Skip to main content
Article
Tidal Asymmetry in an Estuarine Pycnocline 2. Transport
Journal of Geophysical Research
  • David A. Jay, Portland State University
  • Cynthia N. Cudaback
Document Type
Article
Publication Date
2-1-2001
Subjects
  • Estuaries -- Hydrodynamics,
  • Columbia River (Or. And Wash.) -- Streamflow -- Mathematical models
Abstract
Flood currents in shallow estuaries are driven by an along-channel barotropic and baroclinic pressure gradient that increases monotonically toward the bottom, while friction retards near-bottom currents. Therefore, in many estuaries there is a middepth maximum in flood currents. We explore this phenomenon using a simple three-layer model in which each layer has vertically uniform currents and constant density. In this model the middle layer is of intermediate density and grows by shear-induced entrainment from the other two layers. This very simple model produces a middepth maximum in flood currents and simulates observed currents in the Columbia River entrance channel within about 10%. There is good qualitative agreement between model salinity transport and observed transport. The model pycnocline rises and falls tidally, in phase with the observed pycnocline, although pycnocline depth and thickness are better simulated using results from a two-layer model
Description

This is the publisher's final PDF. Copyright 2001 American Geophysical Union

DOI
10.1029/2000JC900151
Persistent Identifier
http://archives.pdx.edu/ds/psu/8015
Citation Information
Cudaback, C. N., and D. A. Jay (2001), Tidal asymmetry in an estuarine pycnocline 2. Transport, J. Geophys. Res., 106(C2), 2639–2652.