Effects of land use and sample location on nitrate-stream flow hysteresis descriptors during storm events

Journal of the American Water Resources Association
By: , and 

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Abstract

The U.S. Geological Survey's New Jersey and Iowa Water Science Centers deployed ultraviolet-visible spectrophotometric sensors at water-quality monitoring sites on the Passaic and Pompton Rivers at Two Bridges, New Jersey, on Toms River at Toms River, New Jersey, and on the North Raccoon River near Jefferson, Iowa to continuously measure in-stream nitrate plus nitrite as nitrogen (NO3 + NO2) concentrations in conjunction with continuous stream flow measurements. Statistical analysis of NO3 + NO2 vs. stream discharge during storm events found statistically significant links between land use types and sampling site with the normalized area and rotational direction of NO3 + NO2-stream discharge (N-Q) hysteresis patterns. Statistically significant relations were also found between the normalized area of a hysteresis pattern and several flow parameters as well as the normalized area adjusted for rotational direction and minimum NO3 + NO2 concentrations. The mean normalized hysteresis area for forested land use was smaller than that of urban and agricultural land uses. The hysteresis rotational direction of the agricultural land use was opposite of that of the urban and undeveloped land uses. An r2 of 0.81 for the relation between the minimum normalized NO3 + NO2 concentration during a storm vs. the normalized NO3 + NO2 concentration at peak flow suggested that dilution was the dominant process controlling NO3 + NO2 concentrations over the course of most storm events.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Effects of land use and sample location on nitrate-stream flow hysteresis descriptors during storm events
Series title Journal of the American Water Resources Association
DOI 10.1111/1752-1688.12477
Volume 52
Issue 6
Year Published 2016
Language English
Publisher American Water Resources Association
Contributing office(s) New Jersey Water Science Center
Description 16 p.
First page 1493
Last page 1508
Country United States
State Iowa, New Jersey
Other Geospatial North Raccoon River, Passaic River, Toms River