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- W2962234303 abstract "Stream water chemistry results from biochemical activity occurring in the surface, but also from processes occurringin the contributing compartments (soils, aquifers, hyporheic and riparian zones). Consequently, in-streamchemical signals contain information on circulations and reactivity in the deep compartment, which is spatiallymore integrative than information extracted from well data. Here we use data collected in first and second orderstreams over a 35 km2 agricultural catchment to infer physical and biochemical processes occurring in the aquifer.Spatially-distributed radon measurements reveal a strong heterogeneity of groundwater inputs into the streams.This high localization degree of groundwater discharge is related to large-scale topography and confirms groundwaterflow models based on well data [1]. In addition, repetition of measurements at different time periods showsa temporal heterogeneity, signed by major variations of groundwater discharge over the year, in link with watertable fluctuations.Nitrate concentrations and isotopic compositions, as well as gas data (N2, N2O, O2) inform us on biologicalreactivity. To extract information originating from the aquifer, we quantify in-stream biological activity andphysical degassing using nutrients and inert gases injections coupled with continuous in-situ measurements withmembrane inlet mass spectrometry (MIMS).This approach gives an indirect yet integrative view of the processes occurring in the aquifer. In an upscalingperspective, we aim to apply it at a regional scale." @default.
- W2962234303 created "2019-07-23" @default.
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- W2962234303 date "2018-04-08" @default.
- W2962234303 modified "2023-09-24" @default.
- W2962234303 title "Using in-stream chemical measurements to characterize groundwater circulation and biogeochemical activity in the aquifer" @default.
- W2962234303 hasPublicationYear "2018" @default.
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