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首页> 外文期刊>Flow Measurement and Instrumentation >Streamwise velocity distribution in irregular shaped channels having composite bed roughness
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Streamwise velocity distribution in irregular shaped channels having composite bed roughness

机译：具有复合床粗糙度的不规则形状通道中的水流速度分布

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摘要

Applications of the proposed model by Maghrebi which is able to predict the isovel contours quantitatively in a section of an open or closed channel both with irregular shapes and roughness, have been presented [Maghrebi MF, Rahimpour M. A simple model for estimation of dimensionless isovel contours in open-channels. Flow Meas Instrum 2005;16(6):347-52]. In the present paper, the model is applied to a flume with a composite roughness as well as to rivers with irregular cross section geometries. The obtained isovel contours in a flume section with nine cases of composite roughnesses are used for discharge estimations. Then, they are compared with measured ones. Model predictions are well correlated with the measured data. The isovel contours obtained by applications of the model to river sections are used to estimate the depth-average and surface velocities. Then they are compared with the measured data at the corresponding sections. The predicted results of water surface velocities are in good agreement with the measured data in a cross section of the River Unon in Japan. The result of the depth-average velocity shows, even better agreement with the measured data as well as the best analytical results for the River Severn in the UK.
机译：提出了由Maghrebi提出的模型的应用，该模型能够定量地预测具有不规则形状和粗糙度的明渠或密闭通道截面中的等值线轮廓[Maghrebi MF，Rahimpour M.一种用于估计无量纲等值线的简单模型明渠中的轮廓。 Flow Meas Instrum 2005; 16（6）：347-52]。在本文中，该模型适用于具有复合粗糙度的水槽以及具有不规则横截面几何形状的河流。在具有9种复合粗糙度的情况下，在水槽截面中获得的等角线轮廓用于流量估算。然后，将它们与测量值进行比较。模型预测与实测数据具有很好的相关性。通过将模型应用到河段而获得的等值线轮廓用于估计深度平均和地表速度。然后将它们与相应部分的测量数据进行比较。水面速度的预测结果与日本Unon河断面的实测数据非常吻合。深度平均速度的结果显示，与测得的数据甚至与英国塞文河的最佳分析结果更好地吻合。

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