Richards Equation
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. A sinusoidal equation as an alternative to classical growth functions to describe growth profiles in turkeys
ABSTRACT. Because of the relatively long growing cycle and the high cost of research into turkey production and nutrition, the potential benefits from modelling growth in this avian species are considerable. Though there are many studies aimed at evaluating animal growth models, the number of studies targeting growth models in turkeys is quite limited. In th
Acta Sci., Anim. Sci.. Publicado em: 04/07/2019
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2. Scaling to generalize a single solution of Richards' equation for soil water redistribution
Using scaling methods, a single solution of Richards' equation (RE) will suffice for numerous specific cases of water flow in unsaturated soils. In this study, a new method is developed to scale RE for the soil water redistribution process. Two similarity conditions are required: similarity in the shape of the soil water content profiles as well as of the wa
Scientia Agricola. Publicado em: 2011-10
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3. Modelling of acid mine drainage (AMD) in columns
A model is proposed in this paper to describe the generation of acid mine drainage (AMD) in leaching columns. The model considers: (i) Water flow through the column, which is calculated using the 1 - D analytic solution of the Richards' equation assuming the existence of a similarity relationship between the water retention function and the water content pro
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09
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4. Simulação de fluxo de água e transporte de solutos na zona não-saturada do solo pelo método de elementos finitos adaptativo / Simulation of water flow and solute transport in the unsaturated zone of the soil by adaptative finite element method
Devido aos riscos de contaminação dos recursos naturais solo e água, ao alto custo, ao tempo e ao esforço humano nas investigações de campo, os modelos matemáticos, aliados às técnicas numéricas e aos avanços computacionais, constituem uma ferramenta importante na previsão do deslocamento de solutos, contribuindo assim, para o controle de altera�
Publicado em: 2009
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5. 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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6. NUMERICAL IMPLEMENTATION OF ACOPPLING SURFACE WATER: GROUNDWATER / UMA IMPLEMENTAÇÃO NUMÉRICA DO ACOPLAMENTO ÁGUA SUPERFICIAL: ÁGUA SUBTERRÂNEA
While analyzing the interaction between the hydrological processes of surface and groundwater flow, it is seen that there is a big difference in its interaction in the space and time. These processes can be represented in a qualitative form as part of the hydrological cycle, demonstrating its dependences and importance in the hydrological balance. This work
Publicado em: 2007
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7. Numerical simulation of the water movement and solutes in soil unsaturated / Simulação numérica do movimento de água e solutos em solos não saturados
The interest in studying problems of underground drainage and solutos transport not in soils saturated it has been increasing significantly in the last years, mainly because of the growing concern with the quality of the soil and of the environment in general. Applied fertilizers in agricultural lands move below the zone radicular of the plants and they can
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. Modeling solute transport through unsaturated porous media using homogenization I
In this paper we consider homogenization of the diffusion, adsorption and convection of chemical species in porous media, that are transported by unsaturated single phase flows. The unsaturated flow is described by the Richards' equation. We present in details a rigorous derivation of the corresponding dual porosity model. Then we give the derivation by homo
Computational & Applied Mathematics. Publicado em: 2004-12
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10. CRESCIMENTO E PRODUÇÃO DE TECTONA GRANDIS LINN F., EM POVOAMENTOS JOVENS DE DUAS REGIÕES DO ESTADO DE MATO GROSSO - BRASIL / GROWTH AND YIELD OF TECTONA GRANDIS LINN F. FOR THE STATE OF MATO GROSSO BRAZIL
The Tectona grandis Linn F. was introduced in Mato Grosso in the end of the sixties and new planting is made each year in the State with the aim of replacing native woods of noble use. Beyond the expectation of great future gains the teak plantations are, most of the time, made in the mosaic system. This system is certainly the greatest advantage of this woo
Publicado em: 2004
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11. CaracterizaÃÃo hidrodinÃmica de solos em campo e em laboratÃrio: anÃlise numÃrica e fractal / Hydrodynamic characterization of soils in the field and in laboratory: numerical and fractal analysis
The soil-water retention curve h(θ) and the hydraulic conductivity curve K(θ) were experimentally determined, from internal drainage and infiltration experiments, and estimated using the inverse method and pedo-transfer functions for a topsoil layer of two soils: a sandy soil contained in a lysimeter, and a Fluvent soil with loamy-sand texture, loc
Publicado em: 2004
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12. Building a hydrological analysis and simulation system for drainage basin application. / Construção de um sistema de análise e simulação hidrológica: aplicação a bacias hidrográfica.
Hydrological models are useful tools to understand the hydrological behavior of watersheds. These models should represent most of hydrological processes to be able to produce realistic results. However, models are only an aproximation of the truth and they require good initialization of state variables and a large amount of data to properly represent the pro
Publicado em: 2003