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| Pruski,Fernando F.; Rodriguez,Renata Del G.; Nunes,Aline A.; Pruski,Pedro L.; Singh,Vijay P.. |
| ABSTRACT Knowledge of natural water availability, which is characterized by low flows, is essential for planning and management of water resources. One of the most widely used hydrological techniques to determine streamflow is regionalization, but the extrapolation of regionalization equations beyond the limits of sample data is not recommended. This paper proposes a new method for reducing overestimation errors associated with the extrapolation of regionalization equations for low flows. The method is based on the use of a threshold value for the maximum specific low flow discharge estimated at the gauging sites that are used in the regionalization. When a specific low flow, which has been estimated using the regionalization equation, exceeds the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water availability; Planning and management of water resources; Water safety. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000500808 |
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| Silva,Yuri Jacques Agra Bezerra da; Oliveira,Eliabe Barros de; Silva,Ygor Jacques Agra Bezerra da; Nascimento,Clístenes Williams Araújo do; Silva,Tatiana dos Santos; Boechat,Cácio Luiz; Teixeira,Marcos Paulo Rodrigues; Barbosa,Ronny Sobreira; Singh,Vijay P.; Sena,Antonny Francisco Sampaio de. |
| ABSTRACT: Environmental impacts caused by the addition of rare earth elements (REEs) to agricultural soils are a growing concern. The sedimentary basin of the Gurguéia River is located in one of the last agricultural frontiers in Brazil; nevertheless, data regarding quality reference values (QRVs) for REEs in soils are still scarce. The objective of this study was therefore to determine the natural concentration and establish the QRVs of REEs in soils of Gurguéia watershed, Brazil. Fifty-five composite soil samples were collected at sites under no or minimal anthropic interference. The average REE natural concentrations in soils from the Gurguéia watershed were lower than those found in other regions of Brazil and worldwide, following the order (mg kg−1):... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: REE geochemistry; Gurguéia watershed; Oxisols; Lanthanides. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000701401 |
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