Parameter estimation for suspended sediment transport processes under random waves

Wing Hong Onyx Wai, Yue Shan Xiong, Sean O'Neil, Keith W. Bedford

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

This paper presents a parameter estimation method for suspended sediment transport processes subject to random wave environments. An objective function was constructed based on measurements of suspended sediment concentration profiles and the governing equation of sediment transport. The Chebyshev least square method was employed to approximate the process parameters, i.e. vertical eddy diffusivity (ε) and net vertical velocity (w). The objective function of sediment transport processes with Chebyshev's parameters is well posed and does not require boundary conditions. First, second, and third order ε and w Chebyshev orthogonal functions were determined for monochromatic (MONO), narrow-banded (NBR) and broad-banded (BBR) random wave conditions. In the BBR and NBR conditions, the best fit Chebyshev approximations of ε and w were 2nd degree, while the best approximations in the MONO condition were 2nd degree for ε and 1st degree for w. The Chebyshev method provides a quick, accurate and direct estimation of two prime parameters in sediment transport dynamics.
Original languageEnglish
Pages (from-to)49-59
Number of pages11
JournalScience of the Total Environment
Volume266
Issue number1-3
DOIs
Publication statusPublished - 5 Feb 2001

Keywords

  • Chebyshev polynomials
  • Parameter estimation
  • Random waves
  • Sediment concentration profile
  • Sediment transport

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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