Dynamics of Gabion Weir and its comparison with Reinforced Concrete Weir

Hazrat Amin, Mujahid Khan, Muhammad Ajmal

Abstract


Weir is one of the important water divergence structure. Different types of weirs have different hydraulics on upstream as well as downstream resulting in various construction costs and necessary arrangements for safe operation.  This study presents the hydraulic comparison of two different types of weirs namely Reinforced concrete weir and Gabion weir. These weirs were compared using different hydraulic parameters like downstream scouring, upstream sedimentation, discharge coefficient, water surface profile and seepage along the weir and its foundation. Experimental analysis was carried out to estimate scouring, discharge coefficient and sedimentation. Similarly, Seepage analysis was performed using the SEEP/w software whereas water surface profile is drawn using HEC-RAS. After analyses, it is found that the upstream sedimentation and downstream scouring were maximum for concrete weir as compared to Gabion weir due to the fact that the later type is allowing some sediments to pass through its body. It is also concluded that foundation and body seepage of Gabion weir is reduced by almost 95 % when replaced with reinforced concrete weir. The HEC-RAS results showed that the water surface elevation for concrete weir is much higher than the Gabion weir. Likewise, low Discharge Coefficient was observed for concrete weir as compared to the Gabion weir. At the end it is concluded that concrete weir is more efficient in raising the water level and reducing seepage and are also durable but needs better arrangement to control scouring and sedimentation.

Keywords


Gabion weir; non-porous weir; seepage; scouring; sedimentation; flow profile; discharge coefficient.

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References


Adamski, M., Kremesec, V. & Charbeneau, R.J. (2004). Residual Saturation : What is it ? How is it Measured ? How Should We Use it? Ground Water Management - Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Assessment, and Remediation Conference, 2005: 243-256.

Azimi, A.H., Rajaratnam, N. & Zhu, D.Z. (2014). Submerged Flows over Rectangular Weirs of Finite Crest Length. Journal of Irrigation and Drainage Engineering 140:1–12.

Badr, K. & Mowla, D. (2015). Development of rectangular broad-crested weirs for flow characteristics and discharge measurement. KSCE Journal of Civil Engineering, 19:136–141.

Bohne, B., Storchenegger, I..J. & Widmoser, P. (2012). An easy to use calculation method for weir operations in controlled drainage systems. Agricultural Water Management, 109:46–53.

Boiten, W. (2002). Flow measurement structures. Flow Measurement and Instrumentation, 13:203–207.

Dabling, M.R. (2014). Nonlinear Weir Hydraulics. Master of Science Thesis, Civil and Environmental Engineering, Utah State University, Logan, Utah.

Depeweg, H., Paudel, K.P., & Mendez V, N. (2014). Transport in Irrigation Canals : A New Approach Sediment, CRC Press/Balkema, EH Leiden, The Netherlands.

Fleenor, W.E. & Jenson, M.R. (2003). Evaluation of Numerical Models...HEC-RAS and DHI-MIKE 11. Marcel-Dekker, New York, USA.

Garrote, L. & Bras, R.L. (1995). A distributed model for real-time flood forecasting using digital elevation models. Journal of Hydrology, 167:279–306.

Hashemy Shahdany, S.M., Maestre, J.M. & Van Overloop, P.J. (2015). Equitable Water Distribution in Main Irrigation Canals with Constrained Water Supply. Water Resources Management, 29:3315–3328.

Khelifa, A., Garrow, L.A., Higgins, M.J., & Meyer, M.D. (2013). Impacts of Climate Change on Scour-Vulnerable Bridges: Assessment Based on HYRISK. Journal of Infrastructure Systems, 19:138–146.

Lee, J.Y., Choi, Y.K., Kim, H.S., & Yun S.T. (2005). Hydrologic characteristics of a large rockfill dam: Implications for water leakage. Engineering Geology, 80:43–59.

Nguyen, B.T. (2006). Flow over oblique weirs. Master of Science Thesis, Section of Hydraulic Engineering Faculty of Civil Engineering and Geosciences Delft University of Technology, The Netherlands.

Rao, N.S.G. (1963). Discharge characteristics of weirs of finite-crest width. La Houille Blanche, 5:537–545.


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