@article{fdi:010088437,
  title = {{G}roundwater discharge to coastal streams-a significant pathway for nitrogen inputs to a hypertrophic {M}editerranean coastal lagoon},
  author = {{D}avid, {M}. and {B}ailly-{C}omte, {V}. and {M}unaron, {D}. and {F}iandrino, {A}. and {S}tieglitz, {T}homas},
  editor = {},
  language = {{ENG}},
  abstract = {{N}ear-shore and direct groundwater inputs are frequently omitted from nutrient budgets of coastal lagoons. {T}his study investigated groundwater-driven dissolved inorganic nitrogen ({DIN}) inputs from an alluvial aquifer to the hypertrophic {O}r lagoon, with a focus on the {S}alaison {R}iver. {P}iezometric contours revealed that the {S}alaison hydrogeological catchment is 42% bigger than the surface watershed and hydraulic gradients suggest significant groundwater discharge all along the stream. {H}ydrograph separation of the water flow at a gauging station located 3 km upstream from the {O}r lagoon combined with {DIN} historical data enabled to estimate that groundwater-driven {DIN} inputs account for 81-87% of the annual total {DIN} inputs to the stream upstream from the gauging station. {A} radon mass balance was performed for the hydrological cycle 2017-2018 to estimate groundwater inflow into the downstream part of the stream. {R}esults showed that (1) {DIN} fluxes increased by a factor 1.1 to 2.3 between the gauging station and the {S}alaison outlet. (2) the increase in {DIN} was due to two groundwater-fed canals and to groundwater discharge along the stream, the latter represented 63-78% of the water flow. {T}his study thus highlights the significance of groundwater driven {DIN} inputs into the {S}alaison {R}iver, which account for 90% of the annual {DIN} inputs. {T}his is particularly true in the downstream part of the river, which, on averages, supplies 48% of total {DIN} inputs to the river. {T}hese downstream {DIN} inputs into the {O}r lagoon were previously not taken into account in the management of this and other {M}editerranean lagoons. {T}he inputs will probably affect restoration processes for many years due to their residence time in the aquifer. {T}his study throws light on a rarely documented source of 'very-nearshore' groundwater discharge to coastal streams in water and nutrient budgets of coastal zone ecosystems.},
  keywords = {{FRANCE} ; {OR} {LAGUNE}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {677},
  numero = {},
  pages = {142--155},
  ISSN = {0048-9697},
  year = {2019},
  DOI = {10.1016/j.scitotenv.2019.04.233},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088437},
}