A simple numerical analyses software for predicting water table height in subsurface drainage

Castanheira, Paulo Jorge; Santos, Francisco L.

doi:10.1007/s10795-009-9079-5

Cited by 12 publications

(12 citation statements)

References 12 publications

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“…The vadose zone is not always considered a major storage component of the hydrological cycle because it holds only a minute fraction of the earth's fresh water as investigated by [1]. Vadose zone flow according to [2] is fundamentally complicated by non-linearity and by interference of unsaturated hydraulic properties and also sensitive to material and hydraulic conditions. Predicting the movement of water flow rates and substrates removal within this zone has applications in fields of hydrology, agriculture and soil engineering [2] and is critical to infiltration, runoff, erosion, plant growth, aquifer recharge and discharge to surface [2].…”

Section: Introductionmentioning

confidence: 99%

“…Vadose zone flow according to [2] is fundamentally complicated by non-linearity and by interference of unsaturated hydraulic properties and also sensitive to material and hydraulic conditions. Predicting the movement of water flow rates and substrates removal within this zone has applications in fields of hydrology, agriculture and soil engineering [2] and is critical to infiltration, runoff, erosion, plant growth, aquifer recharge and discharge to surface [2]. The vadose zone according to [3] is an intrinsic part of the hydrological cycle essentially controlling the interrelationship between precipitation, infiltration, surface runoff, evaporation and ground water recharge.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of vertical water flow through vadose zone

2018

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Simulation of vertical water flow representing the release of water from the vadose zone to the aquifer of surroundings within Nigerian Defence Academy (34km 2) for a sustainable ground water resources management was carried out using Advanced Simulation and Modelling of Urban Ground Water Management (UGROW model).Rainfall data, soil moisture and runoff coefficient are specified as input data into the model. Basic component of the vertical water balance (precipitation, leakages, evaporation and runoff)was observed. From the results, 4.0cm/day of average leakage observed for the period 1991-2001 was the maximum leakage for the simulation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of vertical water flow through vadose zone

2018

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“…Water near the trench will be intercepted and collected by the high-permeability filler and then be discharged by the pipe. The effect of subsurface drain is widely investigated by numerical method (Castanheira and Santos 2009). …”

Section: Introductionmentioning

confidence: 99%

Controlling of Moisture in Subgrade Backfilling Sand

Cao¹,

Luo²

2017

dtetr

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Moisture content in the sub grade will be affected by the external water level or rain after the moisture of sub grade reach to the equilibrium. According to the unsaturated flow, two-dimensional finite element method models of sub grade were established. Slope protection and blind drainage was used to study the influence to moisture of sub grade of backfill sand, the results indicate that the combination of slope protection and blind drainage was an optimal method, which can effectively reduce the moisture of sub grade.

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“…Para o movimento de fluxo permanente se destacam as equações de Hooghoudt e Ernest e fluxo não permanente, as equações de GloverDumm, Glover, Boussinesq-Glover, Hammad, Tapp-Moody, Schilfgaarde & Kirkham (Duarte et al, 2001;Castanheira & Santos, 2009). E tanto as equações de fluxo permanente quanto a variável, são baseadas nas mesmas suposições, ou seja, no princípio de Dupuit-Forchheimer.…”

Section: Introductionunclassified

Equações obtidas a partir das leis de conservação para dimensionamento de drenos subterrâneos

Souza

Rodrigues

Levien

2014

Rev. bras. eng. agríc. ambient.

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R E S U M ONeste trabalho se obteve uma expressão algébrica para o modelo de Dumm através do qual se descrevem suas soluções por meio de algoritmo geométrico. Utilizaram-se as técnicas de identificação de padrões potenciais, hiperbólicos, lineares e exponenciais, por intermédio de representações em gráficos monolog e dilog visando definir estratégias de ajuste pela técnica dos mínimos quadrados, sentido em que foram analisados diversos modelos e se identificou que os modelos do tipo linear e potencial ajustam muito bem a razão entre os níveis do lençol freático inicial e após t dias decorridos; além disto, a identificação de que modelos potenciais podem ajustar bem o processo, possibilitou gerar, com o uso do Solver, Office Excel da Microsoft. Inc., modelos simplificados para o problema, razão pela qual se propõe, neste estudo, o ajuste com equações empíricas do tipo potencial para representá-lo com o uso das variáveis: condutividade hidráulica, profundidade e tempo para determinar a distância entre drenos permitindo, inclusive, a descrição dessa distância sob os mesmos parâmetros que o modelo de Glover-Dumm. As soluções encontradas têm pequenas diferenças porém não significativas quanto aos modelos de Glover, Dumm e Glover-Dumm. Equations obtained from laws of conservation for design of underground drains A B S T R A C TIn this study an algebraic expression for the Dumm's model was obtained, which describes its solutions through a geometric algorithm. An algebraic expression was obtained to model the Dumm through which to describe their solutions through geometric algorithm.The techniques of identifying potential, hyperbolic, linear and exponential patterns were used, through representations in monolog and dilog aimed at defining strategies set by the technique of least squares. In this context, different models were analysed and identified that linear and potential type models adjust well to the ratio of the initial ground water table levels and days elapsed after t. Furthermore, the identification that the potential models adjust well to describe the process as well, it was possible to generate simplified models for the problem, using the Solver, Microsoft Office Excel. Inc., and for this reason, in this study, it is proposed to fit with empirical equations of potential type to represent it using the variables such as hydraulic conductivity, depth and time to determine the distance between drains, including the description of this distance under the same parameters as the model of Glover-Dumm. The solutions found present small differences but not significant compared to models Glover, Glover-Dumm and Dumm. Palavras

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A simple numerical analyses software for predicting water table height in subsurface drainage

Cited by 12 publications

References 12 publications

Simulation of vertical water flow through vadose zone

Simulation of vertical water flow through vadose zone

Controlling of Moisture in Subgrade Backfilling Sand

Equações obtidas a partir das leis de conservação para dimensionamento de drenos subterrâneos

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