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Numerical investigation of fluid mud motion using a three-dimensional hydrodynamic and two-dimensional fluid mud coupling model

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Abstract

A water-fluid mud coupling model is developed based on the unstructured grid finite volume coastal ocean model (FVCOM) to investigate the fluid mud motion. The hydrodynamics and sediment transport of the overlying water column are solved using the original three-dimensional ocean model. A horizontal two-dimensional fluid mud model is integrated into the FVCOM model to simulate the underlying fluid mud flow. The fluid mud interacts with the water column through the sediment flux, current, and shear stress. The friction factor between the fluid mud and the bed, which is traditionally determined empirically, is derived with the assumption that the vertical distribution of shear stress below the yield surface of fluid mud is identical to that of uniform laminar flow of Newtonian fluid in the open channel. The model is validated by experimental data and reasonable agreement is found. Compared with numerical cases with fixed friction factors, the results simulated with the derived friction factor exhibit the best agreement with the experiment, which demonstrates the necessity of the derivation of the friction factor.

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Acknowledgments

The research was supported by the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120032130001), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51321065), and the National High Technology Research and Development Program of China (863 Program) (Grant No. 2012AA051709). We thank Dr. WU Yong-Sheng at the Bedford Institute of Oceanography for useful discussions.

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Authors and Affiliations

  1. Research Institute of Water Resources and Hydropower, Liaoning Province, Shenyang, 110003, Liaoning Province, China

    Xiaochen Yang

  2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China

    Qinghe Zhang

  3. Office of Liaoning Provincial Flood Control and Drought Relief Headquarters, Shenyang, 110003, China

    Linnan Hao

Authors
  1. Xiaochen Yang
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  2. Qinghe Zhang
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  3. Linnan Hao
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Corresponding author

Correspondence to Qinghe Zhang.

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Responsible Editor: Earl Hayter

This article is part of the Topical Collection on the 12th International Conference on Cohesive Sediment Transport in Gainesville, Florida, USA, 21-24 October 2013

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Yang, X., Zhang, Q. & Hao, L. Numerical investigation of fluid mud motion using a three-dimensional hydrodynamic and two-dimensional fluid mud coupling model. Ocean Dynamics 65, 449–461 (2015). https://doi.org/10.1007/s10236-015-0815-0

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  • DOI: https://doi.org/10.1007/s10236-015-0815-0

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