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 |
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