Experimental Study of Variation Sediments and Effective Hydraulic Parameters on Scour Downstream of Stepped Spillway

Arman Dah-Mardeh (), Gholamreza Azizyan (), Mahmood Shafai Bejestan (), Abbas Parsaie () and Seyed Hossein Rajaei ()
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Arman Dah-Mardeh: University of Sistan and Baluchestan
Gholamreza Azizyan: University of Sistan and Baluchestan
Mahmood Shafai Bejestan: Shahid Chamran University of Ahvaz
Abbas Parsaie: Shahid Chamran University of Ahvaz
Seyed Hossein Rajaei: Researcher at Khorasan Razavi Agriculture and Natural Research and Education Center

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2023, vol. 37, issue 13, No 1, 4969-4984

Abstract: Abstract Stepped spillways are considered one of the most significant energy-dissipating structures; however, the most complicated problem that threatens the overall stability of the spillway is local scour downstream of the stepped weirs due to hydraulic jumps in the skimming flow. In this study, a series of experiments were conducted under five discharges, three tail-water depths and two sediment sizes to investigate the scour downstream of a stepped spillway to reduce scour and increase the stability of hydraulic structure. Moreover, the optimal design of parameters, including type, crest and slope of chute, step height and type of stepped spillway flow, was determined considering the economic reasons and criteria that lead to more energy dissipation. Generally, the scour dimensions decreased as the sediment size and tail-water depth increased or the particle Froude number (Frd) and critical depth reduced. With the reduction in Frd, the relative scour depth, the relative distance of maximum scour depth and the relative scour length decreased by 68.6%, 75.6% and 73.4%, respectively. Empirical equations of regression analysis were developed to estimate scour depth compared to other studies. The final equations in this study can provide good estimates of the scouring parameters downstream of the stepped weir.

Keywords: Experimental; Local scour; Stepped spillway; Hydraulic jump; Relative scour depth; Scour geometry (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11269-023-03587-w

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