conservation has become one of the purposes in river management as well as
flood mitigation and water resources management, and understanding of river
flow and morphology in a stream with vegetation becomes important. Recently 2D
depth averaged analysis is familiar even in a stream with vegetation by taking
account of form drag due to vegetation. However, the shear stress in vegetated
area is not properly described because the resistance law due to bed roughness
is not reasonably modified in vegetated area. In this study, we discussed the
bed roughness boundary layer in flow with non-submerged vegetation to deduce a
reasonable relation between U and u* in vegetated area toward improving
the analysis of sediment transport. The results show that the modification of
resistance law using by thickness, velocity distribution in that layer was
found to bring significant improvement of accurate estimation of shear velocity
and subsequently the sediment transport. The proposed modification is improved by
2D depth averaged analysis based on this concept, and its application is
certificated through flume experiment.
Cite this paper
Jeon, H. , Obana, M. and Tsujimoto, T. (2014) Concept of Bed Roughness Boundary Layer and Its Application to Bed Load Transport in Flow with Non-Submerged Vegetation. Journal of Water Resource and Protection
, 881-887. doi: 10.4236/jwarp.2014.610082
 Tsujimoto, T. (2010) Structure and Functions of River Ecosystem—Approach from Ecohydraulics. Proceedings of 10th International Symposium on Ecohydraulics, Invited Lecture, IAHR, Seoul, CD-ROM.
 Tsujimoto, T. (1999) Flow and Fluvial Processes in Streams with Vegetation. Journal of Hydraulic Research, 37, 789-803. http://dx.doi.org/10.1080/00221689909498512
 Liu, D., Diplas, P., Fairbanks, J. and Hodges, C. (2008) An Experimental Study of Flow through Rigid Vegetation, Journal of Geophysical Research, 113, Article ID: F04015.
 Obana, M, Uchida, T. and Tsujimoto, T. (2012) Deposition of Sand and Particulate Organic Matter in Riparian Vegetation. Advances in River Engineering, JSCE, 47-52. (in Japanese)
 Ashida, K. and Michiue, M. (1972) Hydraulic Resistance of Flow in an Alluvia Bed and Bed Load Transport Rate. Proceedings of JSCE, No. 206, 59-69. (in Japanese)