A 型钢琴键堰的流场和泥沙通过能力

IF 3.5 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
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引用次数: 0

摘要

在当今时代,水力结构附近的沉积和河床形态是一个非常值得关注的问题,因为它会影响水流结构并降低排泄能力。为了监测堰塞湖的泥沙通过能力,我们进行了实验研究,研究了带鼻孔的单循环、双循环和三循环琴键堰(PK 堰)附近的流场。使用声学多普勒流速仪(ADV)测量了进水口和出水口附近的三维(3D)流速。对进水口和出水口附近的速度场进行了检查,发现垂直(-分量)和横向(-分量)速度都有显著增加。此外,还发现出口键前的平均垂直速度比入口键前大,而平均横向和纵向速度较低。在进水口关键点前方观察到的流速最大,这导致 PK 堰上的泥沙运动增加。此外,2.6%-5.2% 的沉积物通过堰体上游部分的自净作用冲过进水键。可能由于流场的复杂性,使用 ADV 无法准确估算堰塞湖上的流场,因此使用计算成本和空间较小的 CFD 求解器进行了计算流体动力学(CFD)模拟,以了解所有三个 PK 堰塞湖的复杂流场。目前的数值研究采用了广泛使用的标准湍流模型(涡粘模型)。数值研究结果表明,由于 PK 堰下游的流量非常大,坡键前的垂直收缩导致速度分量增大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flow field and sediment passing capacity of type-a piano key weirs

In the present era, sedimentation and bed morphology near hydraulic structures is a great concern as it affects the flow configuration and reduces the discharge capacity. Experimental investigations were done to study the flow field in the vicinity of one cycle, two cycle, and three cycle piano key weirs (PK weirs) with noses to monitor the sediment passing capacity of the weir. The three dimensional (3D) velocities were measured close to the inlet and outlet keys using an acoustic Doppler velocimeter (ADV). The velocity fields near both the inlet and outlet keys were examined, and it was found that there were considerable increases in the vertical (v-component) and lateral (w-component) velocities. Added to this, it was seen that the mean vertical velocity was more in front of the outlet key as compared to the front of the inlet key while the mean lateral and longitudinal velocities were low. The maximum velocity was observed in front of the inlet key which resulted in an increase of sediment movement over the PK weir. Furthermore, 2.6%–5.2% of the total sediment passing over the upstream portion of the weirs are flushed over the inlet key by self-cleaning. The flow field over the keys could not be accurately estimated using an ADV, possibly due to the flow complexity so computational fluid dynamics (CFD) simulations were done to understand the complex flow field for all the three PK weirs using a CFD solver which needs less computational cost and space. The widely used standard kε turbulence model (an eddy-viscosity model) was applied in the current numerical investigations. The numerical investigation shows that the magnitude of the velocity components was increased because of the vertical contraction in front of the sloped keys owing to very high flow immediately downstream of PK weirs.

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来源期刊
International Journal of Sediment Research
International Journal of Sediment Research 环境科学-环境科学
CiteScore
6.90
自引率
5.60%
发文量
88
审稿时长
74 days
期刊介绍: International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.
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