| ON THE INFLUENCE OF TURBULENCE ON THE INITIATION OF SEDIMENT MOTION |
| |
| 作者姓名： | U.C.E. ZANKE |
| |
| 作者单位： | Institute of |
| |
| 摘 要： | 1 PROBLEM DEFINITION Owing to the practical importance of the initiation of motion many researchers began to tackle this problem even at the beginning of the last century (e.g. Kramer (1932, 1935), Casey (1935)). Shields (1936, Fig. 1) developed a non-dimensional representation based on the measured data of Casey, Kramer, USWES and Gilbert, together with his own data based on investigations with succinite sand, lignite, granite chips and heavy spar. Despite the different material p…
|
ON THE INFLUENCE OF TURBULENCE ON THE INITIATION OF SEDIMENT MOTION |
| |
| U.C.E. ZANKE.ON THE INFLUENCE OF TURBULENCE ON THE INITIATION OF SEDIMENT MOTION[J].International Journal of Sediment Research,2003,18(1). |
| |
| Authors: | UCEZANKE |
| |
| Institution: | U.C.E. ZANKE1 |
| |
| Abstract: | For the initiation of sediment motion a theory is developed, which presupposes that the critical shear stress tc responsible for inducing motion in non-turbulent flow is solely defined by the angle of internal friction f or the angle of repose f' of single grains. In turbulent flow, fluctuations t' in the shear stress as well as lift forces produced by these fluctuations also occur. Owing to this, the actual (effective) critical shear stress t + t' acting on a grain is larger than the average stress t on the one hand, and on the other hand, the effective weight of the grains is reduced: they become effectively lighter. On the basis of the presented analytical formulation the initiation of sediment motion may be described solely by the angle of repose of the grains and turbulence parameters. |
| |
| Keywords: | Critical shear stress Angle of repose Initiation of sediment motion Turbulence parameter |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
