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Scale-dependent temporal variations in stream water geochemistry.

Sonia A Nagorski1, Iohnnie N Moore, Temple E McKinnon

  • 1Murdock Environmental Biogeochemistry Laboratory, Department of Geology, The University of Montana, Missoula, Montana 59812, USA.

Environmental Science & Technology
|April 2, 2003
PubMed
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Short-term stream water chemistry fluctuations, like daily and bi-hourly cycles, significantly mirror long-term monthly changes. Understanding this natural variability is key for accurate environmental monitoring.

Area of Science:

  • Environmental Science
  • Geochemistry
  • Hydrology

Background:

  • Surface water geochemistry is influenced by various temporal scales, from seasonal events like snowmelt to diurnal cycles.
  • Mining impacts can alter natural geochemical processes in streams, necessitating careful study.
  • Understanding natural variability is crucial for detecting anthropogenic impacts on water quality.

Purpose of the Study:

  • To investigate surface water geochemical dynamics across monthly, daily, and bi-hourly timescales in western Montana streams.
  • To compare the geochemical variability observed at different temporal scales.
  • To assess the significance of short-term variations in relation to long-term trends.

Main Methods:

  • Conducted a year-long study of four streams in western Montana, with two impacted by mining and two pristine.

Related Experiment Videos

  • Collected surface water samples at monthly, daily, and bi-hourly intervals.
  • Analyzed key geochemical parameters including pH, dissolved oxygen, temperature, dissolved inorganic carbon, total suspended sediment, and metals.

    • Main Results:

    • Monthly geochemical changes were primarily driven by snowmelt and precipitation.
    • Daily post-rain solute and particulate surges resembled monthly spring runoff flushing.
    • Bi-hourly observations revealed diel cycling in parameters like pH, dissolved oxygen, and metals.
    • Significant overlap was found in concentration ranges across different temporal scales for many parameters.

    Conclusions:

    • Short-term (daily, bi-hourly) geochemical variations can represent a substantial portion of long-term (monthly) variability.
    • Nesting short-term studies within long-term designs is essential to differentiate environmental change signals from natural variability.
    • This approach improves the accuracy of water quality monitoring and impact assessment.