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On the Characteristics of Velocities Fields in the Vicinity of Manhole Inlet Grates During Flood Events

机译：洪水事件中沙井入口In附近速度场特征

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摘要

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.
机译：从城市表面到下水道/雨水系统的流量的准确表征对于城市排水设计和洪水模型/风险识别至关重要。但是，由于几何结构复杂，排水结构（连接元件）种类繁多，因此很难进行模型校准和验证。在这项研究中，在亚临界条件下的排水流量下，对十种不同设计的人孔g子附近的实验测量值和数值模型的流量特性进行了广泛的比较。使用二维表面PIV（sPIV）系统，该工作展示了围绕这些链接元素的速度场的第一个详细特征。另外，它提供了二维数值模型描述速度场和排水流的能力的首次详细验证。整体比较表明，数值与实验结果之间存在密切关系，实验结果中流入量较高，这是由于在炉排空隙附近从堰到孔条件的局部过渡所致。还应注意，速度差从人孔开始进一步减小，这主要是由于方向性更强的流动所致。总体而言，这项工作证明了进一步使用二维数值模型来描述链接元件处的流动条件的潜力，可以直接在建模模拟中或通过能量损失系数的表征间接地使用。

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