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| Registros recuperados: 37 | |
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| OLIVEIRA JUNIOR, R. C. de. |
| A grande utilização das terras da parte leste do Estado do Pará com projetos agropecuários e extrações madeireiras, que de múltiplas formas modificam ou alteram a camada superficial dos solos deixando-os mais vulneráveis a ação da erosão hídrica causada pela chuva, planejou-se este estudo que visa determinar a erosividade das chuvas nessa região do Estado, como um primeiro passo para um programa de conservação. Para isto, coletou-se os dados pluviográficos existentes em sete municípios dos mais utilizados nesses projetos, a saber: Belém, Bragança, Cametá, Tucuruí, Marabá, Paragominas e Conceição do Araguaia. Usou-se a metodologia de Wischmeier e Smith modificada por Cabeda, para a determinação do índice nos locais acima referidos. Os resultados deste... |
| Tipo: Teses |
Palavras-chave: Índice de erosividade; Pará; Brasil; Erosion; Chuva; Deterioração do Solo; Erosão; Amazonia; Water erosion. |
| Ano: 1988 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/402455 |
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| Lima,Cleene A. de; Palácio,Helba A. de Q.; Andrade,Eunice M. de; Santos,Julio C. N. dos; Brasil,Paulilo P.. |
| The characteristics of rainfall can provide important information for management and land use may also minimize the water erosion problems. This study was carried out to evaluate soil and water loss in erosion plots with different coverage, and the interference of natural rainfall characteristics on these processes. The experiment was carried out during the rainy season in the years of 2009 and 2010, on three erosion plots, each of 20 m², and under different land use conditions: native 'caatinga', thinned 'caatinga' and natural herbaceous cover. The rainfall was classified into three different rainfall patterns, characterized as early, intermediate and late. The predominant rainfall pattern for the two years under study was early rainfall with 47.6%,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rainfall intensity; Erosivity; Water erosion. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013001100014 |
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| LIMA, J. E. F. W.; LOPES, W. T. A.; SILVA, E. M. da; VIEIRA, M. R.. |
| RESUMO: O conhecimento do comportamento hidrossedimentológico de uma bacia hidrográfica é fundamental para a adequada gestão e uso de seus recursos hídricos. Este traballho objetivou realizar, a partir dos dados hidrossedimentométricos da Bacia do Rio Piquiri, um diagnóstico sobre o seu comportamento hidrossedimentológico. Utilizando os dados fluviométricos e hidrossedimentométricos do banco de dados Hidro, sob gestão da Agência Nacional das Águas - ANA, foi estimado o potencial para produção ou deposição de sedimentos de cada trecho da bacia, aplicando o procedimento de balanço de massa. Foram identificados três trechos onde ocorre deposição de sedimentos na bacia: entre as estações Porto Carriel e Porto Guarani, no Rio Piquiri; entre as estações Porto... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Manejo da água; Sediment.; Bacia Hidrográfica; Erosão Hídrica; Hidrologia; Sedimento.; Qualidade da Água; Recurso Hídrico; Hydrology; Water quality; Water resources; Watersheds.; Water management; Water erosion. |
| Ano: 2004 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569087 |
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| LOPES, P. R. C.; COGO, N. P.; LEVIEN, R.. |
| A eficacia relativa de tipo e quantidade de residuos culturais espalhados uniformemente sobre uma superficie de solo recem-preparada, com aracao e gradagens, na porcentagem de cobertura do solo e na reducao da erosao hidrica, foi avaliada em condicoes de chuva simulada, na Estacao Experimental Agronomica da UFRGS, em Guaiba, RS. Utilizou-se um solo franco-arenoso (Podzolico Vermelho-Amarelo abrupto distrofico petroferrico), com declividade media 7,5%. Os tratamentos principais consistiram em residuos culturais de milho, trigo e soja - 0,500, 1.000, 2.000, 4.000, 6.000, 8.000 e 10.000 kg/ha, os quais forneceram cobertura de solo de 0 a 100%. Para uma mesma quantidade de massa de residuo cultural, as restevas de trigo e milho propiciaram valores de cobertura... |
| Tipo: Artigo de periódico |
Palavras-chave: Management; Mulch; Solo; Água; Cobertura Morta; Erosão Hídrica; Manejo; Soil; Water erosion. |
| Ano: 1987 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/132491 |
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| Back,Álvaro J.; Pola,Augusto C.; Ladwig,Nilzo I.; Schwalm,Hugo. |
| ABSTRACT This study aimed to determine the rainfall erosivity index in the Valley of Rio do Peixe, in the state of Santa Catarina, Brazil. The data series of three rain gauge stations in the cities of Campos Novos, Videira, and Caçador were used to determine the rainfall erosivity based on the EI30 index and to adjust the equations in order to estimate the EI30 value from the rainfall coefficient. On average, it was observed that erosive rains represents 81.4-88.5% of the annual precipitation. The adjusted equations can be used to estimate rainfall erosivity in locations with only rainfall data. The regional equation specified for the erosivity estimation is EI30 = 74.23 Rc0.8087. The R factor is 8,704.8; 7,340.8; and 6,387.1 MJ mm ha-1 h-1 year-1 for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil loss; Soil conservation; Water erosion; Precipitation. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100774 |
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| Back,Álvaro J.; Pola,Augusto C.; Ladwig,Nilzo I.; Schwalm,Hugo. |
| ABSTRACT Exploring the characteristics of erosive rain is an important aspect of studying erosive processes, and it allows researchers to create more natural and realistic hydrological simulations. The objective of this study was to analyse the characteristics of erosive rain and to determine the temporal distribution pattern of erosive rainfall in the Valley of Rio do Peixe in the state of Santa Catarina, Brazil. Daily pluviograms from the meteorological stations located in the cities Campos Novos, Videira, and Caçador in Santa Catarina from 1984 to 2014 were utilized for this study. By studying rainfall that is classified as erosive, the values of kinetic energy, maximum intensity in thirty minutes, and the value of EI30 erosivity index were determined.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Water erosion; Minimum tillage. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100780 |
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| Lense,Guilherme Henrique Expedito; Parreiras,Taya Cristo; Moreira,Rodrigo Santos; Avanzi,Junior Cesar; Mincato,Ronaldo Luiz. |
| ABSTRACT Water erosion is one of the main problems faced in coffee cultivation, as it promotes environmental degradation and crop yield decrease. Erosion estimates support the planning of conservation management practices and allowing determining the rates of soil losses. Thus, the objective of this paper was to estimate the soil loss by water erosion using the Erosion Potential Method in a sub-basin predominantly covered by coffee cultivation and then to compare the results with the Soil Loss Tolerance limits. The study area is the Coroado Stream Sub-basin, located at Alfenas Municipality, south of Minas Gerais, Brazil. The sub-basin presented an Erosion Coefficient of 0.272, indicating a predominance of low-intensity erosion. The total soil loss estimate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Water erosion; Modeling.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100225 |
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| Lense,Guilherme Henrique Expedito; Moreira,Rodrigo Santos; Bócoli,Fernanda Almeida; Avanzi,Junior Cesar; Teodoro,Alexandre Elias de Miranda; Mincato,Ronaldo Luiz. |
| ABSTRACT Among the parameters considered by the Revised Universal Soil Loss Equation (RUSLE), the soil cover and management factor (C) is the main human influenced factor affecting the estimation of water erosion, and one of the most sensitive to spatiotemporal variations. Consequently, this study aims to compare the efficiency of C factor estimates obtained from the literature for each land-use class (Clit) and by calculation based on the Normalized Difference Vegetation Index (CNDVI). We test the hypothesis that soil loss estimates based on CNDVI approach are more accurate than those based on Clit. Water erosion was estimated based on soil morphological, physical, and chemical properties in addition to climate, relief, management practices, and land use... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil conservation; Water erosion; Modeling; RUSLE. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100214 |
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| Martinez G,Ingrid; Ovalle,Carlos; Del Pozo,Alejandro; Uribe,Hamil; Valderrama V,Natalia; Prat,Christian; Sandoval,Marco; Fernández,Fernando; Zagal,Erick. |
| Chilean dryland areas of the Mediterranean climate region are characterized by highly degraded and compacted soils, which require the use of conservation tillage systems to mitigate water erosion as well as to improve soil water storage. An oat (Avena sativa L. cv. Supernova-INIA) - wheat (Triticum aestivum L. cv. Pandora-INIA) crop rotation was established under the following conservation systems: no tillage (Nt), Nt + contour plowing (Nt+Cp), Nt + barrier hedge (Nt+Bh), and Nt + subsoiling (Nt+Sb), compared to conventional tillage (Ct) to evaluate their influence on soil water content (SWC) in the profile (10 to 110 cm depth), the soil compaction and their interaction with the crop yield. Experimental plots were established in 2007 and lasted 3 yr till... |
| Tipo: Journal article |
Palavras-chave: Neutron probe; Penetrometer resistance; Oat; Subsoiling; Water erosion; Wheat. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400018 |
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| Mello, Eloy Lemos de; Universidade Estadual do Oeste do Paraná; Pruski, Fernando Falco; Universidade Federal de Viçosa; Bertol, Ildegardis; Universidade do Estado de Santa Catarina; Costa, Lucas Mucida; Universidade Federal de Viçosa; Menezes, Gleiph Ghiotto; Universidade Federal de Viçosa; Rodrigues, Nívia Carla; Universidade Federal de Viçosa. |
| The purpose of this work was to develop a hydrological model for the simulation of the water balance in agricultural areas. The model uses a double exponential equation to represent the rainfall profile and uses the Green-Ampt-Mein-Larson equation to estimate the soil water infiltration rate. To evaluate the model, monthly and yearly rainfall and runoff data were obtained from four experimental plots located at the State University of Santa Catarina, UDESC, in the period from 2003 to 2008. The four treatments were bare soil (BS), conventional tillage (CT), minimum tillage (MT) and no-tillage (NT). The simulation was carried out using two synthetic rainfall series, one adjusted on a monthly basis (SAMB) and the other adjusted on a daily basis (SADB). The... |
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Palavras-chave: Ciências Agrárias; Agronomia; Engenharia de Água e Solo; Conservação de Solo e Água 5.00.00.00-4; 5.03.02.00-0; 5.03.02.02-7 rrunoff; Infiltration; Water erosion; Hydrological modeling Ciências Agrárias; Engenharia de Água e Solo; Conservação de Solo e Água. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/14733 |
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| Avanzi,Junior Cesar; Viola,Marcelo Ribeiro; Mello,Carlos Rogério de; Giongo,Marcos Vinicius; Pontes,Lucas Machado. |
| ABSTRACT The state of Tocantins is inserted in the new Brazilian agricultural frontier and has shown enormous potential for expansion of the agricultural lands. However, there is a lack of more elaborate scientific information for better planning and guide agricultural activities, especially regarding the soil and water conservation. Tocantins has a relevant rainfall spatial variability and, consequently, rainfall erosivity. Thus, this work aimed to develop models to estimate the mean monthly and annual rainfall and means rainfall erosivity factor (R-factor) of the Universal Soil Loss Equation (USLE) for the state of Tocantins. For that, 97 historical series of daily rainfall were studied, considering a standard period of 25 years (1985-2009). The fitting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water erosion; Geostatistics; Regression-kriging; Soil and water conservation; Mapping. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100524 |
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| Machado,Roriz Luciano; Carvalho,Daniel Fonseca de; Rouws,Janaina Ribeiro Costa; Almeida,Wilk Sampaio de; Oliveira,Paulo Tarso Sanches de. |
| ABSTRACT The identification of areas with greater erosive potential is important for planning soil and water conservation. The objective of this study was to evaluate the physical characteristics of rainfall events in the state of Rio de Janeiro, Brazil, and their interactions with rainfall patterns through multivariate statistical analysis. Rainfall depth, kinetic energy, 30-min intensity (I30), duration of rainfall events, and the erosivity indices KE >10, KE >25, and EI30 in 36 locations (stations) were subjected to principal component analysis (PCA) and canonical discriminant analysis (CDA). Based on evaluation of the respective historical series of hyetographs, it was found that the advanced pattern occurs with highest frequency (51.8 %),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water erosion; EI30; Canonical discriminant analysis. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100535 |
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| Bispo,Diêgo Faustolo Alves; Silva,Marx Leandro Naves; Marques,João José Granate de Sá e Melo; Bechmann,Marianne; Batista,Pedro Velloso Gomes; Curi,Nilton. |
| ABSTRACT Identifying and ranking nutrient loss risk areas are important steps towards integrated catchment management. This study aimed to apply the P index model at the Posses catchment, south of the state of Minas Gerais, Brazil. We applied the P index for the current land use at the Posses catchment and for two hypothetical scenarios: scenario 1, in which P fertilizer was applied to all land uses, except for native forests; and scenario 2, which considered the use of P fertilizer as in scenario 1, and that the Environmental Protection Areas referring to the riparian forests and springs were totally restored. Considering current land use, almost the whole catchment area (91.4%) displayed a low P loss risk. The highest P index was associated to croplands... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: P index; Nutrient loss; Water erosion; Land use management; Environmental services.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000500565 |
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| Streck,E. V.; Cogo,N. P.. |
| Site-specific regression coefficient values are essential for erosion prediction with empirical models. With the objective to investigate the surface-soilconsolidation factor, Cf, linked to the RUSLE's prior-land-use subfactor, PLU, an erosion experiment using simulated rainfall on a 0.075 m m-1 slope, sandy loam Paleudult soil, was conducted at the Agriculture Experimental Station of the Federal University of Rio Grande do Sul (EEA/UFRGS), in Eldorado do Sul, State of Rio Grande do Sul, Brazil. Firstly, a row-cropped area was excluded from cultivation (March 1995), the existing crop residue removed from the field, and the soil kept clean-tilled the rest of the year (to get a degraded soil condition for the intended purpose of this research). The soil was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water erosion; Simulated rainfall; Soil consolidation; RUSLE equation. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832003000100015 |
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| Registros recuperados: 37 | |
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