Modeling coliform-bacteria concentrations and pH in the salt-wedge reach of the Duwamish River Estuary, King County, Washington
Open-File Report
76-415
By: W.L. Haushild and Edmund A. Prych
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Abstract
Total- and fecal-coliform bacteria, plus pH, alkalinity, and dissolved inorganic carbon are water-quality parameters that have been added to an existing numerical model of water quality in the salt-wedge reach of the Duwamish River estuary in Washington. The coliform bacteria are modeled using a first-order decay (death) rate, which is a function of the local salinity, temperature, and daily solar radiation. The pH is computed by solving a set of chemical-equilibrium equations for carbonate-bicarbonate buffered aqueous solutions. Concentrations of total- and fecal-coliform bacteria computed by the model for the Duwamish River estuary during June-September 1971 generally agreed with observed concentrations within about 40 and 60 percent, respectively. The computed pH generally agreed with observed pH within about a 0.2 pH unit; however, for one 3-week period the computed pH was about a 0.4 unit lower than the observed pH. (Woodard-USGS)
Suggested Citation
Haushild, W., and Prych, E.A., 1976, Modeling coliform-bacteria concentrations and pH in the salt-wedge reach of the Duwamish River Estuary, King County, Washington: U.S. Geological Survey Open-File Report 76-415, ix, 43 p. :ill., map ;28 cm., https://doi.org/10.3133/ofr76415.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Modeling coliform-bacteria concentrations and pH in the salt-wedge reach of the Duwamish River Estuary, King County, Washington |
| Series title | Open-File Report |
| Series number | 76-415 |
| DOI | 10.3133/ofr76415 |
| Year Published | 1976 |
| Language | ENGLISH |
| Publisher | U.S. Geological Survey, |
| Description | ix, 43 p. :ill., map ;28 cm. |