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Two high latitude fjords of Spitsbergen (Hornsund 77°N and Kongsfjorden 79°N) are regarded as being highly productive (70 g and 50 gC m−2 year−1) and having organic-rich sediments. Hornsund has more organic matter in its sediments (8%), nearly half of it of terrestrial origin, while most of that in Kongsfjorden (5%) comes from fresh, marine sources (microplankton). Analysis of the carbon sources in...
The river bed stability analysis at the Wkra estuary reach is presented in this paper. When a flood appears, channel and river bed erosion can reach a significant size. During such a situation, flow and water velocity exceed critical values for particular bed sediment grain sizes. This causes the breakage of bed armouring, and then bed mass motion begins. For the estimation of the sandy Wkra River...
W pracy przedstawiono wyniki badań wpływu szykan na długość odskoku hydraulicznego. Badania przeprowadzono na modelu jazu z wypływem wody spod zasuwy i niecką wypadową, w której dodatkowo zastosowano szykany w dwóch różnych ustawieniach. Długość odskoku wyznaczano na podstawie wyników pomiarów prędkości strumienia na wypadzie. Pomierzone długości odskoku porównano z wartościami obliczonymi wzorami...
The aim of the study was the comparison of the changes of cross-sections and longitudinal profi le of the Mała river at the distance of 600 m. The paper presents the geometry changes of the river from field measurements made in 2013 in comparison with design assumptions from 1967 which were implemented in 1971. The four (available historical) cross-sections (hm 7+700, 7+800, 7+900, 8+000) and longitudinal...
The study was aimed at testing the density effect in the tropical house cricket breeding on its survival and growth rate when fed ad libitum. The tropical house crickets were kept in nine containers of a volume of 81 litres each. Three experimental variants were used: 7.5 ml of crickets were placed in the first container, 15 ml in the second and 30 ml in the third. Temperature in containers was 29°C,...
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