Flow resistance and its prediction methods in compound channels

Flow resistance and its prediction methods in compound channels

A series of experiments was carried out in a large symmetric compound channel composed of a rough main channel and rough floodplains to investigate the resistance characteristics of inbank and overbank flows. The effective Manning, Darcy-Weisbach, Chezy coefficients and the relative Nikuradse roughn...

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Veröffentlicht in:Acta mechanica Sinica 2007-02, Vol.23 (1), p.23-31
Hauptverfasser: Yang, Kejun, Cao, Shuyou, Liu, Xingnian
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Sprache:eng
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复合渠道
河床粗糙度
流动阻力
预测方法
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creator Yang, Kejun
Cao, Shuyou
Liu, Xingnian
description A series of experiments was carried out in a large symmetric compound channel composed of a rough main channel and rough floodplains to investigate the resistance characteristics of inbank and overbank flows. The effective Manning, Darcy-Weisbach, Chezy coefficients and the relative Nikuradse roughness height were analyzed. Many different representative methods for predicting the composite roughness were systematically summarized. Besides the measured data, a vast number of laboratory data and field data for compound channels were collected and used to check the validity of these methods for different subsection divisions including the vertical, horizontal, diagonal and bisectional divisions. The computation showed that these methods resulted in big errors in assessing the composite roughness in compound channels, and the reasons were analyzed in detail. The error magnitude is related to the subsection divisions.
doi_str_mv 10.1007/s10409-006-0043-4
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subjects 复合渠道
河床粗糙度
流动阻力
预测方法
title Flow resistance and its prediction methods in compound channels
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