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首页> 外文会议>Conference on Fluvial Hydraulics >Near-bed flow over a fixed gravel bed
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Near-bed flow over a fixed gravel bed

机译：近床流过固定砾石床

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Advances in measurement technologies allow more detailed studies of near-bed flow fields over rough surfaces. Flow measurements over a gravel-bed mold are undertaken at the Fluid Mechanics Laboratory of the University of Auckland. The flume in use is 0,45-m wide and 19-m long. Nortek's Vectrino II profiler is used to measure the flow. Flow data are obtained over a region of interest of 0.150-m length and 0.102-m width, over which 425 samples are obtained (Figure 1). Upstream and downstream of the region of interest, the fixed gravel bed is extended, to reduce any disturbance of the approaching uniform flow. The flow measurements cover both, the interfacial region between gravel-bed elevation troughs and crests, as well as the region beyond the roughness elements. The individual time series' are post-processed and average flow velocity components are obtained. To showcase the potential of the applied procedure, vertical slices (Figure 2) and a horizontal layer of near-bed flow fields are presented. It is shown that near-bed flow fields strongly interact with the gravel bed, as we already now.
机译：测量技术的进步允许在粗糙表面上更详细地研究近床流量。在奥克兰大学的流体力学实验室开展了碎石床模具上的流量测量。使用的水槽宽度为0.45米，长度为19米。 Nortek的Vectrio II Profiler用于测量流量。流量数据在0.150-m长度和0.102-m宽度的情况下获得，获得425个样本（图1）。在感兴趣区域的上游和下游，固定砾石床延伸，以减少接近均匀流动的任何干扰。流量测量覆盖覆盖砾石床升高槽和冠之间的界面区域，以及超出粗糙度元件的区域。各个时间序列'是处理后的，并且获得了平均流速分量。为了展示所施加的程序的电位，呈现垂直切片（图2）和近床流场的水平层。结果表明，近床流场与砾石床相互作用，如今。

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