An instantaneous profile method for determining the hydraulic conductivity of unsaturated porous materials

Watson, K. K.

doi:10.1029/wr002i004p00709

Cited by 272 publications

(173 citation statements)

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“…Os parâmetros da equação (2), obtidos para as respectivas profundidades, encontram-se no quadro 2, no qual foram colocados também os dados de densidade do solo. A condutividade hidráulica K em função da umidade do solo θ para as mesmas profundidades foi determinada pelo método do perfil instantâneo (Watson, 1966) no campo (Carvalho, 2003) em área adjacente à planta escolhida. A equação representativa desta função foi da forma exponencial:…”

Section: Caracterização Físico-hídrica Do Solounclassified

Balanço de água no volume de solo explorado pelo sistema radicular de uma planta de citros

Cruz

Libardi²,

Carvalho³

et al. 2005

Rev. Bras. Ciênc. Solo

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RESUMOA produtividade das culturas agrícolas, associada às condições climáticas e edáficas, depende da disponibilidade de água e nutrientes no solo em época e quantidades apropriadas. A falta ou excesso de água no solo são fatores limitantes ao crescimento vegetal e podem diminuir a produtividade. Portanto, estudos que levem a um melhor entendimento de como a água se comporta na zona radicular de uma cultura agrícola no campo são de importância indiscutível ao adequado manejo agrícola. O objetivo do presente trabalho foi avaliar o método do balanço de água no solo aplicado ao volume de solo explorado pelo sistema radicular de uma planta de citros, considerando cinco profundidades de solo e cinco distâncias horizontais do tronco em duas direções a partir do tronco (uma ao longo e outra perpendicular à linha de plantas) e, então, verificar a contribuição de cada uma das camadas de solo avaliadas à evapotranspiração real da planta. O experimento foi realizado num Latossolo Vermelho-Amarelo distrófico argissólico em um pomar de citros, no município de Piracicaba (SP), durante dois períodos, um seco (40 dias) e um chuvoso (37 dias). Para atender ao objetivo proposto, um conjunto de 25 tensiômetros (cinco profundidades x cinco distâncias do tronco) foi instalado ao longo da linha e um outro, idêntico, perpendicular à linha, em direção à entrelinha. A armazenagem foi calculada a partir das leituras dos dois conjuntos de 25 tensiômetros cujos potenciais mátricos determinados foram convertidos em umidades volumétricas pelas

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Section: Caracterização Físico-hídrica Do Solounclassified

Balanço de água no volume de solo explorado pelo sistema radicular de uma planta de citros

Cruz

Libardi²,

Carvalho³

et al. 2005

Rev. Bras. Ciênc. Solo

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“…The method was first suggested by Richards et al (1956) on the basis of simultaneous monitoring of water retention and flux in laboratory soil columns. Later, the method was adapted for practical field use (Watson, 1966). Simplified variants have been developed which require fewer in situ measurements but depend on flow approximations (Nielsen et al, 1973;Ahuja et al, 1988).…”

Section: Internal Drainage Methodsmentioning

confidence: 99%

Determining Soil Hydraulic Properties

Durner

Lipsius

2005

Encyclopedia of Hydrological Sciences

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Hydraulic properties are required for modeling water and solute transport in unsaturated soils. The bottleneck for the successful application of numerical simulation models lays usually in their parameter estimation requirements. Methods to determine hydraulic properties can be classified into indirect and direct approaches. Indirect methods encompass the estimation of hydraulic properties by pedotransfer functions from more easily measured soil properties, and the prediction of the unsaturated hydraulic conductivity function from the water retention curve ( WRC ). In direct methods, observations of flow attributes from laboratory or field experiments are evaluated. This article reviews common methods to estimate the hydraulic conductivity function from the water retention characteristic and various direct measurement techniques in the laboratory and the field. We conclude with an outlook on contemporary developments in measurement techniques, stressing the key role of inverse modeling of experiments to derive optimum hydraulic properties and the importance of a future combination of noninvasive measurement techniques with inverse modeling by stochastic data fusion.

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“…SHCF of each column was determined by the instantaneous profile method (Watson, 1966;Ng and Leung, 2012;Leung et al, 2016a) …”

Section: Interpretation Methodsmentioning

confidence: 99%

Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions

Leung

2019

Géotechnique

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Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions Ni, J. J .; Leung, Anthony; Ng, C. W. W. Published in: Géotechnique DOI:10.1680/jgeot.17.t.044 Publication date: 2018 Document Version Peer reviewed version Link to publication in Discovery Research Portal Citation for published version (APA):Ni, J. J. ., Leung, A., & Ng, C. W. W. (2018). Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions. Géotechnique. https://doi.org/10.1680/jgeot.17.t.044 General rightsCopyright and moral rights for the publications made accessible in Discovery Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from Discovery Research Portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain.• You may freely distribute the URL identifying the publication in the public portal. Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Accepted manuscript doi:10.1680/jgeot.17.t.044 Accepted manuscriptAs a service to our authors and readers, we are putting peer-reviewed accepted manuscripts (AM) online, in the Ahead of Print section of each journal web page, shortly after acceptance. DisclaimerThe AM is yet to be copyedited and formatted in journal house style but can still be read and referenced by quoting its unique reference number, the digital object identifier (DOI). Once the AM has been typeset, an 'uncorrected proof' PDF will replace the 'accepted manuscript' PDF. These formatted articles may still be corrected by the authors. During the Production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal relate to these versions also. Version of recordThe final edited article will be published in PDF and HTML and will contain all author corrections and is considered the version of record. Authors wishing to reference an article published Ahead of Print should quote its DOI. When an issue becomes available, queuing Ahead of Print articles will move to that issue's AbstractEffects of plant roots on changes of soil hydraulic properties, including soil water retention curves (SWRC) and soil hydraulic conductivity functions (SHCF), are not well understood, especially when soil is unsaturated and vegetated with multiple plant species. This note aims to quantify the root effects on both SWRC and SHCF of silty sand using the instantaneous profile method. Four types of vegetated soil, namely bare, grass-only, tree-only and mixed tree-grass soils, were subjected to a controlled drying-wetting cycle in a plant room. Plant roots affect the air-entry value, saturated hydrau...

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An instantaneous profile method for determining the hydraulic conductivity of unsaturated porous materials

Cited by 272 publications

References 4 publications

Balanço de água no volume de solo explorado pelo sistema radicular de uma planta de citros

Balanço de água no volume de solo explorado pelo sistema radicular de uma planta de citros

Determining Soil Hydraulic Properties

Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions

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