Volume 29, Issue 1 (Spring 2025)
jwss 2025, 29(1): 183-193 |
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Babakhah L, Khoshfetrat A, Delavari E. Experimental Investigation of Local Scour Downstream of a Type B Piano Key Weir on Sand and Gravel Bed Materials. jwss 2025; 29 (1) :183-193
URL: http://jstnar.iut.ac.ir/article-1-4462-en.html
URL: http://jstnar.iut.ac.ir/article-1-4462-en.html
Department of Civil Engineering, Faculty of Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran. , khoshfetrat@khuisf.ac.ir
Abstract: (37 Views)
Piano key weirs are a new form of labyrinth weirs and exhibit nonlinear characteristics. Due to their high efficiency regarding flow capacity, it is crucial to investigate local scour and identify solutions to mitigate it. Local scour was examined downstream of a trapezoidal piano key weir type B for the first time in this study. The weir was installed 5.50 m from the start of the channel and has a height of 0.20 m, featuring three cycles (three outlet keys, two inlet keys, and two inlet half keys). Three tailwater depths and three different flow rates were also utilized. The maximum scour depth increases with a higher densimetric Froude number and flow rate while decreasing with tailwater depth. The range of the dimensionless parameter for the densimetric Froude number in this study varies between 1 and 2. Additionally, sand and gravel were employed as two types of bed materials. As the diameter of the bed material increases, the maximum scour depth decreases. The scour index for gravel bed material is significantly lower than that for sand material, indicating that the risk of weir overturning is much lower in gravel bed material.
Type of Study: Research |
Subject:
Ggeneral
Received: 2024/12/27 | Accepted: 2025/02/24 | Published: 2025/04/30
Received: 2024/12/27 | Accepted: 2025/02/24 | Published: 2025/04/30
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