Determination of Discharge Coefficient in Gabion Weirs at Free and Submerged Condition

Document Type : Research Paper

Authors

Abstract

Weirs are hydraulic structures that are built for regulating, controlling and diverting water in
the flow direction. Gabion structures are used extensively in water projects due to the ease of
construction, permeability, accessibility and economic efficiency. Porous gabion structures are
adaptable to the environment due to their material and performance and also are valuable from
ecologic view point. In this study, 8 physical models of gabion weirs and 2 models of solid weirs
were built for determining discharge coefficient in gabion rectangular broad crested weirs.
Comparisons between gabion weirs with solid weirs were done and they showed that the discharge
coefficient in gabion weirs was greater than that in solid weirs. In addition, the regression relations
based on the dimensional analysis for the flow through gabion weirs were obtained for both the free
and submerged conditions. Results showed that the discharge coefficient of gabion weirs in free
condition was 16.7 % greater than that of the submerged condition.

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References

منابع مورداستفاده
Chanson H, 2006. Discussion of discharge through a permeable rubble mound weir. Journal of Hydraulic Engineering 132(4): 432-434.
Gogos M, Defne Z and Ozkandemir V, 2006. Broad-crested weirs with rectangular compound cross sections. Journal of Irrigation and Drainage Engineering 132(3): 272-280.
Hager H and Schwalt M, 1994. Broad-crested weir.  Journal of Irrigation and Drainage Engineering 120(1): 13-26.
Kells JA, 1993. Spatially varied flow over rock fill embankments. Canadian Journal of Civil Engineering 20: 820-827.
Kells JA, 1994. Reply on discussion of spatially varied flow over rock fill embankments. Canadian Journal of Civil Engineering 21: 163-166.
Leu JM, Chan HC and Chu MS, 2008. Comparison of turbulent flow over solid and porous structures mounted on the bottom of a rectangular channel. Flow Measurement and Instrumentation 19: 1-7.
Michioku K, Maeno S, Furusawa T and Haneda M, 2005. Discharge through a permeable rubble mound weir. Journal of Hydraulic Engineering 131(1): 1-10.
Michioku K, Takehara K and Etoh T, 2007. An experimental study on flow field in and around rubble mound river structures. Journal of Hydroscience and Hydraulic Engineering 25(2): 37-45.
Mohamed H, 2010. Flow over gabion weirs. Journal of Irrigation and Drainage Engineering 136(8): 573-577.
Salmasi F, Chamani MR and Farsadizadeh D, 2012. Experimental study of energy dissipation over stepped gabion spillways with low heights. Iranian Journal of Science and Technology (IJST), Transaction B: Engineering, Civil Engineering, Shiraz university 36(C2): 253-264.
Salmasi F, Poorescandar S, Hosseinzadeh Dalir A and Farsadizadeh D, 2011. Discharge relations for rectangular broad-crested weirs. Journal of Agricultural Sciences 17: 324-336.
Sarker MA and Rhodes DG, 2004. Calculation of free-surface profile over a rectangular broad-crested weir. Flow Measurement and Instrumentation 15(4): 215-219.
 
Water and Soil Science
Volume 26, 1-2
June 2016
Pages 115-127

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