shannon
Marine Safety Directorate of the Department of Communications, Marine
and Natural Resources had specifically requested GSI to survey this potentially
dangerous area to fill in the gaps on the navigation chart and perform
a service of potentially vast economic value to the state - the area is
a busy shipping area, but would probably be much busier if charted. Following
consultations with the National Parks Wildlife Service and the Irish Whale
and Dolphin Group, no surveying took place in the Special Area of Conservation
Coverage of area west
of Bantry Bay, Celtic Explorer 2004
her second leg, she returned northwards to continue surveying off
Donegal. Her third leg took her off to the shallow waters of the Rockall
Bank and legs 4 and 5 brought her back towards Donegal and the Irish
Conservation Box west of Bantry Bay.
high-resolution seismic survey west of Rockall and in the Hatton basin
took place in July of this year. Two surveys were involved - 1. Investigating
possible Hydrate deposits wet of Rockall and 2. Investigating the
extent of sedimentary rock in the Hatton area. The survey was done
in conjunction with Petroleum Affairs Division of DCMNR and the Irish
Shelf Petroleum Studies Group, utilizing the Irish Lights vessel the
Grainuaile. The Dublin Institute for Advanced Studies are currently
working this data.
Survey lines arranged
over existing INSS gravity data
1. Seabed classification
map for SouthWest survey
the course of this season's work seabed classification has been undertaken
in real time. This along with sub-bottom data, backscatter and bathymetry
is used to carry out initial groundtruthing in areas being surveyed
(see opposite 1 and 2).
2. Backscatter with Horizon
2 depths plotted (interpreted from Coda)
work on Seabed Classification is breaking new ground and various international
organisations are now seeking to learn from the Irish experience.
To this end a workshop will take place in GSI in January 2005 detailing
our seabed classification system. Details can be accessed here.