排序方式： 共有55条查询结果，搜索用时 234 毫秒
11.
Application of Multivariate Statistical Techniques for Characterization of Groundwater Quality in the Coastal Aquifer of Nador,Tipaza (Algeria) 总被引：1，自引：0，他引：1
Abdelkader Bouderbala Boualem Remini Abdelamir Saaed Hamoudi Antonio Pulido-Bosch 《Acta Geophysica》2016,64(3):670-693
The study focuses on the characterization of the groundwater salinity on the Nador coastal aquifer (Algeria). The groundwater quality has undergone serious deterioration due to overexploitation. Groundwater samplings were carried out in high and low waters in 2013, in order to study the evolution of groundwater hydrochemistry from the recharge to the coastal area. Different kinds of statistical analysis were made in order to identify the main hydrogeochemical processes occurring in the aquifer and to discriminate between different groups of groundwater. These statistical methods provide a better understanding of the aquifer hydrochem-istry, and put in evidence a hydrochemical classification of wells, showing that the area with higher salinity is located close to the coast, in the first two kilometers, where the salinity gradually increases as one approaches the seaside and suggests the groundwater salinization by sea-water intrusion. 相似文献
12.
Groundwater investigation in the southern part of Gabes using resistivity sounding, southern Tunisia 总被引：2，自引：1，他引：1
Abdelkader Mhamdi Ferid Dhahri Mouez Gouasmia Nadia Inoubli Mohamed Soussi Hamed Ben Dhia 《Arabian Journal of Geosciences》2013,6(2):601-614
The groundwater hydrogeology of southern Tunisia emphasizes two main groundwater bodies so-called Zeuss-Koutine and south Gabes. These groundwater bodies yielding economically important storage of useful water present complex internal architecture and heterogeneity allowing exchange flows throughout permeable or/and fractured bodies. A geophysical survey using resistivity soundings was carried out along this area to describe in detail the field structure and the 3D extent of these groundwater bodies by the hydrogeological new data and detailed subsurface mapping based on resistivity sounding and seismic data. This survey discusses also the potentialities of some permeable layer in water storage and purposes potential favorable areas for optimum groundwater mining. 相似文献
13.
14.
Zaagane Mansour Refas Soraya Khaldi Abdelkader Frédéric Donzé Hamimed Abderahmane Safa Aissa Moussa Kacem Sebbane Abbes Azzaz Habib Mouassa Souad 《Arabian Journal of Geosciences》2016,9(14):638
The Ouarsenis area is one of the most developed karstic systems of Algeria. It is a karst reservoir drinking water with a population of more than 50,000 people taking fully benefit from it. To understand the development of this karstic system, the local tectonic history of the four main mountain ranges of this culminating area (Ouarsenis) has been analyzed. Although previously identified primarily Cenozoic tectonic activities have been observed, a set of NW-SE joints intersecting the Jurassic limestone has been associated to a post-nappes tectonic events. Moreover, numerous joint sets oriented NNE/SSW have been identified almost over the entire culminating area. These joints are the direct consequence of the following stress history: (i) a NW/SE shortening responsible for a major overlap and the first fold (P1) phase, (ii) a second NNE/SSW shortening stage responsible for the second folding (P2) phase associated with 70° N sinistral strike-slip trend, (iii) a WNW/ESE extension phase resulting from the change of σ 3 stress vertical axis, and (iv) a shearing stress creating a 120° N sinistral strike-slip fault. Only the late phases are responsible of the development of joints, which have been karstified later on. Indeed, significant families of karstified joints, i.e., 20° and 70° N have been found. These joints are related to the extensional and shearing modes, respectively, and linked to a particular in situ karstogenesis. Moreover, this study suggests an ancient establishment of the karstic systems in the Ouarsenis region in at least two stages: pre-figured and activated behaviors during the Cenozoic. 相似文献
15.
Impact of agricultural activity and lithology on groundwater quality in the Merdja area, Tebessa, Algeria 总被引：1，自引：1，他引：0
Abdelkader Rouabhia Fethi Baali Chemseddinne Fehdi 《Arabian Journal of Geosciences》2010,3(3):307-318
This work presents results of the hydrogeological and hydrochemical studies on groundwater samples from the alluvial aquifer of Merdja in Tébessa, located in the Western part of this town. Its groundwater resources are used mainly for crop irrigation in an agriculture dominated area. Hydrochemical and water quality data obtained through a sampling period (December 2008) and analysis program indicate that nitrate pollution can be a serious problem affecting groundwater due to the use of nitrogen (N) fertilizers in agriculture. The concentration of nitrate in groundwater ranged from 19 to 281 mg/l. Considerable seasonal fluctuations in groundwater quality were observed as a consequence of agricultural practices and other factors such as annual rainfall distribution and the wadi El Kebir flow regime. The chemical composition of the water is not only influenced by agricultural practices, but also by interaction with the alluvial sediments. The dissolution of evaporites accounts for part of the Na+, K+, Cl?, SO 4 2? , Mg2+, and Ca2+, but other processes, such as calcite precipitation and dedolomitization, also contribute to groundwater chemistry. 相似文献
16.
Sector-zoned phlogopites in igneous rocks 总被引：2，自引：0，他引：2
Christiane Wagner Danielle Velde Abdelkader Mokhtari 《Contributions to Mineralogy and Petrology》1987,96(2):186-191
Sector-zoned micas are described in three occurrences of igneous rocks. Basal sectors (001) and lateral sectors (010) are well defined. Analyses of probably isochronous growth points indicate that there are consistent chemical composition differences between the sectors, the (010) sector being richer in Si and poorer in Ti, Fe, Al and Ba relative to the (001) sector. Within each sector type Fe/ (Fe + Mg) increases from core to rim. These differences vary in amplitude from one occurrence to the other, but are systematic for micas with extremely different tetrahedral cations. Possible factors influencing this type of crystallization are briefly reviewed: growth rate, geometry of protosites and bulk composition of the liquid. 相似文献
17.
Abdelkader Rouabhia Fethi Baali Chemseddine Fehdi Boumezbeur Abderrahmane Boubaya Djamel 《Arabian Journal of Geosciences》2011,4(5-6):973-982
In this work, we present results of the hydrogeochemical and isotopic studies on groundwater samples from the El Ma El Abiod Sandstone aquifer, in Tébessa, Algeria. Chemical and environmental isotope data are presented and discussed in order to identify the geochemical processes and their relation with groundwater quality as well as to get an insight into the hydrochemical evaluation, in space and time, of groundwater and of the origin of dissolved species. A combined hydrogeologic and isotopic investigation have been carried out using chemical and isotopic data to deduce a hydrochemical evaluation of the aquifer system based on the ionic constituents, water types, hydrochemical facies, and factors controlling groundwater quality. All of the investigated groundwaters are categorized into two chemical types: low mineralized water type and relatively high mineralized water type. Interpretation of chemical data, based on thermodynamic calculations and geochemical reaction models of selected water groups constructed using PHREEQC, suggest that the chemical evolution of groundwater is primarily controlled by water–rock interactions, involving (1) acidic weathering of aluminosilicates, (2) dissolution of secondary carbonate minerals, and (3) cation exchange of Na+ for Ca2+. However, the original composition of groundwater may have been modified by further secondary processes such as mixing of chemically different water masses. The combined use of SI and mass-balance modeling has shown to be a useful approach in interpreting groundwater hydrochemistry in an area where large uncertainties exist in the understanding of the groundwater flow system. Interpretation of 18O and 2H, suggest that the recharge of the investigated groundwaters may result from different mechanisms. 相似文献
18.
Belkacem Bekkoussa Herve Jourde Christelle Batiot-Guilhe Mohamed Meddi Abdelkader Khaldi Habib Azzaz 《水文科学杂志》2013,58(5):1111-1127
Résumé L'origine de la salinité dans les eaux de la nappe Plio-Quaternaire de la plaine de Ghriss (Nord-Ouest de l'Algérie) et la compréhension de ses comportements hydrodynamiques et géochimiques, en réponse à certains forçages naturels et anthropiques, ont été approchées par l’étude combinée des rapports ioniques et d'analyses statistiques des données hydrochimiques. Cette étude a identifié l'alimentation latérale de l'aquifère Plio-Quaternaire par les deux principaux aquifères de la région. La salinisation des eaux de la nappe Plio-Quaternaire résulte essentiellement de la dissolution des évaporites (halite et gypse), de l'infiltration des eaux de ruissellement, et du retour à la nappe des eaux d'irrigation qui sont chargées en sels initialement reconcentrés dans le sol ou dans la zone non saturée. Les concentrations élevées en nitrates et en chlorures sont l'indice d'une pollution anthropique d'origine urbaine ou agricole qui affecte toute la plaine de Ghriss en proportions variables. Citation Bekkoussa, B., Jourde, H., Batiot-Guilhe, C., Meddi, M., Khaldi, A., et Azzaz, H., 2013. Origine de la salinité et des principaux éléments majeurs des eaux de la nappe phréatique de la plaine de Ghriss, Nord-Ouest Algérien. Hydrological Sciences Journal, 58 (5), 1111–1127. Editeur Z.W. Kundzewicz; Editeur associé S. Faye 相似文献
19.
20.
Chemical data are used to clarify the hydrogeological regime in the Merdja area in Tébessa, as well as to determine the status
of water quality in this area. Groundwater from the aquifer in the Merdja area can be divided into two major groups according
to geographical locations and chemical compositions. Water in the center part of the area of study is characterized by the
dominance of chloride, sulfate, sodium, and potassium; whereas waters in the limestone aquifers in the west are dominated
by the same cations but have higher concentrations of bicarbonate. Stable isotopes show that the Tébessa aquifers contain
a single water type, which originated in a distinct climatic regime. This water type deviates from the Global Meteoric Water
Line (MWL), as well as from the Mediterranean meteoric water line. The water is poor in tritium, and thus can be considered
generally older than 50 years. Piezometric map suggests that water is moving from the west towards the center of the studied
area, and from east towards center. Degradation of water quality can be attributed to agricultural fertilizers in most cases,
although the wadi El Kebir River is a contributor to pollution in the middle part of the studied area. 相似文献