Statistical mapping of zones of focused groundwater/surface-water exchange using fiber-optic distributed temperature sensing

Kisa Mwakanyamale, Frederick D. Day-Lewis, Lee Slater

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Fiber-optic distributed temperature sensing (FO-DTS) increasingly is used to map zones of focused groundwater/surface-water exchange (GWSWE). Previous studies of GWSWE using FO-DTS involved identification of zones of focused GWSWE based on arbitrary cutoffs of FO-DTS time-series statistics (e.g., variance, cross-correlation between temperature and stage, or spectral power). New approaches are needed to extract more quantitative information from large, complex FO-DTS data sets while concurrently providing an assessment of uncertainty associated with mapping zones of focused GSWSE. Toward this end, we present a strategy combining discriminant analysis (DA) and spectral analysis (SA). We demonstrate the approach using field experimental data from a reach of the Columbia River adjacent to the Hanford 300 Area site. Results of the combined SA/DA approach are shown to be superior to previous results from qualitative interpretation of FO-DTS spectra alone. Key Points Uncertainty is assigned in mapping groundwater exchange zones Multiple frequencies is more informative in discriminant analysis Spectral signatures of mapped zones can be identified with space limited data

Original languageEnglish (US)
Pages (from-to)6979-6984
Number of pages6
JournalWater Resources Research
Volume49
Issue number10
DOIs
StatePublished - Oct 1 2013

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

Keywords

  • discriminant analysis
  • groundwater-surface water exchange
  • spectral analysis

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