Relações entre fluxos de água subterrânea e superficial em bacia hidrográfica caracterizada por cobertura florestal amazônica.

Franken, Wolfram; Leopoldo, Paulo Rodolfo

doi:10.1590/1809-43921986161262

Cited by 5 publications

(1 citation statement)

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“…Experimental studies in the Amazon have contributed to a better understanding of (a) hydrological processes (Franken et al 1986, Lesack 1993, Hodnett et al 1997, Wickel et al 2008 dynamics under different conditions of seasonal rainfall variability in that biome (Broedel et al 2017).…”

Section: Main Findings and Advancesmentioning

confidence: 99%

The big picture of field hydrology studies in Brazil

Melo

Anache

Almeida

et al. 2020

Hydrological Sciences Journal

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In-situ hydrological monitoring is essential for a proper decision-making process and modelling. Efforts have been made in Brazil to carry out field activities at the basin scale, but how complete and comprehensive are those studies? Where are they located? How long have they been carried out? What are the main findings? To answer these questions, an overview of experimental monitoring basins in Brazil is presented, listing their geographical locations, monitored variables, operational status, monitoring periods and main publications. We identified 60 monitored sites, spread across most Brazilian biomes, with an average monitoring period of 12 years. However, some publications from these monitoring studies are not fully accessible to the international community. Field hydrology activities in Brazil contribute to a better understanding of hydrological processes in humid and semiarid regions and inform us about the impacts of land-use change on water quality and quantity.

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Section: Main Findings and Advancesmentioning

confidence: 99%

The big picture of field hydrology studies in Brazil

Melo

Anache

Almeida

et al. 2020

Hydrological Sciences Journal

View full text Add to dashboard Cite

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Water storage and runoff processes in plinthic soils under forest and pasture in eastern Amazonia

Moraes

Schuler

Dunne

et al. 2006

Hydrological Processes

118

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Abstract:Extensive areas of the Amazon River basin are underlain by soils with shallow impeding horizons. To evaluate how the distinctive hydraulic properties of soil with a plinthic horizon under forest and pasture affect water storage and runoff process, two first-order catchments drained by ephemeral streams were instrumental in eastern Amazonia. Field measurements showed the presence of a strong vertical gradient of saturated hydraulic conductivity, which declines to extremely low values (median <1 mm h 1 ) at the plinthite layer, limiting both vertical and lateral flow, and keeping the soil water content close to saturation throughout most of the wet season. This scenario led to the frequent occurrence of saturation overland flow (SOF) under both land covers and very small amounts of shallow sub-surface flow (SSF). The annual flow in the exit channels was 3Ð2% of throughfall (2Ð7% of annual rainfall) under forest and 17% of annual rainfall for pasture, while the frequency of days with overland flow (OVF) was about 60% of the days for both catchments during the wet season. In the forest, all OVF originated from saturated areas, while in the pasture, infiltration-excess OVF accounted for 40% of the runoff and SOF accounted for 55% of runoff. The higher flow generation in the pasture could be explained by the higher water storage compared to the forest, promoting more frequent SOF, and additionally by the lower hydraulic conductivity near the surface favouring the occurrence of Horton overland flow (HOF).

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Riparian wetlands of low-order streams in Brazil: extent, hydrology, vegetation cover, interactions with streams and uplands, and threats

et al. 2022

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Low-order streams and riparian wetlands are important contributors to the drainage network in the landscape. However, there has been little research into the nature of these ecosystems in Brazil. Our estimates show that riparian wetlands of low-order streams and other small associated wetlands cover at least 25% of the forested part of the Amazon basin and about 10% of the Cerrado region. Information on the semi-arid Caatinga is lacking, but ~ 3% of the area may be occupied by riparian wetlands and other small wetland types, many of which are periodically dry. Riparian vegetation includes a very large richness in tree species. The amount and species richness of herbaceous plants depend on light availability. In-streams of the semi-arid region of Brazil, hydrophytes are restricted by unpredictable flash floods and periodic drought. Aquatic food webs are largely based on the organic matter produced by the riparian vegetation. Large-scale agriculture and cattle ranching pose a serious threat to riparian wetlands, their biodiversity, and their function as a buffer in the hydrological cycle of the landscape. A nation-wide screening program would provide a more detailed picture and allow the elaboration of a national conservation and restoration program for the Brazilian riparia.

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Relações entre fluxos de água subterrânea e superficial em bacia hidrográfica caracterizada por cobertura florestal amazônica.

Cited by 5 publications

References 1 publication

The big picture of field hydrology studies in Brazil

The big picture of field hydrology studies in Brazil

Water storage and runoff processes in plinthic soils under forest and pasture in eastern Amazonia

Riparian wetlands of low-order streams in Brazil: extent, hydrology, vegetation cover, interactions with streams and uplands, and threats

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