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| Santos,Júlio César Neves dos; Andrade,Eunice Maia de; Araújo Neto,José Ribeiro de; Meireles,Ana Célia Maia; Palácio,Helba Araújo de Queiroz. |
| Water body eutrophication process has been a serious problem around the world, especially in semiarid and arid region where main approach to storage water is reservoir. The aim of this work was to investigate the spatial and seasonal variability in water quality of a reservoir in a semi-arid tropical region with regards to its trophic state, and to identify the sources of nutrient input to the reservoir. Essa pesquisa foi realizada no reservatório Orós, segundo maior do estado do Ceará-Brasil. This research was developed in the Orós reservoir, the second one most important reservoir in Ceará State, Brazil. Samples were collected bimonthly during the period April 2008 to April 2010, from sex sampling points representing the outlet of tributaries, and one... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water resources; Reservoirs; Water quality. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100005 |
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| Santos,Julio Cesar Neves dos; Andrade,Eunice Maia de; Medeiros,Pedro Henrique Augusto; Palácio,Helba Araújo de Queiroz; Araújo Neto,José Ribeiro de. |
| ABSTRACT The semi-arid region in the northeast of Brazil is characterised by rains of high intensity and short duration, with the processes of erosion being aggravated by an inappropriate land-use model. In this region, the lack of measured data for runoff and sediment yield increases the need to apply hydro-sedimentological models in estimating erosion, requiring knowledge of the actual sediment delivery ratio for the region. The aim of this study therefore, was to map soil erosion, making use of the Universal Soil Loss Equation (USLE), in the Iguatu Experimental Watershed (IEW). The mean annual sediment delivery ratio (SDR), and the SDR for individual events, was calculated from hydro-sedimentological measurements, contributing to an understanding of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sediment yield; Soil erosion; USLE; SDR. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100049 |
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| Santos,Julio Cesar Neves dos; Palácio,Helba Araújo de Queiroz; Andrade,Eunice Maia de; Meireles,Ana Célia Maia; Araújo Neto,José Ribeiro de. |
| Although water erosion is the principle agent responsible for soil degradation, field data on the impacts of erosion, due to high operational costs and measurement difficulties, are scarce, especially in semiarid regions. In this context, the aim of this study was to evaluate runoff and soil and nutrient losses in uncultivated areas in the semiarid region of the state of Ceará in Brazil. The experiment was conducted in a 20 m² erosion plot that was uncultivated and populated with herbaceous plants. Data were collected during the rainy season from January to May 2009. Monthly water losses from overland flow ranged from 3.4 to 168.9 mm, representing 1.8 to 42.3% of the total monthly rainfall for January and April, respectively. Soil loss from erosion totaled... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil-erosion; Sediments (Geology); Arid regions. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902011000300030 |
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