Comparative analysis of different boundary conditions and their influence on numerical hydrogeological modeling of Palmital watershed, southeast Brazil

Coelho, Clívia Dias; Faria, Agnes Caroline S.; Marques, Eduardo Antônio Gomes

doi:10.1016/j.ejrh.2017.05.006

Cited by 15 publications

(7 citation statements)

References 6 publications

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“…According to the solute transport results, the solute concentration filtered from the bottom of the aeration zone is taken as the vertical infiltration concentration [33,34] of the numerical model of Visual MODFLOW groundwater flow. The Hydrus-1D aeration zone model is divided into 16 regions for simulation, and the solute concentration at the bottom of each zone is different, so the solute transport model is divided into 16 regions with the input vertical infiltration concentration.…”

Section: • Vertical Penetration Concentrationmentioning

confidence: 99%

Study on the Contribution of Groundwater Nitrogen Pollution Sources in a Typical Section of the Wei River in China

Li,

Liu,

et al. 2024

Water

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Aiming to assess the groundwater nitrogen pollution problem in a typical section of the Wei River in China, the contribution of groundwater nitrogen pollution sources in the region was studied. Using Hydrus-1D to implement the simulation process of substituting points for surfaces, we calculated the volume and nitrogen concentration of the water leaching out from the bottom of the encompassing aeration zone. The results of the Hydrus-1D simulation were input as initial values into the nitrogen migration and transformation numerical model constructed using Visual MODFLOW to integrate the simulation calculations between the surface, the aeration zone, and the aquifer system. In addition, the contribution rates of different groundwater nitrogen pollution sources were calculated using the equilibrium formula combined with the groundwater nitrogen test results. The simulation results showed that the groundwater nitrogen in the southern part of the Wei River comes from two main sources: vertical infiltration and river recharge. Specifically, ammonia nitrogen vertical infiltration and river recharge contribute 95.82% and 4.18%, respectively; nitrite nitrogen vertical infiltration and river recharge contribute 92.41% and 7.59%; and nitrate nitrogen vertical infiltration and river recharge contribute 94.26% and 5.74%. According to the simulation results, an increase in the intensity of surface water pollution control is required in the study area. It is also necessary to control the use of nitrogen fertiliser on farmland in the study area and improve the utilisation rate of nitrogen fertiliser to reduce the nitrogen pollution loads from these sources.

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Section: • Vertical Penetration Concentrationmentioning

confidence: 99%

Study on the Contribution of Groundwater Nitrogen Pollution Sources in a Typical Section of the Wei River in China

Li,

Liu,

et al. 2024

Water

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“…In the conceptual model, the boundaries of the region are extended to obtain reasonable boundary conditions for the numerical model. Since the shallow groundwater of the Cebala perimeter belongs to a large catchment and is in interaction with the neighbouring aquifer systems, the definition of a reliable hydrogeological boundary condition is not feasible (Coelho et al, 2017;Follin & F I G U R E 2 Lithostratigraphic crosssections through Cebala perimeter Grundtenik, 1999;Frick et al, 2019;Woessner & Poeter, 2020). Thus, the modelled region was extended from the administrative boundaries of the perimeter in the west to the Mediterranean Sea in the east, and from the Medjerda River from the north to the piedmonts of the Nahli Mountain in the southern part.…”

Section: Model Setupmentioning

confidence: 99%

Groundwater modelling of a shallow aquifer for the assessment of water logging: A case study of the Cebala‐Borj Touil irrigation perimeter, northern Tunisia

Rzigui

Bogacki

Hörmann

et al. 2022

Irrigation and Drainage

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The Cebala-Borj Touil (Cebala) Plain in Tunisia is a large perimeter with an area of 3,200 ha. In 1990, a drainage and irrigation system was installed. The groundwater system is complex due to the proximity to the sea, the low slope, and the low performance of natural drainage. It is characterized by shallow groundwater and soil water logging. The flooded area is controlled by natural and artificial factors. The natural parameters are the flat slope and the soil texture. The man-made problems are caused by inappropriate irrigation and drainage deficiency. The numerical groundwater flow simulation model FEFLOW (Finite Element Subsurface Flow System) was used to simulate the groundwater depth variability. The calculated water table depth ranged from less than 0.5 m from the ground surface to more than 8 m. Based on the calibrated model, several management scenarios were investigated to study the possibilities to mitigate the problem of water logging in the perimeter. The model results showed that improving the drainage efficiency and reducing the irrigation amounts could solve the water logging problem, but not entirely. For the low flooded parts, a pumping option could be considered. The final management scheme might include the combination of all the tested management scenarios.

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“…Along the vertical direction, the model was built considering two layers with equal thicknesses and was run in a steady state condition considering an unconfined aquifer. The boundary conditions were defined according to the physical, hydraulic and hydrogeological features of the modeled area [39].…”

Section: Conceptual and Numerical Model Of Caposele Aquifermentioning

confidence: 99%

A Steady-State Model to Simulate Groundwater Flow in Unconfined Aquifer

et al. 2020

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The hydraulic and hydrogeological features of the Caposele aquifer have been investigated by using a numerical groundwater flow model. In particular, groundwater flow simulations were performed for a multilayered, unconfined aquifer in steady-state conditions for different thicknesses of the aquifer’s saturated zone. The Caposele groundwater model was carried out starting from a generic model drained by a unique spring outlet in accordance with the geo-hydrological features of the study area. The conceptual model was built considering hydrogeological features of spring catchment, and was then implemented with the MODFLOW numerical code. A combined 2D-3D approach was adopted, and the model was calibrated on borehole data available for the time period 2012–2019. Different thicknesses of the aquifer were set, and a reliable relationship was found between the hydraulic head, saturated zone and hydraulic conductivity of the aquifer. Using the MODPATH package, the mean travel time (Darcian) of groundwater was computed for five different scenarios, corresponding to the model’s depths; the analysis that was performed shows that the travel time is higher for a greater and lower for a smaller thickness of the aquifer’s saturated zone, respectively. The Caposele aquifer model was zoned in different sectors, named flow pipe areas, that play different roles in groundwater recharge-discharge processes. A vector analysis was also carried out in order to highlight the ascendant flow near the spring zone.

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Comparative analysis of different boundary conditions and their influence on numerical hydrogeological modeling of Palmital watershed, southeast Brazil

Cited by 15 publications

References 6 publications

Study on the Contribution of Groundwater Nitrogen Pollution Sources in a Typical Section of the Wei River in China

Study on the Contribution of Groundwater Nitrogen Pollution Sources in a Typical Section of the Wei River in China

Groundwater modelling of a shallow aquifer for the assessment of water logging: A case study of the Cebala‐Borj Touil irrigation perimeter, northern Tunisia

A Steady-State Model to Simulate Groundwater Flow in Unconfined Aquifer

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