@article{fdi:010091429,
  title = {{I}mpact of irrigated agriculture on groundwater resources in a temperate humid region},
  author = {{T}weed, {S}arah and {C}elle-{J}eanton, {H}. and {C}abot, {L}. and {H}uneau, {F}. and {D}e {M}ontety, {V}. and {N}icolau, {N}. and {T}ravi, {Y}. and {B}abic, {M}. and {A}quilina, {L}. and {V}ergnaud-{A}yraud, {V}. and {L}eblanc, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he groundwater irrigation expansion, and its multiple potential impacts on the quantity and quality of water resources, is not just restricted to areas that are water limited. {I}n this study we present the seasonal impacts irrigation practices can have on groundwater resources in a temperate humid region, where the average annual rain/{PET} ratio is 1.0. {I}n this system the irrigation expansion is solely supported by groundwater pumping, but despite this only 5 boreholes are monitored for hydraulic head data. {I}n this study, we compensate the scarce hydrophysical dataset by incorporating environmental tracers (major ions, ?18{O}, ?2{H} and ?13{C}) and dating tracers (3{H}, {CFC}, {SF}6 and 14{C}). {R}esults indicate that at 9 of the 15 irrigation sites investigated, groundwater pumping for irrigation has induced the mixing of recent groundwater (up to < 1 year) with older waters. {T}he origin of the older waters was from either the deeper marl aquifer, or the shallow sand-clay aquifer ({SCB}) that has a 14{C} mean residence time ({MRT}) of up to 9700 years. {S}econdly, although high nitrate loads in infiltrating waters were being diverted via the artificial subsurface drainage system, increases in fertiliser loads have resulted in higher {NO}3 concentrations in younger groundwater ({NO}3: 9-45 mg/{L}, {MRT} < 20 years), compared with older groundwater ({NO}3 ? 9 mg/{L}, {MRT} > 20 years). {T}he changes in flow pathways, induced by irrigation, also results in seasonal declines in groundwater {NO}3 concentrations due to mixing with older waters. {I}n temperate humid areas, such evaluations of the seasonal evolution of water residence time, mixing process, and agrochemical contaminants are an important contribution to real water resources management in irrigated catchments.},
  keywords = {{FRANCE} ; {LOIRE}},
  booktitle = {},
  journal = {{S}cience of {T}he {T}otal {E}nvironment},
  volume = {613-614},
  numero = {},
  pages = {1302--1316},
  ISSN = {0048-9697},
  year = {2018},
  DOI = {10.1016/j.scitotenv.2017.09.156},
  URL = {https://www.documentation.ird.fr/hor/fdi:010091429},
}