Flow to horizontal drains in isotropic unconfined aquifers

Samani, Nozar; Kompani-Zare, Mazda; Seyyedian, H.; Barry, David Andrew

doi:10.1016/j.jhydrol.2005.10.003

Cited by 17 publications

(11 citation statements)

References 35 publications

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“…A Fourier and Laplace methodsbased diagnostic answer for the subsurface stream to horizontal wells in unconfined and confined aquifers was presented by Zhan and Zlotnik (2002). The work of Zhan and Zlotnik was extended by Samani et al (2006) to achieve the solution of a constant-head horizontal drain. The relationship between discharge of a tile drain and its spacing and depth has been evaluated by using a number of numerical and analytical solutions/expressions, such as Çimen (2008), Castanheira and Santos (2009), Youngs (2013) and Henine et al (2014), among others.…”

Section: Numerical and Analytical Solutionsmentioning

confidence: 99%

“…The work of Zhan and Zlotnik was extended by Samani et al . (2006) to achieve the solution of a constant‐head horizontal drain. The relationship between discharge of a tile drain and its spacing and depth has been evaluated by using a number of numerical and analytical solutions/expressions, such as Çimen (2008), Castanheira and Santos (2009), Youngs (2013) and Henine et al .…”

Section: Numerical and Analytical Solutionsmentioning

confidence: 99%

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Salinization and drainage problems of agricultural land

Singh

2020

Irrigation and Drainage

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The extension of irrigated agriculture is essential to fulfilling the mounting demand for food and fibre from a growing population which is anticipated to reach about 10 billion individuals in 2050. Lacking the necessary drainage, this extension can bring about salinization issues in irrigated regions. Continuous irrigation over many years with no adequate drainage services has led to huge agricultural regions becoming unproductive. Salinization problems linked to poor drainage are widespread in agricultural zones over the world. The aforementioned drainage-related salinization issues in agricultural land have been solved by using various methods and techniques. This paper presents an assessment of some non-conventional methods and strategies utilized for dealing with salinization and drainage issues of irrigated land. An indication of the drainage and salinization issues of irrigated areas and the significance of the study are given. Reasoning and foundation of the issues are presented. Numerical and analytical solutions of the problems are described. The drainage water management technique for managing nutrient losses from a drainage system is discussed. The analysis revealed that conjunctive water use with an increased groundwater proportion can to some extent manage the salinization and root-zone submergence problems of irrigated areas. K E Y W O R D S agricultural sustainability, conjunctive water use, drainage of irrigated land, drainage water management, land salinization Résumé L'extension de l'agriculture irriguée est essentielle pour répondre aux demandes croissantes de nourriture et de fibres pour la population croissante qui devrait contacter une dizaine de milliards d'individus en 2050. Sans des conditions de drainage adaptées, cette extension peut entraîner des problèmes de salinisation dans les régions irriguées. L'irrigation continue pendant de nombreuses années sans services de drainage adéquats a provoqué l'impossibilité à produire pour de vastes régions agricoles. Les problèmes de salinisation liés au mauvais drainage sont répandus dans les zones agricoles du monde entier. Les problèmes de salinisation des terres agricoles liés au * Problèmes de salinisation et de drainage des terres agricoles

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Section: Numerical and Analytical Solutionsmentioning

confidence: 99%

Section: Numerical and Analytical Solutionsmentioning

confidence: 99%

Salinization and drainage problems of agricultural land

Singh

2020

Irrigation and Drainage

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“…The second assumption for specifying the boundary along the horizontal well screens is the constant-head condition. For example, Samani et al [241] modified the solution for the horizontal uniform-flux well developed by Zhan and Zlotnik [81] to obtain a Laplace-domain solution for horizontal drains in an anisotropic unconfined aquifer. They also provided the type curves and discharge to a horizontal drain computed by using the Stehfest method to invert the Laplace-domain solution.…”

Section: Analytical and Semi-analytical Methodsmentioning

confidence: 99%

“…They also provided the type curves and discharge to a horizontal drain computed by using the Stehfest method to invert the Laplace-domain solution. The analytical or semi-analytical solutions developed for flow in horizontal wells can also be grouped according to the type of aquifers, such as confined aquifers [239,242,243], leaky aquifers [117,244,245], and unconfined aquifers [81,85,240,241]. Some studies are also concerned with a variety of problems associated with the flow to horizontal wells such as gas or vapor flow [246,247].…”

Section: Analytical and Semi-analytical Methodsmentioning

confidence: 99%

Recent advances in modeling of well hydraulics

Yeh¹,

Chang²

2013

Advances in Water Resources

124

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“…The authors also showed that a combined drainage system (tube wells and a horizontal drain) is more effective at maintaining water table levels. Samani et al (2006) developed analytical solutions to a drainage problem and provided computational algorithms that can be used to calculate drawdown and discharge to horizontal drains. The software works in a Laplace domain and then translates the results to real time.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of granular filter under the bed of a canal

2019

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To protect canal beds against erosion and to prevent seepage from the bottom or side of a canal, impermeable linings are often used. These linings can suffer from several problems including damage due to uplift pressure when the groundwater table is high. Thus, it is necessary to provide a drainage system under the hard lining of the canal to reduce the water pressure, especially at the end of the operation season, when the canal is empty. This work evaluates the performance of a drainpipe with a filter envelope located under the bed of canal. The solution method uses the finite element method to analyze and minimize uplift force. Various combinations of drain diameters, envelop thicknesses, depths of drain under the canal invert, and groundwater surfaces are considered. Simulation results indicate that with increasing drain diameter and depth of drain under the bed of canal, the groundwater surface declines and the uplift force is reduced. The use of a filter envelope around the drainpipe for decreasing hydrostatic pressure is found to be effective. Linear and nonlinear regression equations for predicting the pressure head in canal bed centerline are provided. Keywords Canal • Drainage system • Granular filter • Groundwater head • Uplift List of symbols D Diameter of drain H Water level above the bedrock K f Hydraulic conductivity of filter K s Hydraulic conductivity of soil l Length of the drainage P Pressure head R 2 Determination coefficient RMSE Root mean square error t Thickness of filter V Velocity of flow Y Drain elevation from bedrock to middle of drain ∆h Total head loss γ w Unit weight of water

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Flow to horizontal drains in isotropic unconfined aquifers

Cited by 17 publications

References 35 publications

Salinization and drainage problems of agricultural land

Salinization and drainage problems of agricultural land

Recent advances in modeling of well hydraulics

Numerical investigation of granular filter under the bed of a canal

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