FLOW FIELD AND SCOURING AROUND SERIES OF TRIPLEX SPUR DIKES IN SHARP BEND

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IRANSHAHI M.; GHODSIAN M.; VAGHEFI M.

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Journal: Modares Civil Engineering journal Year:2016 | Volume:16 | Issue:3 Page(s): 1-12

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Title

FLOW FIELD AND SCOURING AROUND SERIES OF TRIPLEX SPUR DIKES IN SHARP BEND

Author(s)

IRANSHAHI M. | GHODSIAN M. | VAGHEFI M. | Issue Writer Certificate

Keywords

FLOW FIELDQ2

SCOURQ2

SERIES OF SPUR DIKESQ2

REPELLENTQ2

SHARP BENDQ2

Abstract

Spur dike is one of the river training structures used for deviating the river flow from critical and erodible areas towards the central axis. As a result of flow, a zone with high turbulence around the spur dike is developed. The hydraulic process results development of the SCOUR hole around the spur dike and settlement of sediment in the downstream and sides of the river. Several plan view shapes, such as straight, T-shape, and L-shape of spur dike have been constructed worldwide in accordance with different river environments. While SCOURing in spur dike structures results a serious threat to the river so it is needed to be investigated in this field. This paper describes FLOW FIELD and SCOURing around series of Triplex rippling spur dikes (directed to the upstream) with a distance of 3.5 times of the effective length of the spur dike in the outer bank of a SHARP BEND channel. The first spur dike is located at section 30 degree from the start of bend. The experimental channel is a 90 degree channel with rectangular section. The radius of curvature to the channel width is 2, which is classified as a SHARP BEND. The bed materials used are uniform sand with mean diameter of 1.28 mm, its standard deviation coefficient of 1.3 and the relative density of sediment 2.35. Constant discharge of 25 l/s was used in the experiments. The results of FLOW FIELD on flat bed and a SCOURing experiment are presented. The SCOURing test was done in 24 hours and in the moving threshold (U/Uc = 0.98) under clear water condition. FLOW FIELD was recorded using the Vectrino II profiling velocimeter (NORTEK) as it can profile water in a 3 cm column. Dye injection technique is also used for flow observation. It was found that in the levels upstream of the first spur dike and adjacent to the bed, stream lines are deviated towards the inner bank. While in the middle levels, flow lines upstream of the spur dike is almost parallel to the channel walls and approached the spur dike, resulting deviation in the separation zone. In the SCOURing experiment it was obvious that at the beginning of the experiment, thus creating the down flow upstream of the spur dikes, SCOURing initiates near the wing of each spur dike and further develops by the horseshoe vortex. Then after SCOUR hole upstream of the second and third spur dike starts. Details of sediment movements at the beginning of the experiment and after development of the SCOUR hole are addressed. The circulation flows and secondary flows which formed in bend and the position of separation zone at different layers are also discussed. SCOURing experiment illustrate that the amount of SCOUR at the upstream of the second spur dike is about 33 % and at the upstream of the third spur dike is about 81 % of the maximum amount of SCOUR that occurs upstream of the first spur dike. The mechanism of SCOUR and FLOW FIELD are also studied in this paper.

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APA: Copy

IRANSHAHI, M., GHODSIAN, M., & VAGHEFI, M.. (2016). FLOW FIELD AND SCOURING AROUND SERIES OF TRIPLEX SPUR DIKES IN SHARP BEND. MODARES CIVIL ENGINEERING JOURNAL, 16(3), 1-12. SID. https://sid.ir/paper/256680/en

Vancouver: Copy

IRANSHAHI M., GHODSIAN M., VAGHEFI M.. FLOW FIELD AND SCOURING AROUND SERIES OF TRIPLEX SPUR DIKES IN SHARP BEND. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(3):1-12. Available from: https://sid.ir/paper/256680/en

IEEE: Copy

M. IRANSHAHI, M. GHODSIAN, and M. VAGHEFI, “FLOW FIELD AND SCOURING AROUND SERIES OF TRIPLEX SPUR DIKES IN SHARP BEND,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 3, pp. 1–12, 2016, [Online]. Available: https://sid.ir/paper/256680/en

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