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Abstract

The article presents the experimental results of the calibration of the typical check structure with sluice gates installed in a trapezoidal irrigation channel. Hydraulic experiments on sluice gate discharge capacity were performed on a model made in a 1:2 scale. It has been explained how the method of measuring the downstream water depth below the sluice gate in the check structures installed in a trapezoidal irrigation channels affects the measured depth values. On the basis of hydraulic measurements, regression relationships were developed for the discharge coefficients for submerged outflow through the sluice gate in two types of sluice gates installed in irrigation channels. The formulas allow to calculate the volumetric flow rate below the submerged sluice gate after determining the water depth upstream and below the sluice gate and the gate opening height. The differences in volumetric flow rates calculated from regression relationships and measured values do not exceed 10%, which confirms their practical suitability for calculating the discharge through a sluice gate mounted in a trapezoidal channel. The values of the discharge coefficients determined in the channels with rectangular cross-sections are not useful for the discharge coefficients of sluice gates check structures installed in trapezoidal channels. Nomograms and relationships for discharge coefficients of the analysed sluice gate were developed.
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Authors and Affiliations

Elżbieta Kubrak
1
ORCID: ORCID
Janusz Kubrak
2
ORCID: ORCID

  1. Warsaw University of Life Sciences – SGGW, Water Center, Warsaw, Poland
  2. Warsaw University of Life Sciences – SGGW, Faculty of Civil and Environmental Engineering, Nowoursynowska 166, 02-787 Warsaw, Poland
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Abstract

Here are reported the first certainly indigenous agglutinated foraminifera known for the Eocene La Meseta Formation on Seymour Island, West Antarctica. The specimens were identified as Textularia sp. and occur in the upper portion of the unit, just below the contact with the overlying post-Eocene deposits. Despite being rare, the specimens are interpreted as autochthonous or parautochthonous due to their overall good preservation, fragility, and lack of sedimentary filling. The La Meseta Formation seems to have passed through a major diagenetic dissolution of calcareous microfossils, but the present findings suggest that indigenous agglutinated foraminifera can be found at least in some of its strata.

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Authors and Affiliations

Victor C.S. Badaró
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Abstract

This study contributes to the knowledge of morphology, biology and ecology of Euphausia crystallorophias. The structure of the filtratory apparatus and analysis of the stomach contents are described. Among 41 identified algae taxa 40 were diatoms. Benthic algae, numbering as many as 12 taxa constituted a high percentage in the total of food content, which may indicate that this species feeds near the bottom in the relatively shallow shelf-waters.

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Authors and Affiliations

Wojciech Kittel
Ryszard Ligowski
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Abstract

The article gives an account of a legally unprecedented instance of utilisation of offshore platform ‘Odyssey’ and her accompanying ship ‘Sea Launch Commander’ for launching satellites into orbit. The platform is operated by an international partnership company called ‘Sea Launch’, which unites commercial undertakings within space and maritime industries from USA, Russia, Ukraine and Norway. The article discusses selected legal issues arising in areas of law of the sea, admiralty and space law, as well as issues relating to coordination of partners’ efforts in legal and administrative spheres. The company eventually went through bankruptcy (Chapter 11) procedure; the author investigates legal and economic causes of this matter. Finally, the article iterates proposal for a new international convention on space transport, which would include a comprehensive regulation on launching objects into space from offshore facilities.

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Authors and Affiliations

Leonard Łukaszuk

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