Hydrochemical variability at the Upper Paraguay Basin and Pantanal wetland

Autor(es)

Rezende Filho, A. T. ^[1] ; Furian, S. ^[2] ; Victoria, R. L. ^[3] ; Mascre, C. ; Valles, V. ^[4] ; Barbiero, L. ^{[3, 5]}

Afiliação do(s) autor(es)

^[1] Univ Fed Mato Grosso do Sul, Dept Geog, BR-79750000 Nova Andradina, MS - Brazil

^[2] Univ Sao Paulo, Lab Pedol, Dept Geog, BR-05508900 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Ctr Energia Nucl Agr, Lab Anal Ambiental Geoproc, BR-13416000 Piracicaba, SP - Brazil

^[4] Univ Avignon & Pays Vaucluse, Lab Hydrogeol, F-84029 Avignon 01 - France

^[5] Univ Toulouse 3, Inst Rech Dev, Observ Midi Pyrenees, F-31400 Toulouse - France

• Tipo de documento: Artigo Científico
• Fonte: HYDROLOGY AND EARTH SYSTEM SCIENCES; v. 16, n. 8, p. 2723-2737, 2012.
• Citações Web of Science: 12

Resumo

Compartmentalization is a prerequisite to understand large wetlands that receive water from several sources. However, it faces the heterogeneity in space and time, resulting from physical, chemical and biological processes that are specific to wetlands. The Pantanal is a vast seasonally flooded continental wetland located in the centre of South America. The chemical composition of the waters that supply the Pantanal (70 rivers) has been studied in order to establish a compartmentalization of the wetland based on soil-water interactions. A PCA-based EMMA (End-Members Mixing Analysis) 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. Although the chemical composition of the end-members changed between dry and wet seasons, their spatial distribution was maintained. The 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. The resulting map highlights areas of high geochemical contrast on either side of the river Cuiaba in the north, and of the rivers Aquidauana and Abobral in the south. The PCA-based treatment on a sampling conducted in the Nhecolandia, a large sub region of the Pantanal, allowed the identification and ordering of the processes that control the geochemical variability of the surface waters. Despite an enormous variability in electrical conductivity and pH, all data collected were in agreement with an evaporation process of the Taquari River water, which supplies the region. Evaporation and associated saline precipitations (Mg-calcite, Mg-silicates K-silicates) explained more than 77% of the total variability in the chemistry of the regional surface water sampling. (AU)

• Processo FAPESP: 08/09086-7 - Os pantanais: interações água-solo nas sub-regiões do Pantanal
• Beneficiário: Sonia Maria Furian
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/53524-1 - Laurent Barbiero | Institut de Recherche pour le Développement - França
• Beneficiário: Reynaldo Luiz Victória
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 11/12770-0 - Processos pedológicos e hidroquímicos na bacia do Alto Paraguai, Pantanal
• Beneficiário: Sonia Maria Furian
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/58089-9 - The role of rivers on the regional carbon cycle
• Beneficiário: Maria Victoria Ramos Ballester
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático