The flow and transport of suspended sediment in open-channel flows over smooth-rough bed strips were simulated numerically. The flow equations were solved with the aid of the Reynolds stress model. Simulated flow structures are provided and compared with measured data available in the literature. The comparisons indicate that the numerical model successfully predicts the mean flow and turbulence statistics. The sediment distribution of suspended particles in such flows was also simulated. The transport equation for suspended sediment was solved using the eddy diffusivity concept. The computed results show that flows with higher concentration occur over the smooth strips as observed in a river flow during the floods. The eddy diffusivity profile was also obtained and compared with that from an analytical expression reported by Wang and Cheng [Advances in Water Resources. 28(2005) 441-450].
Bibliographical noteFunding Information:
A part of the present study was carried out during the first author’s sabbatical leave to Ralph M. Parsons Laboratory in MIT. The first author appreciates Dr. E. Eric Adams, Department of Civil & Environmental Engineering, MIT for his invitation. This research was partly supported by 21st Century Frontier Research Program (code No. 2-3-2 from Sustainable Water Resources Research Center) of the Ministry of Science of Technology in Korea.
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Water Science and Technology