INFLUENCE OF TURBULENCE OF FLOW ON SIZES LOCAL SCOUR ON WEIR MODEL
Autor
Janusz Urbański
Pages
3–12
Keywords
physical modeling, weir, local scour
Abstract
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The paper presents the results of laboratory analysis of local scour in weir model with spillway, water basin and bed protection in downstream. The length of the bed protection was variable and was 0.50, 1.00, 2.00 m equal. The weir model was made in rectangular hydraulic channel which was 1.0 m wide. As a material to be eroted the sorted sand with d50 = 1.1 mm was used. During the experiments the measurement of the depth of the scour and velocity in cross section of the end of bed protection was made. The results of laboratory tests enable to estimate the influence of turbulence characteristics for the size of local scour. Extending of bed protection zone downstream of structure providing reduction of flow turbulence and by this - slowing down of erosion process in time and limitation dimension of local scour.
The paper presents discharge variability of the Samica Stęszewska River in Stęszew cross-section. The study was carried out in the catchment area of 109 km2 in the hydrological years 2001-2007. The results have shown that outflow distribution was dependent on the weir exploitation, which is located on the Samica Stęszewska outflow from Niepruszewskie Lake. Our study indicated that in the years of the similar precipitation the complementary index of hydrological disturbances in the Stęszew cross-section was ten times lower in 2001 (during damming) than in 2007 (without damming). Also, indexes of the monthly discharges were much lower in 2001 than in 2007. They ranged from 0.59 to 1.55 and from 0.27 to 3.72, respectively. In 2001 the exploitation of the weir increased ac-tive retention in the Niepruszewskie Lake almost two times.
THE ANALYSIS OF BEARING CAPACITY OF SELECTED PAD FOUNDATIONS OF WATER CENTER BUILDING OF WARSAW UNIVERSITY OF LIFE SCIENCES - SGGW BASED ON PN-81/B-03020 AND EN 1997-1 EUROCODE 7
This paper presents the results of calculations of bearing capacity of soils for selected pad foundations of Water Center building of Warsaw University of Life Sciences - SGGW, based on polish standard and Eurocode 7. The calculations show that procedure based on methodology shown in both standards leads to different results. The cause of this state are differences in values and way of taking into account of partial factors and differences in values of particular factors used in formula for calculation of overall value of bearing resistance of soil.
ANALYSIS OF RELATIONS BETWEEN METHODS (THE VE-BE METHOD AND THE PROPAGATION TABLE METHOD). OF EXAMINING THE CONSISTENCE OFACONCRETE MIX
Autor
Konrad Podawca, Michał Tupacz
Pages
39–50
Keywords
concrete, concrete mix, consistency, the Ve-Be method, the spilling table method
Abstract
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The paper presents the comparison of the results of the consistency test with the Ve-Be method according to the PN-88/B-06250 and spilling table method, introduced in PN-EN 206-1. The aim of the work was to obtain of a mathematical relation between two selected methods of examining the consistence of a concrete mix: the Vebe method and the spilling table method.
Mansion/grange complexes have been developing over centuries. They have ap-peared in Lower Silesia relatively early and subjected to intense development, first and foremost due to high-quality of soils existing in the region under consideration. Lower Sile-sian rural settlement structures, wherein either grange or mansion/grange layouts have been established, feature very interesting rural arrangements. On the grounds of studies having been made, three fundamental typologies were distinguished: 1) basing on analyses of rural arrangement of country settlements, the relations between grange and village were determi-ned; 2) upon detailed review of spatial compositions of selected mansion/grange layouts, the typology due to spatial development arrangement was provided; 3) the functions of individual granges have been reviewed and typology due to the representative/economic functions was distinguished. It shall be born in mind that grange complexes, despite that they were independent and self-sufficient territorial units, were always inseparable from spatial composition of the remaining village portions. They had great effect on not only rural character of specific place, but also its architecture.