Modeling the temporal evolution of dredging-induced turbidity in the far field

Dongdong Shao, Anton Purnama, Tao Sun

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A mathematical model of the transport of dredging-induced turbidity in the far field was developed in this study. Unlike the majority of the existing models, which assume a steady state, the present model retains the transient term, ∂c/∂t, to predict the temporal evolution of the spatial extent and concentration of the sediment plume. The unknown source strength is calibrated using field data. The appropriate turbulent diffusion coefficient in the longitudinal direction, Dx, is set to comply with the real situation with negligible longitudinal diffusion. The complete transient model formulation was then used to analyze the effects of key modeling parameters, such as the water depth, h, mean tidal current velocity, u, turbulent diffusion coefficients in the longitudinal and transverse directions, Dx and Dy, as well as the sediment-settling velocity, ws, on the model prediction, in particular the approach to the steady state and the ultimate suspended sediment concentration level at the steady state. The semianalytical model thus developed with improved functionality can be used for worst-case assessments of the steady-state flow conditions in the far-field transport of the sediment plume generated by dredging operations.

Original languageEnglish
Article number04015001
JournalJournal of Waterway, Port, Coastal and Ocean Engineering
Volume141
Issue number5
DOIs
Publication statusPublished - Sep 1 2015

    Fingerprint

Keywords

  • Dredging
  • Environmental impact assessment
  • Far-field transport
  • Turbidity plume

ASJC Scopus subject areas

  • Water Science and Technology
  • Civil and Structural Engineering
  • Ocean Engineering

Cite this