Numerical investigation of hydraulic jumps with USBR and wedge-shaped baffle block basins for lower tailwater

IF 2.1 4区环境科学与生态学 Q2 ENGINEERING, CIVIL

AQUA-Water Infrastructure Ecosystems and Society Pub Date : 2023-10-17 DOI:10.2166/aqua.2023.261

Muhammad Waqas Zaffar, Ishtiaq Hassan, Zulfiqar Ali, Kaleem Sarwar, Muhammad Hassan, Muhammad Taimoor Mustafa, Faizan Ahmed Waris

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Abstract

Abstract The stilling basin of the Taunsa barrage is a modified form of the United States Bureau of Reclamation (USBR) Type-III basin, which consists of baffle and friction blocks. Studies revealed uprooting of baffle blocks due to their vertical face. Additionally, the literature highlighted issues of rectangular face baffle blocks: less drag, smaller wake area, and flow reattachment. In contrast, the use of wedge-shaped baffle blocks (WSBBs) is limited downstream of open-channel flows. Therefore, this study developed numerical models to investigate the effects of USBR and WSBB basins on the hydraulic jump (HJ) downstream of the Taunsa barrage under lower tailwater conditions. Surface profiles in WSBB and modified USBR basins showed agreement with previous studies, for which the coefficient of determination (R2) reached 0.980 and 0.970, respectively. The HJ efficiencies reached 57.9 and 58.6% in WSBB and modified USBR basins, respectively. The results of sequent depths, roller length, and velocity profiles in the WSBB basin were found more promising than the modified USBR basin, which further confirmed the suitability of the WSBB basin for barrages. Furthermore, WSBB improved flow behaviors in the basin, which showed no fluid reattachment on the sides of WSBB, increased wake regions, and decreased turbulent kinetic energies.

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下部尾水楔形挡板池与USBR水跃的数值研究

摘要:陶沙拦河坝的止水盆地是美国垦务局(USBR) iii型盆地的改进形式，由挡流板和摩擦块组成。研究表明，由于挡板的垂直表面，它们会被连根拔起。此外，文献强调了矩形面挡板块的问题:更小的阻力，更小的尾迹面积，和流动再附着。相反，楔形挡流块(WSBBs)的使用在明渠下游受到限制。因此，本研究建立了低尾水条件下USBR和WSBB流域对Taunsa拦河坝下游水力跃变(HJ)影响的数值模型。WSBB和改良USBR盆地的地表剖面与前人研究结果一致，决定系数(R2)分别达到0.980和0.970。在WSBB和改性USBR盆地中，HJ效率分别达到57.9%和58.6%。与改良USBR盆地相比，WSBB盆地的序层深度、滚轮长度和速度剖面结果更有前景，进一步证实了WSBB盆地适合坝体发育。此外，WSBB改善了盆地内的流动行为，在WSBB两侧没有流体再附着，增加了尾迹区域，降低了湍流动能。

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