@article{fdi:010057160,
  title = {{H}ydrochemical variability at the {U}pper {P}araguay {B}asin and {P}antanal wetland},
  author = {{R}ezende, {A}. {T}. and {F}urian, {S}. and {V}ictoria, {R}. {L}. and {M}ascre, {C}. and {V}alles, {V}. and {B}arbi{\'e}ro, {L}aurent},
  editor = {},
  language = {{ENG}},
  abstract = {{C}ompartmentalization is a prerequisite to understand large wetlands that receive water from several sources. {H}owever, it faces the heterogeneity in space and time, resulting from physical, chemical and biological processes that are specific to wetlands. {T}he {P}antanal is a vast seasonally flooded continental wetland located in the centre of {S}outh {A}merica. {T}he chemical composition of the waters that supply the {P}antanal (70 rivers) has been studied in order to establish a compartmentalization of the wetland based on soil-water interactions. {A} {PCA}-based {EMMA} ({E}nd-{M}embers {M}ixing {A}nalysis) procedure shows that the chemistry of the rivers can be viewed as a mixture of 3 end-members, influenced by lithology and land use, and delimiting large regions. {A}lthough the chemical composition of the end-members changed between dry and wet seasons, their spatial distribution was maintained. {T}he results were extended to the floodplain by simple tributary mixing calculation according to the hydrographical network and to the areas of influence for each river when in overflow conditions. {T}he resulting map highlights areas of high geochemical contrast on either side of the river {C}uiaba in the north, and of the rivers {A}quidauana and {A}bobral in the south. {T}he {PCA}-based treatment on a sampling conducted in the {N}hecolandia, a large sub region of the {P}antanal, allowed the identification and ordering of the processes that control the geochemical variability of the surface waters. {D}espite an enormous variability in electrical conductivity and p{H}, all data collected were in agreement with an evaporation process of the {T}aquari {R}iver water, which supplies the region. {E}vaporation and associated saline precipitations ({M}g-calcite, {M}g-silicates {K}-silicates) explained more than 77% of the total variability in the chemistry of the regional surface water sampling.},
  keywords = {},
  booktitle = {},
  journal = {{H}ydrology and {E}arth {S}ystem {S}ciences},
  volume = {16},
  numero = {8},
  pages = {2723--2737},
  ISSN = {1027-5606},
  year = {2012},
  DOI = {10.5194/hess-16-2723-2012},
  URL = {https://www.documentation.ird.fr/hor/fdi:010057160},
}