A hydro-acoustics approach of accessing macrophyte biomass data | Hidro-akustično pridobivanje podatkov o biomasi makrofitov
2010
Exler, Norbert | Janauer, Georg | Exler, Nobert | Janauer, Georg
anglais. Hydro-acoustic methods are commonly used to estimate the abundance and distribution pattern of fish in aquatic environments, while studies on the assessment of the biomass of submerged macrophytes in the littoral zones are still rare. In the present study we provide first results showing that indeed this method is a useful tool to estimate the aquatic plant stands in lakes. The aim of the recent presentation is to show an initial data evaluation by graphs describing hydro-acoustic signals at three distinct layers in a small shallow lake: the solid sediment, the fine or muddy sediment, and the ‘plant canopy’ of submerse macrophytes. The most difficulties of data processing and assessment of biomass were for hydro-acoustic records close to the water surface where the echo-signal is interfered by reflectance. Methodological details and progress in evaluating hydro-acoustic records will be discussed.
Afficher plus [+] Moins [-]slovène. Hidro-akustične metode se navadno uporabljajo za oceno pogostosti in zastopanosti rib v vodnem okolju, medtem ko so tovrstne raziskave biomase makrofitov v litoralu razmeroma redke. Raziskava podaja rezultate, ki kažejo na uporabnost metode za oceno sestojev makrofitov v jezerih. Namen raziskave je prikazati začetno vrednotenje podatkov hidro-akustičnih signalov na treh različnih plasteh majhnega plitvega jezera: trdnih usedlin, finih oziroma rahlih usedlin in sestojev potopljenih makrofitov. Največja težava pri obdelavi podatkov in oceni biomase so bili signali v bližini vodne površine, ki so interferirali z odbojem. V prispevku je podan metodološki pristop in potek ocenitve hidro-akustičnih signalov.
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