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    Wyświetlanie 1-11 z 11
    Tytuł:
    Wave-induced bottom shear stress estimation in shallow water exemplified by using deep water wind statistics
    Autorzy:
    Myrhaug, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/47582.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    shallow water
    deep water
    wind
    water
    circulation model
    shear stress
    mud deposit
    coastal zone
    estuarine zone
    bottom sediment
    Opis:
    The paper provides a simple and analytical method which can be used to give estimates of the wave-induced bottom shear stress for very rough beds and mud beds in shallow water based on wind statistics in deep water. This is exemplified by using long-term wind statistics from the northern North Sea, and by providing examples representing realistic field conditions. Based on, for example, global wind statistics, the present results can be used to make estimates of the bottom shear stress in shallow water.
    Źródło:
    Oceanologia; 2017, 59, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compensatory growth of the bloom-forming dinoflagellate Prorocentrum donghaiense induced by nitrogen stress
    Autorzy:
    Cai, Z.
    Duan, S.
    Zhu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/47798.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    compensatory growth
    Prorocentrum donghaiense
    nitrogen stress
    algal bloom
    dinoflagellate
    water system
    nitrogen concentration
    Źródło:
    Oceanologia; 2013, 55, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wave-induced stresses and pore pressures near a mudline
    Autorzy:
    Sawicki, A.
    Staroszczyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48728.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    water pressure
    wave-induced stress
    elasto-plasticity
    earth pressure coefficient
    soil permeability
    pore water saturation
    yield condition
    seabed mechanics
    Opis:
    Conventional methods for the determination of water-wave induced stresses in seabeds composed of granular soils are based on Biot-type models, in which the soil skeleton is treated as an elastic medium. Such methods predict effective stresses in the soil that are unacceptable from the physical point of view, as they permit tensile stresses to occur near the upper surface of the seabed. Therefore, in this paper the granular soil is assumed to behave as an elastic-ideally plastic material, with the Coulomb-Mohr yield criterion adopted to bound admissible stress states in the seabed. The governing equations are solved numerically by a finite difference method. The results of simulations, carried out for the case of time-harmonic water waves, illustrate the depth distributions of the excess pore pressures and the effective stresses in the seabed, and show the shapes of zones of soil in the plastic state. In particular, the effects on the seabed behaviour of such parameters as the degree of pore water saturation, the soil permeability, and the earth pressure coefficient, are illustrated.
    Źródło:
    Oceanologia; 2008, 50, 4; 539-555
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meteorological influences on the surface hydrographic patterns of the North Aegean Sea
    Autorzy:
    Sylaios, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/48232.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    water mass
    Baltic Sea
    Aegean Sea
    sea water
    hydrographic data
    wind stress
    bottom topography
    meteorological influence
    hydrographic pattern
    Anthos Peninsula
    salinity
    Opis:
    Hydrographic data from the North Aegean Sea were used to examine the summer variability of surface water masses during the period 1998–2001. Attention was placed on the surface hydrographic features of the area, such as the Black Sea Water (BSW) plume expansion, the frontal characteristics of the BSW with the Levantine Intermediate Water (LIW) and the variability of submesoscale hydrographic features (such as the Samothraki Anticyclone). Strong southerly wind stresses were found responsible for relaxing the horizontal density gradients across the BSW-LIW frontal zone and displacing this front to the north of Lemnos Island, thus suppressing the Samothraki Anticyclone towards the Thracian Sea continental shelf. Under northerly winds, the BSW-LIWfront returns to its regular position (south of Lemnos Island), thus allowing the horizontal expansion of the Samothraki gyre up to the Athos Peninsula. Present results indicate the importance of medium-term wind stress effects on the generation of Samothraki Anticyclone suppression/expansion events.
    Źródło:
    Oceanologia; 2011, 53, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical aspects of extreme storm surges and falls on the Polish coast
    Autorzy:
    Wisniewski, B.
    Wolski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/49192.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    atmospheric precipitation
    atmospheric pressure
    deformation
    evaporation
    fall
    meteorological factor
    Polish coast
    sea level
    sea surface
    storm surge
    water density
    water exchange
    wind stress
    wind velocity
    Opis:
    Extreme sea levels – storm-generated surges and falls – on the Polish coast are usually the effects of three components: the volume of water in the southern Baltic (the initial level preceding a given extreme situation), the action of tangential wind stresses in the area (wind directions: whether shore- or seaward; wind velocities; and wind action duration), and the sea surface deformation produced by deep, mesoscale baric lows moving rapidly over the southern and central Baltic that generate the so-called baric wave. Among these factors, the baric wave is particularly important for, i.e. the water cushion underneath the baric depression, moving along the actual atmospheric pressure system over the sea surface.
    Źródło:
    Oceanologia; 2011, 53, (1-TI)
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutrient flux fuels the summer primary productivity in the oligotrophic waters of the Gulf of Aqaba, Red Sea
    Autorzy:
    Badran, M.I.
    Rasheed, M.
    Manasrah, R.
    Al-Najjar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47744.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Aqaba Gulf
    biological stress
    diffusion model
    chlorophyll a
    oligotrophic water
    primary productivity
    thermohaline stratification
    nutrient flux
    Red Sea
    Opis:
    The thermohaline characteristics of the Gulf of Aqaba, Red Sea, depict a welldefined seasonal pattern of winter mixing from December to April and summer stratification from May to November. This thermohaline structure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a concentration records generated down to 200 m at a vertical resolution of 25 m – weekly during 1994, 1995 and every two weeks from April 1997 through to December 2000 – are employed to assess the nitrogen flux across the summer thermocline of the Gulf of Aqaba. The flux calculations are based on a simple diffusion model that incorporates the physical stress eddy diffusivity factor Kz and a biological stress factor k. Both Kz and k are calculated using the Michaelis-Menten equation and the nitrate concentration gradient. The total nitrate flux of the Gulf of Aqaba during the seven summer months (May–November) is estimated at 0.52 moleN m−2. In relation to established primary productivity values (75.5 gC m−2 (May November)−1) and the generated chlorophyll a records, this yields an f fraction of new to total primary production of 0.50. This relatively high f value is discussed with respect to the geophysical characteristics of the Gulf of Aqaba and similar oceanic basins. The remaining 50% is accounted for by cross-sectional flow from the relatively nutrientrich coral reef coastal habitat and rapid recycling, triggered by high irradiance and water temperature.
    Źródło:
    Oceanologia; 2005, 47, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water column conditions in a coastal lagoon near Jeddah, Red Sea
    Autorzy:
    Albarakati, A.M.A.
    Ahmad, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/48751.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    water column
    coastal lagoon
    Red Sea
    heat balance
    air-sea interface
    stratification
    wind stress
    heat flux
    bottom topography
    Źródło:
    Oceanologia; 2012, 54, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of cadmium and glutathione on malic enzyme activity in brown shrimps (Crangon crangon) from the Gulf of Gdansk
    Autorzy:
    Niedzwiecka, N.
    Mika, A.
    Bialek-Bielinska, A.
    Stepnowski, P.
    Skorkowski, E.F.
    Powiązania:
    https://bibliotekanauki.pl/articles/48865.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    abdominal muscle
    cadmium
    cellular mechanism
    Crangon crangon
    Gdansk Gulf
    glutathione
    heavy metal
    malic enzyme
    oxidative stress
    shrimp
    water pollution
    Opis:
    The high level of cadmium in the abdominal muscle of the brown shrimp Crangon crangon is due to the serious pollution of the water in the Gulf of Gdańsk. The inhibition of malic enzyme (ME) activity by cadmium, and in consequence the reduced formation of NADPH, could interfere with cellular mechanisms for detoxifying the organism and reducing oxidative stress. The reduced glutathione (GSH) concentration in the abdominal muscle of C. crangon was calculated to be 5.8 mM. The objective of this study was to evaluate the part played by GSH in the effect of cadmium on the activity of NADP-dependent malic enzyme from abdominal muscles of brown shrimps. This enzyme is activated by certain divalent cations (Mg, Mn). The results demonstrate that cadmium inhibits ME activity from shrimp muscle, and that GSH and albumin can reduce this cadmium-inhibited NADP-dependent malic enzyme activity.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Motion of water and sediment due to non-breaking waves in the swash zone
    Autorzy:
    Kapinski, J.
    Ostrowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48514.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    water motion
    sediment
    non-breaking wave
    flow velocity
    sediment transport
    spatial variability
    sandy shore
    swash zone
    Baltic Sea
    shear stress
    Opis:
    A long wave run-up theory is applied to the modelling of wave-induced flow velocities, sediment transport rates and bottom changes in a swash zone. First, the properties of the water tongue motion and the resulting lithodynamic response are analysed theoretically. Next, an attempt is made to run the model for the natural conditions encountered on the southern Baltic Sea coast. The Lagrangian swash velocities are used to determine the Eulerian phase-resolved bed shear stresses with a momentum integral method, after which the motion of sand is described by the use of a two-layer model, comprising bedload and nearbed suspended load. Seabed evolution is then found from the spatial variability of the net sediment transport rates. The results presented are limited to cases of the small-amplitude waves that seem to be responsible for accretion on beaches.
    Źródło:
    Oceanologia; 2012, 54, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution and fate of polycyclic aromatic hydrocarbons (PAHs) in recent sediments from the Gulf of Gdańsk (SE Baltic)
    Autorzy:
    Lubecki, L.
    Kowalewska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/48378.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    Gdansk Gulf
    Vistula River
    anthropogenic stress
    distribution
    environment parameter
    hydrocarbon
    marine area
    organic carbon
    pollution
    polycyclic aromatic hydrocarbon
    sediment
    water
    Źródło:
    Oceanologia; 2010, 52, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of nutrient transport from different depths during an upwelling event in the Gulf of Finland
    Autorzy:
    Vali, G.
    Zhurbas, V.
    Laanemets, J.
    Elken, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48984.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    ecohydrodynamic model
    Finland Gulf
    nutrient transport
    phosphorus
    phytoplankton biomass
    princeton ocean model
    remote sensing
    simulation
    upwelling
    water transport
    wind
    wind stress
    Opis:
    Numerical simulation experiments with a high-resolution circulation model were carried out to study nutrient transport from different depths to the surface 10-m layer during an upwelling event along the northern coast of the Gulf of Finland in July 1999. The initial nutrient distribution is based on field measurements performed in the north-western part of the Gulf. Wind forcing covering the period of the upwelling along the northern coast was turned through 180◦ to simulate an upwelling along the southern coast. The simulation results showed that the main phosphorus transport to the upper 10-m layer occurred from depths shallower than 30 m for the upwelling events along both the northern and the southern coasts. Nitrogen transport to the upper 10-m layer was the largest from depths of 40–55 m for the upwelling along the northern and 40–65 m for the upwelling along the southern coast. Simulated cumulative volume transports to the upper 10-m layer from different depths showed that the contribution from deeper layers was larger in the case of the upwelling along the southern coast. The reduction of wind stress had a bigger influence on water transport from the deeper layers.
    Źródło:
    Oceanologia; 2011, 53, (1-TI)
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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