Influence of sea-bottom temperature and depth on swept area estimation from trawl surveys (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• Influence of sea-bottom temperature and depth on swept area estimation from trawl surveys (Articolo in rivista) (literal)

Anno

• 2014-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.3989/scimar.03819.24A (literal)

Alternative label

• Brcic, Jure; Grilli, Federica; Sala, Antonello (2014)
  Influence of sea-bottom temperature and depth on swept area estimation from trawl surveys
  in Scientia marina
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Brcic, Jure; Grilli, Federica; Sala, Antonello (literal)

Pagina inizio

• 135 (literal)

Pagina fine

• 142 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 78 (literal)

Rivista

• Scientia marina (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

• 8 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

• 1 (literal)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• University of Split; Consiglio Nazionale delle Ricerche (CNR) (literal)

Titolo

• Influence of sea-bottom temperature and depth on swept area estimation from trawl surveys (literal)

Abstract

• The methodological approach to data collection and analysis in Mediterranean bottom trawl surveys has changed considerably since their beginnings in the mid-1980s. The introduction of new technologies in surveys greatly improved knowledge on trawl underwater geometry, but also raised a question on the reliability of the data obtained. The most commonly used trawl monitoring systems in the Mediterranean use the constant speed of sound when calculating horizontal distance from one sensor to another. However, the speed of the sound in seawater is not constant because it depends on water temperature, pressure, and salinity. This is known to affect the performance of the horizontally transmitting sonars, and it is reasonable to assume that unless it is properly compensated for, the readings from trawl monitoring systems can be incorrect, resulting in biased swept area estimates, and hence potentially producing bias in abundance estimates. In the knowledge that speed of sound depends on temperature, salinity and pressure, the Del Grosso (1974) equation was used to calculate the compensation coefficient for a series of theoretical depth and temperature data. A simple model is proposed in the current paper for the manual correction of the horizontal net opening and swept area estimates. Temperature and depth data obtained from the MEDATLAS project are used to show seasonal and spatial variation in the near-bottom speed of sound, and the results demonstrate that, unless compensated for properly, the error in the horizontal net spread ranges from -1.5% to 2.9%. (literal)

Prodotto di

• Conoscenza del livello di funzionalità degli ecosistemi marini soggetti ad attività antropiche e a sfruttamento sostenibile delle risorse (TA.P04.007.001) (Modulo)
• Marine science institute (ISMAR) (Istituto)

Autore CNR

• ANTONELLO SALA (Persona)

Insieme di parole chiave

• Parole chiave di "Influence of sea-bottom temperature and depth on swept area estimation from trawl surveys" (Insieme di parole chiave)

Incoming links:

Prodotto

• Marine science institute (ISMAR) (Istituto)
• Conoscenza del livello di funzionalità degli ecosistemi marini soggetti ad attività antropiche e a sfruttamento sostenibile delle risorse (TA.P04.007.001) (Modulo)

Autore CNR di

• http://www.cnr.it/ontology/cnr/individuo/unitaDiPersonaleEsterno/ID5007
• ANTONELLO SALA (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Scientia marina (Rivista)

Insieme di parole chiave di

• Parole chiave di "Influence of sea-bottom temperature and depth on swept area estimation from trawl surveys" (Insieme di parole chiave)