Tendências De Variabilidade Espaço-Temporal Pluviométrica Na Bacia Hidrográfica Do Rio Araguaia

Gomes, Dênis; Ferreira, Nedilson; Lima, Aline Maria Meiguins de

doi:10.18677/encibio_2019a126

Cited by 4 publications

(7 citation statements)

References 13 publications

(14 reference statements)

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“…Figure 1 represents the location of the AW in central Brazil, comprising an area of approximately 384,818.0 km² divided into sub-basins (Araguaia Upper, River of Death, Araguaia Middle, Canton of Araguaia, and Araguaia Lower) where consisting of approximately 1,365,220 inhabitants of the states of Goiás, Mato Grosso, Pará, and Tocantins (Brasil, 2006). The Araguaia River rises in Serra dos Caiapós (Mineiros-GO) and travels to its mouth where it flows into the Tocantins river (Gomes et al, 2019a). The AW comprises 204 municipalities in the states of Goiás, Mato Grosso, Tocantins, and Pará.…”

Section: Study Areamentioning

confidence: 99%

“…In the AW, the effects of the ENSO phenomenon were studied by Marcuzzo and Romero (2013) for the state of Goiás, where they detected relatively moderate signals with a slight tendency of sensitivity to El Niño events. For the state of Mato Grosso, ENSO signals are low (Oliveira et al, 2015), which means that the rainfall regime in this region is modulated by other factors, probably synoptic systems (Gomes et al, 2019a;Faggiani et al, 2020).…”

Section: Precipitation: Estimated and Observedmentioning

confidence: 99%

“…These findings showed how much precipitation variability, despite decreasing, has isolated the cases of extreme events that can cause natural disasters. This scenario worsens when research points to the influence of El Niño in the AW region (Alves et al, 2011;Gomes et al, 2019a).…”

Section: La Niñamentioning

confidence: 99%

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Flow variability in the Araguaia River Hydrographic Basin influenced by precipitation in extreme years and deforestation

Gomes

Nascimento

Pereira

et al. 2022

Rev. Bras. Ciênc. Ambient.

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The climatic extremes and the dynamics of land use and cover can cause changes in river flow. The objective of this work was to analyze the flow of the Araguaia River under the effects of extreme years associated with the dynamics of land use in the Araguaia Watershed (AW) from 1981 to 2019. The land use and land cover product were based on the MapBiomas Project classification, imported from the Google Earth Engine. The measured rainfall and flow data were obtained from the National Water Agency. In contrast, the estimated rainfall was based on the data Climate Hazards Group InfraRed Precipitation with Stations. The precipitation climatology showed the lowest values (1,464.9–1,720.4 mm) in the south-central sector, and the highest (1,720.4–2,014.6 mm) rainfall amounts were observed in the north sector. However, it was identified in the five pluviometric stations with a high variability of precipitation, with an emphasis on the extreme years. Such wet and dry years were marked by a large difference in water availability. There was an intense reduction of the Amazon and Cerrado biomes by 31,641.8 and 42,618.9 km², respectively, mainly due to the expansion of 18,936.1 km² of agricultural activities and 47,494 km² of pasture. The fluviometric variability showed a decreasing trend, mainly in the past 15 years. Public actions, such as the intensification of environmental policies, monitoring focusing on the most compromised and strategic areas such as the headwaters of the Araguaia River, can minimize the impacts caused by climate extremes and deforestation.

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Section: Study Areamentioning

confidence: 99%

Section: Precipitation: Estimated and Observedmentioning

confidence: 99%

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Flow variability in the Araguaia River Hydrographic Basin influenced by precipitation in extreme years and deforestation

Gomes

Nascimento

Pereira

et al. 2022

Rev. Bras. Ciênc. Ambient.

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“…The drainage has numerous tributaries and sub-tributaries in the northern portion of the states of Maranhão, Tocantins, Goiás, Mato Grosso and the Federal District. With 967.000 km², it is considered the largest entirely Brazilian basin, being subdivided into 12 hydrographic regions, forming a hydrographic complex that permeates many ecosystems (Gomes et al 2019, Lowe-McConnell, 1999.…”

Section: Introductionmentioning

confidence: 99%

“…Being inserted in the southern portion of the Amazon basin, which is an important totally Brazilian catchment area and flowing through 4 Brazilian states (Goiás, Mato Grosso, Tocantins and Pará), in central western Brazil (Gomes et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Rio dos Bois: contribuições para a ictiofauna nas cabeceiras da bacia do rio Araguaia, Noroeste do Goiás, Brasil

Saviato

Junior²,

Lima³

2022

RSD

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Este estudo apresenta os resultados da diversidade de peixes em um trecho do Rio dos Bois, um manancial de Cerrado, localizado no noroeste do Goiás, Brasil. Sendo um importante tributário das cabeceiras do rio Araguaia, bacia Araguaia-Tocantins, que possui importantes atributos na manutenção da biota deste complexo ecossistema, e parte deste mosaico do Cerrado. A região estudada, compreende a calha principal do Rio dos Bois, da sua cabeceira até a foz do Rio Formiga. As amostragens da ictiofauna foram efetuadas ao longo de duas estações climáticas da região (seca e chuvosa), realizadas em junho/2021 e novembro/2021, respectivamente. As amostragens foram realizadas em 5 pontos amostrais, distribuídos equidistantes de montante à jusante, no Rio dos Bois. Como resultado registrou-se 15.645 espécimes distribuídos em uma riqueza de 46 espécies. Neste estudo, os resultados foram avaliados por testes ecológicos, tais como, frequência de ocorrência, Dominance_D, Simpson_1-D, Shannon_H’, Evenness_e^H/S, Brillouin, Menhinick, Margalef, Equitability_J, Fisher_alpha, Berger-Parker e Chao-1. E analisados pelo teste de normalidade no Tukey test e ANOVA-One way. Sendo possível identificar os locais amostrais mais diversos, assim como os pontos que apresentaram divergência entre alta taxa de captura e baixa diversidade. Indicando que, alguns sítios apresentam maior importância de conservação que outros, vislumbrando futuras ações prioritárias a preservação ambiental.

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Hydrological Effects on the Reproduction of the Giant South American River Turtle Podocnemis expansa (Testudines: Podocnemididae)

Simoncini

Sousa

Portelinha

et al. 2022

Ichthyology & Herpetology

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Tendências De Variabilidade Espaço-Temporal Pluviométrica Na Bacia Hidrográfica Do Rio Araguaia

Cited by 4 publications

References 13 publications

Flow variability in the Araguaia River Hydrographic Basin influenced by precipitation in extreme years and deforestation

Flow variability in the Araguaia River Hydrographic Basin influenced by precipitation in extreme years and deforestation

Rio dos Bois: contribuições para a ictiofauna nas cabeceiras da bacia do rio Araguaia, Noroeste do Goiás, Brasil

Hydrological Effects on the Reproduction of the Giant South American River Turtle Podocnemis expansa (Testudines: Podocnemididae)

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