Comparing calculated and observed vertical suspended-sediment distributions from a Hudson River Estuary turbidity maximum

P. M. Orton, G. C. Kineke

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Suspended-sediment concentrations calculated using a vertical suspended-sediment distribution equation were compared to observations from a field study of the lower turbidity maximum of the Hudson River Estuary. At four stations, an instrumented tripod measured vertical profiles of suspended-sediment concentration, current velocity, salinity and temperature through a tidal cycle. Bed and suspended-sediment samples were also analysed to determine inorganic sediment size distributions. Velocities were as high as 1·3 ms−1, with suspended-sediment concentrations up to 2000 mg 1−1. When a well-defined pycnocline existed, cross-isopycnal mixing was strongly damped (based on the gradient Richardson number). Suspended-sediment profiles were calculated with a stratification-modified Rouse equation, using (1) reference concentrations measured at 20 cm above the bed, (2) estimates of shear velocity based on the quadratic stress law, and (3) a constant sediment settling velocity of 0·22 cm s−1. Differences between mean calculated and observed total suspended load for each station were - 17, 7, 14 and 58%, respectively. An uncertainty analysis revealed that the two parameterizations most likely to account for differences of this magnitude were those used for settling velocity and stratification. Best results were found when substituting a power law relationship for settling velocity based on suspended-sediment concentration. This demonstrates the improvement which a power law formulation can provide over the commonly used constant ws parameterization in fine sediment environments.

Original languageEnglish
Pages (from-to)401-410
Number of pages10
JournalEstuarine, Coastal and Shelf Science
Volume52
Issue number3
DOIs
StatePublished - 2001

Keywords

  • Aggregation
  • Hudson River
  • Sediment transport
  • Stratification
  • Tidal estuaries
  • Turbidity maximum

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