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

Result code in 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>
Alternative codes found
RIV/60076658:12310/11:43882420 RIV/60076658:12510/11:43882420
Result on the web
<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>

Result language
angličtina
Original language name
Validation of current acoustic dead-zone estimation methods in lakes with strongly sloped bottoms
Original language description
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
Czech name
—
Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DA - Hydrology and limnology
OECD FORD branch
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Project
<a href="/en/project/GA206%2F07%2F1392" target="_blank" >GA206/07/1392: Horizontal acoustic surveys and fish behaviour in the open water</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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