Experimental Study on the Hydraulic Performance of Porous Broad-Crested Weirs with Sloping Crests

Mehrdad Doustkam (), Mostafa Rahmanshahi (), Manoochehr Fathi-Moghadam (), Alireza Keramat () and Huan-Feng Duan ()
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Mehrdad Doustkam: Shahid Chamran University of Ahvaz
Mostafa Rahmanshahi: The Hong Kong Polytechnic University
Manoochehr Fathi-Moghadam: Shahid Chamran University of Ahvaz
Alireza Keramat: The Hong Kong Polytechnic University
Huan-Feng Duan: The Hong Kong Polytechnic University

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2024, vol. 38, issue 12, No 16, 4783-4802

Abstract: Abstract Due to their superior technical and hydraulic performance and minimal environmental impact, porous weirs have emerged as a feasible alternative to traditional impermeable solid weirs in water transmission and distribution systems. This research study assesses the hydraulic performance of porous broad-crested weirs (PBCWs) with sloping crests. To accomplish this, 30 PBCW models were designed and tested under various operating conditions, including free and submerged flow scenarios. A comparative analysis was conducted to evaluate the performance of PBCWs with and without sloping crests, with the results being compared against a solid broad-crested weir (SBCW) model. The findings revealed that PBCWs with an upstream crest slope exhibited an average increase of 38% in the discharge coefficient compared to similar SBCWs. Similarly, PBCWs with a downstream crest slope demonstrated an average increase of 28% in the discharge coefficient. Additionally, PBCWs with sloping crests showcased heightened sensitivity to changes in tailwater levels compared to PBCWs with horizontal crests, with PBCWs featuring an upstream crest slope being more responsive than those with a downstream crest slope. Finally, leveraging extensive experimental data, empirical equations were derived using nonlinear multi-variable regression and gene-expression programming techniques to accurately represent the free flow discharge coefficient and submerged flow discharge reduction factor.

Keywords: Discharge coefficient; Porous weir; Broad-crested weir; Free flow; Submerged flow (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s11269-024-03887-9

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