En korreksjon til ekkoloddets dybdeangivelse
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 co...
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Havforskningsinstituttet
1964
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Online Access: | http://hdl.handle.net/11250/113757 |
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ftimr:oai:imr.brage.unit.no:11250/113757 2023-05-15T17:47:03+02:00 En korreksjon til ekkoloddets dybdeangivelse Midttun, Lars 1964 application/pdf http://hdl.handle.net/11250/113757 nob nob Havforskningsinstituttet Fisken og havet;1964 - Nr. 3 urn:issn:0071-5638 http://hdl.handle.net/11250/113757 11 s. echo sounder ekkolodd VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 Research report 1964 ftimr 2021-09-23T20:14:48Z 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. Report Norwegian Sea Institute for Marine Research: Brage IMR Norwegian Sea |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
Norwegian Bokmål |
topic |
echo sounder ekkolodd VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 |
spellingShingle |
echo sounder ekkolodd VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 Midttun, Lars En korreksjon til ekkoloddets dybdeangivelse |
topic_facet |
echo sounder ekkolodd VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 |
description |
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. |
format |
Report |
author |
Midttun, Lars |
author_facet |
Midttun, Lars |
author_sort |
Midttun, Lars |
title |
En korreksjon til ekkoloddets dybdeangivelse |
title_short |
En korreksjon til ekkoloddets dybdeangivelse |
title_full |
En korreksjon til ekkoloddets dybdeangivelse |
title_fullStr |
En korreksjon til ekkoloddets dybdeangivelse |
title_full_unstemmed |
En korreksjon til ekkoloddets dybdeangivelse |
title_sort |
en korreksjon til ekkoloddets dybdeangivelse |
publisher |
Havforskningsinstituttet |
publishDate |
1964 |
url |
http://hdl.handle.net/11250/113757 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_source |
11 s. |
op_relation |
Fisken og havet;1964 - Nr. 3 urn:issn:0071-5638 http://hdl.handle.net/11250/113757 |
_version_ |
1766151331340353536 |