Modern technologies in the study of processes in channels

Abstract

In the article, river bed research was conducted in the Neverice channel near the city of Nitra, Slovak Republic. Relationships of morphometric parameters in Neverice channel were studied based on GIS technologies. Orthophotomosaic images created by National Forest Center (NLC) and Geodetic and Cartographic Institute Bratislava (GKÚ) were used. Downloaded images were analyzed using ArcGIS Pro software. In the analysis 3 characteristic blocks were selected along the length of the channel. The cross-sections surface of the channel is drawn for each frame and the slope of the channel bottom is determined. The DEM model was used to determine the slope of the channel bottom and 3D model is created. The changes taking place in the river bed are analyzed and conclusions are presented.

Comprehensive Analysis of the Research Results of Wear Resistance and Physical and Mechanical Properties of Composite Polymer Materials

“…The highest wear rate of epoxy compositions filled with fluoroplastic and polyethylene is associated with a decrease in the hardness of the material (see Table 3). At the same time, the wear resistance of compositions filled with polyethylene is higher compared to the wear resistance of compositions filled with fluoroplastic, which is explained by the difference in the hardness of the composition, despite the similar hardnesses of the fluoroplastic fillers themselves (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45) and polyethylene (40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50).…”

Draft sprinkler irrigation system design development

“…The Darcy-Weisbach formula is used to calculate the longitudinal loss in pipes. Darcy Weisbach's equation has the following form [1,7,14,19]:…”

“…The average velocity of the flow is said to be the ratio of the flow rate of the water flow to the moving cutting surface. This velocity, in turn, affects the flow regime, and the Reynolds number for the pipes is calculated as follows [1,2,4,7]:…”

Geographic information system technologies in the study of deformation in rivers

“…Due to channel bends and other causes of transverse circulation in the current, the area of greatest depth tends to move from one bank to the other. Cross section of trunk is determined by the conditions of the trunk formation [16,17].…”