Experimental study of flow pattern and sediment behavior near the intake structures using the spur dike and skimming wall

Amir Moradinejad,Seyed Mahyar Zamanieh Shahri,Mojtaba Saneie,Amir Ghaderi

doi:10.1007/s13201-019-1069-7

Amir Moradinejad, Seyed Mahyar Zamanieh Shahri + Show 2 more

Open Access

https://doi.org/10.1007/s13201-019-1069-7

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Abstract

Channel junctions and lateral intakes are always caused turbulence in the passing flow. In this research, an experimental study was carried out to explore a possible method for sediment control for a series of skimming walls and a single spur dike, simultaneously. In order to direct the flow into the diversion channel and increase the skimming wall function, a single spur dike was utilized at the opposite side of the intake channel. The flow patterns for three conditions, including (1) without structures, (2) with skimming wall and (3) skimming wall and spur dike, are considered. The results showed that the use of skimming wall and a combination of skimming wall and spur dike makes it possible to direct the thalweg toward the intake port. In addition, by using the skimming wall, a trench is made toward the intake, which in turn increases the impoundment efficiency by 81% in the skimming wall combined with spur dike and up to about 66% for using the skimming wall.

Highlights

Intake structures divert some portion of the flow from rivers and may cause some changes in hydraulic conditions of the flow at the entrance
To study the flow patterns in alluvial bed, the bed considered modular, which provides the possibility of better understanding the phenomena governing the process without changing the bed
The results showed that by using a skimming wall and spur dike, the thalweg directs toward the intake port

Summary

Introduction

Intake structures divert some portion of the flow from rivers and may cause some changes in hydraulic conditions of the flow at the entrance. Spur dikes are simple hydraulic structures which are used to organize river bends or their straight line They are used to control erosion and protect river banks and are of the deviation type (Moradinejad et al 2017; Daneshfaraz et al 2015). This structure causes changes in the flow pattern due to the reduction in the flow separation at the bottom. Neary et al (1999) developed a 3D numerical model of a 90° intake in a rectangular channel and verified this model using experimental results According to their findings, as the flow diversion ratio increases, the width of the vortex area and its length first decreases and increases. Ramamurthy et al (2007) demonstrated that increasing the flow diversion ratio reduces the length and width of the flow separation zone in

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