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When Do Riverine Systems “Feel the Burn”? Simulating How Burn Extent and Severity Modulate Hydrologic Controls on Biogeochemical Export

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1029/2025WR040678· OSTI ID:3022008
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Pacific Northwest National Laboratory (PNNL), Sequim, WA (United States); Oregon State Univ., Corvallis, OR (United States)
  2. Pacific Northwest National Laboratory (PNNL), Sequim, WA (United States); Univ. of Toledo, OH (United States)
  3. Oregon State Univ., Corvallis, OR (United States); Washington State Univ., Pullman, WA (United States)
  4. Pacific Northwest National Laboratory (PNNL), Sequim, WA (United States)
  5. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  6. Oregon State Univ., Corvallis, OR (United States)
Wildfires impact terrestrial landscapes and downstream river corridors through shifts in vegetation and soil properties leading to downstream hydrologic and water quality impacts. The magnitude of these impacts depend on a complex and interconnected set of wildfire, landscape, and aquatic processes. Here, we isolate the impact of post-fire hydrologic changes on streamflow, nitrate, and dissolved organic carbon using the Soil and Water Assessment Tool (SWAT) model. We explore how responses differ across burn severity and area burned in two test basins: a humid forested basin and a semi-arid mixed land use basin. We ran 1830 wildfire simulations testing impacts of area burned, burn severity, and post-fire precipitation on streamflow, nitrate, and dissolved organic carbon. Our work suggests that area burned thresholds differ with burn severity and analyte. Additionally, post-fire transport of dissolved organic carbon was sensitive to both area burned and severity, while nitrate was primarily sensitive to area burned. Despite a muted (−9.5 to 5.7 mm yr−1 change) hydrologic response in the semi-arid basin, the model predicted large (7%–288% increase) shifts in dissolved organic carbon, suggesting that post-fire shifts in flow pathways and soil properties are key in its response. The limited shifts in nitrate responses in the simulations highlight that terrestrial post-fire transformations, rather than hydrologic changes, may control the increases in stream nitrate often observed post-fire. As wildfire regimes are shifting, improving understanding of post-fire nutrient export responses is critical to protect freshwater resources and aquatic ecosystems.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Earth & Environmental Systems Science (EESS); United States Forest Service (USFS)
Grant/Contract Number:
AC05-76RL01830
Other Award/Contract Number:
54737
22‐JV‐11261952‐071
23-JV-11261954-057
OSTI ID:
3022008
Report Number(s):
PNNL-SA--209947
Journal Information:
Water Resources Research, Journal Name: Water Resources Research Journal Issue: 2 Vol. 62; ISSN 0043-1397; ISSN 1944-7973
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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