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Registro Completo |
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Biblioteca(s): |
Embrapa Agricultura Digital; Embrapa Pantanal. |
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Data corrente: |
05/09/2022 |
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Data da última atualização: |
27/09/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BERGIER, I.; ASSINE, M. L. |
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Afiliação: |
IVAN BERGIER TAVARES DE LIMA, CPAP, CNPTIA; MARIO LUIS ASSINE, UNIVERSIDADE ESTADUAL PAULISTA. |
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Título: |
Functional fluvial landforms of the Pantanal: hydrologic trends and responses to climate changes. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Journal of South American Earth Sciences, v. 119, 103977, nov. 2022. |
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DOI: |
https://doi.org/10.1016/j.jsames.2022.103977 |
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Idioma: |
Inglês |
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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 |
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Palavras-Chave: |
Avulsão do rio; Conservation; Critical state; Droughts; Estado crítico; Eventos extremos; Extreme events; Mudanças climáticas; River avulsion; Zonas úmidas. |
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Thesagro: |
Conservação; Seca. |
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Thesaurus Nal: |
Wetlands. |
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Categoria do assunto: |
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P Recursos Naturais, Ciências Ambientais e da Terra |
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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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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
16/03/2011 |
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Data da última atualização: |
12/08/2014 |
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Tipo da produção científica: |
Documentos |
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Autoria: |
LACERDA, A. E. B. de; NIMMO, E. R.; FARIA, B. S.; KELLERMANN, B.; ALBERGONI, L.; GARRASTAZU, M. C.; OLIVEIRA, Y. M. M. de; MATTOS, P. P. de; ROSOT, M. A. D. |
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Afiliação: |
ANDRE EDUARDO BISCAIA DE LACERDA, CNPF; Evelyn Roberta Nimmo, Professora da Universidade de Manitoba; Breno Silva Faria, Graduando em Engenharia Florestal; Betina Kellermann, Bióloga; Lisâneas Albergoni, Engenheira Florestal; MARILICE CORDEIRO GARRASTAZU, CNPF; YEDA MARIA MALHEIROS DE OLIVEIRA, CNPF; PATRICIA POVOA DE MATTOS, CNPF; MARIA AUGUSTA DOETZER ROSOT, CNPF. |
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Título: |
A identificação botânica no manejo florestal na Amazônia. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
Colombo: Embrapa Florestas, 2010. |
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Descrição Física: |
1 CD-ROM. |
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Série: |
(Embrapa Florestas. Documentos, 204). |
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Idioma: |
Português |
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Palavras-Chave: |
Manejo florestal. |
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Thesagro: |
Botânica; Espécie nativa; Identificação. |
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Thesaurus NAL: |
Amazonia. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/29758/1/Doc204.pdf
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Marc: |
LEADER 00770nam a2200277 a 4500
001 1881190
005 2014-08-12
008 2010 bl uuuu u0uu1 u #d
100 1 $aLACERDA, A. E. B. de
245 $aA identificação botânica no manejo florestal na Amazônia.
260 $aColombo: Embrapa Florestas$c2010
300 $c1 CD-ROM.
490 $a(Embrapa Florestas. Documentos, 204).
650 $aAmazonia
650 $aBotânica
650 $aEspécie nativa
650 $aIdentificação
653 $aManejo florestal
700 1 $aNIMMO, E. R.
700 1 $aFARIA, B. S.
700 1 $aKELLERMANN, B.
700 1 $aALBERGONI, L.
700 1 $aGARRASTAZU, M. C.
700 1 $aOLIVEIRA, Y. M. M. de
700 1 $aMATTOS, P. P. de
700 1 $aROSOT, M. A. D.
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Embrapa Florestas (CNPF) |
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