En korreksjon til ekkoloddets dybdeangivelse

dc.contributor.author	Midttun, Lars
dc.date.accessioned	2011-04-19T10:29:49Z
dc.date.available	2011-04-19T10:29:49Z
dc.date.issued	1964
dc.identifier.issn	0071-5638
dc.identifier.uri	http://hdl.handle.net/11250/113757
dc.description.abstract	An echo sounder is adjusted for constant sound velocity, usually 1500 m/sec. Since the velocity of sound in the sea is varying with temperature, salinity and depth, a correction is necessary if accurate soundings are required. The present paper shows a practical method for the computation of this correction. 49 of the "G. Sars" stations, taken in the years 1951-55, are fairly well covering the Norwegian Sea (Fig. 3). These stations have been used as basic material for the computation of the depth correction presented in Figs. 4-10. The correction is given as percentage of measured echo depth for the following depths (meters): 500, 1000, 1500, 2000, 2500, 3000, and 3500.	en_US
dc.language.iso	nob	en_US
dc.publisher	Havforskningsinstituttet	en_US
dc.relation.ispartofseries	Fisken og havet;1964 - Nr. 3
dc.subject	echo sounder	en_US
dc.subject	ekkolodd	en_US
dc.title	En korreksjon til ekkoloddets dybdeangivelse	en_US
dc.type	Research report	en_US
dc.subject.nsi	VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924	en_US
dc.source.pagenumber	11 s.	en_US