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Hydrology

The Channel Source Hypothesis

Researchers Steve Wondzell and Adam Ward propose the “channel-source hypothesis” in which the stream channel itself should be considered as a potential source of DOC to stream water during storms. Data collected during a small storm in the H. J. Andrews’ Watershed 1 could not be explained by existing conceptual models of stormflow generation. Simply put, DOC concentrations in the water samples collected from both the riparian and hillslope wells were lower than the concentrations in stream water so these areas could not be the primary source of DOC to the stream.

Andrews Forest Monthly Meeting May 2022

Event Date: 
Friday, May 6, 2022
Event Brief Description: 

Andrews Forest Monthly Meeting: Friday,May 6, 2022, 9-11 AM

“The shallow and deep hypothesis: linking flow paths and subsurface biogeochemical reactions” presented by Li Li, Professor, Civil and Environmental Engineering, Penn State University

“Leveraging long term stream chemistry to understand how Lookout Creek responds to climate variability” presented by Keira Johnson, M.S. Candidate, Water Resources Science, Oregon State University

After our presentations we will move into our general meeting, which includes updates on graduate student activities, site, WNF, community, education, new faces, and recent publications.

Our meetings follow the academic year. Next meeting: June 3, 2022.  9-11 AM. 

Contact Lina DiGregorio for Zoom link.

Student Spotlight - Paige Becker

News Brief Description: 

Paige Becker is a PhD Candidate in the O’Neill School of Public and Environmental Affairs at Indiana University, Bloomington, working with Adam Ward (now in Biological and Ecological Engineering at Oregon State University). Paige spent the summers of 2018, 2019, and 2021 at the Andrews Forest using salt and dyes to trace the streams of Watershed 1 with the goal of understanding flow paths and residence times within the hyporheic zone. Paige’s work will help scale reach studies to whole watersheds – using measurements from small sections of a stream inform how we understand streams at the watershed and landscape level. Paige is currently in Tennessee as a visitor at Oak Ridge National Laboratory (ORNL) as part of the Department of Energy’s Office of Science Graduate Student Research Program. At ORNL, Paige is taking her field data and findings from HJA and implementing modeling schemes developed by ORNL to continue the goal of advancing our understanding of hyporheic exchange in mountain streams.

Andrews Forest Monthly Meeting February 2022

Event Date: 
Friday, February 4, 2022
Event Brief Description: 

Andrews Forest Monthly Meeting: Friday, February 4, 2022, 9-11 AM

“The effect of climate on tree ring growth and carbon isotope variability in Douglas-fir.” presented by Dr. Karla Jarecke, Postdoctoral Scholar in College of Earth, Ocean, and Atmospheric Sciences, OSU

"Seasonal ecohydrological dynamics in Mediterranean forested ecosystems: the Re della Pietra catchment, Tuscan Apennines, Italy." presented by Dr. Daniele Penna, Professor at the Hydrology Group, Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence

Our meetings follow the academic year. Next meetings: Mar 4, April 1, May 6, June 3, 2022.  9-11 AM. 

Contact Lina DiGregorio for Zoom link.

Job opportunity geomorphology research field assistant

News Brief Description: 

Hiring: full-time field assistant for summer 2022 for fluvial geomorphology field work in Oregon and Montana. Work will include conducting field work on the floodplains of Lookout Creek in H.J. Andrews Experimental Forest, OR, and Swan River, Flathead National Forest, MT. Work may include collecting data along floodplain transects, including GPS location, notetaking, and soil cores.

Requirements:

  • Junior-level completion in a college degree in geosciences, water resources, natural resources, environmental science, hydrology, or a related field
  • Excellent notetaking skills
  • Hike 10 miles/day off trail
  • Carry loads up to 50 lbs
  • Comfort with camping and remote field locations
  • Ability to transport oneself to field locations

Desired qualifications:

  • An interest and curiosity about river science and environmental research

To Apply:
Please send a resume and cover letter detailing your interest in fluvial geomorphology research, field work experience, and backcountry skills to Emily Iskin by April 8, 2022. Please include relevant coursework with your resume. Feel free to email with any questions about the position

Snow drought reduces water transit times

A snow drought occurs when warm temperatures result in mountains receiving a higher proportion of precipitation as rain instead of snow. A new study measured the effects of the 2015 snow drought on water transit time, the time that water molecules spend moving through a basin. Dr. Catalina Segura modeled transit time in seven basins in the H.J. Andrews Experimental Forest and found that mean transit times during the 2015 drought were shorter (< 2yrs) than in 2016, 2017, or 2018.

PhD Defense: Evaluating flow dynamics in headwater tips

Event Date: 
Monday, April 5, 2021
Event Brief Description: 

Title: Dynamic Stream Permanence Estimates at Regional and Local Extents

By: Konrad Hafen

Major Professor: Paul Gessler, University of Idaho

Monday, April 5th at 1:00 PM (Pacific Daylight Time)

Contact Konrad Hafen for zoom link

Abstract:  "In the United States (US), the frequency and duration of surface water in a stream channel (i.e. stream permanence) determines if a stream is subject to regulation under the Clean Water Act. While stream permanence is important for policy implementation, quantifying streamflow and water quantity through observation and modeling has been the primary focus of water resource managers. The most comprehensive dataset of stream permanence classifications for the US is the National Hydrography Dataset (NHD), which gives classifications of perennial, intermittent, or ephemeral for most stream reaches. NHD stream permanence classifications were made during topographic map field surveys that occurred from approximately 1920-2000 and have been shown to exhibit high rates of disagreement with more recent stream permanence observations. Thus, there is currently not an available stream permanence dataset with sufficient accuracy for regulatory determinations. I present three studies to assess the influence of climate in NHD stream permanence disagreements, implement a monthly water balance model (MWBM) to create dynamic stream permanence estimates for headwater streams in the NHD network, and apply the Watershed Erosion Prediction Project (WEPP) hydrologic model to simulate stream permanence in gaged and ungauged watersheds." 

Konrad Hafen’s modeling uses data from HJ Andrews Exp Forest and other sites to evaluate flow dynamics in headwater tips of the stream network.

 

Andrews Forest Monthly Meeting April 2

Event Date: 
Friday, April 2, 2021
Event Brief Description: 

Andrews Forest Monthly Meeting: Friday, April 2, 9-11 AM

For our Winter 2021 meetings (Jan, Feb, March) we are discussing fire. The 2020 fire season will leave its mark on ecosystems of the western Cascade Mountains, inside and outside the boundaries of the H. J. Andrews Experimental Forest and LTER site. Our history of fire-related research and long-term inquiry contribute to our existing knowledge of fire in the region and provide us a unique opportunity to understand the consequences of these large fires on our complex mountain landscape. With these talks we hope to spark further discussions among the research community.

Presentations:

"Wildfire and post-fire forest management effects on water quantity and quality" presented by Kevin D. Bladon, Associate Professor, Forest Engineering, Resources, and Management, Oregon State University

“Willamette River microbes from headwaters to mouth: links to landscape, travel time, and fire" presented by Byron C. Crump, Professor, College of Earth, Ocean, and Atmospheric Sciences, Oregon State University

“Hybrid Vigor; Ecology X Art X Design" presented by David Buckley Borden, Visiting Professor, Department of Landscape Architecture, College of Design, University of Oregon.

Graduate student flash presentation: "Modeling channel change in Lower Lookout" presented by Leah Cromer, MS student with Julia Jones, Geography.
 
After our presentations, we will move into our community meeting to share about new publications, new faces, and updates from our WNF partner, graduate students, and education and outreach. 

Our meetings follow the academic year. Future meetings: May 7, June 4.  9-11 AM. 

Contact Lina DiGregorio for Zoom link.

Thesis Defense: heterotrophic carbon metabolism in the hyporheic zone

Event Date: 
Wednesday, February 3, 2021
Event Brief Description: 

"Evidence of buried particulate organic carbon as foundation for heterotrophic carbon metabolism in the hyporheic zone of a montane headwater stream in the H.J. Andrews Experimental Forest, Oregon, USA"
Satish Serchan, M.S. in Water Resources Science 
Major Professor: Dr. Steve Wondzell
Date: Wednesday, February 3, 2021.  1 PM (Pacific Time)
Location: Zoom

Contact Satish Serchan for connection details.

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