Downstream Regime Relations for Single-Thread Channels

作者：Thayer J B^*

来源：River Research and Applications, 2017, 33(1): 182-186.

DOI：10.1002/rra.3053

• regime relations
• downstream hydraulic geometry
• single-thread channels
• gravel-bed channels
• sand-bed channels

New empirically derived downstream hydraulic geometry relations are developed for single-thread gravel/cobble-bed and sand-bed channels using the independent variables bankfull discharge, channel slope, and median bed grain size. Differences in channel response to the controlling variables are observed between gravel/cobble-bed and sand-bed channels. It is found that the inclusion of channel slope into regime relations is necessary for accurate channel geometry predictions and that bed grain size becomes an unnecessary variable. Accuracy of predictions is superior to many existing relations and comparable with those that already include slope as an independent variable. Variability of prediction errors is comparable with existing relations. Applications and implications of the new relations are discussed.

• 出版日期2017-1