EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Turbulence Scale in Compound Channel

Jyotirmoy Barman, Jyotismita Taye, and Bimlesh Kumar
Jyotirmoy Barman et al.
  • Indian Institute of Technology, Indian Institute of Technology Guwahati, Civil , India (

The study of turbulence in a compound channel would address the nature of sedmient transport and bank erosion activity. The study would also give insights of embankment and levee breaches at the time of high flood. Experimental investigations were conducted on two compound channels of 310 and 450 bank angle in the laboratory flume to study the turbulece scale. Velocity data were recorded with Nortek Velocimeter at seven different locations (3 locations at the upstream, 3 locations at the downstream and 1 location at the middle) of the compound channel. Turbulence scale like Taylor microscale (λT) estimates the length scale of the inertial sub- range. The Taylor scale is calculated as:

The Taylor microscale analysis showed dominance in the main channel for 450 bank angle as compared to 310 bank angle. In the location of slope midpoint and floodplain region of the compound channel, Taylor microscale was more dominant for 310 bank angle. Another important observation in both the compound channels (310 and 450 bank angle) is the dominance of Taylor microscale at the upstream section of the channel as compared to the downstream part of the channel. The results from the study would help us to get a better understanding of the role of turbulence in the morphological changes in a compound channel with different bank angles.

How to cite: Barman, J., Taye, J., and Kumar, B.: Turbulence Scale in Compound Channel, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-10900,, 2021.

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