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Registro Completo |
Biblioteca(s): |
Embrapa Agricultura Digital; Embrapa Pantanal. |
Data corrente: |
05/09/2022 |
Data da última atualização: |
27/09/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
BERGIER, I.; ASSINE, M. L. |
Afiliação: |
IVAN BERGIER TAVARES DE LIMA, CPAP, CNPTIA; MARIO LUIS ASSINE, UNIVERSIDADE ESTADUAL PAULISTA. |
Título: |
Functional fluvial landforms of the Pantanal: hydrologic trends and responses to climate changes. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Journal of South American Earth Sciences, v. 119, 103977, nov. 2022. |
DOI: |
https://doi.org/10.1016/j.jsames.2022.103977 |
Idioma: |
Inglês |
Conteúdo: |
Large-scale fluvial landforms emerge from iterative processes that sculpt Earth´s surface. Tectonics, climate variability and erosion are major recurrent processes reshaping fluvial landforms ending up in self-affine patterns. In the case of the Pantanal, the largest wetland in South America, its depositional tract can be subdivided as fluvial megafans, interfans and the main trunk system. Here we provide an outlook of their origins by means of self-affine landforms and on the feedback of climate changes over landform functionalities. Climate variability modulates the magnitude of interannual fluvial discharge and sediment load from highlands to plains, affects groundwater recharge, as well as the subsidence and generation of accommodation in the depositional tract through river avulsion. Scenarios are envisaged by analyzing long-term summer rainfall intensity and the number of dry days in autumn/winter over the Upper Paraguay River Basin, and annual flood peaks measured at fluvial gauge stations in the Paraguay River at Ladário (Brazil) and Asunción (Paraguay). The frequency distributions of the annual flood peaks are found unimodal for Asunción and bimodal for Ladário, which suggests an unknown water supply at Asunción, likely from Pilcomayo River and Pantanal´s groundwater. The latter might play a delayed role on Pantanal´s hydrologic functioning at 20-40 years timescales. Besides the Paraguay River flood peaks, summer rainfall intensity and the number of dry days in autumn/winter are quasi-periodic at interannual and decadal scales. Cross-correlations analyses indicate a long-range memory between river floods and rainfall intensity, and 15-20 years lag between river floods and the number of dry days in drought seasons. Trends analysis suggests that summer rainfall intensity and the number of dry days in autumn/winter have been consistently increasing by about 0.6 mm/day/decade and 1 day/decade, respectively. Therefore, magnifications of fluvial discharge and sediment load at wet seasons and water deficits at drought seasons are anticipated. Such a scenario indicates extreme dry cycles over all self-affine functional landforms, particularly on abandoned lobes relying exclusively on rainwater, whereas extremes of rainfall intensity at rivers headwaters may amplify the risks of large-scale avulsions at active lobes of the fluvial megafans. In contrast, active lobes of megafans, interfans and the main trunk river system emerge as hotpots for wildlife refuge and ecosystem services. MenosLarge-scale fluvial landforms emerge from iterative processes that sculpt Earth´s surface. Tectonics, climate variability and erosion are major recurrent processes reshaping fluvial landforms ending up in self-affine patterns. In the case of the Pantanal, the largest wetland in South America, its depositional tract can be subdivided as fluvial megafans, interfans and the main trunk system. Here we provide an outlook of their origins by means of self-affine landforms and on the feedback of climate changes over landform functionalities. Climate variability modulates the magnitude of interannual fluvial discharge and sediment load from highlands to plains, affects groundwater recharge, as well as the subsidence and generation of accommodation in the depositional tract through river avulsion. Scenarios are envisaged by analyzing long-term summer rainfall intensity and the number of dry days in autumn/winter over the Upper Paraguay River Basin, and annual flood peaks measured at fluvial gauge stations in the Paraguay River at Ladário (Brazil) and Asunción (Paraguay). The frequency distributions of the annual flood peaks are found unimodal for Asunción and bimodal for Ladário, which suggests an unknown water supply at Asunción, likely from Pilcomayo River and Pantanal´s groundwater. The latter might play a delayed role on Pantanal´s hydrologic functioning at 20-40 years timescales. Besides the Paraguay River flood peaks, summer rainfall intensity and the number of dry days in autu... Mostrar Tudo |
Palavras-Chave: |
Avulsão do rio; Conservation; Critical state; Droughts; Estado crítico; Eventos extremos; Extreme events; Mudanças climáticas; River avulsion; Zonas úmidas. |
Thesagro: |
Conservação; Seca. |
Thesaurus Nal: |
Wetlands. |
Categoria do assunto: |
-- P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 03427naa a2200301 a 4500 001 2146872 005 2022-09-27 008 2022 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1016/j.jsames.2022.103977$2DOI 100 1 $aBERGIER, I. 245 $aFunctional fluvial landforms of the Pantanal$bhydrologic trends and responses to climate changes.$h[electronic resource] 260 $c2022 520 $aLarge-scale fluvial landforms emerge from iterative processes that sculpt Earth´s surface. Tectonics, climate variability and erosion are major recurrent processes reshaping fluvial landforms ending up in self-affine patterns. In the case of the Pantanal, the largest wetland in South America, its depositional tract can be subdivided as fluvial megafans, interfans and the main trunk system. Here we provide an outlook of their origins by means of self-affine landforms and on the feedback of climate changes over landform functionalities. Climate variability modulates the magnitude of interannual fluvial discharge and sediment load from highlands to plains, affects groundwater recharge, as well as the subsidence and generation of accommodation in the depositional tract through river avulsion. Scenarios are envisaged by analyzing long-term summer rainfall intensity and the number of dry days in autumn/winter over the Upper Paraguay River Basin, and annual flood peaks measured at fluvial gauge stations in the Paraguay River at Ladário (Brazil) and Asunción (Paraguay). The frequency distributions of the annual flood peaks are found unimodal for Asunción and bimodal for Ladário, which suggests an unknown water supply at Asunción, likely from Pilcomayo River and Pantanal´s groundwater. The latter might play a delayed role on Pantanal´s hydrologic functioning at 20-40 years timescales. Besides the Paraguay River flood peaks, summer rainfall intensity and the number of dry days in autumn/winter are quasi-periodic at interannual and decadal scales. Cross-correlations analyses indicate a long-range memory between river floods and rainfall intensity, and 15-20 years lag between river floods and the number of dry days in drought seasons. Trends analysis suggests that summer rainfall intensity and the number of dry days in autumn/winter have been consistently increasing by about 0.6 mm/day/decade and 1 day/decade, respectively. Therefore, magnifications of fluvial discharge and sediment load at wet seasons and water deficits at drought seasons are anticipated. Such a scenario indicates extreme dry cycles over all self-affine functional landforms, particularly on abandoned lobes relying exclusively on rainwater, whereas extremes of rainfall intensity at rivers headwaters may amplify the risks of large-scale avulsions at active lobes of the fluvial megafans. In contrast, active lobes of megafans, interfans and the main trunk river system emerge as hotpots for wildlife refuge and ecosystem services. 650 $aWetlands 650 $aConservação 650 $aSeca 653 $aAvulsão do rio 653 $aConservation 653 $aCritical state 653 $aDroughts 653 $aEstado crítico 653 $aEventos extremos 653 $aExtreme events 653 $aMudanças climáticas 653 $aRiver avulsion 653 $aZonas úmidas 700 1 $aASSINE, M. L. 773 $tJournal of South American Earth Sciences$gv. 119, 103977, nov. 2022.
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13. | | BULLER, L. S.; BERGIER, I.; RECH, R. Greenhouse gas emissions mitigation in more sustainable agroecosystems in Cerrado. In: INTERNATIONAL SYMPOSIUM ON GREENHOUSE GASES IN AGRICULTURE, 2., 2016, Campo Grande, MS. Proceedings... Brasília, DF: Embrapa, 2016. p. 245-248. (Embrapa Gado de Corte. Documentos, 216). Coordenador Roberto Giolo de Almeida. II SIGEE. Disponível em: . Acesso em: 30 nov. 2016.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Pantanal. |
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18. | | NEVES, Y.; MISU, A.; URQUIZA, L.; BERGIER, I.; ALISSON, B. Estação de monitoramento de parâmetros ambientais com relógio CMOS. In: EVENTO DE INICIAÇÃO CIENTÍFICA DO PANTANAL, 3., 2015, Corumbá. Resumos...Corumbá: Embrapa Pantanal, 2015. (Embrapa Pantanal. Documentos, 133). p. 20Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Pantanal. |
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20. | | BERGIER, I.; SORIANO, E.; WIEDMAN, G.; KOSOSKI, A. Intensive and integrated farm systems using fermentation of swine effluent in Brazil. In: RUANE, J.; DARGIE,J. D.; MBA, C.; BOETTCHER, P.; MAKKAR, H. P. S.; BARTLEY, D. M.; SONNINO, A. (Ed.). Biotechnologies at work for smallholders: case studies from developing countries in crops, livestock and fish. FAO, 2013. 109-116Tipo: Capítulo em Livro Técnico-Científico |
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