Evaluation of Analytical Methods to Study Aquifer Properties with Pumping Tests in Coastal Aquifers with Numerical Modelling (Motril-Salobreña Aquifer)

Calvache, María Luisa; Sánchez-Úbeda, Juan Pedro; Duque, Carlos; López-Chicano, M.; Torre, Beatriz De la

doi:10.1007/s11269-015-1177-6

Cited by 20 publications

(9 citation statements)

References 48 publications

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“…Although flow patterns with vertical upward components have been studied in other parts of the Motril-Salobreña aquifer [33,53], but in this study we did not identify these patterns. The explanation could be due to the shallow depth of the wells and the lagoons and therefore, the regional discharge of the aquifer to the coast did not impact the water level measurements neither the groundwater-surface water interactions.…”

Section: Discussionmentioning

confidence: 58%

Groundwater-Surface Water Interactions in “La Charca de Suárez” Wetlands, Spain

Blanco-Coronas

López-Chicano

Calvache

et al. 2020

Water

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La Charca de Suárez (LCS) is a Protected Nature Reserve encompassing 4 lagoons located 300 m from the Mediterranean coast in southern Spain. LCS is a highly anthropized area, and its conservation is closely linked to the human use of water resources in its surroundings and within the reserve. Different methodologies were applied to determine the hydrodynamics of the lagoons and their connection to the Motril-Salobreña aquifer. Fieldwork was carried out to estimate the water balance of the lagoon complex, the groundwater flow directions, the lagoons-aquifer exchange flow and the hydrochemical characteristics of the water. The study focussed on the changes that take place during dry-wet periods that were detected in a 7-month period when measurements were collected. The lagoons were connected to the aquifer with a flow-through functioning under normal conditions. However, the predominant inlet to the system was the anthropic supply of surface water which fed one of the lagoons and produced changes in its flow pattern. Sea wave storms also altered the hydrodynamic of the lagoon complex and manifested a future threat to the conservation status of the wetland according to predicted climate change scenarios. This research presents the first study on this wetland and reveals the complex hydrological functioning of the system with high spatially and temporally variability controlled by climate conditions and human activity, setting a corner stone for future studies.

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Section: Discussionmentioning

confidence: 58%

Groundwater-Surface Water Interactions in “La Charca de Suárez” Wetlands, Spain

Blanco-Coronas

López-Chicano

Calvache

et al. 2020

Water

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“…The first experiment is a linear inverse problem involving straight‐ray travel time tomography. The remaining examples involve a groundwater pumping test with constant drawdown in which the horizontal hydraulic conductivity of the aquifer is estimated from pressure and hydraulic conductivity observations (Calvache et al, ; Yeh & Wang, ; Zech et al, ; Zhu & Yeh, ). For the pumping tests, three separate examples with alluvial/fluvial channel connectivity patterns in a 2‐D layer of an aquifer are discussed.…”

Section: Numerical Experiments and Resultsmentioning

confidence: 99%

Discrete Regularization for Calibration of Geologic Facies Against Dynamic Flow Data

Khaninezhad

Golmohammadi

Jafarpour

2018

Water Resources Research

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Subsurface flow model calibration involves many more unknowns than measurements, leading to ill‐posed problems with nonunique solutions. To alleviate nonuniqueness, the problem is regularized by constraining the solution space using prior knowledge. In certain sedimentary environments, such as fluvial systems, the contrast in hydraulic properties of different facies types tends to dominate the flow and transport behavior, making the effect of within facies heterogeneity less significant. Hence, flow model calibration in those formations reduces to delineating the spatial structure and connectivity of different lithofacies types and their boundaries. A major difficulty in calibrating such models is honoring the discrete, or piecewise constant, nature of facies distribution. The problem becomes more challenging when complex spatial connectivity patterns with higher‐order statistics are involved. This paper introduces a novel formulation for calibration of complex geologic facies by imposing appropriate constraints to recover plausible solutions that honor the spatial connectivity and discreteness of facies models. To incorporate prior connectivity patterns, plausible geologic features are learned from available training models. This is achieved by learning spatial patterns from training data, e.g., k‐SVD sparse learning or the traditional Principal Component Analysis. Discrete regularization is introduced as a penalty functions to impose solution discreteness while minimizing the mismatch between observed and predicted data. An efficient gradient‐based alternating directions algorithm is combined with variable splitting to minimize the resulting regularized nonlinear least squares objective function. Numerical results show that imposing learned facies connectivity and discreteness as regularization functions leads to geologically consistent solutions that improve facies calibration quality.

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“…This research mainly focuses on an aquifer system consisting of several micro-confined and confined aquifers. Considering the complexity of the hydrogeology and the limitations of the analytical methods, the numerical method is more reliable and recognized for parameter estimation [47][48][49][50]. In this study, a three-dimensional numerical model is developed in Visual Modflow [51] for groundwater drawdown calculation.…”

Section: Parameter Estimation Using Numerical Methodsmentioning

confidence: 99%

Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer

Zhang

et al. 2019

JMSE

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The coastal micro-confined aquifer (MCA) in Shanghai is characterized by shallow burial depth, high artesian head, and discontinuous distribution. It has a significant influence on underground space development, especially where the MCA is directly connected with deep confined aquifers. In this paper, a series of pumping well tests were conducted in the MCA located in such area to investigate the dewatering-induced groundwater fluctuations and stratum deformation. In addition, a numerical method is proposed for the estimation of hydraulic parameter, and an empirical prediction method is developed for dewatering-induced ground settlement. Test results show that groundwater drawdowns and soil settlement can be observed not only in MCA but also in the aquifers underneath it. This indicates that there is a close hydraulic connection among each aquifer. Moreover, the distributions and development of soil settlement at various depths are parallel to those of groundwater drawdowns in most areas of the test site except the vicinity of pumping wells, where collapse-induced subsidence due to high-speed flow may occur. Furthermore, the largest deformation usually occurs at the top of the pumping aquifer instead of the ground surface, because the top layer is expanded due to the stress arch formed in it. Finally, the proposed methods are validated to be feasible according to the pumping well test results and can be employed to investigate the responses of groundwater fluctuations and stratum deformations due to dewatering in MCA.

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Evaluation of Analytical Methods to Study Aquifer Properties with Pumping Tests in Coastal Aquifers with Numerical Modelling (Motril-Salobreña Aquifer)

Cited by 20 publications

References 48 publications

Groundwater-Surface Water Interactions in “La Charca de Suárez” Wetlands, Spain

Groundwater-Surface Water Interactions in “La Charca de Suárez” Wetlands, Spain

Discrete Regularization for Calibration of Geologic Facies Against Dynamic Flow Data

Experimental Study and Estimation of Groundwater Fluctuation and Ground Settlement due to Dewatering in a Coastal Shallow Confined Aquifer

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