Flow resistance in the coastal zone |
| |
| Authors: | K T Houwman L C Van Rijn |
| |
| Institution: | a Institute for Marine and Atmospheric Research Utrecht, Department of Physical Geography, Utrecht University, P.O. Box 80.115, 3508 TC Utrecht, Netherlands;b Delft Hydraulics, Delft, Netherlands |
| |
| Abstract: | The apparent bed roughness, the roughness value experienced by a mean flow outside the wave-boundary layer, is deduced from the physical bed roughness and the wave–current interaction mechanism. Both the physical bed roughness and the wave–current interaction are described by a (combination of) model(s). Modelling of the apparent bed roughness leads to realistic results, however, the final results are rather sensitive to the particular choice of these models. Four bed form models and two wave–current interaction models were implemented in a 1-DV flow model to calculate near-bed velocities. A comparison between measured and predicted velocities shows that reasonable results can be obtained in this way. A constant bed roughness of 0.1 m, however, leads to even better results at this site during all conditions. This can be explained by the reversed influence of the form roughness and the wave–current interaction on the apparent bed roughness value for varying wave conditions. |
| |
| Keywords: | Bed roughness Bed forms Wave– current interaction Flow model Tidal flow |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
