Preliminary results of a 3-D groundwater flow model in an arid region of NE Algeria using PMWin: the Inféro-flux phreatic aquifer (Biskra)

Arras, Claudio; Sy, Mohamedou Baba; Buttau, Cristina; Carletti, Alberto; Afrasinei, Gabriela Mihaela; Ghiglieri, Giorgio

doi:10.3301/rol.2016.82

Cited by 5 publications

(4 citation statements)

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“…Recent Quaternary is represented by the deposits of silts and the "loess of Matmata", which are very fine detrital particles. These deposits could represent the main source of fine wind-blown material that can accumulate in deep valleys and wadi alluviums as semi-consolidated deposits (Arras et al, 2014(Arras et al, , 2016 or over vast areas in the Jeffara-Medenine plain as non-consolidated deposits. Since these deposits are often found in arable lands, they are constantly reworked (mouldboard ploughing), thus contributing to a further in situ sand production.…”

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Afrasinei

Melis

Arras

et al. 2018

European Journal of Remote Sensing

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Aeolian processes in drylands often transcend into sand encroachment, a common form of land degradation. Highly reflective desert features, hence sandy areas, often cause spectral confusion, and mapping through remote sensing techniques can be challenging. This work aims at designing an efficient classification method that minimises spectral confusion of desert features, hence two types of sandy areas. Moreover, we employ land cover (LC) change detection over the last 30 years. The extraction and spatiotemporal variations of LC and sand encroachment areas in the Dahar-Jeffara Medenine site (southeastern Tunisia) are assessed by employing Landsat imagery (1984 and 2014), a 30 m digital elevation model of Shuttle Radar Topography Mission (SRTMGL 1 arc second), field data and X-ray diffraction analyses of sand samples. Five new spectral indices were designed and employed in a Decision Tree (DT) classifier for the extraction of 11 LC classes, including two different types of sandy areas. The DT map yielded an overall accuracy of around 89%. Change detection results showed substantial change in several landscape components and an increase of sand units by 29% within the Jeffara-Medenine plain over the last three decades. Geomorphological observations and multi-temporal, spectral and mineral analyses indicate a main, possible in-situ source area of sand. ARTICLE HISTORY

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Section: Geological and Geomorphological Settingmentioning

confidence: 99%

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Afrasinei

Melis

Arras

et al. 2018

European Journal of Remote Sensing

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“…Piezometric levels appear rather low for medium depth boreholes located in the central part and shallow boreholes located in the South. According to piezometers located in the North-west and the South-west of Biskra, the piezometric level in the Mio-Pliocene and Lower Eocene aquifers which host the semi-deep aquifers is slightly decreased (ANRH, 2008;Drouiche et al, 2011;Arras et al, 2017). Due to the high pumped rate flows, these overexploited areas were specifically identified around piezometric depressions.…”

Section: Hydrogeological Correlationmentioning

confidence: 99%

Hydrogeological characterization of the Complex Terminal aquifer using geoelectrical investigation in the arid environment of Chetma-Biskra (South-East of Algeria)

Kessasra

Mezerreg²,

Dehibi³

et al. 2023

AS-ITJGW

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As a transition hydrogeological area, Biskra (Algeria) holds large groundwater resources in deeply buried aquifers such as the Complex Terminal. Due to a growing demand of drinking water supply and irrigation combined to low recharge, this arid region is facing an acute shortage of water and hence, the need for groundwater investigation. We used an integrated approach including geophysical investigation correlated to the geological and hydrogeological context in the Chetma area. The results highlight a deep structural form with significant hydrogeological features. In fact, two resistant limestone anticlines called Droh corresponding to a piezometric dome and a syncline filled with conductive deposit materials were identified. The Maastrichtian formation, consisting of fractured limestone, about 200 to 350 m thick, together with Lower Eocene marl limestone and limestone form a complex aquifer. At more than 400 m depth, boreholes capturing Maastrichtian limestone offer a high yield ranging from 25 to 90 L/s. Moreover, groundwater yield provides an average of 40 L/s at 300 m of depth. In contrast, synform geometries with high clay and marl content offer a weak groundwater yield. We confirmed the occurence of fractured aquifers which could constitute potentially groundwater production zones. This study provides new insights to enhance groundwater pumping for domestic and irrigation purposes for 2030.

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“…The irrigated area of around 70,000 ha has been reported to require the drawing of more than 600 million m 3 per year (NRD WADIS-MAR 2011). Various studies have focused on obtaining qualitative and quantitative parameters of these aquifers, some of which have employed up-to-date approaches of three-dimensional (3D) modeling, bringing to the attention of endusers their limited and fragile features (Buttau et al 2013;Da Pelo et al 2015;Arras et al 2016).…”

Section: Study Sites Wadi Biskra Study Area Algeriamentioning

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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Preliminary results of a 3-D groundwater flow model in an arid region of NE Algeria using PMWin: the Inféro-flux phreatic aquifer (Biskra)

Cited by 5 publications

References 0 publications

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Hydrogeological characterization of the Complex Terminal aquifer using geoelectrical investigation in the arid environment of Chetma-Biskra (South-East of Algeria)

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

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