Simple Method for Predicting Drainage from Field Plots

Sisson, J. B.; Ferguson, A. H.; Genuchten, M. Th. van

doi:10.2136/sssaj1980.03615995004400060004x

Cited by 105 publications

(103 citation statements)

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“…Sisson et al (1980) applied the kinematic wave approach to internal drainage but Smith (1983) was the first to develop a complete kinematic wave model for soil moisture movement and Beven (1982) used it to describe two-dimensional flow in a sloping soil. Charbeneau (1984) extended Smith's work to solute transport and Charbeneau et al (1989) to multiphase solute transport.…”

Section: Materials and Methods Kinematic Wave Theorymentioning

confidence: 99%

“…For conditions of steady, vertical, gravity-driven flow equation through the unsaturated zone (where z is taken in the downward direction for convenience) a unit hydraulic gradient, ∇h = [0, 0, -1], is conventionally specified (Sisson et al, 1980). Therefore, assuming that ( / 1) h z ∂ ∂ = (Rasmussen at al., 2000) Equation (6) can be written as:…”

Section: Approach: the Kinematic Diffusion Modelmentioning

confidence: 99%

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Kinematic diffusion approach to describe recharge phenomena in unsaturated fractured chalk

Pastore

Cherubini

Giasi

2017

Journal of Hydrology and Hydromechanics

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When dealing with groundwater resources, a better knowledge of the hydrological processes governing flow in the unsaturated zone would improve the assessment of the natural aquifer recharge and its vulnerability to contamination. In North West Europe groundwater from unconfined chalk aquifers constitutes a major water resource, therefore the need for a good hydrological understanding of the chalk unsaturated zone is essential, as it is the main control for aquifer recharge. In the North Paris Basin, much of the recharge must pass through a regional chalk bed that is composed of a porous matrix with embedded fractures. The case study regards the role of the thick unsaturated zone of the Cretaceous chalk aquifer in Picardy (North of France) that controls the hydraulic response to rainfall. In order to describe the flow rate that reaches the water table, the kinematic diffusion theory has been applied that treats the unsaturated water flow equation as a wave equation composed of diffusive and gravitational components. The kinematic diffusion model has proved to be a convenient method to study groundwater recharge processes in that it was able to provide a satisfactory fitting both for rising and falling periods of water table fluctuation. It has also proved to give an answer to the question whether unsaturated flow can be described using the theory of kinematic waves. The answer to the question depends principally on the status of soil moisture. For higher values of hydraulic Peclet number (increasing saturation), the pressure wave velocities dominate and the preferential flow paths is provided by the shallow fractures in the vadose zone. With decreasing values of hydraulic Peclet number (increasing water tension), rapid wave velocities are mostly due to the diffusion of the flow wave. Diffusive phenomena are provided by matrix and fracture-matrix interaction.The use of a kinematic wave in this context constitutes a good simplified approach especially in cases when there is a lack of information concerning the hydraulic properties of the fractures/macropores close to saturation.

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Section: Materials and Methods Kinematic Wave Theorymentioning

confidence: 99%

Section: Approach: the Kinematic Diffusion Modelmentioning

confidence: 99%

Kinematic diffusion approach to describe recharge phenomena in unsaturated fractured chalk

Pastore

Cherubini

Giasi

2017

Journal of Hydrology and Hydromechanics

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“…the solutions to which are supplied by Lax (1972) and Sisson et al (1980) for different analytical expressions for K().…”

Section: Lax-θ Methodsmentioning

confidence: 99%

A Review of Approaches for Measuring Soil Hydraulic Properties and Assessing the Impacts of Spatial Dependence on the Results

Comegna¹,

Coppola²,

Basile³

et al. 2012

Hydrogeology - A Global Perspective

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“…Isso foi de grande interesse para profissionais da área porque somente medindo a umidade volumétrica durante a redistribuição da água no perfil poder-se-ia obter a condutividade hidráulica. Vári-os métodos de campo incorporaram essa suposição (Libardi et al, 1980;Sisson et al, 1980;Chong et al, 1981), embora sua validade seja frequentemente questionada. Os principais argumentos contra a utilização do gradiente hidráulico unitário referem-se ao fato de que a hipótese seria mais adequada a um perfil homogêneo (Reichardt, 1993;Bacchi & Reichardt, 1993;Falleiros et al, 1998) e de que os gradientes hidráulicos são influenciados pela natureza e complexidade do solo, variando com o tempo e a profundidade, não permanecendo, portanto, unitários durante o processo (Chong et al, 1981;Ahuja et al, 1988).…”

Section: Introductionunclassified

Comparação de métodos de determinação da condutividade hidráulica em um latossolo vermelho-amarelo

Ghiberto

Moraes²

2011

Rev. Bras. Ciênc. Solo

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RESUMOA determinação da condutividade hidráulica como variável do conteúdo de água volumétrico, K(θ θ θ θ θ), é essencial para resolver, por exemplo, problemas de drenagem. Todavia, diferentes métodos de determinação podem produzir resultados distintos, dependendo dos pressupostos assumidos. Objetivou-se com este estudo avaliar o desempenho de métodos diretos no campo (perfil instantâneo, métodos do fluxo e da umidade) e indireto no laboratório (a partir da condutividade hidráulica do solo saturado e da curva de retenção) na estimativa da relação K(θ θ θ θ θ). O experimento foi realizado em Piracicaba, Estado de São Paulo, Brasil, em um Latossolo Vermelho-Amarelo textura argiloarenosa, entre os meses de junho e agosto de 1999, por serem de baixa precipitação pluvial média mensal. A função K(θ θ θ θ θ) fornecida pelos diferentes métodos foi comparada utilizando-se o erro máximo absoluto e o índice da concordância. Todos os métodos apresentaram limitações na determinação da função K(θ θ θ θ θ) na tensão próxima à de saturação, sendo os maiores erros identificados nessa faixa de umidade. Os métodos do fluxo, da umidade e indireto no laboratório tiveram concordância de moderada a fraca quando comparados ao método do perfil instantâneo, mostrando que no solo Latossolo Vermelho-Amarelo textura argiloarenosa assumir que o gradiente é unitário resultou em estimativas errôneas dos valores de K(θ θ θ θ θ), causadas pela falta de homogeneidade no perfil do solo.

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Simple Method for Predicting Drainage from Field Plots

Cited by 105 publications

References 0 publications

Kinematic diffusion approach to describe recharge phenomena in unsaturated fractured chalk

Kinematic diffusion approach to describe recharge phenomena in unsaturated fractured chalk

A Review of Approaches for Measuring Soil Hydraulic Properties and Assessing the Impacts of Spatial Dependence on the Results

Comparação de métodos de determinação da condutividade hidráulica em um latossolo vermelho-amarelo

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