Hot Spots and Hot Moments of Nitrogen in a Riparian Corridor
Abstract
Abstract We use 3‐D high‐resolution reactive transport modeling to investigate whether the spatial distribution of organic‐carbon‐rich and chemically reduced sediments located in the riparian zone and temporal variability in groundwater flow direction impact the formation and distribution of nitrogen hot spots (regions that exhibit higher reaction rates when compared to other locations nearby) and hot moments (times that exhibit high reaction rates as compared to longer intervening time periods) within the Rifle floodplain in Colorado. Groundwater flows primarily toward the Colorado River from the floodplain but changes direction at times of high river stage. The result is that oxic river water infiltrates the Rifle floodplain during these relatively short‐term events. Simulation results indicate that episodic rainfall in the summer season leads to the formation of nitrogen hot moments associated with Colorado River rise and resulting river infiltration into the floodplain. The results further demonstrate that the naturally reduced zones (NRZs) present in sediments of the Rifle floodplain have a higher potential for nitrate removal, approximately 70% greater than non‐NRZs for typical hydrological conditions. During river water infiltration, nitrate reduction capacity remains the same within the NRZs, however, these conditions impact non‐NRZs to a greater extent (approximately 95% less nitrate removal).more »
- Authors:
-
[1];
[1];
[2];
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Geosciences Division
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Climate and Ecosystem Sciences
- Subsurface Insights, LLC, Hanover NH (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1476595
- Alternate Identifier(s):
- OSTI ID: 1417061
- Grant/Contract Number:
- AC02-05CH11231; DE‐SC0009732; DE‐AC02‐05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Water Resources Research
- Additional Journal Information:
- Journal Volume: 54; Journal Issue: 1; Journal ID: ISSN 0043-1397
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Dwivedi, Dipankar, Arora, Bhavna, Steefel, Carl I., Dafflon, Baptiste, and Versteeg, Roelof. Hot Spots and Hot Moments of Nitrogen in a Riparian Corridor. United States: N. p., 2017.
Web. doi:10.1002/2017WR022346.
Dwivedi, Dipankar, Arora, Bhavna, Steefel, Carl I., Dafflon, Baptiste, & Versteeg, Roelof. Hot Spots and Hot Moments of Nitrogen in a Riparian Corridor. United States. https://doi.org/10.1002/2017WR022346
Dwivedi, Dipankar, Arora, Bhavna, Steefel, Carl I., Dafflon, Baptiste, and Versteeg, Roelof. Thu .
"Hot Spots and Hot Moments of Nitrogen in a Riparian Corridor". United States. https://doi.org/10.1002/2017WR022346. https://www.osti.gov/servlets/purl/1476595.
@article{osti_1476595,
title = {Hot Spots and Hot Moments of Nitrogen in a Riparian Corridor},
author = {Dwivedi, Dipankar and Arora, Bhavna and Steefel, Carl I. and Dafflon, Baptiste and Versteeg, Roelof},
abstractNote = {Abstract We use 3‐D high‐resolution reactive transport modeling to investigate whether the spatial distribution of organic‐carbon‐rich and chemically reduced sediments located in the riparian zone and temporal variability in groundwater flow direction impact the formation and distribution of nitrogen hot spots (regions that exhibit higher reaction rates when compared to other locations nearby) and hot moments (times that exhibit high reaction rates as compared to longer intervening time periods) within the Rifle floodplain in Colorado. Groundwater flows primarily toward the Colorado River from the floodplain but changes direction at times of high river stage. The result is that oxic river water infiltrates the Rifle floodplain during these relatively short‐term events. Simulation results indicate that episodic rainfall in the summer season leads to the formation of nitrogen hot moments associated with Colorado River rise and resulting river infiltration into the floodplain. The results further demonstrate that the naturally reduced zones (NRZs) present in sediments of the Rifle floodplain have a higher potential for nitrate removal, approximately 70% greater than non‐NRZs for typical hydrological conditions. During river water infiltration, nitrate reduction capacity remains the same within the NRZs, however, these conditions impact non‐NRZs to a greater extent (approximately 95% less nitrate removal). Model simulations indicate chemolithoautotrophs are primarily responsible for the removal of nitrate in the Rifle floodplain. These nitrogen hot spots and hot moments are sustained by microbial respiration and the chemolithoautotrophic oxidation of reduced minerals in the riparian zone.},
doi = {10.1002/2017WR022346},
journal = {Water Resources Research},
number = 1,
volume = 54,
place = {United States},
year = {Thu Dec 28 00:00:00 EST 2017},
month = {Thu Dec 28 00:00:00 EST 2017}
}
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Figures / Tables:
Figure 1: Rifle floodplain is located in western Colorado. Previous studies have identified naturally reduced zones (NRZs; shown in orange) in the saturated alluvium using induced polarization imaging (see, Wainwright et al., 2016). NRZs are linked with elevated organic carbon, Fe(II), sulfide, and U(IV).
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