Limitations of target detection in horizontal acoustic surveys of extremely shallow water bodies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F19%3A00510131" target="_blank" >RIV/60077344:_____/19:00510131 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/19:43899247 RIV/60076658:12520/19:43899247

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0165783619301201?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0165783619301201?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fishres.2019.05.005" target="_blank" >10.1016/j.fishres.2019.05.005</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Limitations of target detection in horizontal acoustic surveys of extremely shallow water bodies

Popis výsledku v původním jazyce

The effect of target strength oscillations, generated by surface or bottom-induced sound multi-pathing, can cause serious errors in estimates of fish biomass in horizontal acoustic surveys of extremely shallow inland waters (depth 1.7-2 m). In this study, the oscillations were shown to occur in both windy and calm weather conditions, and depended on the target's depth and range from a transducer. In calm weather the oscillations were more pronounced and targets that were located close to the water surface and further from the transducer were most affected. Errors in target strength reached up to an 8 dB difference from the theoretical value. Fish abundance and size structure estimates are likely to be affected even more than biomass estimates. To avoid boundary-induced errors in target strength, simulations of fish biomass surveys demonstrated that the data-processing range should be limited to 10 m from the transducer for surveys conducted in extremely shallow waters.

Název v anglickém jazyce

Limitations of target detection in horizontal acoustic surveys of extremely shallow water bodies

Popis výsledku anglicky

The effect of target strength oscillations, generated by surface or bottom-induced sound multi-pathing, can cause serious errors in estimates of fish biomass in horizontal acoustic surveys of extremely shallow inland waters (depth 1.7-2 m). In this study, the oscillations were shown to occur in both windy and calm weather conditions, and depended on the target's depth and range from a transducer. In calm weather the oscillations were more pronounced and targets that were located close to the water surface and further from the transducer were most affected. Errors in target strength reached up to an 8 dB difference from the theoretical value. Fish abundance and size structure estimates are likely to be affected even more than biomass estimates. To avoid boundary-induced errors in target strength, simulations of fish biomass surveys demonstrated that the data-processing range should be limited to 10 m from the transducer for surveys conducted in extremely shallow waters.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

40103 - Fishery

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Fisheries Research

ISSN

0165-7836

e-ISSN

—

Svazek periodika

218

Číslo periodika v rámci svazku

OCT

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

94-104

Kód UT WoS článku

000477786600010

EID výsledku v databázi Scopus

2-s2.0-85065659214