Surface velocity divergence in open-channel flows with strip roughness

被引：0
|
作者：
Sanjou, M. [1 ]
Okamoto, T. [1 ]
Tanaka, Y. [1 ]
Toda, K. [1 ]
机构：
[1] Kyoto Univ, Dept Civil & Earth Resources Engn, Kyoto, Japan
来源：
RIVER FLOW 2014 | 2014年
关键词：
WATER GAS TRANSFER; TURBULENT-BOUNDARY-LAYER; MASS-TRANSFER; MOTIONS; SIMULATION;
D O I：
暂无
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The present study investigates hydrodynamic effects of the strip roughness on the Surface-velocity Divergence (SD) value to breakthrough about physical modeling of gas transfer mechanism in natural rivers. Particularly, accurate PIV measurements were conducted in a computer-controlled laboratory flume varying water discharge and roughness spacing, systematically, in order to obtain the space and time distributions of surface velocity divergence, turbulent kinetic energy and dissipation rate. Finally, a new practical model for the surface velocity divergence was proposed considering turbulence micro scales.
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页码：71 / 79
页数：9
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