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1
Content available remote Wind wave climate of west Spitsbergen : seasonal variability and extreme events
Wojtysiak K., Herman A., Moskalik M.
Oceanologia
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2018
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No. 60 (3)
331--343
EN
Waves are the key phenomenon directly influencing coastal morphodynamics. Facing insufficient observations, wind wave climate of the west coast of Spitsbergen can be characterized on the basis of the modelled data. Here we have used the results of spectral wave models: Wave Watch III (WW3) hindcast and WAM in ERA-interim (ERAi) reanalysis. We have observed the presence of seasonal cycle with difference of up to 1 m between significant wave heights in summer and winter. In wave-direction analysis we have noticed the southwestern swell component of remarkably narrow width, thus we expect unidirectional swell impact on the coastline. Extreme events analysis revealed that storms occur mainly in winter, but the most energetic ones (significant wave height of up to 9.5 m) occur in spring and autumn. We have identified positive trends in storms’ frequency (2 storms per decade) and storms’ total duration (4 days per decade) on the south of the study area. More storms can result in the increase of erosion rate on the south-western coasts of Spitsbergen, but this change may be highly dependent on the sea ice characteristics. Wave heights of wind sea and swell are correlated with the relevant atmospheric circulation indices, especially the North Atlantic Oscillation. In the recent decade, the correlation is stronger with WW3 than with ERAi data, at some locations explaining over 50% (over 30%) of the total variance of wind sea (swell) wave heights. In ERAi data, the relationship with circulation indices seems sensitive to the length of the analysis period.
2
Content available remote Spatiotemporal changes in the concentration and composition of suspended particulate matter in front of Hansbreen, a tidewater glacier in Svalbard
Moskalik M., Ćwiąkała J., Szczuciński W., Dominiczak A., Głowacki O., Wojtysiak K., Zagórski P.
Oceanologia
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2018
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No. 60 (4)
446--463
EN
Tidewater glaciers supply large amounts of suspended particulate matter (SPM) and freshwater to fjords and affect oceanographic, sedimentological and biological processes. Our understanding of these processes, is usually limited to the short summer season. Here, we present the results of a one-year-long monitoring of the spatial variability in SPM characteristics in a context of oceanographic and meteorological conditions of a glacial bay next to Hansbreen, a tidewater glacier in Hornsund (southern Spitsbergen). The observed range of SPM concentrations was similar to ranges measured in other sub-polar glaciated fjords, especially in Svalbard. The major source of SPM is the meltwater discharge from the glacier. The maximum water column-averaged SPM concentrations did not correlate with peaks in freshwater discharge and were observed at the beginning of the autumn season, when the fjord water transitioned from stratified to fully mixed. The observed spatiotemporal variations in the total SPM, particulate organic matter (POM) and particulate inorganic matter (PIM) are likely controlled by a combination of factors including freshwater supply, water stratification and circulation, bathymetry, the presence of sea ice, biological productivity and sediment resuspension. During the ablation season, the SPM maximum concentrations were located within the upper water layer, whereas during the winter and spring, the greatest amounts of SPM were concentrated in deeper part. Thus, typical remote sensing-based studies that focus on SPM distributions may not reflect the real SPM levels. POM and PIM concentrations were correlated with each other, during most of the time suggesting that they may have a common source.
3
Content available remote Principal Component and Cluster Analysis for determining diversification of bottom morphology based on bathymetric profiles from Brepollen (Hornsund, Spitsbergen)
Moskalik M., Tęgowski J., Grabowiecki P., Żulichowska M.
Oceanologia
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2014
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No. 56 (1)
59--84
EN
Navigation charts of the post-glacial regions of Arctic fjords tend not to cover regions from which glaciers have retreated. Whilst research vessels can make detailed bathymetric models using multibeam echosounders, they are often too large to enter such areas. To map these regions therefore requires smaller boats carrying single beam echosounders. To obtain morphology models of equivalent quality to those generated using multibeam echosounders, new ways of processing data from single beam echosounders have to be found. The results and comprehensive analysis of such measurements conducted in Brepollen (Hornsund, Spitsbergen) are presented in this article. The morphological differentiation of the seafloor was determined by calculating statistical, spectral and wavelet transformation, fractal and median filtration parameters of segments of bathymetric profiles. This set of parameters constituted the input for Principal Component Analysis and then in the form of Principal Components for the Cluster Analysis. As a result of this procedure, three morphological classes are proposed for Brepollen: (i) steep slopes (southern Brepollen), (ii) flat bottoms (central Brepollen) and gentle slopes (the Storebreen glacier valley and the southern part of the Hornbreen glacier valley), (iii) the morphologically most diverse region (the central Storebreen valley, the northern part of the Hornbreen glacier valley and the north-eastern part of central Brepollen).
4
Content available remote Strategie rozwojowe miejskich przedsiębiorstw ciepłowniczych
Daniluk A., Moskalik M.
Biuletyn Urzędu Regulacji Energetyki
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2001
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nr 1
33-36
5
Content available remote Cepłownictwo w Polsce - charakterystyka przedsiębiorst koncesjonowanych - część I
Buńczyk A., Daniluk A., Głukowska-Sobol A., Moskalik M.
Biuletyn Urzędu Regulacji Energetyki
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2001
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nr 6
15-25
6
Content available remote Warsztaty regulatora
Buńczyk A., Moskalik M.
Biuletyn Urzędu Regulacji Energetyki
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2000
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nr 5
13-19
7
Content available remote Time-frequency analysis of EMG signals
Moskalik M., Poręba T., Sokołowski M.
Automatyka / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
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1999
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T. 3, z. 2
403-411
EN
The results obtained by means of well known short-time Fourier transform is compared with the new approach, the wavelet transform. The influence of muscle fatiguing contractions on the myoelectric signal is examined. The results of experimental investigations are shown on figures.
PL
W artykule porównano wyniki uzyskane przy pomocy tradycyjnej krótkookresowej transformaty Fouriera z rezultatami analizy otrzymanymi dzięki transformacie falkowej. Badano wpływ zmęczenia mięśni w wyniku skurczów na elektromiogram (sygnał EMG). Otrzymane wyniki badań eksperymentalnych zamieszczono na rysunkach.
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