@article{fdi:010087755,
  title = {{I}dentification of riverbank filtration sites at watershed scale : a geochemical and isotopic framework},
  author = {{L}abelle, {L}. and {B}audron, {P}aul and {B}arbecot, {F}. and {B}ichai, {F}. and {M}asse-{D}ufresne, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}dentifying groundwater wells performing riverbank filtration ({RBF}) is crucial to ensure safe drinking water through vulnerability assessment plans adapted to these hybrid water sources. {N}onetheless, {RBF} is often unintentional or insufficiently documented and official inventories are scarce. {W}e developed a user-friendly geochemical and isotopic framework for the in-situ identification of {RBF} facilities. {I}t includes an interpretation abacus for non-specialists. {W}hile most studies using tracers are site-specific and/or based on discrete samples, we propose a novel multi-site characterization where time-series of {EC}, delta 2{H} and delta 18{O} are directly used as proxies of surface water infiltration at the watershed-scale. {T}he basic statement is that time varying signal of raw water from a groundwater pumping facility reveals a significant induced infiltration of surface water. {T}he framework was applied on nearly 2000 samples from 40 pumping wells and 4 neighboring rivers (<500 m), collected through collaborative sampling on a weekly to monthly basis for 18 months. {D}espite proximity to surface water, two-third of the complete dataset (19 facilities) were revealed not to benefit from significant contribution of surface water, demonstrating location criteria to be insufficient to identify {RBF} sites. {P}ermanent {RBF} was evidenced at 5 facilities, where year-long seasonal variation of tracers in raw groundwater highlighted a continuous high proportion of infiltrated surface water. {U}nexpectedly, time-series also unveiled a third category: occasional {RBF}, where induced infiltration occurred only when specific hydrodynamic conditions were met (4 facilities). {T}his study also provided concrete illustrations on how climate change may impact the efficiency of {RBF} to naturally attenuate microbiological contaminants and how geochemical and isotopic time-series considerably help at anticipating the evolution of contaminant attenuation capacity of {RBF} sites. {F}inally, by highlighting the existence of occasional {RBF}, this study tackles the common oversimplification that groundwater facilities can be binarily and classified either as {RBF} or groundwater.},
  keywords = {{E}nvironmental tracers ; {T}ime-series ; {T}ransient riverbank filtration ; {V}ulnerability assessment ; {C}ollaborative water sampling ; {CANADA}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {864},
  numero = {},
  pages = {160964 [11 p.]},
  ISSN = {0048-9697},
  year = {2023},
  DOI = {10.1016/j.scitotenv.2022.160964},
  URL = {https://www.documentation.ird.fr/hor/fdi:010087755},
}