Placement of stream barb encouraged river channel flow towards bank stability


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Placement of stream barb encouraged river channel flow towards bank stability

Shaikh Abdullah Al Mamun Hossain1,2, Wang Lixue1,*, Md. Jahir Uddin3, Amimul Ahsan4,5

HIGHLIGHTS

  • River flow and bank stability were observed using iRIC-Nays2D model.
  • The model was run by setting of barbs at one bank and both bank sidewalls.
  • Scour reduced at the bank side due to sub-critical flow and induced stability.
  • Scour occurred at barb head due to hydraulic bounce with flow mixing.
  • Increased flow velocity/depth enhanced the center channel conveyance.

ABSTRACT

The study was observed placement of barbs on river channel sidewall showing river flow fortifies towards the bank stability using current flow and channel bed changes investigation solver model. The model was run by setting of barbs constructed at one bank sidewall and both bank sidewalls of the river channel. The current flow depth and discharge used were averagely 0.044 m and 0.028 m3/s. The model reproduced results on flow velocity, depth and bed elevation after placed of barbs with time. The simulation outcomes established the environs of barb stretched a significant reduction in scour alongside the river bank sidewall which persuaded sediment deposition beside increase the center channel current velocity. At the upward side of the structures, sediment bars were formed along the river bank sidewall for sub-critical flow which induced sedimentation and bank stability. Moreover, scour occurred at downward side of barb end due to hydraulic bounce and turbulence current that increased flow velocity and enhanced the river channel conveyance. Furthermore, it was observed that stream barbs placed at both bank sidewalls would be able to encourage center channel flow and persuade the bank stability.

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To cite this article: Hossain SAAM, Lixue W, Uddin MJ, Ahsan A. Placement of stream barb encouraged river channel flow towards bank stability. Journal of Advanced Civil Engineering Practice and Research 2016;3:15-22.

To link this article: http://ababilpub.com/download/jacepr3-4/