Temat: Hydroacoustics - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Szumy podwodne małej jednostki
Underwater noise in a small vessel
Autorzy:: Dudziak, S.
Powiązania:: https://bibliotekanauki.pl/articles/223113.pdf
Data publikacji:: 2013
Wydawca:: Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:: szumy morza
hydroakustyka
identyfikacja
sea noises
hydroacoustics
identification
Opis:: Artykuł przedstawia wyniki badań in situ przeprowadzone na akwenie Zatoki Gdańskiej w celu pomiaru i analizy szumów generowanych przez jednostkę morską. Otrzymane wyniki są wstępem do opracowania metod opisu dźwięków generowanych przez jednostki, a także fazy ich przejścia względem obiektu pomiarowego.
The paper presents the results of investigations carried out in the Bay of Gdańsk in order to measure and analyze noise generated by a maritime vessel. The results obtained are the initial stage in developing methods for describing sounds generated by vessels, as well as phases of their passage with regard to the object measured.
Źródło:: Zeszyty Naukowe Akademii Marynarki Wojennej; 2013, R. 54 nr 3 (194), 3 (194); 39-51
0860-889X
Pojawia się w:: Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Method of determination of acoustic wave reflection points in geodesic bathymetric surveys
Autorzy:: Makar, A.
Powiązania:: https://bibliotekanauki.pl/articles/320673.pdf
Data publikacji:: 2008
Wydawca:: Polskie Forum Nawigacyjne
Tematy:: hydrografia
batymetria
pomiary hydroakustyczne
hydrography
batymetry
hydroacoustics surveys
Opis:: The target of the study is development of method of precise determination of water region's co-ordinates for various applications. Selected factors, as dynamics of the sounding vessel and environmental factors are taken into consideration. In spite of possibility of application motion sensors available on the market (more expensive than professional single-beam echo-sounders), an alternative method of determining pitching and rolling has been developed - introduced in a model of precise determining of acoustic ray's reflection co-ordinates - for a ray characterized by non-linear trajectory. It is an alternative for accelerometers used in hydrography and magnetometers with floating cores available on the market. Main theses of the study may be presented as the following: - the vertical sound speed in water has an impact not only on accuracy of the depth measurement but also on trajectory of the acoustic ray, resulting in its non-linear propagation, - having positions of two points known (in their specific locations), there is a possibility of determining pitching and rolling with an accuracy comparable with performance of the motion sensors, - application of the elaborated methods for selected factors determining accuracy of the hydrographic surveys shall influence accuracy of created charts, safety of navigation and efficiency in searching under-water objects in a significant way.
Źródło:: Annual of Navigation; 2008, 14; 1-89
1640-8632
Pojawia się w:: Annual of Navigation
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Zastosowanie metod akustycznych i magnetycznych w poszukiwaniu obiektów archeologicznych na przykładzie jeziora Lednica
The use of acoustic and magnetic methods in the search for archaeological objects through the example of Lednica lake
Autorzy:: Pydyn, Andrzej
Hac, Benedykt
Popek, Mateusz
Powiązania:: https://bibliotekanauki.pl/articles/532028.pdf
Data publikacji:: 2019
Wydawca:: Muzeum Pierwszych Piastów na Lednicy
Tematy:: archeologia podwodna
geofizyka
magnetometr
hydroakustyka
profilograf osadów dennych
sonda wielowiązkowa
średniowiecze
most
wyspa Ledniczka
jezioro Lednica
underwater archaeology
geophysics
magnetometer
hydroacoustics
subbotto
profilers
multibeam probe
Middle Ages
a bridge
Ledniczka island
Lednica lake
Opis:: Noninvasive surveys and prospections are a new dynamic trend in contemporary archaeology. They represent a trend of multidisciplinary analyses of cultural heritage. Due to limited access to technology, these methods are still not widely used in underwater archaeology, in particular in inland reservoirs. For this reason a team from the Department of Underwater Archaeology of the Institute of Archaeology at Nicolaus Copernicus University in Toruń in cooperation with the Maritime Institute in Gdańsk, the Museum of the First Piasts at Lednica and the Scientific Association of Polish Archaeologists (Warsaw branch), planned and completed a project Kolebka Piastów — archeologiczne prospekcje podwodne w rejonie jeziora Lednickiego in 2017. The project was financed by the Ministry of Culture and National Heritage under the following programme: Cultural heritage, priority: The protection of archaeological monuments. In the course of the project a multibeam probe, a subbottom profiler and a magnetometer were used to conduct surveys. If the conditions and assumptions of the project allowed, a direct underwater verification was conducted. Due to multibeam sonar it is possible to obtain a reliable spatial picture of a lake bottom in high resolution, e.g. 100 or more measurement points for each m2 of the bottom, which enables one to conduct a detailed overview of a surface of the research area and objects lying on it. This method turned out to be the most effective during verification and resulted in the localization of a new medieval bridge in Lednica lake. Using a subbottom sediment profiler is at the moment the only noninvasive method of searching for non-magnetic objects sunk into the bottom. After applying it on a recognized object, such as the Poznań bridge, and after receiving the positive results, it may be assumed — with high probability — that this technology will succeed in the search for other wooden archaeological structures located in subbottom sediments. Magnetometric measurements are the next technology which was used in the researched reservoir. They are indispensable when noninvasive large scale searches of metal objects with magnetic signatures are conducted e.g. the objects made of iron or steel. In the area of Lednica lake several objects with a magnetic signature were localized. In the course of research in Lednica, three types of noninvasive prospections were applied: hydroacoustics (a multibeam probe), seismology (subbottom sediment profiler) and magnetics (Caesium magnetometer). Each of these methods helps to localize other objects and gives very interesting results; however, only after all three have been used is it possible to obtain a precise picture of the bottom of the lake together with anomalies, which to a large extent can have anthropogenic origins. It seems that the future of underwater archaeology is closely related to the described noninvasive surveys. Unfortunately it will be more difficult to achieve in shallow inland reservoirs than in sea waters, where these technologies have already been introduced for some time now.
Źródło:: Studia Lednickie; 2019, 18; 179-193
0860-7893
2353-7906
Pojawia się w:: Studia Lednickie
Dostawca treści:: Biblioteka Nauki

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