Analysis of noisy signals on base of differential correlation algorithms

• Autorzy: Pogribny W. , Rozhankivsky I. , Leszczyński T. , Lutowski Z.
• Języki publikacji: EN

Abstrakty

EN

The study was conducted in Lake Lansk (surface area - 1042 ha, maximum depth - 53 m), in which the former dominant was vendace. Commercial catch results from the past decade indicate that there has been a seventy-two-fold decreased in vendace stocks. Hydroacoustic estimates indicate that there are 7.9 million fish in the pelagic zone. Approximately 93% of these inhabit the epilimnion (6.8 thousand fishźha-1), which is 7.6 times larger than that in the hypolimnion. There were 2.5 times fewer fish in a similarly sized southern region of the lake in 2004 than in 2001. Using the numbers, species structure, and individual weight, the biomass of the fish inhabiting the pelagic zone was calculated at 194.7 kgźha-1. The largest share was of vendace at 45.7% (89.0 kgźha-1), followed by roach at 18% (35.0 kgźha-1) and bleak at 13.1% (25.5 kgźha-1). The share of 0+ age group vendace was determined to be 70%. This might explain the decrease in commercial vendace catches caused by poor environmental conditions and overfishing. It also forecasts an improvement in resources of this species in the coming years.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 2005
• Tom: Vol. 8
• Strony: 155--162
• Opis fizyczny: Bibliogr. 3 poz., rys.

Twórcy

autor

Pogribny W.

• Institute of Telecommunications of UTA 7 Kaliski Ave., 85-796 Bydgoszcz, Poland

autor

Rozhankivsky I.

• Institute of Telecommunications of UTA 7 Kaliski Ave., 85-796 Bydgoszcz, Poland

autor

Leszczyński T.

• Institute of Telecommunications of UTA 7 Kaliski Ave., 85-796 Bydgoszcz, Poland

autor

Lutowski Z.

• Institute of Telecommunications of UTA 7 Kaliski Ave., 85-796 Bydgoszcz, Poland

Bibliografia

• [1] J.S.Bendat, A.G.Piersol, Random Data: Analysis and Measurement Procedures, John Willey & Sons, Inc., 540 p., 1986
• [2] В.А. Погрибной, Бортовые системы обработки сигналов, Наукова думка, Киев 1984. (W.Pogribny, On-Board Systems for Signal Processing, Naukova Dumka, Kiev, 216 p., 1984 (in Russian))
• [3] В.Погрібний, І.Рожанківський, З.Джицімський, Кореляційний аналіз коротких часових рядів на основі проріджених різниць, Доповіді Національної Академії Наук України, № 2, стор. 47-51, 1997. W.Pogribny, I.Rozhankivski, Z.Drzycimski, Short Time Series Correlation Analysis on Base of Decimated Differences, Reports of the National Academy of Sciences of Ukraine (in Ukrainian)