Comparison of hydraulic geometry between sand‐ and gravel‐bed rivers in relation to channel pattern discrimination
Comparison of hydraulic geometry between sand‐ and gravel‐bed rivers in relation to channel pattern discrimination
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DOI：
10.1002/esp.1059
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发表时间：
2004-05
影响因子：
3.3
通讯作者：
Jiongxin Xu
中科院分区：
文献类型：
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作者：
Jiongxin Xu
根据世界各地冲积河流的数据，对砂床和砾石床河流的水力几何形状进行了比较。结果表明，具有不同河道型式的砂卵石河床河流的水力几何形状存在显著差异。在此基础上，建立了曲流河型和辫状河型的判别图解。河道宽度与流量、河道深度与流量、宽深比与流量、河道坡度与流量的关系均可用于河道形态的判别。沟道宽度和沟道深度之间的关系也可以用于沟道图案辨别。然而，这些关系的准确性为通道模式的判别不同，和深度流量关系是一个更好的模式类型比经典的斜率流量函数。这种差异的原因已定性解释。为了预测不同自然条件下河道格局的发展，应在独立或至少半独立变量的基础上搜索格局。利用水流功率与床沙粒径的关系来判别河型，比利用比降流量关系判别河型的效果更好。版权所有© 2004年约翰威利父子有限公司。
A comparison has been made between the hydraulic geometry of sand‐ and gravel‐bed rivers, based on data from alluvial rivers around the world. The results indicate a significant difference in hydraulic geometry among sand‐ and gravel‐bed rivers with different channel patterns. On this basis, some diagrams for discrimination of meandering and braided channel patterns have been established. The relationships between channel width and water discharge, between channel depth and water discharge, between width–depth ratio and water discharge and between channel slope and water discharge can all be used for channel pattern discrimination. The relationship between channel width and channel depth can also be used for channel pattern discrimination. However, the accuracy of these relationships for channel pattern discrimination varies, and the depth–discharge relationship is a better discriminator of pattern type than the classic slope–discharge function. The cause for this difference has been explained qualitatively. To predict the development of channel patterns under different natural conditions, the pattern discriminator should be searched on the basis of independent or at least semi‐independent variables. The relationship between stream power and bed material grain size can be used to discriminate channel patterns, which shows a better result than the discriminator using the slope–discharge relationship. Copyright © 2004 John Wiley & Sons, Ltd.