Direct measurements of secondary currents at a river inflexion point
Direct measurements of secondary currents at a river inflexion point
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DOI：
10.1038/280226a0
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发表时间：
1979-07
期刊：
影响因子：
64.8
通讯作者：
C. Thorne;R. Hey
中科院分区：
文献类型：
--
作者：
C. Thorne;R. Hey
次级电流被定义为发生在与初级流局部轴垂直的平面上的电流。由于边界剪切应力的不均匀分布或横流涡度向长流方向倾斜，它们可能在管道或明渠中发展1 - 3。次级流扭曲了原始等值面和边界剪切应力的分布，对侵蚀和沉积过程有重要影响4,5。最近报道了对河湾二次流的直接测量。关于弯道之间拐点附近的范围，已经获得了进一步的数据（图1），并在这里报告。
SECONDARY currents are defined as currents which occur in a plane normal to the local axis of primary flow. They may develop in pipes or open channels as a result of non-equal distribution of boundary shear stress or by skewing of cross-stream vorticity into a long stream direction1–3. Secondary currents distort the distributions of primary isovels and boundary shear stress from those found in simple flows and have important effects on sedimentary processes of erosion and deposition4,5. Direct measurements of secondary currents in river bends were reported recently6. Further data have been obtained for the reach around the inflexion point between bends (Fig. 1) and are reported here.