Abstract
Channels junction is a phenomenon which is used in most of irrigating and drainage networks and in hydraulic engineering in general. In two channels junction, main and secondary channels encounter with each other and move to the channel downstream. Scour holes and sedimentation zones are created in channels bed. 3D simulation of scour hole created in these channels is influenced by various factors. The ratio of main channel width to secondary channel width is one of the most important influencing factors. This parameter is the main focus of the present research. In the present study, a model calibrated with laboratory results has been simulated. The numerical model results have revealed that decreasing the ratio of main channel width to secondary channel width causes the secondary channel flow encounters to the front wall of the secondary channel. Also, it leads to creating scour near the front wall and the main hole is drawn towards the wall. Furthermore, in the present research, topographical changes of the bed with running time of the numerical model for the middle channel axis has been extracted and presented.
Highlights
As one of the complex phenomenon considered in open channels related studies, it can be referred to the movement of deposition s with water flow and deposition or erosion of channel
The scour depth is increased a result of flow velocity increase; the maximum scour depth occurs under clear water conditions and at deposition particle movement [1, 2]
The effect of various variables such as the discharge ratio of the main channel to secondary channel and the width ratio of the main channel to secondary channel was investigated on movement threshold and scour hole depth was modelled as numerical calibration in a 50-degree junction
Summary
As one of the complex phenomenon considered in open channels related studies, it can be referred to the movement of deposition s with water flow and deposition or erosion of channel. This phenomenon is more complex in channels junction. In the study conducted by Biswal et al (2016), hydraulic parameters changes of flow were explored at depth direction To this end, they used turbulence models to investigate various velocity values in flow depth and water surface profile under different geometrical conditions of channel [7]
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