The influence of microform bed roughness elements on flow and sediment transport in gravel bed rivers: Comment on a paper by marwan A. Hassan and ian reid

✍ Scribed by Nicholas J. Clifford; Keith S. Richards; Andre Robert

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 441 KB
• Volume: 17
• Category: Article
• ISSN: 0360-1269
• DOI: 10.1002/esp.3290170511

✦ Synopsis

Data from Turkey Brook are used to demonstrate that the interaction between gravel bedforms, flow resistance and bedload transport is a dynamic one, both between and within hydrographs, and that creation of a significant component of form drag through construction of microforms (pebble clusters) may precede the eventual break-up of the bed in a transport event. This process of 'drag augmentation', which can be seen as a feedback mechanism delaying transport and can be likened to dilation of a soil tested in a direct shear apparatus, itself appears to be dependent on the characteristics of turbulence, and therefore involves feedback at a finer resolution than envisaged by .