Cited by 101Soil and Water Nutrient DynamicsHydrology and Watershed Management StudiesGroundwater and Isotope Geochemistry

Fire, Flood, and Drought: Extreme Climate Events Alter Flow Paths and Stream Chemistry

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Murphy, Sheila F., McCleskey, R. Blaine, Martin, Deborah A., Writer, Jeffrey H., Ebel, Brian A.·2018·Journal of Geophysical Research: Biogeosciences

Abstract

Extreme climate events—such as hurricanes, droughts, extreme precipitation, and wildfires—have the potential to alter watershed processes and stream response. Yet due to the destructive and hazardous nature and unpredictability of such events, capturing their hydrochemical signal is challenging. A 5‐year postwildfire study of stream chemistry in the Fourmile Creek watershed, Colorado Front Range, USA, focused on high‐frequency storm sampling. During the study, the watershed was impacted by three additional extreme climate events—drought and two periods of extreme rainfall totals. These events altered concentration‐discharge relationships in ways that elucidate how hydrologic flow paths and source material availability affect stream water chemistry. Reduced infiltration after wildfire led to overland flow during thunderstorms, which conveyed ash and soil into streams. This resulted in elevated stream concentrations of constituents elevated in ash—Ca, K, Mg, alkalinity, and dissolved organic carbon—along with sediment and nitrate. Subsurface flow paths were bypassed, leading to low concentrations of Na and SiO 2, which are bedrock derived and not elevated in ash. During drought conditions, when stream discharge was <20% of average, concentrations of sediment, dissolved organic carbon, and Ca fell below average concentrations, but SiO 2 did not. Extreme rainfall totals saturated the subsurface and led to prolonged elevated stream discharge. Concentration‐discharge relationships for bedrock‐derived constituents, such as Ca and SiO 2, were altered in that time period, while those for dissolved organic carbon were not. Previous disturbances, including historical mining, also affect stream chemistry, and water‐quality impairment can be exacerbated by extreme climate events.

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Crossref · 10.1029/2017jg004349

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  • Increased overland flow and decreased infiltration are expected to reduce groundwater recharge and lead to lower baseflows.

    “Increased overland flow and decreased infiltration are expected to reduce groundwater recharge and lead to lower baseflows (Morales et al., 2013; Murphy et al., 2018; Parlak et al., 2015) and water quality models predict as much (Rodrigues et al., 2019).”

    From Wildfire Induces Changes in Receiving Waters: A Review With Considerations for Water Quality Management (2022) · cites this paper as Murphy et al., 2018

    Section 4.1.1 (page unavailable) says wildfire reduces infiltration and shifts runoff toward overland flow. The Conclusions table (page unavailable) also reports low subsurface connectivity during postwildfire thunderstorms. Neither passage establishes that this reduces groundwater recharge or leads to lower baseflows; the paper’s discussion of baseflow in Section 4.2 concerns stream chemistry instead. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Studies in more temperate, non-peatland areas away from acid deposition reported alkalinity increases, including in two streams draining burned watersheds in Colorado.

    “By contrast, studies in more temperate, non-peatland areas away from acid deposition reported alkalinity increases, including in two streams draining burned watersheds in Colorado (Murphy et al., 2018; Rhoades et al., 2011).”

    From Wildfire Induces Changes in Receiving Waters: A Review With Considerations for Water Quality Management (2022) · cites this paper as Murphy et al., 2018

    The Abstract and §3.2 report elevated alkalinity during postwildfire storms at sites downstream of the burned area in Colorado's Fourmile Creek watershed. This supports the Colorado example, but this paper studies one watershed and does not establish that it was away from acid deposition; §4.2 discusses atmospheric nitrogen deposition in the area. The sentence's second citation may account for the other stream, but this source alone does not establish it. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Wildfire often kills and partially combusts vegetation and can alter soil hydrophobicity, depending upon vegetation burned and fire severity.

    “Wildfire often kills and partially combusts vegetation and can alter soil hydrophobicity, depending upon the vegetation burned and fire severity, among other factors (Chanasyk et al., 2003; Murphy et al., 2018; Shakesby & Doerr, 2006).”

    From Wildfire Induces Changes in Receiving Waters: A Review With Considerations for Water Quality Management (2022) · cites this paper as Murphy et al., 2018

    Section 4.1.1 (Wildfire; page not provided) says wildfires kill vegetation, combust surface organic matter, and alter soil hydraulic properties, reducing infiltration. It does not specifically mention soil hydrophobicity or say that the effects depend on vegetation type or fire severity. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • In Colorado, an increase in surface flow was associated with stream calcium and potassium increases, but not sodium and silica, since they are derived more from subsurface flow paths in that system.

    “In Colorado, an increase in surface flow was associated with stream calcium and potassium increases, but not sodium and silica, since they are derived more from subsurface flow paths in that system (Murphy et al., 2018).”
  • Increases in organic carbon have been observed in temperate and boreal regions.

    “Increases in organic carbon have been observed in temperate (Emelko et al., 2011; Murphy et al., 2018; Writer et al., 2014) and boreal regions (Allen et al., 2003, 2005; Crilly et al., 2017).”

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Cites

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Research works printed but not linked: 2

  1. Murphy, S. F., McCleskey, R. B., & Writer, J. H. (2012). Effects of flow regime on stream turbidity and suspended solids after wildfire, Colorado Front Range, U.S.A. In Wildfire and water quality-Processes, impacts and challenges: International Association of Hydrological Sciences Red Book (Vol. 354, pp. 51-58). Wallingford, UK: IAHS Press.
  2. Writer, J. H., McCleskey, R. B., & Murphy, S. F. (2012). Effects of wildfire on source-water quality and aquatic ecosystems, Colorado Front Range. In Wildfire and water quality-Processes, impacts and challenges, International Association of Hydrological Sciences Red Book (Vol. 354, pp. 117-122). Wallingford, UK: IAHS Press.

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Authors
Murphy, S. F., McCleskey, R. B., Martin, D. A., Writer, J. H., & Ebel, B. A.
Affiliations
United States Geological Survey (US)
Corresponding author
Murphy, Sheila F.
Venue
Journal of Geophysical Research: Biogeosciences
Published
2018-08
Volume
123
Issue
8
Pages
2513-2526
ISSN
  • 2169-8953 (ISSN-L)
  • 2169-8961
OpenAlex
W2809896631
Cited by
101
References
74
Citations by year
2026: 11 · 2025: 25 · 2024: 17 · 2023: 19 · 2022: 14 · 2021: 6 · 2020: 6 · 2019: 1 · 2018: 2
FWCI
1.96
Type
journal article
Language
en
Open access
Locations
Journal of Geophysical Research Biogeosciences (publishedVersion, other-oa)
Funders
  • National Science Foundation (1331828)
  • U.S. Geological Survey
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
  • Physical Sciences › Environmental Science › Water Science and Technology › Hydrology and Watershed Management Studies
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Groundwater and Isotope Geochemistry
Keywords
climate extremes, forest fires, drought, extreme rainfall, stream water chemistry, concentration-discharge relationships, flow paths, surface runoff, ash transport, dissolved organic carbon, nitrate, calcium, silica, subsurface flow, water quality degradation, mining legacy

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