Validation of current acoustic dead-zone estimation methods in lakes with strongly sloped bottoms

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F11%3A00370330" target="_blank" >RIV/60077344:_____/11:00370330 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60076658:12310/11:43882420 RIV/60076658:12510/11:43882420

Výsledek na webu

<a href="http://dx.doi.org/10.4319/lom.2011.9.507" target="_blank" >http://dx.doi.org/10.4319/lom.2011.9.507</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4319/lom.2011.9.507" target="_blank" >10.4319/lom.2011.9.507</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Validation of current acoustic dead-zone estimation methods in lakes with strongly sloped bottoms

Popis výsledku v původním jazyce

Inland water bodies contain extremely steep-sloped bottoms compared with those typically occurring during marine vertical surveys. These steep bottom slopes can cause high acoustic dead zones, biasing our estimates of living organisms. The studies so farhave used the assumption that the first contact between the acoustic wavefront and bottom will be at the point where the radial ray from the transducer is normal to the bottom (90°), which we refer to as the normal ray assumption (NRA). Nevertheless, asacoustic energy dramatically decreases laterally due to the beam's pattern, this assumption may not be fulfilled further from the acoustic axis. It is reasonable to believe that the methods assuming the NRA can fail at quite steep slopes. We installed acalibration benthic gillnet of known height at sites with different bottom slopes, ranging from 12° to 50°. The gillnet's float-line served as a good visible marker above the monitored lake bottom and was successfully used for measuring

Název v anglickém jazyce

Validation of current acoustic dead-zone estimation methods in lakes with strongly sloped bottoms

Popis výsledku anglicky

Inland water bodies contain extremely steep-sloped bottoms compared with those typically occurring during marine vertical surveys. These steep bottom slopes can cause high acoustic dead zones, biasing our estimates of living organisms. The studies so farhave used the assumption that the first contact between the acoustic wavefront and bottom will be at the point where the radial ray from the transducer is normal to the bottom (90°), which we refer to as the normal ray assumption (NRA). Nevertheless, asacoustic energy dramatically decreases laterally due to the beam's pattern, this assumption may not be fulfilled further from the acoustic axis. It is reasonable to believe that the methods assuming the NRA can fail at quite steep slopes. We installed acalibration benthic gillnet of known height at sites with different bottom slopes, ranging from 12° to 50°. The gillnet's float-line served as a good visible marker above the monitored lake bottom and was successfully used for measuring

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DA - Hydrologie a limnologie

OECD FORD obor

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Projekt

<a href="/cs/project/GA206%2F07%2F1392" target="_blank" >GA206/07/1392: Horizontální akustické průzkumy a chování ryb ve volné vodě</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2011

Kód důvěrnosti údajů

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

Název periodika

LIMNOLOGY AND OCEANOGRAPHY-METHODS

ISSN

1541-5856

e-ISSN

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Svazek periodika

9

Číslo periodika v rámci svazku

—

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

507-514

Kód UT WoS článku

000300377800010

EID výsledku v databázi Scopus

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