Herzog, S.; Wondzell, S.; Ward, A. 2025. Solute dynamics in the hyporheic mesocosm in Watershed 1 at the H.J. Andrews Experimental Forest, 2019-2020 Long-Term Ecological Research Andrews Forest LTER Site. [Database]. Available: https://andrewsforest-stage.forestry.oregonstate.edu/data/fsdb-data-catalog/CF020 Accessed 2026-05-10.

We investigated biogeochemistry along a 12-m hyporheic mesocosm that allowed for controlled testing of seasonal and spatial water quality changes along a flowpath with fixed geometry and constant flow rate. Water quality profiles of oxygen, carbon, and nitrogen were measured at 1-m intervals along the mesocosm over multiple seasons. dissolved oxygen (DO) and temperature profiles were monitored on 18 dates between May 2019 through August 2020. Grab samples to monitor profiles of carbon, nitrogen, and various other solutes along the mesocosm were collected in December 2019 and August 2020 to provide more comprehensive biogeochemical analyses at time points when the dissolved oxygen (DO) and temperature profiles were at or near the maximum seasonal differences. Mesocosm monitoring ceased abruptly due to the Holiday Farm Fire, which burned from September through October 2020, cutting off personnel access and electrical power to the mesocosm facility.

Temporal coverage: 2019-05-31 to 2020-08-18

Geographic coverage: Geographic Extent: Watershed 1 (WS01) of the H.J. Andrews Experimental Forest

Spatial coverage:

Bounds: W -122.25802700, E -122.25802700, N 44.20733900, S 44.20733900

• Hyporheic exchange is critical to river corridor biogeochemistry, but decameter-scale flowpaths (~10-m long) are understudied due to logistical challenges (e.g., sampling at depth, multi-day transit times). Some studies suggest that decameter-scale flowpaths should have initial hot spots followed by transport-limited conditions, whereas others suggest steady reaction rates and secondary reactions that could make decameter-scale flowpaths important and unique. We investigated biogeochemistry along a 12-m hyporheic mesocosm that allowed for controlled testing of seasonal and spatial water quality changes along a flowpath with fixed geometry and constant flow rate. Our objective in this study was to quantify the controls on transport- vs. reaction limitation for multiple key constituents in a decameter-scale hyporheic flowpath. Specifically, we asked: (1) How variable is DO, N, and C biogeochemistry between summer and winter, given natural variation in both influent reactant loads and temperature? We expect seasonal water temperature and organic carbon availability to control aerobic respiration rates and the timing and location of oxic-anoxic transitions. (2) How variable is DO, N, and C biogeochemistry along a fixed-geometry, 12-m flowpath? We expect to identify the most rapid transformations (i.e., hot spots) of all three reactants at the upstream (or proximal end) of the flowpath, where influent concentrations are highest, compared to the downstream (or distal end) of the flowpath.

Title: Long-Term Ecological Research

• Steven M. Wondzell
  Role: Principal Investigator
  Pacific Northwest Research Station; Corvallis Forestry Sciences Lab; 3200 SW Jefferson Way, Corvallis, OR, 97331, USA
  Phone: 541-758-8753
  Email: steve.wondzell@usda.gov
  URL: https://www.fs.fed.us/pnw/lwm/aem/people/wondzell.html
• Adam S. Ward
  Role: Principal Investigator
  Dept. Head & Professor; Biological & Ecological Engineering; Oregon State University
  Email: adam.ward@oregonstate.edu
  URL: https://www.wardhydrolab.com/
• Skuyler Herzog
  Role: Creator
  Assistant Professor; Natural Resources Program; Oregon State University-Cascades
  Email: skuyler.herzog@osucascades.edu
• Steven M. Wondzell
  Role: Creator
  Pacific Northwest Research Station; Corvallis Forestry Sciences Lab; 3200 SW Jefferson Way, Corvallis, OR, 97331, USA
  Phone: 541-758-8753
  Email: steve.wondzell@usda.gov
  URL: https://www.fs.fed.us/pnw/lwm/aem/people/wondzell.html
• Adam S. Ward
  Role: Creator
  Dept. Head & Professor; Biological & Ecological Engineering; Oregon State University
  Email: adam.ward@oregonstate.edu
  URL: https://www.wardhydrolab.com/
• Roy Haggerty
  Role: Other Researcher
  Dept. of Geosciences;Wilkinson 104;Oregon State University, Corvallis, OR, 97331, USA
  Phone: 541-737-1210
  Email: haggertr@geo.oregonstate.edu
  URL: http://ceoas.oregonstate.edu/profile/haggerty/

• Information Manager
  Andrews Forest LTER Program, US Forest Service Pacific Northwest Research Station, 3200 SW Jefferson Way, Corvallis, OR, 97331
  Email: hjaweb@lists.oregonstate.edu
  URL: http://andrewsforest.oregonstate.edu/
• Skuyler Herzog
  Assistant Professor; Natural Resources Program; Oregon State University-Cascades
  Email: skuyler.herzog@osucascades.edu

• Andrews Forest LTER Site
  Role: Publisher
  Forest Ecosystems and Society Department in Forestry, Oregon State University, 201K Richardson Hall, Corvallis, OR, 97331-5752
  Phone: (541) 737-8480
  Email: lterweb@lists.oregonstate.edu
  URL: http://andrewsforest.oregonstate.edu/

We investigated biogeochemistry along a 12-m hyporheic mesocosm that allowed for controlled testing of seasonal and spatial water quality changes along a flowpath with fixed geometry and constant flow rate. Water quality profiles of oxygen, carbon, and nitrogen were measured at 1-m intervals along the mesocosm over multiple seasons. dissolved oxygen (DO) and temperature profiles were monitored on 18 dates between May 2019 through August 2020. Grab samples to monitor profiles of carbon, nitrogen, and various other solutes along the mesocosm were collected in December 2019 and August 2020 to provide more comprehensive biogeochemical analyses at time points when the dissolved oxygen (DO) and temperature profiles were at or near the maximum seasonal differences. Mesocosm monitoring ceased abruptly due to the Holiday Farm Fire, which burned from September through October 2020, cutting off personnel access and electrical power to the mesocosm facility. Hyporheic exchange is critical to river corridor biogeochemistry, but decameter-scale flowpaths (~10-m long) are understudied due to logistical challenges (e.g., sampling at depth, multi-day transit times). Some studies suggest that decameter-scale flowpaths should have initial hot spots followed by transport-limited conditions, whereas others suggest steady reaction rates and secondary reactions that could make decameter-scale flowpaths important and unique. We investigated biogeochemistry along a 12-m hyporheic mesocosm that allowed for controlled testing of seasonal and spatial water quality changes along a flowpath with fixed geometry and constant flow rate. Our objective in this study was to quantify the controls on transport- vs. reaction limitation for multiple key constituents in a decameter-scale hyporheic flowpath. Specifically, we asked: (1) How variable is DO, N, and C biogeochemistry between summer and winter, given natural variation in both influent reactant loads and temperature? We expect seasonal water temperature and organic carbon availability to control aerobic respiration rates and the timing and location of oxic-anoxic transitions. (2) How variable is DO, N, and C biogeochemistry along a fixed-geometry, 12-m flowpath? We expect to identify the most rapid transformations (i.e., hot spots) of all three reactants at the upstream (or proximal end) of the flowpath, where influent concentrations are highest, compared to the downstream (or distal end) of the flowpath. Field Methods - CF020

Purpose: Hyporheic exchange is critical to river corridor biogeochemistry, but decameter-scale flowpaths (~10-m long) are understudied due to logistical challenges (e.g., sampling at depth, multi-day transit times). Some studies suggest that decameter-scale flowpaths should have initial hot spots followed by transport-limited conditions, whereas others suggest steady reaction rates and secondary reactions that could make decameter-scale flowpaths important and unique. We investigated biogeochemistry along a 12-m hyporheic mesocosm that allowed for controlled testing of seasonal and spatial water quality changes along a flowpath with fixed geometry and constant flow rate. Our objective in this study was to quantify the controls on transport- vs. reaction limitation for multiple key constituents in a decameter-scale hyporheic flowpath. Specifically, we asked: (1) How variable is DO, N, and C biogeochemistry between summer and winter, given natural variation in both influent reactant loads and temperature? We expect seasonal water temperature and organic carbon availability to control aerobic respiration rates and the timing and location of oxic-anoxic transitions. (2) How variable is DO, N, and C biogeochemistry along a fixed-geometry, 12-m flowpath? We expect to identify the most rapid transformations (i.e., hot spots) of all three reactants at the upstream (or proximal end) of the flowpath, where influent concentrations are highest, compared to the downstream (or distal end) of the flowpath.

Method Steps

Sampling

No software entries listed in this EML file.

• LTER controlled vocabulary: hydrology (theme), biogeochemistry (theme), hyporheic (theme)

No taxonomic hierarchy listed in this EML file.

No related dataset codes found in the EML text fields.

No publication citations found in this EML file.

No related files listed in this EML file.

Data Use Agreement:

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. This Data Set is released under the Creative Commons license CC BY "Attribution" (see: https://creativecommons.org/licenses/by/4.0/). Creative Commons license CC BY - Attribution is a license that allows others to distribute, remix, tweak, and build upon your work (even commercially), as long as you are credited for the original creation. This license accommodates maximum dissemination and use of licensed materials.

It is considered professional conduct and an ethical obligation to acknowledge the work of other scientists. The Data User is asked to provide attribution of the original work if this data package is shared in whole or by individual parts or used in the derivation of other products. A recommended citation is provided for each Data Set in the Andrews LTER data catalog (see: http://andlter.forestry.oregonstate.edu/data/catalog/datacatalog.aspx). A generic citation is also provided for this Data Set on the website https://portal.edirepository.org in the summary metadata page. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed and all data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data.

General acknowledgement: Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.

License: Creative Commons Attribution 4.0 International Public License

Identifier: CC-BY-4.0

URL: https://creativecommons.org/licenses/by/4.0/

Maintenance update frequency: notPlanned

Description

• An update history is logged and maintained with each new version of every dataset.

Change History

• Version1 (2024-07-30)
  Study code and preliminary metadata established
• Version2 (2025-05-05)
  Original upload of entity 1 and 2 metadata from entity_attribute spreadsheet using move_xls programs. Ran generic QC on data and uploaded to SQL.