IAHR Document Library

« Back to Library Homepage « Journal of Hydraulic Research 2020 Issue 4

Layer-averaged numerical study on effect of Reynolds number on turbidity currents

Author(s): Peng Hu; Junyu Tao; Wei Li; Zhiguo He

Linked Author(s): Zhiguo He

Keywords: Current front position; Direct numerical simulation; Layer-averaged modelling; Reynolds number; Turbidity currents

Abstract: Direct numerical simulations of lock-exchange turbidity currents with small Reynolds number were often assumed to well represent turbidity currents with large Reynolds number. Here, this assumption is examined using a layer-averaged numerical model. It is shown that in the initial stage the current front position converges if the Reynolds number approaches certain threshold values. However, at later stages, turbidity currents with larger Reynolds number propagate faster and farther. This is because, by definition, a larger Reynolds number corresponds to more sediment mass carried by the current, and thus higher driving force. Furthermore, turbidity currents with the same Reynolds number can correspond to very different front positions and deposition profiles, as the Reynolds number depends on both current thickness and concentration.


Year: 2020

Copyright © 2024 International Association for Hydro-Environment Engineering and Research. All rights reserved. | Terms and Conditions