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Article
Persistence of hydrologic variables and reactive stream solute concentrations in an east Tennessee watershed
Journal of Hydrology (2011)
  • Shesh R. Koirala
  • Randall W. Gentry
  • Patrick J. Mulholland
  • Edmund Perfect
  • John S. Schwartz
  • Gary S. Sayler, University of Tennessee, Knoxville
Abstract
Time and frequency domain analyses were conducted on weekly time series of water chemistry (nitrate, sulfate and calcium concentrations) collected from November 1995 to December 2005 at the West Fork of Walker Branch in Oak Ridge, Tennessee to evaluate the extent of their persistence and the relationship of this persistence to discharge and rainfall. In this study, spectral and wavelet analyses provided a theoretical basis for insights into long-term water chemistry behavior. All water chemistry parameters showed some level of persistence that was influenced by rainfall and/or discharge. Short-term persistence (less than a year) was related to the persistence of rainfall and discharge, whereas long-term persistence (more than a year) was related to the persistence of discharge. The Walker Branch conceptual hydrology model is augmented by these results that relate characteristic periodicities with flowpaths through different zones: the vadose zone (<20 week period), saturated zone (20–50 week period) and bedrock zone (>50 week period) with implications for reactive chemistries within the watershed. DOI: http://dx.doi.org/10.1016/j.jhydrol.2011.02.022
Disciplines
Publication Date
2011
Citation Information
Shesh R. Koirala, Randall W. Gentry, Patrick J. Mulholland, Edmund Perfect, et al.. "Persistence of hydrologic variables and reactive stream solute concentrations in an east Tennessee watershed" Journal of Hydrology Vol. 401 (2011)
Available at: http://works.bepress.com/gary_sayler/41/