Authors :
Michael L. Hackett
Volume/Issue :
Volume 8 - 2023, Issue 8 - August
Google Scholar :
https://bit.ly/3TmGbDi
Scribd :
https://tinyurl.com/y3wt6yxx
DOI :
https://doi.org/10.5281/zenodo.8347906
Abstract :
This paper investigates the relationship
between flow velocity, flow height, and von Karman’s
constant, , in a marine environment. It is based on
empirical measurements obtained in Western Solent,
Southampton, UK. The velocity gradient is explored to
understand its relation to bed shear stress and the
formation of the benthic boundary in the water column.
The paper explores von Karman’s constant as a
parameter that characterises the rough-turbulent regime,
where shear stress is proportional to the square of the flow
velocity. It evaluates for the study area and explores
whether remains constant or varies with suspended
sediment concentration.
Results show that the calculated friction velocity and
are within the expected range, supporting the validity of
the Reynolds stress method. The average value of
obtained is 0.442, slightly higher than the generally
accepted value. However, the correlation between and
suspended sediment concentration is inconclusive,
indicating the need for further research.
This paper provides some insights into the dynamics
of turbulent flow in a marine environment and sheds some
light on the nature of von Karman’s constant,
emphasising the importance of suspended sediment
concentration in understanding flow behaviour near the
bed.
Keywords :
Acoustic Doppler Current Profiler (ACDP), Autonomous Benthic Recorder (ABR), bed shear stress, benthic boundary, Electromagnet Current Meter (EMCM), friction velocity, Optical Backscatter Sensor (OBS), suspended sediment concentration (SSC), turbidity, Valeport.
This paper investigates the relationship
between flow velocity, flow height, and von Karman’s
constant, , in a marine environment. It is based on
empirical measurements obtained in Western Solent,
Southampton, UK. The velocity gradient is explored to
understand its relation to bed shear stress and the
formation of the benthic boundary in the water column.
The paper explores von Karman’s constant as a
parameter that characterises the rough-turbulent regime,
where shear stress is proportional to the square of the flow
velocity. It evaluates for the study area and explores
whether remains constant or varies with suspended
sediment concentration.
Results show that the calculated friction velocity and
are within the expected range, supporting the validity of
the Reynolds stress method. The average value of
obtained is 0.442, slightly higher than the generally
accepted value. However, the correlation between and
suspended sediment concentration is inconclusive,
indicating the need for further research.
This paper provides some insights into the dynamics
of turbulent flow in a marine environment and sheds some
light on the nature of von Karman’s constant,
emphasising the importance of suspended sediment
concentration in understanding flow behaviour near the
bed.
Keywords :
Acoustic Doppler Current Profiler (ACDP), Autonomous Benthic Recorder (ABR), bed shear stress, benthic boundary, Electromagnet Current Meter (EMCM), friction velocity, Optical Backscatter Sensor (OBS), suspended sediment concentration (SSC), turbidity, Valeport.
