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1
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Some characteristic wave energy dissipation patterns along the Polish coast

100%
Rozynski G., Szmytkiewicz P.
Oceanologia
|
2018
|
tom 60
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nr 4
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Megascale rhythmic shoreline forms on a beach with multiple bars

81%
Pruszak Z., Rozynski G., Szmytkiewicz P.
Oceanologia
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2008
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tom 50
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nr 2
183-203
The study, carried out in 2003 and 2006 at the Lubiatowo Coastal Research Station (Poland), located on the non-tidal southern Baltic coast (tidal range < 0.06 m), focused on larger rhythmic forms (mega-cusps) with wavelengths in the interval 500 m > Lc > 20 m. Statistical analyses of detailed shoreline configurations were performed mostly with the Discrete Wavelet Transform method (DWT). The beach is composed of fine sand with grain diameter D50 ≈ 0.22 mm, which produces 4 longshore sandbars and a gently sloping seabed with β = 0.015. The analysis confirms the key role of bars in hydro- and morphodynamic surf zone processes. The hypothesis was therefore set up that, in a surf zone with multiple bars, the bars and mega-scale shoreline rhythmic forms form one integrated physical system; experimental evidence to substantiate this hypothesis was also sought. In such a system not only do self-regulation processes include swash zone phenomena, they also incorporate processes in offshore surf zone locations. The longshore dimensions of large cusps are thus related to the distances between periodically active large bed forms (bars). The spatial dimension of bar system activity (number of active bars) depends, at a given time scale, on the associated hydrodynamic conditions. It was assumed that such a time scale could include either the development and duration of a storm, or a period of stable, yet distinct waves, capable of remodelling the beach configuration. The indentation to wavelength ratio of mega-cusps for the studied non-tidal dissipative environment may be one order of magnitude greater than for mesotidal, reflective beaches.
3
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Long period oscillations in the longshore current on a sandy, barred coast investigated with singular spectrum analysis

80%
Kaczmarek J., Rozynski G., Pruszak Z.
Oceanologia
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2005
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tom 47
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nr 1
The presence of infragravity waves in nearshore regions can be sought in the records of both water levels and wave-driven longshore currents. For this reason, time series of such currents in close proximity to the shoreline were analysed using Singular Spectrum Analysis (SSA). Simultaneously, the results obtained with this method were confronted with the output of Discrete Wavelet Transform (DWT), which had previously been applied to this data. The records of longshore currents were collected on a daily basis during field experiments in the autumns of 2002 and 2003 with sampling rates of 3 Hz and 0.5 Hz. This produced a large data set that allowed for the use of an advanced signal processing technique, capable of extracting patterns characteristic of low-, medium- and high-frequency bands. It provided similar evidence to that produced by DWT for the existence of infragravity waves along a dissipative coast with multiple bars. The study also demonstrated the utility of SSA for studies on coastal hydrodynamics. It also showed up the better user-friendliness of DWT in terms of pattern extraction and interpretation. On the other hand, SSA demonstrated a higher precision of pattern extraction once the DWT output was known, which is a manifestation of the synergy of the two methods when applied jointly.
4
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Basic for a valuation of the Polish Exclusive Economic Zone of the Baltic Sea: Rationale and quest for tools

32%
Weslawski J. M., Andrulewicz E., Kotwicki L., Kuzebski E., Lewandowski A., Linkowski T., Massel S. R., Musielak S., Olanczuk-Neyman K., Pempkowiak J., Piekarek-Jankowska H., Radziejewska T., Rozynski G., Sagan I., Skora K. E., Szefler K., Urbanski J., Witek Z., Wolowicz M., Zachowicz J., Zarzycki T.
Oceanologia
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2006
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tom 48
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nr 1
This paper summarises current knowledge of goods and services in the Polish Exclusive Economic Zone of the Baltic Sea ecosystem. It reviews specific properties of the Baltic that could be used for economic valuation. Goods and services range from the familiar resources of fish and minerals, which were valued with the Productivity Method, to less obvious services provided by the ecosystem such as biofiltration in coastal sands, valued with either the Replacement Cost or Damage Cost Avoided methods. Disservices to the marine ecosystem are also considered, e.g. erosion and coastal flooding, including the costs of planned mitigating measures. This paper emphasises the importance of using valuation methods to help make better-educated decisions for the sustainability of the Baltic Sea.
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