Checking for non-preferred file/folder path names (may take a long time depending on the number of files/folders) ...

This resource contains some files/folders that have non-preferred characters in their name. Show non-conforming files/folders.

This resource contains content types with files that need to be updated to match with metadata changes. Show content type files that need updating.

Lewis_etal_2021_Draining the landscape: How do nitrogen concentrations in riparian groundwater and stream water change following milldam removal?

Authors:
Owners:		This resource does not have an owner who is an active HydroShare user. Contact CUAHSI (help@cuahsi.org) for information on this resource.
Type:	Resource
Storage:	The size of this resource is 5.6 MB
Created:	Jul 09, 2021 at 12:34 a.m.
Last updated:	Jul 09, 2021 at 2:43 p.m.
DOI:	10.4211/hs.fe747d3511d84df7bb2856e2c7e37c27
Citation:	See how to cite this resource
Content types:	Single File Content

Sharing Status:	Published
Views:	2266
Downloads:	34
+1 Votes:	Be the first one to this.
Comments:	No comments (yet)

Abstract

Dam removals are on the increase across the US with Pennsylvania currently leading the nation. While most dam removals are driven by aquatic habitat and public safety considerations, we know little about how dam removals impact water quality and riparian zone processes. Dam removals decrease the stream base level, which results in dewatering of the riparian zone. We hypothesized that this dewatering of the riparian zone would increase nitrification and decrease denitrification, and thus result in nitrogen (N) leakage from riparian zones. This hypothesis was tested for a 1.5 m high milldam removal. Stream, soil water, and groundwater N concentrations were monitored over two years. Soil N concentrations and process rates and δ15N values were also determined. Denitrification rates and soil δ15N values in riparian sediments decreased supporting our hypothesis but no significant changes in nitrification were observed. While surficial soil water nitrate-N concentrations were high (median 4.5 mgN L-1), riparian groundwater nitrate-N values were low (median 0.09 mgN L-1), indicating that nitrate-N leakage was minimal. We attribute the low groundwater nitrate-N to denitrification losses at the lower, more dynamic, groundwater interface and/or dissimilatory nitrate reduction to ammonium (DNRA). Stream water nitrate-N concentrations were high (median 7.6 mgN L-1) and contrary to our dam-removal hypothesis displayed a watershed-wide decline that was attributed to regional hydrologic changes. This study provided important first insights on how dam removals could affect N cycle processes in riparian zones and its implications for water quality and watershed management.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:

WGS 84 EPSG:4326

Coordinate Units:

Decimal degrees

Longitude

-76.4996°

Latitude

40.0689°

Temporal

Start Date:
End Date:

Content

Learn more about the BagIt download

Select a file to see file type metadata.

Credits

Funding Agencies

This resource was created using funding from the following sources:

Agency Name	Award Title	Award Number
NSF	RAPID	1901787
NSF	Hydrologic Sciences Program	1929747

How to Cite

Lewis, E., S. Inamdar, D. Merritts, M. Peipoch, A. J. Gold, K. Addy, P. M. Groffman, J. Hripto, T. L. E. Trammell, M. Sherman, J. Kan, R. Walter, E. K. Peck (2021). Lewis_etal_2021_Draining the landscape: How do nitrogen concentrations in riparian groundwater and stream water change following milldam removal?, HydroShare, https://doi.org/10.4211/hs.fe747d3511d84df7bb2856e2c7e37c27

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

Comments

There are currently no comments