Impactos do desmatamento e de mudanças climáticas nos recursos hídricos na Amazônia ocidental utilizando o modelo SLURP

Nóbrega, Ranyére Silva

doi:10.1590/0102-778620130024

Cited by 20 publications

(7 citation statements)

References 12 publications

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“…Existing studies on the conversion of natural soils to agriculture indicate resulting modifications to the hydrological regime. These modifications include changes in many important hydrologic parameters, including mean runoff and sediment concentration (Tucci, 2002;Rocha, 2010;Nobrega, 2014), siltation of river beds (Galdino et al, 2002), and interannual variability of minimum flows (Rocha, 2010;Rocha and Tommaselli, 2012).…”

Section: Hydrological Alterations In Dammed and Undammed Riversmentioning

confidence: 99%

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

Ely

Fantin-Cruz

Tritico

et al. 2020

Front. Environ. Sci.

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Tropical river basins have experienced dramatically increased hydropower development over the last 20 years. These alterations have the potential to cause changes in hydrologic and ecologic systems. One heavily impacted system is the Upper Paraguay River Basin, which feeds the Pantanal wetland. The Pantanal is a Ramsar Heritage site and is one of the world's largest freshwater wetlands. Over the past 20 years, the number of hydropower facilities in the Upper Paraguay River Basin has more than doubled. This paper uses the Indicators of Hydrologic Alteration (IHA) method to assess the impact of 24 of these dams on the hydrologic regime over 20 years (10 years before and 10 years after dam installation) and proposes a method to disentangle the effects of dams from other drivers of hydrologic change using undammed “control” rivers. While most of these dams are small, run-of-the-river systems, each dam significantly altered at least one of the 33 hydrologic indicators assessed. Across all studied dams, 88 of the 256 calculated indicators changed significantly, causing changes of 5–40%, compared to undammed reaches. These changes were most common in indicators that quantify the frequency and duration of high and low pulses, along with those for the rate and frequency of hydrologic changes. Importantly, the flow regime in several undammed reaches also showed significant alterations, likely due to climate and land-use changes, supporting the need for measurements in representative control systems when attributing causes to observed change. Basin-wide hydrologic changes (in both dammed and undammed rivers) have the potential to fundamentally alter the hydrology, sediment patterns, and ecosystem of the Pantanal wetland. The proposed refinement of the IHA methods reveals crucial differences between dam-induced alteration and those assigned to other drivers of change; these need to be better understood for more efficient management of current hydropower plants or the implementation of future dams.

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Section: Hydrological Alterations In Dammed and Undammed Riversmentioning

confidence: 99%

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

Ely

Fantin-Cruz

Tritico

et al. 2020

Front. Environ. Sci.

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“…Many causes can be related to the variability observed, including the atmospheric circulation patterns prevalent in the Amazon region, influenced by disturbances both on a regional and global scale. Such disturbances affect the hydrological regime of the region in its temporal scale (Nobre et al, 2007;Nóbrega, 2014). In addition, other processes such as ENSO (El Niño -Southern Oscillation), SACZ (Southern Atlantic Convergence Zone), among others, may be related to this variability, since the study proposed by Santos et al (2013) presented as part of its conclusions that such singularities influence the rainfall regime of the Amazon, which encompasses the region under study.…”

Section: Resultsmentioning

confidence: 99%

Probability of rainfall for the city of Cruzeiro do Sul, Acre, Brazil

et al. 2021

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Due to randomness in the occurrence of hydrological phenomena, the estimation of probable rain precipitation in a given region is important in assisting decision-making. This work aimed to adjust the probabilistic model of the Gamma distribution to the monthly and annual rainfall totals recorded in the city of Cruzeiro do Sul, Acre, for the period between 1970 and 2019, in addition to estimating the expected values at different probability levels. Using the maximum likelihood method, the distribution parameters were estimated, with adherence ratified by the Kolmogorov-Smirnov test. The results showed that the Gamma distribution was adequate to adjust the data; the region has two well-defined periods in its rainfall pattern; the mean precipitation values recorded in the locality are between 25% and 40% of probability. Finally, probable rainfall values were presented at different probability levels for the city of Cruzeiro do Sul.

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“…Com base nesses resultados pode-se inferir que os efeitos dos desmatamentos em ambiente amazônico poderão acarretar alterações no processo hidrológico, principalmente, poderá proporcionar uma resposta hidrológica mais rápida nos valores de escoamento superficial e lateral devido à diminuição dos processos de interceptação e de infiltração (Nóbrega, 2014).…”

Section: Conclusãounclassified

Dinâmica da Paisagem e seus Impactos Ambientais na Amazônia

Santos

Rocha

Santos

2019

Rev. Bras. Geog. Fis.

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Este estudo analisa os impactos ocasionados pela ação antrópica na bacia do rio Xingu e nas sub-bacias dos rios Fresco, Curuá e Ronuro, em diferentes escalas para o período de 2004 a 2014. O objetivo é avaliar temporalmente o processo de uso e ocupação do solo e seus impactos nos padrões da paisagem, com intuito de subsidiar estudos sobre possíveis alterações na resposta hidrológica de bacias hidrográficas. Os padrões da paisagem foram analisados a partir da estrutura fundiária da bacia com base nas áreas especialmente protegidas e nos imóveis rurais certificados. Os padrões da paisagem foram analisados tendo como referência as métricas geradas pelo software FRAGSTATS™ 3.3 e os dados do mapeamento das modificações do uso e ocupação do solo elaborado pelo projeto TerraClass do INPE. O resultado da análise da estrutura fundiária mostra que as áreas especialmente protegidas contribuem para conter, parcialmente, o avanço do desmatamento sobre paisagem original preservada, e que existe uma elevada concentração de área em terras privadas classificadas como latifúndios. Os padrões da paisagem indicam um comprometimento das manchas de floresta consequência do avanço da atividade produtiva, mas que também, observa-se um comprometimento das métricas analisadas das outras classes. Com isso conclui-se que a bacia do rio Xingu e as 3 sub-bacias estudadas podem vir ter a resposta hidrológica afetada, principalmente, a sub-bacia do rio Curuá, casos os avanços da atividade produtiva progridam sobre as manchas de florestas. Dynamics of Landscape and its Environmental Impacts in the Amazon A B S T R A C TThis study analyzes the impacts caused by anthropogenic action in the Xingu basin and in the sub-basins of the rivers Fresco, Curuá and Ronuro, in different scales for the period from 2004 to 2014. The objective is to evaluate temporarily the process of use and occupation of the soil and its impacts on landscape patterns, with the aim of supporting studies on possible alterations in the hydrological response of river basins. Landscape patterns were analyzed from the basin's land structure based on specially protected areas and certified rural properties. The landscape patterns were analyzed with reference to the metrics generated by the FRAGSTATS ™ 4.2 software and the data of the mapping of land use and land use modifications prepared by the INPE TerraClass project. The result of the analysis of the land structure shows that the specially protected areas contribute to partially contain the advance of deforestation on preserved original landscape, and that there is a high concentration of area in private lands classified as latifundia. The landscape patterns indicate a deterioration of forest patches as a consequence of the advance of the productive activity, but also, a reduction in the majority of the analyzed metrics is observed. With this, it can be concluded that the Xingu basin and the 3 sub-basins studied may have a hydrological response, mainly in the Curuá River sub-basin, in which cases the progress of the productive activity progresses on forest patches.Keywords: Land use and occupation, land structure, landscape metric, hydrographic basin.

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Impactos do desmatamento e de mudanças climáticas nos recursos hídricos na Amazônia ocidental utilizando o modelo SLURP

Cited by 20 publications

References 12 publications

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

Probability of rainfall for the city of Cruzeiro do Sul, Acre, Brazil

Dinâmica da Paisagem e seus Impactos Ambientais na Amazônia

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