Acoustical scattering properties of zooplankton - analysis of diurnal variability

• Autorzy: Szczucka J.
• Konferencja: 17 th Symposium on Hydroacoustics (23-26.05.2000; Jurata; Polska)
• Języki publikacji: EN

Abstrakty

EN

The paper compares scattering properties of different types of fish and zooplankton inhabiting the Baltic Sea. They are modelled as elongated objects - prolate spheroids or bent cylinders. The knowledge of the target strength of various marine organisms is indispensable for their biomass estimation and for analysing the variability spatial and temporal in the aggregative behaviour. The dependence of the mean backscattering strength and the normalised moment of inertia on the depth of the centre of gravity, recorded in diurnally migrating Baltic biological layers, is analysed for two different seasons, for night and day separately. These relationships reflect the different vertical migration patterns typical of various seasons, connected with variable hydrological conditions.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2000
• Tom: Vol. 3
• Strony: 173--176
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Szczucka J.

• Institute of Oceanology, Polish Academy of Sciences ul.Powstańców Warszawy 55,81-712 Sopot, POLAND

Bibliografia

• 1. RH.Love, Resonant acoustic scattering by swimbladder-bearing fish, JASA 64(2), 571- 580 (1978).
• 2. T.K.Stanton, Simple approximate formulas for backscattering of sound by spherical and elongated objects, JASA 86, 4, 1499-1510 (1989).
• 3. J.Szczucka, Z.Klusek, Acoustic observations of scattering plankton layers in the South Baltic Sea, Proceedings of the 3rd European Conference on Underwater Acoustics, Heraklion, Crete, vol.1, 123-128 (1996).
• 4. J.Szczucka, Analysis of diurnal variability of the Baltic sound scattering layers, International Symposium on Hydroacoustics and Ultrasonics, EAA Symposium, Gdańsk-Jurata, 109-114 (1997).
• 5. J.Szczucka, Acoustically measured diurnal vertical migration of fish and zooplankton in the Baltic Sea - seasonal variations, Oceanologia 42( 1), 5-17 (2000).