Simulation of flow pattern in alluvial channel and 60-degree lateral intake through the numerical FLOW-3D model
Document Type : Research Paper
Authors
- 1 Assist. Professor, Soil Conservation and Watershed Management Research Department, Markazi Agricultural and Natural Resources Research and Education Center, AREEO, Arak, Iran
- 2 Water Engineering Department, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
- 3 Soil Conservation and Watershed Management Institute (SCWMRI), Tehran, Iran
Abstract
To reduce sediment entering the intake, a set of structures can be used to control sediment entry into the intake. In this study, a skimming wall structure has been used for the first time to control sediment entry into the intake. Using the three-dimensional numerical model FLOW3D, the flow field around the lateral intake located in the straight path has been numerically solved. Experiments were conducted on the flume in the laboratory, and the results of the numerical model were compared with those of the laboratory model. The results showed that by installing a skimming wall in front of the intake, the flow separation width near the bed with more sediment decreases, and increases at the level with less sediment. Inside the intake, the surface flow lines tend to the right wall, and the bottom flow lines tend to the left wall of the intake. By adding a spur dike structure at an angle of 60 degrees and at a distance of 2b from the center of the intake mouth in the main channel, the resulting velocity in the main channel is 1.5 times the two cases without a spur dike and with a skimming wall. The presence of the spur dike has increased the longitudinal velocity in the layer near the bottom by 2.25 times and the transverse velocity in the surface layer by 1.33 times compared to the case without the spur dike.
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