Lawrence Berkeley National Laboratory
Identifying geochemical hot moments and their controls on a contaminated river floodplain system using wavelet and entropy approaches
- Author(s): Arora, B
- Dwivedi, D
- Hubbard, SS
- Steefel, CI
- Williams, KH
- et al.
Published Web Locationhttps://doi.org/10.1016/j.envsoft.2016.08.005
© 2016 Elsevier Ltd Geochemical hot moments are defined here as short periods of time that are associated with disproportionally high levels of concentrations (biogeochemically-driven or transport-related) relative to longer intervening time periods. We used entropy and wavelet techniques to identify temporal variability in geochemical constituents and their controls along three transects within a contaminated floodplain system near Rifle CO. Results indicated that transport-dominated hot moments drove overall geochemical processing in the contaminated groundwater and seep zones. These hot moments were associated with seasonal hydrologic variability (∼4 months) in the contaminated aquifer and with annual hydrologic cycle and residence times in the seep zone. Hot moments associated with a naturally reduced zone within the aquifer were found to be biogeochemically-driven, with a different dominant frequency (∼3 months) and no correlation to hydrologic or weather variations, in contrast to what is observed in other regions of the floodplain.