On the Characteristics of Velocities Fields in the Vicinity of Manhole Inlet Grates During Flood Events
On the Characteristics of Velocities Fields in the Vicinity of Manhole Inlet Grates During Flood Events
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DOI：
10.1029/2018wr022782
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发表时间：
2018-09
影响因子：
5.4
通讯作者：
R. Martins;M. Rubinato;G. Kesserwani;J. Leandro;S. Djordjević;J. Shucksmith
中科院分区：
文献类型：
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作者：
R. Martins;M. Rubinato;G. Kesserwani;J. Leandro;S. Djordjević;J. Shucksmith
从城市地表到下水道/雨水系统的流量的准确表征对于城市排水设计和洪水建模/风险识别非常重要。然而，几何形状的复杂性和各种各样的排水结构（连接元素），使模型校准和验证困难。在这项研究中，实验测量和数值模拟的流动特性在十个不同设计的人孔格栅附近进行了广泛的比较下，在亚临界条件下的排水流量。该工作使用2-D表面PIV（sPIV）系统首次详细描述了这些连接元件周围的速度场。此外，它首次详细验证了二维数值模型描述速度场和排水流的能力。整体比较显示数值和实验结果之间的密切关系，实验结果中的一些较高的流入量作为局部过渡的结果从堰孔条件附近的格栅的空隙区域。人们还注意到，主要由于流动方向性更强，速度差从检修孔进一步减小。总体而言，这项工作表明了进一步使用二维数值模型来描述连接元件处的流动条件的潜力，无论是直接在建模模拟中还是间接通过能量损失系数的表征。
The accurate characterization of flow from urban surfaces to sewer/stormwater systems is important for urban drainage design and flood modeling/risk identification. However, the geometrical complexity and large variety of drainage structures (linking elements) available makes model calibration and verification difficult. In this study an extensive comparison between experimentally measured and numerically modeled flow characteristics in the vicinity of ten different designs of manhole grate was performed under drainage flow in subcritical conditions. Using a 2‐D surface PIV (sPIV) system the work presents the first detailed characterization of velocity fields around these linking elements. In addition, it provides the first detailed verification of the ability of a 2‐D numerical model to describe both velocity fields and drainage flows. The overall comparison shows a close relationship between numerical and the experimental results with some higher inflows in the experimental results as a consequence of a localized transition from weir to orifice condition near the void areas of the grates. It was also noted that velocity differences decreased further from the manhole, due mainly to the more directional flow. Overall the work demonstrates the potential for further use of 2‐D numerical models to describe flow conditions at linking elements, either directly within modeling simulations or indirectly via the characterization of energy loss coefficients.