Four decades of land-cover, land-use and hydroclimatology changes in the Itacaiúnas River watershed, southeastern Amazon

Souza-Filho, Pedro Walfir M.; Souza, Everaldo Barreiros de; Júnior, Renato Oliveira Silva; Nascimento, Wilson R.; Mendonça, Breno R. Versiani de; Guimarães, José Tasso Felix; Dall’Agnol, Roberto; Siqueira, José Oswaldo

doi:10.1016/j.jenvman.2015.11.039

Cited by 129 publications

(112 citation statements)

References 39 publications

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“…The Carajás plateau is a prominent feature in the landscape of the area, whose altitude ranges from 600 to 900 m, which contrasts with the adjacent areas with altitudes ranging from 80 to 300 m. In the area of the basin, originally two types of land cover predominate -tropical rainforest and mountain savannah -but, at present, the land use is dominated by extensive pastures that surround a mosaic of forest remnants. The latter occupy indigenous lands and other protected conservation areas, which occupy cover 11,700 km 2 , or approximately a quarter of the area of the basin (Souza-Filho et al 2016). The climate in the region is typical monsoon (Am) (Alvares et al 2014).…”

Section: Study Sitementioning

confidence: 99%

Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon

Júnior

Souza

Tavares

et al. 2017

An. Acad. Bras. Ciênc.

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This study estimated the reference evapotranspiration rate (ETo) for the Itacaiúnas River Watershed (IRW), Eastern Amazonia, and measured the accuracy of eight empirical equations: Penman-Monteith (PM), Priestley-Taylor (PT), Hargreaves and Samani (HS), Camargo (CAM), Thornthwaite (TH), Hamon (HM), Kharrufa (KF) and Turc (TC) using monthly data from 1980 to 2013. In addition, it verifies the regional applicability to the IRW using a for the Marabá-PA station. The methods TC and PM (FAO56) presented the best results, which demonstrate that radiation and higher temperatures are the dominant drivers in the Evapotranspiration process, while relative humidity and wind speed have a much smaller impact. The temporal and spatial variability of ETo for IRW show has strong seasonality, increasing during the dry season and decreasing during the rainy season. The statistical analyses at 1% level of significance, indicates that there is no correlation of the residuals between the dry and rainy seasons, and test of the physical parameters such as mean temperature, solar radiation and relative air humidity explains the variations of ETo.

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Section: Study Sitementioning

confidence: 99%

Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon

Júnior

Souza

Tavares

et al. 2017

An. Acad. Bras. Ciênc.

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“…Findings from coupled land surface and climate models driven with deforestation scenarios show that enhanced flow due to future deforestation may balance the flow‐reducing effects of projected climate change (Guimberteau et al, ), which include increased temperature and reduced humidity (Souza‐Filho et al, ). Our study suggests this dynamic is already governing flow in deforested basins in Amazon‐Cerrado Brazil.…”

Section: Discussionmentioning

confidence: 99%

“…Water science examining deforestation effects on streamflow in this globally important region is substantial but incomplete with respect to the production of policy‐relevant, extensible understanding of the effects of land cover and land cover change on hydrology. First, studies of individual river basins in southern Amazonia demonstrate that deforestation has the capacity to increase streamflow at multiple spatial scales (Coe et al, ; Costa et al, ; Dias et al, ; Hayhoe et al, ; Neill et al, ; Panday et al, ; Souza‐Filho et al, ); however, individual basin‐level findings lack regional generalizability. Second, regional model‐based studies (Coe et al, ; Lima et al, ; Stickler et al, ) are scenario‐driven and provide boundary conditions on regional change, but not explicit assessments of realized streamflow change.…”

Section: Introductionmentioning

confidence: 99%

Land Use Change Increases Streamflow Across the Arc of Deforestation in Brazil

Levy

Lopes

Cohn

et al. 2018

Geophysical Research Letters

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Nearly half of recent decades' global forest loss occurred in the Amazon and Cerrado (tropical savanna) biomes of Brazil, known as the arc of deforestation. Despite prior analysis in individual river basins, a generalizable empirical understanding of the effect of deforestation on streamflow across this region is lacking. We frame land use change in Brazil as a natural experiment and draw on in situ and remote sensing evidence in 324 river basins covering more than 3 × 106 km2 to estimate streamflow changes caused by deforestation and agricultural development between 1950 and 2013. Deforestation increased dry season low flow by between 4 and 10 percentage points (relative to the forested condition), corresponding to a regional‐ and time‐averaged rate of increase in specific streamflow of 1.29 mm/year2, equivalent to a 4.08 km3/year2 increase, assuming a stationary climate. In conjunction with rainfall and temperature variations, the net (observed) average increase in streamflow over the same period was 0.76 mm/year2, or 2.41 km3/year2. Thus, net increases in regional streamflow in the past half century are 58% of those that would have been experienced with deforestation given a stationary climate. This study uses a causal empirical analysis approach novel to the water sciences to verify the regional applicability of prior basin‐scale studies, provides a proof of concept for the use of observational causal identification methods in the water sciences, and demonstrates that deforestation masks the streamflow‐reducing effects of climate change in this region.

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“…This can have consequences such as reduced groundwater recharge and low flows (Rodriguez et al, 2010), enhanced surface runoff and high flows (Salemi et al, 2013), and faster rainfall-runoff responses (Ramírez et al, 2017). At large scales, deforestation and reductions in evapotranspiration are also linked to reductions in average rainfall or in rainfall frequency (Ellison et al, 2012;Lawrence & Vandecar, 2015;Salazar et al, 2015;Souza-Filho et al, 2016;Sumila et al, 2017), since precipitation recycling represents a fundamental part of the water cycle (Martinez & Dominguez, 2014). Direct impacts of land use change in the hydrological cycle have been extensively examined, with recent research (Boutt & Iroume, 2017), revealing an increased interest in research exploring South American data.…”

Section: Introductionmentioning

confidence: 99%

The Role of Land Cover in the Propagation of Rainfall Into Streamflow Trends

Chagas

Chaffe

2018

Water Resources Research

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The replacement of natural forests with agriculture is generally associated with modifications in the hydrological behavior of a basin. This is particularly notable in the tropics and subtropics. Southern Brazil is a region with extensive agricultural production, forest conservation, and a vast unexplored streamflow data despite substantial rainfall trends observed in recent decades. In this work, we explore trends in the streamflow regime in the majority of the monitored basins in Southern Brazil. Additionally, we evaluate if pristine forested basins and agricultural nonforested basins have significantly different streamflow responses to changes in rainfall. We analyzed annual averages, maxima, minima, and seasonality of a 36‐year data set (1975–2010) of 675 rainfall and 140 streamflow gauges. Results reveal that large trends are widespread in Southern Brazil, especially in basins with areas smaller than 10,000 km2. Changes in the rainfall regime did not directly translate into changes in the streamflow regime. Changes in the annual maximum flow of forested basins were not statistically significant even when the annual average and maximum rainfall increased significantly. Correlations between changes in rainfall and streamflow for two indices, namely, duration of low‐magnitude events and seasonality, were statistically significant (p < 0.05) only for agricultural basins. The results indicate a higher propagation of hydrological changes through anthropogenically modified systems, providing evidence that agricultural basins are more sensitive to changes in the rainfall regime.

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Four decades of land-cover, land-use and hydroclimatology changes in the Itacaiúnas River watershed, southeastern Amazon

Cited by 129 publications

References 39 publications

Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon

Three decades of reference evapotranspiration estimates for a tropical watershed in the eastern Amazon

Land Use Change Increases Streamflow Across the Arc of Deforestation in Brazil

The Role of Land Cover in the Propagation of Rainfall Into Streamflow Trends

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