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Drinking Water Engineering and Science An interactive open-access journal

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https://doi.org/10.5194/dwes-2017-21
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
08 Jun 2017
Review status
This discussion paper is a preprint. It has been under review for the journal Drinking Water Engineering and Science (DWES). A final paper in DWES is not foreseen.
Numerical scour modeling around parallel spur dikes in FLOW-3D
Hanif Pourshahbaz1, Saeed Abbasi1, and poorya taghvaei2 1Department of Civil Engineering, University of Zanjan, Zanjan, Iran
2Department of Civil Engineering, Semnan University, Semnan, Iran
Abstract. Spur dikes are some structures which are built in the flow path with the aim of changing flow characteristics in order to bed and bank protection in rivers. These sudden changes in properties caused by the existence of spur dikes, produces erosion and sedimentation around them. In this paper, effects of series of parallel spur dikes have been investigated numerically. For this purpose, by using experimental and numerical research results from technical literatures, the numerical model conducted in FLOW-3D commercial software and the data were compared with experimental and SSIIM results. The results showed that Froude number and the ratio of U/Ucr affect the accuracy of the models. As a result, by discharge increasing, FLOW-3D models need to be calibrated again. Also, by using a calibrated FLOW-3D model, calculation accuracy of the scour depth at the bottom of the spur dikes becomes better and the accuracy level in the modeling of the surface morphology improves 7 percent more than SSIIM software in the bottom of the first spur dike, more than 80 percent at the bottom of the second spur dike and approximately 40 percent at the bottom of the last spur dike.

Citation: Pourshahbaz, H., Abbasi, S., and taghvaei, P.: Numerical scour modeling around parallel spur dikes in FLOW-3D, Drink. Water Eng. Sci. Discuss., https://doi.org/10.5194/dwes-2017-21, 2017.
Hanif Pourshahbaz et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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EC1: 'Closure of the discussion', Luuk Rietveld, 06 Dec 2017 Printer-friendly Version 
Hanif Pourshahbaz et al.
Hanif Pourshahbaz et al.

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Short summary
In this study, the final results of FLOW-3D numerical model results were compared with experimental results and the SSIIM model results. With the aim of quantitative investigation of bed changes result, experimental and software result were compared in transverse and longitudinal sections. The results show that FLOW-3D model is more accurate than SSIIM model, while in the high discharge, FLOW-3D model accuracy is very low and unacceptable.
In this study, the final results of FLOW-3D numerical model results were compared with...
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