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Weighted Regressions on Time, Discharge, and Season (WRTDS), with an application to Chesapeake Bay River inputs

Journal of the American Water Resources Association

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Abstract

A new approach to the analysis of long-term surface water-quality data is proposed and implemented. The goal of this approach is to increase the amount of information that is extracted from the types of rich water-quality datasets that now exist. The method is formulated to allow for maximum flexibility in representations of the long-term trend, seasonal components, and discharge-related components of the behavior of the water-quality variable of interest. It is designed to provide internally consistent estimates of the actual history of concentrations and fluxes as well as histories that eliminate the influence of year-to-year variations in streamflow. The method employs the use of weighted regressions of concentrations on time, discharge, and season. Finally, the method is designed to be useful as a diagnostic tool regarding the kinds of changes that are taking place in the watershed related to point sources, groundwater sources, and surface-water nonpoint sources. The method is applied to datasets for the nine large tributaries of Chesapeake Bay from 1978 to 2008. The results show a wide range of patterns of change in total phosphorus and in dissolved nitrate plus nitrite. These results should prove useful in further examination of the causes of changes, or lack of changes, and may help inform decisions about future actions to reduce nutrient enrichment in the Chesapeake Bay and its watershed.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Weighted Regressions on Time, Discharge, and Season (WRTDS), with an application to Chesapeake Bay River inputs
Series title:
Journal of the American Water Resources Association
Volume
46
Issue:
5
Year Published:
2010
Language:
English
Publisher:
American Water Resources Association
Publisher location:
Middleburg, VA
Contributing office(s):
Branch of Regional Research-Eastern Region
Description:
24 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
857
Last page:
880
Number of Pages:
24
Time Range Start:
1978-01-01
Time Range End:
2008-12-31
Country:
United States
Other Geospatial:
Chesapeake Bay