Influence of the bottom sills on the flow scouring capacity on the foothill areas of the rivers
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2018, Vol 1, Issue 73
Abstract
The regulation of riverbeds with the help of hydrotechnical constructions is one of the most widespread flood protection methods used on the rivers of the Ukrainian Carpathians. Analysis of a priori information (results of field observations, normative and design documentation) determined the range of changes in the main hydraulic parameters of the water flow and the size of the bottom sills. The purpose of hydraulic studies was to study the influence of bottom sills on the flow scouring capacity on the foothill areas of the rivers during floods. The theoretical studies of the flow scouring capacity were carried out according to the Nikitin's recommendations. During the execution of the experiments, for each height of the bottom sills set corresponding costs and bottom slope, which provides received, according to the scheduling matrix Froude number and full-supply depth. In order to test the suitability of the Nikitin's recommendations for our conditions were met the experimental investigation of sediment particles stability from the existing factors in the case where the flat-bottomed flume decorated with a cement-sand mortar. Investigation of the influence of the acting factors on the diameters of sediment particles resistant to erosion was carried out at a Froude number equal to 0,8 and a full-supply depth of 0,15 m for the case where the bottom was finished with a cement-sand mortar. Analysis of the laboratory studies results has shown that the installation of the bottom sills to an increase in the flow depth and, accordingly, to a decrease in the diameter of the sediment particles forming the bottom, that is, the eroded flow capacity before the bottom sills. The results of laboratory studies have made it possible to determine the effect of the bottom sills on the change in the flow depth ahead of them and on its erosive capacity. The results obtained are basic for the development of a methodology for the designing bottom sills to stop deep erosion on the foothill areas of the rivers.
Authors and Affiliations
L. R. , Yasinska, O. V. , Bezusyak, L. O. , Tokar, I. E. , Kosynska
Keywords
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