Hydraulic Conductivity Function
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar / Estimating the hydraulic properties of soils from capillary rise test
This study evaluates the potential of capillary rise test and a parameter optimization technique to estimate soil hydraulic parameters. The capillary rise is a simple and expedite test that is conditioned by soil hydraulic properties. In the mathematical representation of the capillary rise we used the model of Terzaghi (1943), who considered that saturated
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2012
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2. Influence of the distance of installation of tensiometers to calculate total potential gradient in the field soil hydraulic conductivity determination / Influência da distância de instalação de tensiômetros no campo para o cálculo do gradiente de potencial total no método do perfil instantâneo
The soil hydraulic conductivity determination method most used under unsaturated field conditions is the instantaneous profile method. This method is based on the integration of Richards equation in relation to soil depth, during the soil water redistribution process, after the profile has been saturated till the interest depth and the soil surface prevented
Publicado em: 2009
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3. EVAPOTRANSPIRAÇÃO DA MELANCIA IRRIGADA POR MEIO DO SEBAL, BALANÇO HÍDRICO E CORRELAÇÕES TURBULENTAS / ESTIMATING IRRIGATED WATERMELON EVAPOTRANSPIRATION USING SEBAL, SOIL-WATER BALANCE AND EDDY CORRELATIONS
In applications of the SEBAL (Surface Energy Balance Algorithm for Land) algorithm parameters for physical processes adjusted for other regions of the planet are commonly used. Therefore, there is a need for validation of the estimates made with the algorithm compared with other conventional methods of estimating evapotranspiration. Thus, this study main goa
Publicado em: 2009
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4. EVALUATION OF HYDRAULIC PROPERTIES OF UNSATURATED TROPICAL SOILS / AVALIAÇÃO DE PROPRIEDADES HIDRÁULICAS DE SOLOS TROPICAIS NÃO SATURADOS
The present research work had two main objectives. The first was to obtain a geotechnical index for measuring the weathering degree of gneissic residual soils. For that it were analyzed data corresponding to typical weathering profiles found in the municipality of Rio de Janeiro and executed a complete characterization of a specific weathering profile of fac
Publicado em: 2008
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5. Variabilidade espacial de atributos fisico-hidricos do solo cultivado com feijão irrigado sumetido a diferentes sistemas de preparo / Soil physical-hydric attributes spatial variability doe diferent irrigated bean tillage systems
Since last decades irrigation practices are recognized as major water consumers, requiring specific agricultural producers education and awareness on water use and supply. Recent research reports indicate significant water economy, crop yielding as well as contribution to sustainable agricultural development, if direct seedling, when compared with convention
Publicado em: 2007
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6. Low molecular weight lignosulfonates recovery by nanofiltration / Estudo da recuperação de lignossulfonatos de baixa massa molar por nanofiltração
Membrane separation processes like ultrafiltration (UF) and nanofiltration (NF) are used in the pulp and paper industry to the recovery of several species present in the wood digest waste that are interesting to other applications as lignin, sugars and specially lignosulfonates, improving the recirculation of the water in the pulping process and the reductio
Publicado em: 2007
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7. The structure of the endoparasite angiosperm Pilostyles ulei (Apodanthaceae): interface and impact on Mimosa ssp xylem / A estrutura da angiosperma endoparasita Pilostyles ulei (Apodanthaceae): interface e impacto no lenho de Mimosa spp
Pilostyles (Apodanthaceae) are endoparasitic angiosperms of Fabaceae stems and one of the most remarkable situations of body reduction. This study focuses the vegetative body of P. ulei. From an external view, there are only tiny flowers which break out the host periderm. Internally, they are connected to masses of vegetative body. These masses, formed by pa
Publicado em: 2007
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8. AplicaÃÃo dos modelos poro neutro e mÃdia geomÃtrica na estimativa da condutividade hidrÃulica de um latossolo / Comparison between the models of geometric average and neutral pore for the determination of the unsaturated hydraulic conductivity of a latossolo
In this work, it is shown an application of a model to obtain the hydraulic conductivity of soils no saturated using concepts Fractal Geometry and the laws of Laplace and of Poiseuille. For the obtaining of the soil water retention curve it was used the camera of pressure of Richards and the experimental data of hydraulic conductivity in function of the soil
Publicado em: 2006
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9. Modelagem da dinâmica da água e do potássio na irrigação por gotejamento superficial. / Dynamics of water and potassium modeling under superficial trickle irrigation.
The technique of fertigation application is winning acceptance, mainly in trickle irrigation, due to the advantages that it presents as the possibility of controlling the nutrition of the plants, as the case of the potassium, that is one of the most used fertilizers. However, the description of the transport of water and solute under real conditions presents
Publicado em: 2005
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10. Evaluation of the quality in a cohesive argisolic YELLOW LATOSOL - lax over the tableland soil, under a natural forest / Avaliação da qualidade de um LATOSSOLO AMARELO Coeso argissólico dos Tabuleiros Costeiros,sob floresta natural
The soil is a natural resource, whose functions in the healthy atmosphere are essential for the maintenance and development of life in the planet. Its capacity to function appropriately as substratum for vegetables filter and lid of residues, regulator of the flow of gases, water and energy is defined as the soil quality. The determination of the soil qualit
Publicado em: 2005
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11. On stochastic modeling of groundwater flow and solute transport in multi-scale heterogeneous formations
A numerical moment method (NMM) is applied to study groundwater flow and solute transport in a multiple-scale heterogeneous formation. The formation is composed of various materials and conductivity distribution within each material is heterogeneous. The distribution of materials in the study domain is characterized by an indicator function and the conductiv
Computational & Applied Mathematics. Publicado em: 2004-12
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12. Variabilidade da condutividade hidráulica do solo em valores fixos de umidade e de potencial matricial. / Variability of soil hydraulic conductivity at fixed values of water content and pressure head.
The knowledge of the soil hydraulic conductivity is essential to modeling soil water movement. Soil hydraulic conductivity (K) varies with water content and has a high spatial variability as well, either in field or in laboratory determinations. It can be represented as a function of water content (θ) or pressure head (ψm). According to Poiseuille�
Publicado em: 2004