OLS : Record

RECORD NUMBER: 21 OF 1153

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
Subjects Water quality; Water pollution abatement; Priorities; Water pollution control; Water treatment; Ocean conditions; Estuaries; Nitrogen; Phosphorous; Water temperature; Salinity correctly
Holdings
Library   Call Number Additional Info Location Date Modified
NTIS PB2014-104526 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 07/30/2014
Collation 57p
Abstract 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.
Availability Notes Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA.
PUB Date Free Form Sep 2010
Category Codes 68D; 48G; 43F; 47; 91A
NTIS Prices PC A05
Document Type NT
Control Number 111203200
Cataloging Source NTIS/MT
Origin NTIS
Type CAT