Experimentally Mapping Water Surface Elevation, Velocity, and Pressure Fields of an Open Channel Flow Around a Stalk
Experimentally Mapping Water Surface Elevation, Velocity, and Pressure Fields of an Open Channel Flow Around a Stalk
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DOI：
10.1029/2021gl096835
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发表时间：
2022-03
影响因子：
5.2
通讯作者：
J. Moreto;W. J. Reeder;R. Budwig;D. Tonina;Xiaofeng Liu
中科院分区：
文献类型：
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作者：
J. Moreto;W. J. Reeder;R. Budwig;D. Tonina;Xiaofeng Liu
河床上速度场和压力场的定量化对于预测沉积物流动性、底栖和潜流生境质量以及潜流交换是重要的。在这里，我们报告了第一次实验研究重建的水面高程和三维时间平均的速度和压力场量化与非侵入式图像技术的三维自由表面流周围的一个几乎淹没的垂直圆柱体在一个平面床的粗颗粒泥沙在一个全尺寸水槽实验。结合折射率匹配流体的立体粒子图像测速技术在多个紧密间隔的平行和对齐平面上测量速度数据。使用旋转平行射线全方向积分法对通过平衡所有Reynolds-Averaged Navier-Stokes方程项获得的压力梯度项进行积分，重建时间平均压力场，并使用立体粒子图像测速仪进行评估。详细的压力场允许导出由圆柱体变形的水面轮廓和由圆柱体引起的潜流。
Quantification of velocity and pressure fields over streambeds is important for predicting sediment mobility, benthic and hyporheic habitat qualities, and hyporheic exchange. Here, we report the first experimental investigation of reconstructed water surface elevations and three‐dimensional time‐averaged velocity and pressure fields quantified with non‐invasive image techniques for a three‐dimensional free surface flow around a barely submerged vertical cylinder over a plane bed of coarse granular sediment in a full‐scale flume experiment. Stereo particle image velocimetry coupled with a refractive index‐matched fluid measured velocity data at multiple closely‐spaced parallel and aligned planes. The time‐averaged pressure field was reconstructed using the Rotating Parallel Ray Omni‐Directional integration method to integrate the pressure gradient terms obtained by the balance of all the Reynolds‐Averaged Navier‐Stokes equation terms, which were evaluated with stereo particle image velocimetry. The detailed pressure field allows deriving the water surface profile deformed by the cylinder and hyporheic flows induced by the cylinder.