An Evaluation of Suspended Sediment Concentration on Von Karman’s Constant

Authors : Michael L. Hackett

Volume/Issue : Volume 8 - 2023, Issue 8 - August

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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.


Paper Submission Last Date
31 - December - 2023

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