Search results for: SEABED CHARACTERIZATION

• Seabed characterisation using spectral moments of the echo signal

  Publication

  • J. Tęgowski
  • Z. Łubniewski

  - ACTA ACUSTICA UNITED WITH ACUSTICA - Year 2002

  Zbadano użyteczność zastosowania momentów spektralnych obwiedni echa w rozpoznawaniu i klasyfikacji dna morskiego. Przeprowadzono obliczenia momentów spektralnych dla około 15000 ech od dna zarejestrowanych w rejonie Bałtyku Południowego i potwierdzono tezę, że wartości tych momentów skorelowane są silnie z typem dna i rodzajem osadów.

• MATERIALS CHARACTERIZATION

  Journals

  ISSN: 1044-5803 , eISSN: 1873-4189

• Seafloor characterisation using multibeam data: sonar image properties, seabed surface properties and echo properties

  Publication

  • Z. Łubniewski

  - HYDROACOUSTICS - Year 2011

  In the paper, the approach to seafloor characterisation is presented. The multibeam sonars, besides their well verified and widely used applications like high resolution bathymetry and underwater object detection and imaging, are also the promising tool in seafloor characterization and classification, having several advantages over conventional single beam echosounders. The proposed approach relies on the combined, concurrent use...

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• Seabed classification using multibeam echosounder

  Publication

  • Z. Łubniewski
  • A. Chybicki

  - Year 2008

  The method of seabed identification and classification from multibeam sonar echoes is presented. The proposed approach is based on calculation of a set of parameters of an echo envelope, similarly as in seafloor classification using single beam echosounder. These parameters are extracted for each consecutive beam allowing the estimation of their dependence on the seafloor incident angle. The relation between seabed type and calculated...

• PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION

  Journals

  ISSN: 0934-0866 , eISSN: 1521-4117

• Numerical modeling of wave-seabed-structure interaction.

  Publication

  • L. Bierawski

  - Year 2004

  Praca doktorska przedstawia propozycję nowoczesnego rozwiązania obciążeń hydraulicznych przy uwzględnieniu nieliniowych oddziaływań pomiędzy falą wodną, przepuszczalnym dnem i porowatą konstrukcją morską. Nabrzeże pionowe, falochron podwodny i falochron kompozytowy były obiektem eksperymentów numerycznych, których wyniki były weryfikowane przy użyciu wyników laboratoryjnych (niszczących i nieniszczących). Krótki przegląd bieżącej...

• The Examination of the Upper Layers of the Seabed by the Means of the Acoustic Methods

  Publication

  • E. Kozaczka
  • G. Grelowska
  • W. Szymczak
  • S. Kozaczka

  - ACTA PHYSICA POLONICA A - Year 2011

  Propagation of acoustic waves in the sea, in particular in shallow sea, depends on several factors. The basic of them are source power and frequency of acoustic waves, spatial distribution inhomogeneous medium in which acoustic wave propagates, and distributions of speed of sound and density of seawater. The coastal conditions, which limit water medium from above (free surface of the sea) and from bottom (the seabed), are no less...

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• The Imaging of Gdansk Bay Seabed by Using Side Sonar

  Publication

  • G. Grelowska
  • E. Kozaczka
  • D. Witos-Okrasińska
  • W. Szymczak

  - Polish Maritime Research - Year 2018

  This paper is mainly aimed at presentation of an impact of environmental conditions on imaging accuracy by using hydro-acoustic systems in waters of a high non-uniformity of spatial distribution of hydrological parameters. Impact of refraction on erroneous estimation of range, in case of wave radiation into water under a large angle, like in side sonars or multi-beam echo-sounders, is especially important. In this paper seasonal...

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• Extraction, Optimization, and Characterization of Neem Seed Oil via Box-Behnken Design Approach

  Publication

  • K. BEYECHA
  • D. ABDİSSA
  • A. BEKELE
  • A. B. Bayu

  - Journal of the Turkish Chemical Society Section A: Chemistry - Year 2022

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• Journal of Food Measurement and Characterization

  Journals

  ISSN: 1932-7587