Record Display for the EPA National Library Catalog


Main Title Approaches to Identify Exceedances of Water Quality Thresholds Associated with Ocean Conditions.
Author C. A. Brown ; W. G. Nelson
CORP Author National Health and Environmental Effects Research Lab., Corvallis, OR.
Year Published 2010
Report Number EPA/600/R-10/128
Stock Number PB2014-104526
Additional Subjects Water quality ; Water pollution abatement ; Priorities ; Water pollution control ; Water treatment ; Ocean conditions ; Estuaries ; Nitrogen ; Phosphorous ; Water temperature ; Salinity correctly
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB2014-104526 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 57p
Estuaries along the west coast of the United States periodically have high nutrient, high chlorophyll a, and low dissolved oxygen levels due to the intrusion of oceanic water into the estuaries. This oceanic water often has water quality conditions which exceed water quality standards and indicators of eutrophication status. Tools are needed to distinguish such exceedances of water quality thresholds related to import of oceanic water from other causes. In this report, we present an application of logistic regression models to predict the probability of exceedance of water quality thresholds using floodtide nutrient and dissolved oxygen data from the Yaquina Estuary. Models including water temperature and salinity correctly classified exceedances of dissolved inorganic nitrogen and phosphorous thresholds about 90% of the time, and for dissolved oxygen about 80% of the time. Inclusion of in situ fluorescence in the logistic regression model for dissolved oxygen improved the model performance and reduced the rate of false positives.