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Parameter estimation for suspended sediment transport processes under random waves.

O W Wai1, Y S Xiong, S O'Neil

  • 1Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon. ceonyx@polyu.edu.hk

The Science of the Total Environment
|March 22, 2001
PubMed
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This study introduces a Chebyshev least square method for estimating key parameters in suspended sediment transport under random waves. The method accurately determines vertical eddy diffusivity and net vertical velocity, crucial for sediment dynamics.

Area of Science:

  • Oceanography
  • Coastal Engineering
  • Fluid Dynamics

Background:

  • Suspended sediment transport is vital in coastal and marine environments.
  • Accurate estimation of transport parameters is essential for understanding sediment dynamics.
  • Random wave conditions present challenges for traditional parameter estimation methods.

Purpose of the Study:

  • To develop and present a novel parameter estimation method for suspended sediment transport.
  • To apply the Chebyshev least square method for approximating vertical eddy diffusivity (epsilon) and net vertical velocity (w).
  • To evaluate the method's performance under various random wave conditions (monochromatic, narrow-banded, broad-banded).

Main Methods:

  • Constructed an objective function using suspended sediment concentration profiles and the governing sediment transport equation.

Related Experiment Videos

  • Employed the Chebyshev least square method to approximate process parameters (epsilon and w).
  • Determined Chebyshev orthogonal functions of varying degrees for different wave conditions.

    • Main Results:

    • The Chebyshev method provides a well-posed objective function that does not require boundary conditions.
    • Optimal Chebyshev approximation degrees were identified: 2nd degree for both epsilon and w in broad-banded and narrow-banded conditions.
    • In monochromatic conditions, 2nd degree was optimal for epsilon and 1st degree for w.

    Conclusions:

    • The Chebyshev least square method offers a quick, accurate, and direct approach for estimating critical parameters in sediment transport.
    • This method simplifies the analysis of suspended sediment dynamics in complex wave environments.
    • The findings are applicable to coastal engineering and oceanographic research involving sediment transport.