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Hydrodynamic Clarification of Rainfall-Runoff Particles

机译：降雨径流颗粒的水动力澄清

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This study examined the event-based performance of an empty-sump screenedhydrodynamic separation (HS) for particulate matter transported in rainfall-runofffrom a source area urban watershed. Fully-captured runoff events were examined andthe entire volume of runoff and particulate matter from each event was treated by theHS. The ability of the HS (in this case continuous deflective separation) to reduceparticulate matter loads in rainfall-runoff was quite variable and was largely afunction of the runoff granulometry and hydraulics. The HS was subject to highlyvariable hydraulic (flow rate) and hydrologic (duration, intensity) eventcharacteristics, and the coupled variability of granulometry. The HS was cleanedafter each event so that scour and discharge of previously captured particulate mattercould be separated from event-based discharges. Given the variable clarificationmechanisms of a HS, results demonstrated that a clean HS provided good separationcapability for the coarse sediment fraction (> 75 μm), much less separation for thesettleable fraction (25～75 μm) and low separation capacity for the suspended fraction(1～25 μm). Results consistently indicated that the mass fraction of sediment andsettleable particles also increase compared to suspended particle fraction indicating apositive relationship between particle concentration and coarser particle sizedistribution (PSD). Such coupling and generation of coarser PSDs help explain theimproved results at higher flow rates. Study results were representative of the flowand granulometry with the full cross-section of flow sampled and the entire gradationmeasured. Results indicate that the coupling of hydrology and particle transportinfluences particle size distributions (PSDs) in runoff flows. This study clearlydemonstrates that performance by the HS was predominantly influenced by influentPSD far more strongly than hydraulics. The role of scour is not reported herein.
机译：这项研究检查了空集池筛查的基于事件的性能 降雨径流中输送的颗粒物的流体动力分离（HS） 来自源地区的城市分水岭。检查了完全捕获的径流事件并 每次事件的径流和颗粒物的总量均由处理 HS。 HS（在这种情况下为连续偏转分离）减小的能力 降雨径流中的颗粒物负荷变化很大，并且在很大程度上 径流粒度仪和水力学的功能。房协受到高度重视 可变的水力（流量）和水文（持续时间，强度）事件 特性，以及粒度分析的耦合变异性。 HS已清洗 在每次事件之后，以便冲刷并排放先前捕获的颗粒物 可以与基于事件的放电分开。给出变量说明 HS的机理，结果表明，干净的HS可提供良好的分离 粗泥沙含量（> 75μm）的分离能力，分离的分离能力要差得多 沉降级分（25〜75μm），悬浮液分离能力低 （1〜25μm）。结果一致表明，沉积物的质量分数和 与悬浮颗粒分数相比，可沉降颗粒也有所增加，这表明 颗粒浓度与粗粒度之间呈正相关 分布（PSD）。这种耦合和生成较粗的PSD有助于解释 在更高的流速下获得更好的结果。研究结果代表了流程 和粒度分析，包括所采样流量的整个横截面和整个渐变 测量。结果表明，水文与颗粒运移的耦合 影响径流中的粒度分布（PSD）。这项研究显然 证明HS的性能主要受进水的影响 PSD比水力要强大得多。冲刷的作用未在本文中报道。

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