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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
22/12/1999 |
Data da última atualização: |
22/12/1999 |
Autoria: |
ONODY, R. N.; POSADAS, D. A.; CRESTANA, S. |
Afiliação: |
USP-IFSC; Universidade Estadual de Ponta Grossa; EMBRAPA-CNPDIA. |
Título: |
Experimental studies of the fingering phenomena in two dimensions and simulation using a modified invasion percolation model. |
Ano de publicação: |
1995 |
Fonte/Imprenta: |
In: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 18., jun. 1995, Caxambu, MG. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1995. |
Páginas: |
p.102. |
Idioma: |
Inglês |
Conteúdo: |
Experiments of water infiltration in a vertical plane through layered soils were carried out in the laboratory. We have followed the fingering dynamics by using image techniques. The fractal theory has been applied to describe the fingering phenomena. We also have simulated a modified site gradient invasion percolation model where most of the physical ingredients relevant to the problem have been incorporated. Differently of to what happens with the standard gradient invasion percolation model, we have found the formation of many fingers. Taking into account the bond number, the number of fingers and the wetted area of the experiments, we have fitted the parameters of our model. This opens the possibility of a theoretical predictions of the pore size distribution of the soil. The results are then compared with the experimental data. |
Palavras-Chave: |
Bidimensional; Fingering phenomena; Model; Modelo; Percolacao; Percolation; Simulation; Two dimensional. |
Thesagro: |
Simulação; Solo. |
Thesaurus Nal: |
soil. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01713naa a2200289 a 4500 001 1026892 005 1999-12-22 008 1995 bl uuuu u00u1 u #d 100 1 $aONODY, R. N. 245 $aExperimental studies of the fingering phenomena in two dimensions and simulation using a modified invasion percolation model. 260 $c1995 300 $ap.102. 520 $aExperiments of water infiltration in a vertical plane through layered soils were carried out in the laboratory. We have followed the fingering dynamics by using image techniques. The fractal theory has been applied to describe the fingering phenomena. We also have simulated a modified site gradient invasion percolation model where most of the physical ingredients relevant to the problem have been incorporated. Differently of to what happens with the standard gradient invasion percolation model, we have found the formation of many fingers. Taking into account the bond number, the number of fingers and the wetted area of the experiments, we have fitted the parameters of our model. This opens the possibility of a theoretical predictions of the pore size distribution of the soil. The results are then compared with the experimental data. 650 $asoil 650 $aSimulação 650 $aSolo 653 $aBidimensional 653 $aFingering phenomena 653 $aModel 653 $aModelo 653 $aPercolacao 653 $aPercolation 653 $aSimulation 653 $aTwo dimensional 700 1 $aPOSADAS, D. A. 700 1 $aCRESTANA, S. 773 $tIn: ENCONTRO NACIONAL DE FISICA DA MATERIA CONDENSADA, 18., jun. 1995, Caxambu, MG. Resumos... Sao Paulo: Sociedade Brasileira de Fisica, 1995.
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Embrapa Instrumentação (CNPDIA) |
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Registro Completo
Biblioteca(s): |
Embrapa Agricultura Digital. |
Data corrente: |
19/12/2017 |
Data da última atualização: |
19/02/2018 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
ANDRADE, D. D. de; SILVA, J. dos S. V. da; FIGUEIREDO, V. A.; CASTRO, E. C. de. |
Afiliação: |
DANIEL DIAS DE ANDRADE; JOAO DOS SANTOS VILA DA SILVA, CNPTIA; VERA APARECIDA FIGUEIREDO, Bolsista DTI; ELISA CALHAU DE CASTRO. |
Título: |
Spatial analysis of erosive processes in plateaus and depressions of the Upper Paraguai river basin. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Geografia, Rio Claro, v. 42, n. 3, p. 145-157, set./dez. 2017. |
Idioma: |
Inglês |
Notas: |
Especial - Geopantanal 2016. |
Conteúdo: |
Natural characteristics may contribute to the erosion of the soil and to environmental imbalances, and in most cases, they initiate the imbalances that will be exacerbated by human activities. The presence of asymmetry in a frequency diagram is a valuable fact, and may indicate irregularity in the occurrence of events or aggregation of events in preferred locations. Thus, this work aims to demonstrate the use of Geographic Information Systems (GIS) of statistical analysis based on patterns of frequency, density, distribution and spatial dependence of sample points through a cutout of the mapping of the geotechnical aspects conducted for the State of Mato Grosso, generated for the entire area of plateaus and depressions of the Upper Paraguai river basin and its internal units of drainage basins. In most cutouts used in the analysis, the values indicated that is void the possibility that the distribution patterns of erosive events were resulted of chance. The aggregate pattern shown may tend to attract new points, facilitating the transmission of the samples qualities through these, favored by your proximity and by the characteristics of the occurrence area. |
Palavras-Chave: |
Bacia do Alto Paraguai; Distance; Distância; Erosion processes; Padrões de pontos; Patterns of points; Processos erosivos; Sistemas de Informações Geográficas. |
Thesagro: |
Análise estatística; Erosão. |
Thesaurus NAL: |
Geographic information systems; Pantanal; Statistical analysis. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/169248/1/AP-Spatial-JVila.pdf
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Marc: |
LEADER 02185nam a2200313 a 4500 001 2082868 005 2018-02-19 008 2017 bl uuuu u00u1 u #d 100 1 $aANDRADE, D. D. de 245 $aSpatial analysis of erosive processes in plateaus and depressions of the Upper Paraguai river basin.$h[electronic resource] 260 $aGeografia, Rio Claro, v. 42, n. 3, p. 145-157, set./dez. 2017.$c2017 500 $aEspecial - Geopantanal 2016. 520 $aNatural characteristics may contribute to the erosion of the soil and to environmental imbalances, and in most cases, they initiate the imbalances that will be exacerbated by human activities. The presence of asymmetry in a frequency diagram is a valuable fact, and may indicate irregularity in the occurrence of events or aggregation of events in preferred locations. Thus, this work aims to demonstrate the use of Geographic Information Systems (GIS) of statistical analysis based on patterns of frequency, density, distribution and spatial dependence of sample points through a cutout of the mapping of the geotechnical aspects conducted for the State of Mato Grosso, generated for the entire area of plateaus and depressions of the Upper Paraguai river basin and its internal units of drainage basins. In most cutouts used in the analysis, the values indicated that is void the possibility that the distribution patterns of erosive events were resulted of chance. The aggregate pattern shown may tend to attract new points, facilitating the transmission of the samples qualities through these, favored by your proximity and by the characteristics of the occurrence area. 650 $aGeographic information systems 650 $aPantanal 650 $aStatistical analysis 650 $aAnálise estatística 650 $aErosão 653 $aBacia do Alto Paraguai 653 $aDistance 653 $aDistância 653 $aErosion processes 653 $aPadrões de pontos 653 $aPatterns of points 653 $aProcessos erosivos 653 $aSistemas de Informações Geográficas 700 1 $aSILVA, J. dos S. V. da 700 1 $aFIGUEIREDO, V. A. 700 1 $aCASTRO, E. C. de
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