Relationship between tectonic structures and hydrogeochemical compartmentalization in aquifers: Example of the “Jeffara de Medenine” system, south–east Tunisia

Chihi, Hayet; Marsily, Ghislain de; Belayouni, Habib; Yahyaoui, Houcine

doi:10.1016/j.ejrh.2015.07.004

Cited by 23 publications

(12 citation statements)

References 15 publications

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“…These are also spread within the Jeffara Plain, especially where irrigated perimeters are, mostly along the Koutine-Medenine area or west and south-west of Medenine. This is may be argued through the presence of the faults' system in the area (Koutine-Medenine main one) which favors an intense exploitation of high-salinity groundwater (Chihi et al 2015) used for irrigation, among other usages. The presence of many wells along this alignment induces a rather high concentration of irrigated fields in this area.…”

Section: Change Detection and Driving Factorsmentioning

confidence: 99%

Classification methods for detecting and evaluating changes in desertification-related features in arid and semiarid environments

Afrasinei

Melis

Buttau

et al. 2017

Euro-Mediterr J Environ Integr

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Land cover, land use, soil salinization, and sand encroachment, which are desertification-indicating features, were integrated in a diachronic assessment, obtaining quantitative and qualitative information on the ecological state of the land, particularly degradation tendencies. In arid and semi-arid study areas of Algeria and Tunisia, sustainable development requires the understanding of these dynamics as it withstands the monitoring of desertification processes. Both visual interpretation and automated classification approaches have been set up for salt and sand features extraction using historical and present Landsat imagery. The automated one includes a decision tree classifier and an unsupervised classification applied to the principal components extracted from Knepper ratios composite. New spectral indices are employed in the decision tree classifier for the extraction of features of interest. The validation of the classification methods showed that the decision tree had an overall accuracy over 85% in both areas. Integrating results with ancillary spatial data, we could identify driving forces and estimate the metrics of desertification processes. In the Biskra area (Algeria), it emerged that the expansion of irrigated farmland in the past three decades has been contributing to an ongoing secondary salinization of soils, with an increase of over 75%. In the Oum Zessar area (Tunisia), there has been substantial change in several landscape components in the last decades related to increased anthropic pressure and settlement, agricultural policies, and national development strategies. One of the most concerning aspects is the expansion of sand-encroached areas over the last three decades of around 27%.

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Section: Change Detection and Driving Factorsmentioning

confidence: 99%

Classification methods for detecting and evaluating changes in desertification-related features in arid and semiarid environments

Afrasinei

Melis

Buttau

et al. 2017

Euro-Mediterr J Environ Integr

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“…49 boreholes were also used for lithostratigraphic correlation, to construct seventeen geological cross-sections (Fig. 4) and to interpret the small-scale faults [4,14]. This faulting system splits the study area into horst and graben blocks and engenders a global downtilting with important lateral facies and thickness variations toward the northeast direction.…”

Section: Geology Outlinesmentioning

confidence: 99%

“…A thorough stratigraphic and structural framework reconstruction of the study area was accomplished in order to highlight the existing relations between the aquifer system units [4,[13][14].…”

Section: Geology Outlinesmentioning

confidence: 99%

“…The most significant water reservoirs are hosted within the Jurassic, Albo-Aptian, Turonian and Senonian series (Fig. 2) [1][2][3][4]. The Mio-Plio-Quaternary geological cover lies directly over these aquifer formations by means of an erosional contact [5][6].…”

Section: Geology Outlinesmentioning

confidence: 99%

“…The basic tool for spatial correlation analysis is the experimental variogram function [16][17][18][19], which characterizes the spatial structure of the regionalized variable ܼሺ‫ݔ‬ሻ: To be used in the kriging interpolations, the experimental variogram requires fitting by a theoretical definite positive function, taking into account the context of the local and regional geology and the number and the spatial distribution of the available data [13,4,[19][20][21][22][23][24]. The theoretical model of the spatial variability is then used to estimate the random variables' "depth" ("Jurassic Horizon", "Cenomanian Horizon", "Turonian Horizon" and the "Senonian Horizon") at unsampled locations.…”

Section: B Variographic Analysismentioning

confidence: 99%

See 2 more Smart Citations

A Constrained Geostatistical Approach for Efficient Multilevel Aquifer System Characterization

Chihi¹,

Marsily²,

Bourges³

et al. 2016

JWRHE

Self Cite

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Abstract-In this study, the problems of parameter estimation for systems with scarce measurements are examined. In this case, an original geostatistical methodology is applied to generate bathymetric surface models of a faulted aquifer system within the Jeffara Basin in southeastern Tunisia. The modelling workflow is based on i) the spatial analysis of the data configuration and ii) the conceptual stacking pattern. This allows provision of key concepts and geostatistical approaches to be undertaken during geomodelling procedures. In fact, two constraints have been integrated: i) inequality data provided by the end of the boreholes and ii) the faults that compartmentalize the aquifer system. First, kriging with inequality was used for depth estimation of the Turonian reservoir Top. The results are compared with those from classical kriging and evaluated through the estimation quality, the adopted assumptions and the method limitations. Validation analyses show that the model developed with the inequality data leads to a significant gain in mapping accuracy and geological realism. In the second step, the geostatistical approach was used to model the successive bounding surfaces of the aquifer system units. Consequently, the kriging constrained by inequality data could be applied in a variety of hydrogeological parameters interpolations to provide significantly better informative maps that are useful for hydrodynamic modelling.

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Effects of coal mining on the evolution of groundwater hydrogeochemistry

Qiao

Zhang

et al. 2019

Hydrogeol J

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Relationship between tectonic structures and hydrogeochemical compartmentalization in aquifers: Example of the “Jeffara de Medenine” system, south–east Tunisia

Cited by 23 publications

References 15 publications

Classification methods for detecting and evaluating changes in desertification-related features in arid and semiarid environments

Classification methods for detecting and evaluating changes in desertification-related features in arid and semiarid environments

A Constrained Geostatistical Approach for Efficient Multilevel Aquifer System Characterization

Effects of coal mining on the evolution of groundwater hydrogeochemistry

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