Jökull


Jökull - 01.12.1978, Side 45

Jökull - 01.12.1978, Side 45
KII-AS Fig. 2. Sounding sheet of the study area showing curved survey tracks and broad outlines of bathymetry. Isobaths are sketched at 20, 30, 40 and 50 m depth. The survey tracks were curved in order to facilitate navigation (Raydist). Sounding sheet from the Icelandic Hydrographic survey. Mynd 2. Mælingakort af svæðinu, sem sýnir m. a. mælingalínur sem siglt var með botnsjá og dýptarmæli. A kortið eru skissaðar dýptarlínur fyrir 20, 30, 40 og 50 metra. Sjómælingar Islands. “hraun” areas are characterised by rough topography (Icel. “hraun” means lava field or rough, rocky terrain) and depths of less than ca. 25 m. Minimum depths are about 10 metres. The “hraun” areas of Faxaflói have been rich fishing grounds for centuries and topo- graphic names, like Sydra Hraun and Vestra Hraun are indicative of fishermen’s knowl- edge of the nature of the seabed. The knowl- edge that the flat seabed around the “hraun” areas is of shell sand and gravel led to a study of the feasibility of using these shell beds as a source of lime for the production of Portland Cement (Vestdal', 1949). This shell material is now used by the Iceland State Cement Works for that purpose. The demand for fuller knowledge of the occurrence of carbonates in Faxaflói was one of the reasons for a survey carried out in the southern part of the bay in June 1975. The survey covered an qrea of some 500 km2 and included echo — sounding, side — scanning, sediment sampling and some Boomer profil- ing. This was a cooperative venture of the Icelandic Hydrographic Service and the Marine Research Institute, Reykjavík, and was carried out on board the survey launch TYR. The following report describes the results of the survey. INSTRUMENTS AND METHODS The survey was carried out in three phases. The first consisted of echo-sounding and sidescan sonar surveying on parallel tracks, JÖKULL 28. ÁR %3
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Jökull

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