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Title: Regional patterns of postwildfire streamflow response in the Western United States: The importance of scale‐specific connectivity

Journal Article · · Hydrological Processes
DOI:https://doi.org/10.1002/hyp.11208· OSTI ID:1378294
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [2]
  1. U.S. Department of Agriculture Forest Service, Southern Research Station Eastern Forest Environmental Threat Assessment Center Raleigh NC 27606 USA, U.S. Department of Energy Oak Ridge Institute for Science and Education Oak Ridge TN 37830 USA
  2. U.S. Department of Agriculture Forest Service, Southern Research Station Eastern Forest Environmental Threat Assessment Center Raleigh NC 27606 USA
  3. Department of Forest Engineering, Resources, and Management Oregon State University Corvallis OR 97331 USA
  4. U.S. Department of Agriculture Forest Service, Southern Research Station Eastern Forest Environmental Threat Assessment Center Asheville NC 28804 USA
  5. Coweeta Hydrologic Laboratory, Southern Research Station U.S. Department of Agriculture Forest Service Otto NC 28763 USA
  6. U.S. Department of Agriculture Forest Service, Southern Research Station Center for Forest Disturbance Science 320 Green Street Athens GA 30602 USA

Abstract Wildfires can impact streamflow by modifying net precipitation, infiltration, evapotranspiration, snowmelt, and hillslope run‐off pathways. Regional differences in fire trends and postwildfire streamflow responses across the conterminous United States have spurred concerns about the impact on streamflow in forests that serve as water resource areas. This is notably the case for the Western United States, where fire activity and burn severity have increased in conjunction with climate change and increased forest density due to human fire suppression. In this review, we discuss the effects of wildfire on hydrological processes with a special focus on regional differences in postwildfire streamflow responses in forests. Postwildfire peak flows and annual water yields are generally higher in regions with a Mediterranean or semi‐arid climate (Southern California and the Southwest) compared to the highlands (Rocky Mountains and the Pacific Northwest), where fire‐induced changes in hydraulic connectivity along the hillslope results in the delivery of more water, more rapidly to streams. No clear streamflow response patterns have been identified in the humid subtropical Southeastern United States, where most fires are prescribed fires with a low burn severity, and more research is needed in that region. Improved assessment of postwildfire streamflow relies on quantitative spatial knowledge of landscape variables such as prestorm soil moisture, burn severity and correlations with soil surface sealing, water repellency, and ash deposition. The latest studies furthermore emphasize that understanding the effects of hydrological processes on postwildfire dynamic hydraulic connectivity, notably at the hillslope and watershed scales, and the relationship between overlapping disturbances including those other than wildfire is necessary for the development of risk assessment tools.

Sponsoring Organization:
USDOE
OSTI ID:
1378294
Journal Information:
Hydrological Processes, Journal Name: Hydrological Processes Vol. 31 Journal Issue: 14; ISSN 0885-6087
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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