CW and CHIRP signals bottom backscattering in the PEZ of the Baltic sea

• Autorzy: Klusek Z. , Majewski P. , Dragan A.
• Języki publikacji: EN

Abstrakty

EN

High-frequency bottom backscattering experiments were carried out in the Polish Economy Zone of the Southern Baltic Sea. CW and chirp signals were used to determine scattering reverberation as a function of the incident wave grazing angle and at vertical sounding. The chirp signals covered the frequency range from 40 to 80 kHz whilst the CW signals were selected at 40, 60 and 80 kHz. Acoustic data concerning the angular dependence of the backscattering were taken at the points where appropriate investigations of sediment properties had been earlier made by the Polish Geology Institute. The sediment types include not only acoustically hard fine and coarse sand bottom covered with gravel but also a flat muddy bottom. The results present the backscattering as a function of frequency, signal type and sediments properties. Times of reverberation and other statistical properties of returned signal are also discussed. When possible, due to more complete information on the sediments properties the measured backscattering strength was compared to the models developed by Jackson et al.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2010
• Tom: Vol. 13
• Strony: 135--142
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Klusek Z.

autor

Majewski P.

autor

Dragan A.

• Institute of Oceanology, PAS, Powstańców Warszawy Str. 55, 81-712 Sopot, Poland,

Bibliografia

• [1] APL-UW High-Frequency Ocean Environmental Acoustic Models Handbook, Washington 1994.
• [2] H. Boehme et al., Acoustic backscattering at low grazing angles from the ocean bottom. Part I. Bottom backscattering strength, Journal of Acoustical Society of America, vol.77(3), 962-974, 1985.
• [3] D.R. Jackson, APL-UW Third Report of TTCP Bottom Scattering Measurements: Model Development, 1987.
• [4] D.R. Jackson, D. P. Winebrenner, A. Ishimaru, Application of the composite roughness model to high-frequency bottom backscattering, Journal of Acoustical Society of America, vol.79, 1410-1422, 1986.
• [5] Z. Klusek, A. Śliwiński, J. Tęgowski, Characteristic Properties of Bottom Backscattering in the South Baltic Sea, Proceedings of 2nd European Conference on Underwater Acoustics, 105-110, 1994.
• [6] T. Szczepańska, Sz. Uścinowicz, Chemical Atlas of the Southern Baltic, PIG, Warszawa, 1994
• [7] J. Tęgowski, Acoustical classification of the bottom sediments in the Southern Baltic Sea, vol. 130, Quaternary International, 153-161, 2005.
• [8] R.J. Urick, Principles of underwater sound, McGraw-Hill, New York 1983.
• [9] Sz. Uścinowicz, J. Zachowicz, K. Sokołowski, The potential impact of the sewage discharge through the Gdansk –Wschód sewage-treatment plant collector on the chemical composition of the Gulf of Gdansk sediments, Oceanological Studies, vol. XXIX, 67-82, 2000.