Next Article in Journal
Assessment of Spatio-Temporal Changes of Land Use and Land Cover over South-Western African Basins and Their Relations with Variations of Discharges
Previous Article in Journal
Short-Term Water Demand Forecasting Model Combining Variational Mode Decomposition and Extreme Learning Machine
Article Menu

Export Article

Open AccessArticle
Hydrology 2018, 5(4), 55; https://doi.org/10.3390/hydrology5040055

Transport and Fate of Nitrate in the Streambed of a Low-Gradient Stream

Department of Geography, Geology, and the Environment, Illinois State University, Normal, IL 61790, USA
*
Author to whom correspondence should be addressed.
Received: 31 August 2018 / Revised: 21 September 2018 / Accepted: 3 October 2018 / Published: 4 October 2018
  |  
PDF [2966 KB, uploaded 11 October 2018]
  |  

Abstract

The transport and fate of nitrate (NO3) to in the top 15 cm of a streambed has been well-documented, but an understanding of greater depths is limited. This work examines the transport and fate of nitrate (NO3) at depths of 30 cm, 60 cm, 90 cm, and 150 cm below the stream-streambed interface. Concentrations of nitrate as nitrogen (NO3-N) and chloride (Cl) were measured in the waters from the streambed, the stream water, and the groundwater. Mixing models predicted values of ΔNO3-N, the difference between measured NO3-N and theoretical NO3-N. At a 30-cm depth, the mean ΔNO3-N value was −0.25 mg/L, indicating a deficit of NO3-N and the removal of NO3-N from the system. At deeper levels, the values of ΔNO3-N began to approach zero, reaching a mean value of −0.07 mg/L at 150 cm. The reduction of NO3-N does not appear to be controlled by vegetation, as it was not correlated to either temperature or visible light. Larger negative ΔNO3-N values (more removal) occur when stream NO3-N concentrations are higher and organic matter is present. View Full-Text
Keywords: groundwater; mixing-model; nitrogen processing; streambed pore water; chloride groundwater; mixing-model; nitrogen processing; streambed pore water; chloride
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Peterson, E.W.; Hayden, K.M. Transport and Fate of Nitrate in the Streambed of a Low-Gradient Stream. Hydrology 2018, 5, 55.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Hydrology EISSN 2306-5338 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top