Modeling Groundwater Flow in Unconfined Aquifers

Nath, Shivendra

doi:10.1007/978-3-319-05657-9_9

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…Two‐dimensional solutions for rectangular (and sometimes circular) infiltration basins feeding unconfined aquifers with horizontal bases have been common tools for approximating spatiotemporal properties of mounds (Hantush ; Marino ; Bochever ; Manglik and Rai , ; Rai and Singh ; Bouwer ; Rai ; Zlotnik ; Ghosh et al ). For MAR applications in aquifers with sloping bases, such solutions are absent, although both nonlinear and linearized groundwater flow equations have been explored in theoretical studies of aquifer responses, largely in steady‐state or one‐dimensional systems (e.g., Troch et al ; Brutsaert ; Basha and Maalouf ; Chapman ; Bogaart et al , Bansal et al ).…”

Section: Introductionmentioning

confidence: 99%

Estimating Groundwater Mounding in Sloping Aquifers for Managed Aquifer Recharge

2017

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Design of managed aquifer recharge (MAR) for augmentation of groundwater resources often lacks detailed data, and simple diagnostic tools for evaluation of the water table in a broad range of parameters are needed. In many large-scale MAR projects, the effect of a regional aquifer base dip cannot be ignored due to the scale of recharge sources (e.g., wadis, streams, reservoirs). However, Hantush's (1967) solution for a horizontal aquifer base is commonly used. To address sloping aquifers, a new closed-form analytical solution for water table mound accounts for the geometry and orientation of recharge sources at the land surface with respect to the aquifer base dip. The solution, based on the Dupiuit-Forchheimer approximation, Green's function method, and coordinate transformations is convenient for computing. This solution reveals important MAR traits in variance with Hantush's solution: mounding is limited in time and space; elevation of the mound is strongly affected by the dip angle; and the peak of the mound moves over time. These findings have important practical implications for assessment of various MAR scenarios, including waterlogging potential and determining proper rates of recharge. Computations are illustrated for several characteristic MAR settings.

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Section: Introductionmentioning

confidence: 99%

Estimating Groundwater Mounding in Sloping Aquifers for Managed Aquifer Recharge

2017

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An approximate analytical solution for groundwater variation in unconfined aquifers subject to variable boundary water levels and groundwater recharge

Wang,

Wu,

Hsieh

2024

MATH

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<p>This study investigated the effects of fluctuating boundary water levels and surface recharge on groundwater flow within unconfined aquifers. We aimed to understand how changes in recharge patterns and variable boundary water levels, such as those from rivers or canals, affect groundwater levels over time and space. To achieve this, we solved the linearized Boussinesq equation using the time-marching method alongside the generalized integral transformation method. Our analysis focused on how different types of recharge affect groundwater level variations and flow dynamics. We found that boundary effects on groundwater level change propagate from the edges toward the aquifer's center, becoming more pronounced with increased boundary water levels. Over time, the system stabilizes, leading to a steady water table height and flow rate, which depend on the disparity between the boundary water levels. Our analytical model demonstrated flexibility and practical applicability by allowing for the consideration or omission of various influencing factors, thus facilitating complete knowledge about groundwater variations and offering future strategic insights for sustainable groundwater resource management.</p>

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Effectiveness Analysis of Canal Blocking in Sub-peatland Hydrological Unit 5 and 6 Kahayan Sebangau, Central Kalimantan, Indonesia

Suryadi

Soekarno

Humam

2021

J. Eng. Technol. Sci.

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The height of canal blocking has a significant influence on re-wetting peatland, depending on the canal’s distance. An effective canal in good condition has to raise the groundwater table to -0.4 m below ground level according to the Indonesian Ministry of Environment and Forestry (MENLHK). The effectiveness of different canal blockings was modeled by Freewat software with variation of canal distance (200 m, 250 m, 300 m, 350 m, and 400 m) and blocking height (0.2 m, 0.3 m, 0.4 m, 0.5 m, 0.6 m). This simulation was carried out using recharge and evapotranspiration data covering 20 years. The input of the conductivity value was done using 50 m/day according to the calibration. From the modeling, 0.6 m high canal blockings give a satisfactory result at every canal distance. The study took place during the annual dry season, when recharge was almost zero and average evapotranspiration was 6 mm/day. Adjusting the canal blocking to a maximum of 0.6 m and the canal distance to 400 m, the groundwater table slowly rose 0.38 m and it took 30 days to reach full-re-wetting capacity. This study revealed that the effectiveness of canal blocking is directly related to evapotranspiration and recharge, which has a positive correlation with the groundwater rise and the re-wetting period.

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Modeling Groundwater Flow in Unconfined Aquifers

Cited by 3 publications

References 32 publications

Estimating Groundwater Mounding in Sloping Aquifers for Managed Aquifer Recharge

Estimating Groundwater Mounding in Sloping Aquifers for Managed Aquifer Recharge

An approximate analytical solution for groundwater variation in unconfined aquifers subject to variable boundary water levels and groundwater recharge

Effectiveness Analysis of Canal Blocking in Sub-peatland Hydrological Unit 5 and 6 Kahayan Sebangau, Central Kalimantan, Indonesia

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