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    Wyświetlanie 1-4 z 4
    Tytuł:
    Current State of Deep Ocean Bathymetric Exploration
    Autorzy:
    Zwolak, K.
    Felski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/320506.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    bathymetry
    ocean
    multibeam echosounder
    AUV
    ASV
    satellite altimetry
    bathymetric map compilation
    Opis:
    The paper presents current state of bathymetric survey concerning deep ocean rather than shallow areas, which are better surveyed due to safety of navigation concerns. Rules and requirements of the new challenge, called the Shell Ocean Discovery XPRIZE, became a starting point for a discussion about the possibilities of mapping large areas of the ocean using up-to-date and new technology. The amount of bathymetric data available nowadays and the current state of ocean map compilations are also discussed in the paper as a motivation to inspire the new initiatives in the deep ocean.
    W artykule przedstawiono obecny stan pomiarów batymetrycznych głębokowodnych obszarów oceanicznych. Zasady najnowszego konkursu Shell Ocean Discovery XPRIZE stały się punktem wyjścia do dyskusji o obecnych możliwościach pozyskiwania danych niezbędnych do tworzenia map oceanów w oparciu o aktualnie dostępne technologie. W artykule poruszono również zagadnienie ilości i cech danych batymetrycznych znajdujących się i udostępnianych w bazach danych gromadzących tego typu informacje.
    Źródło:
    Annual of Navigation; 2017, 24; 257-267
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detekcja obiektów szczególnie niebezpiecznych dla środowiska na dnie morza z wykorzystaniem zobrazowań satelitarnych i lotniczego skaningu batymetrycznego
    Detection of Sea Bed Objects Extremely Dangerous for Environment Based on Satellite Imagery and Airborne Laser Bathymetry
    Autorzy:
    Kogut, T.
    Oberski, T.
    Kogut, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818620.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    batymetria laserowa
    Morze Bałtyckie
    batymetria satelitarna
    ALB
    wykrywanie obiektów
    Airborne Laser Bathymetry
    Baltic Sea
    satellite bathymetry
    objects detection
    Opis:
    Underwater storage of chemical substances placed on the bottom of the Baltic Sea are a major threat to the environment and the health and life of humans. Today, not all locations of the underwater storage sites are known and worsening of their condition and the tides make a periodic monitoring of the seabed is one of the most important tasks of hydrographic authorities to guarantee the marine environment protection and the safe navigation of vessels whose collision can cause an ecological disaster. The sea bed measurements have been carried out by ship-based echo sounding, but this method is rather expensive. The goal of this paper is to examine the possibility of detection of seabed objects based on satellite imagery and airborne laser bathymetry. The first part of the publication presents the principle of bathymetric data acquisition using bathymetric laser scanner and satellite imagery processing to bathymetric data. The second part of this paper presents an analyses the ALB (Airborne Laser Bathymetry) data and bathymetric data from processed satellite imagery. A comparison to echo sounding data shows only small differences in the depths values of ALB data, more than 95% is between ± 0.5 m, but big differences in the depths values of satellite data. The results of tests to object detection are similar to difference comparison. In data from airborne laser bathymetry is possible to find the object on the sea bed, but in satellite bathymetry data it's very difficult or even impossible to detect some object. This paper presents the data and results from the project 'Investigation on the use of airborne laser bathymetry in hydrographic surveying', carried out by the German Federal Maritime and Hydrographic Agency (BSH) in cooperation with the Institute of Photogrammetry and GeoInformation, Leibniz Universität Hannover, Germany.
    Źródło:
    Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 2; 858-868
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mapping South Baltic near-shore bathymetry using sentinel-2 observations
    Autorzy:
    Chybicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/259485.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    near-shorel satellite
    derived
    bathymetry
    Sentinel
    multispectra
    observation
    Opis:
    One of the most promising new applications of remote observation satellite systems (RO) is the near-shore bathymetry estimation based on spaceborn multispectral imageries. In recent years, many experiments aiming to estimate bathymetry in optically shallow water with the use of remote optical observations have been presented. In this paper, optimal models of satellite derived bathymetry (SDB) for relatively turbid waters of the South Baltic Sea were presented. The obtained results were analysed in terms of depth error estimation, spatial distribution, and overall quality. The models were calibrated based on sounding (in-situ) data obtained by a single-beam echo sounder, which was retrieved from the Maritime Office in Gdynia, Poland. The remote observations for this study were delivered by the recently deployed European Space Agency Sentinel-2 satellite observation system. A detailed analysis of the obtained results has shown that the tested methods can be successfully applied for the South Baltic region at depths of 12-18 meters. However, significant limitations were observed. The performed experiments have revealed that the error of model calibration, expressed in meters (RMSE), equals up to 10-20% of the real depth and is, generally, case dependent. To overcome this drawback, a novel indicator of determining the maximal SDB depth was proposed. What is important, the proposed SDB quality indicator is derived only on the basis of remotely registered data and therefore can be applied operationally.
    Źródło:
    Polish Maritime Research; 2017, 3; 15-25
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kelvin-Helmholtz instabilities in the Colorado River Delta, Gulf of California
    Autorzy:
    Carbajal, N.
    Vargas, J.T.
    Rodriguez, J.H.G.
    Montano Ley, Y.
    Salas de Leon, D.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078904.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Kelvin-Helmholtz instability
    Colorado River Delta
    tidal current
    bottom sediment
    bathymetry
    suspended sediment
    satellite image
    Opis:
    In the Colorado River Delta, the interaction of tidal currents and sea-bottom sediment formed, in geological times, large-scale seabed patterns known as sandbanks. These patterns are oriented along the delta, almost parallel to the dominant tidal flow, with the bathymetry having an undulating character across the delta. Calculations and analysis showed that the interaction of tidal currents with the bathymetry causes velocity shears, faster flowing over the ridges than in the troughs. Kelvin-Helmholtz instabilities emerge from the velocity shear, and a large amount of suspended sediment makes the instabilities visible in satellite images. The physical and dynamic conditions allowed us to find an explanation for the existence of these Kelvin-Helmholtz instabilities. Since sandbanks have been observed in different seas such as the North Sea, The Gulf of Korea, the Gulf of Khambhat in India, the Jiangsu coast in China, the Persian Gulf, and Moreton Bay in Australia, the results suggest the existence of instabilities in these areas. Satellite images, intense tidal currents, undulating topography, and suspended sediment made it possible to explain the generation and identification of KelvinHelmholtz instabilities.
    Źródło:
    Oceanologia; 2021, 63, 3; 321-328
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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