Groundwater potentiality index: a strategically conceived tool for water research in fractured aquifers   总被引：1，自引：0，他引：1  

Said Ettazarini 《Environmental Geology》2007,52(3):477-487

Durable development requires full profit and knowledge of natural resources potentialities. Multi-criterion approaches that encompass geological, morphological, hydrological and Geographical Information System technologies are ones of exiting developments in environmental sciences. This work is a proposition of a numerical model based on a groundwater potentiality index (GPI) calculation, using data on rock fracturing, lithology, drainage, topography, rainfall and drilling water yield. It provides the ability to identify areas indicating favorable conditions for exploratory well positioning in semi-arid zones with non-permeable outcrops. It is therefore a helpful tool to assist water resources prospecting in deprived regions. The newly conceived approach has been applied in the southeastern boundary of the Bouregreg and coastal basins of Central Morocco, where Paleozoic fractured rocks outcrop. The suitability of the GPI method use was verified by comparing the GPI map values with water yield of thirteen pumping tests in a field checking area, which revealed promising results.  相似文献   

Contribution de la gravimétrie à l'étude de la structure du bassin de Tadla (Maroc) : Implications hydrogéologiques     

Abdessamad Najine  Mohammed Jaffal  Kamal El Khammari  Tahar Aïfa  Driss Khattach  Mahjoub Himi  Albert Casas  Said Badrane  Hicham Aqil 《Comptes Rendus Geoscience》2006,338(10):676-682

This study is based on the analysis and the interpretation of the gravity data of the Tadla basin. Its purpose is to increase the knowledge of this basin structure. A residual anomaly map was first calculated from the Bouguer anomaly data witch are strongly affected by a regional gradient. The computed map provides information on the ground density variation but it does not bring enough of new elements. Data filtering allows us to emphasize the structures affecting the basin. We chose the horizontal gradient coupled to the upward continuation techniques that permit to highlight news structures and to give information on their dip. The elaborated structural map of the study area constitutes a useful document for rationalizing the future groundwater exploration in the Tadla basin. To cite this article: A. Najine et al., C. R. Geoscience 338 (2006).  相似文献   

New thermal triaxial apparatus for unsaturated soils using the osmotic method     

Moulay?Sma?ne?GhembazaEmail author  Said?Ta?bi  Jean?Marie?Fleureau 《Arabian Journal of Geosciences》2015,8(6):3365-3380

The study of the temperature effects on the behaviour of saturated and unsaturated soils on triaxial paths requires the development of a new triaxial experimental device of 3.5 MPa of confining pressure and equipped with a heating collar-controlled temperature. In addition to this case of the unsaturated soils, a special pedestal is developed, so as to impose suctions up to 9 MPa using an osmotic solution of polyethylene glycol (PEG) 6000 through a permeable semi-membrane. Measurements of the degree of saturation and the variation of volume during tests induce various problems, primarily related to the thermal dilation of the osmotic solution and the cell-water system. These problems have been solved by carrying out a preliminary calibration. The applicability of this new apparatus concerns environmental geotechnics and geological engineering such as the design and behaviour of engineered barriers as well as the behaviour of the receiving layers of storage sites like radioactive waste.  相似文献   

Use of Natural Pozzolana and Lime for Stabilization of Cohesive Soils   总被引：1，自引：0，他引：1  

Khelifa?Harichane  Mohamed?Ghrici  Said?KenaiEmail author  Khaled?Grine 《Geotechnical and Geological Engineering》2011,29(5):759-769

The present study investigates the use of natural pozzolana combined with lime for ground improvement applications. Laboratory tests were undertaken to study the effect of natural pozzolana, lime or a combination of both on the physical and the mechanical characteristics of cohesive soils. Natural pozzolana, lime and natural pozzolana-lime were added to two cohesive soils at ranges of 0–20 and 0–8%, respectively. Consistency, compaction, undrained traxial shear and unconfined compressive strength tests were performed on untreated and treated soil samples to assess the physical and mechanical characteristics of the soil. Treated samples were cured for 1, 7, 28 and 90 days. The results show that the cohesive soils can be successfully stabilized by combining natural pozzolana and lime.  相似文献   

GIS-based multi-source database,a strategic tool for sustainable development planning: case of Qalaat Mgouna,Morocco     

Said Ettazarini 《Environmental Earth Sciences》2011,62(7):1437-1445

Sustainable development requires the control and comprehension of natural and anthropic parameters acting on the lifestyle of a target population. It necessitates the envisaging of possible risks related to the change in conditions of the development processes proceeding. Consequently, a database relating to the parameters considered for the planning of durable development programs is necessary. This work, taking the Qalaat Mgouna site as example, shows the utility of the geographic information system (GIS) technology for the gathering and the processing of data concerning natural parameters—geology, morphology, pedology and climate and anthropic parameters—demography, poverty and vulnerability to poverty. The study of the Qalaat Mgouna case shows an urgent need to act for improving the lifestyle of the local population, by adopting sustainable development processes and considering the progressive reduction in the natural resources due to the climatic change and anthropic causes. The result obtained is thus the development of an extensible and multi-source database and thematic maps, available for the planners and serving as a base document for planning development strategies and envisaging the risks associated with execution processes.  相似文献   

Regularity analysis applied to sonic logs data: a case study from KTB borehole site     

Said Gaci  Naima Zaourar  Louis Briqueu  Matthias Holschneider 《Arabian Journal of Geosciences》2011,4(1-2):221-227

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Global representation of the drying–wetting curves of four engineering soils: experiments and correlations     

Zhong-Sen Li  Assia Benchouk  Feth-Ellah Mounir Derfouf  Nabil Abou-Bekr  Said Taibi  Hanène Souli  Jean-Marie Fleureau 《Acta Geotechnica》2018,13(1):51-71

The main objective of this paper is to examine how different engineering soils react to environmental variations and to provide correlations to characterize their behaviour under null external mechanical stress. Two French and two Algerian soils with liquid limits ranging from 36 to 112 were prepared under both slurry and Proctor compaction conditions, and then subjected to drying–wetting paths with suction controlled from several kPa to several hundreds of MPa. Experimental results are presented in five diagrams to show globally and simultaneously the shrinkage–swelling, saturation–desaturation and water retention characteristics. A reasonable consistency was observed between the oedometric and drying curves of slurry, confirming the equivalence between hydraulic loading (suction) and mechanical loading (consolidation stress) on the volume change behaviour of different soils. As an intrinsic parameter of soil nature, liquid limit was found to have a significant influence on the shrinkage limit, air-entry suction and compressibility of both slurry and compacted samples. For that reason, correlations between these characteristics and liquid limit were set up, providing a good basis for a first estimation of the drying–wetting curves. At the micro-scale, new experimental results were obtained: either on drying or wetting path, the micro-pores were almost unaffected, whereas, when matrix suction increased from 0.1 to 8 MPa, the volume of macro-pores decreased to quasi-closure. At last, the analogy between the compaction and drying–wetting curves, and the comparison of different methods to determine the water retention curve were addressed. Such analogies and comparisons contribute to a better understanding of the mechanisms of mechanical stress and suction.  相似文献   

Temporal analysis of air pollution and its relationship with meteorological parameters in Bahrain, 2006–2012     

Majeed S. Jassim  Gulnur Coskuner  Said Munir 《Arabian Journal of Geosciences》2018,11(3):62

The objective of this paper is to analyze temporal and seasonal trends of air pollution in Bahrain between 2006 and 2012 by utilizing datasets from five air quality monitoring stations. The non-parametric and robust Theil-Sen approach is employed to study quantitatively temporal variations of particulate matter (PM₁₀ and PM_2.5), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and ozone (O₃). The calculated annual concentrations for PM₁₀ and PM_2.5 in Bahrain were substantially higher than recommended World Health Organization (WHO) guideline standards. Results showed increasing trends for PM₁₀, PM_2.5, and SO₂ whereas O₃ and its precursor NO₂ showed decreasing behavior. The general increase in air pollution trends is in agreement with prediction of air pollution models for Middle East region due to economic growth, industrialization, and urbanization. The significances of long-term trends were examined. Additional to actual (unadjusted) trends, meteorological adjusted (deseasonalized) trends and seasonal trends were quantified. The box-plot analysis visually illustrated monthly variations of key air pollutants. It showed that only PM₁₀ and PM_2.5 exhibited seasonal pattern, and their concentrations increased during summer and decreased during winter. The effects of ambient air temperature, relative humidity, wind speed, and rainfall on particulate matter (PM) concentrations were further investigated. The Spearman correlation coefficient results demonstrated significant negative correlation between relative humidity and PM concentrations (??0.595 for PM₁₀ and ??0.526 for PM_2.5) while significant positive correlation was observed between temperature and PM concentrations (0.420 for PM₁₀ and 0.482 for PM_2.5).  相似文献   

The Mazafran river (western Sahel of Algiers): superimposition or antecedence?     

Djamal Akziz  Mostefa Guendouz  Mohamed Said Guettouche  Tahar Khelil 《Arabian Journal of Geosciences》2018,11(6):121

At the western Sahel of Algiers, the watercourse of the Mazafran river is perpendicular to the Sahel fold, forming a gorge that has developed in a tectono-eustatic context characteristic of the Sahel region. This gorge has formed in a regime of superimposition which involves the evolution of antecedence in relation to the Sahel uplift. This deduction is the result of multiple analyses that are based on a stratigraphic study which characterizes the succession of continental and marine deposits and the analyses of lineament map of tectonic evolution during the Quaternary which is marked by the Sahel folding. In order to correlate the chronology between the fluvial and marine sedimentary dynamics, a geomorphological study of the Mazafran alluvial terraces associated with the paleoshorelines was realized. The obtained results reveal that the development of the Mazafran river gorge is complex.  相似文献   

Developing a geographic information system (GIS) for mapping and analyzing the polymetallic deposits of M’Sirda volcanic province,Northwest Algeria     

Zohra Ould Taleb-Ouibrahim  Hanafii Benali  Said Medini  Abdelkader Belmouhoub 《Arabian Journal of Geosciences》2014,7(6):2107-2117

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