Moumtaz Razack

Contribution of correlation and spectral analyses to the regional study of a large karst aquifer (Charente, France)

The purpose of the study is to demonstrate that correlation and spectral analyses can contribute to the regional study of a large karst aquifer. An example is presented for the La Rochefoucauld karst aquifer (Charente, France). Different types of spatially distributed time series provide valuable spatio-temporal information for the karst aquifer. The available time series consist of the spring flow rates, the flow rates at different locations in sinking streams, the piezometric levels, the electrical conductivity and temperature of the water, the atmospheric pressure and the precipitation. The analysis of the flow rates at the springs shows that the aquifer empties very slowly and has a large storage capacity. Hydrodynamic links were established between three of the four rivers flowing on the aquifer and the springs. The results also demonstrate the important spatial heterogeneity of the aquifer and indicate that the most rapid flow occurs in the northern part of the aquifer. Hourly piezometric and electrical conductivity time series indicate that the transmissivity of the aquifer varies when some conductive channels become desaturated during the low water period. The delays between the distributed recharge and the piezometric level, between the localized river input and the flow rates at the springs and between the electrical conductivities in rivers and the main spring provide information on the travel times in the aquifer. The observation of earth tides and barometric effects indicate that this apparently unconfined aquifer has a confined behaviour.

Turbidity dynamics in karstic systems. Example of Ribaa and Bittit springs in the Middle Atlas (Morocco)

Abstract The identification of the turbidity mechanisms in two karstic springs (Ribaa and Bittit) located in the Middle Atlas Plateau in Morocco was performed by means of correlation and spectral analyses applied to time series of rainfall, flow rates, and turbidity. Time series analyses of rainfall and discharges revealed high inertia and storage capacities of the karstic systems. However, the occurrence of turbidity in the springs proved independent of discharges. A causal relationship between rainfall and the occurrence of turbidity in the form of waves was established. Accordingly, turbidity was assumed to be related to the hydrodynamic conditions prevailing in the karst. Turbulent quickflows in the karst transmissive conduits, following heavy rainfall, are thought to provoke the resuspension of solid particles deposited in the conduits, as well as their transport towards outlets. An external origin has also been contemplated, concerning infiltration waters may be loaded with suspended matters washed from the watershed.

Hydrodynamic characterization of a Sahelian coastal aquifer using the ocean tide effect (Dridrate Aquifer, Morocco)

Abstract In wells tapping coastal aquifers, piezometric fluctuations can be observed in response to the ocean tide. Simultaneous recordings of the ocean tide and of the piezometric variations may provide a basis for characterizing the hydrodynamics of the aquifer. This approach was attempted to characterize the Dridrate aquifer, located on the Atlantic coast of Morocco. This aquifer accounts for most of the regional drinking water resources. However, its hydrodynamic characteristics are very poorly known. The study compares observed and simulated piezometric fluctuations, under various assumptions (confined, semi-confined aquifer). The model, which best explains the hydrodynamic behaviour of this aquifer is a semi-confined and strongly heterogeneous aquifer model (calculated hydraulic diffusivity values vary over several orders of magnitude). This result is new and rather surprising, since to date this aquifer was considered confined in view of its geological setting. Consequently, new questions are raised regarding the protection and management of the groundwater resources of this aquifer.

Application of Meteosat thermal data to map soil infiltrability in the central part of the Lake Chad basin, Africa.

In the central part of the Lake Chad Basin, Africa, the superficial Quaternary aquifer (500,000 km2) forms the main water resource. Little is known about the aquifer recharge processes. Large piezometric depressions affect the aquifer and are still unexplained. Meteosat thermal composite data were used to infer qualitative information about time-space variations of soil moisture. Over the aquifer, Meteosat data reveal that after heavy rainfall, the piezometric depressions (Kadzell, Chari-Baguirmi) appear cooler than the surrounding areas (Manga and Harr). The interpretation is that above the depressions, rainwater accumulates at the surface and does not infiltrate deep into the ground, leading to the observed cooler ground. Accordingly, the depressions are characterized by low rainwater infiltrability, which presumably results in a small rainfall recharge. As far as we know, this is the first time that an observed surface phenomenon is directly related to the origin of some piezometric depressions.

Analysis of pumping tests, with regard to tectonics, hydrothermal effects and weathering, for fractured Dalha and stratiform basalts, Republic of Djibouti

Abstract The Republic of Djibouti is the location of an exceptional geodynamic situation, the Afar Depression, which is an emerged triple junction of the Red Sea, the Gulf of Aden and the East African rifts, where a fault network is particularly well developed and controls the permeability of volcanic aquifers. Pumping test data are analysed for two major basaltic series, the stratiform series (3.4-1 Ma) and the Dalha series (9-3.4 Ma), which are distinguished mainly by their geodynamic characteristics and geological history although they are both recognized as trap rocks. Drawdown and recovery were studied by Jacobs logarithmic approximation of the Theis equation and by the Theis recovery method. Elsewhere, step drawdown data were interpreted with the Cooper-Jacob graphical solution and Roraboughs method. The results describe aquifers in the stratiform and Dalha basalts which are identified by different hydrodynamic characteristics. Stratiform and Dalha aquifer transmissivities range from 1.5 × 10 −4 to 5.7 × 10 −1 m 2 s −1 and from 2.9 × 10 −6 to 1.6 × 10 −2 m 2 s −1 . Storage coefficients determined from piezometer observations and computer simulations describe the aquifers in the Gulf basalts, a particular type of the stratiform series, as semiconfined, and those in the Dalha basalts as confined or unconfined depending on the area. Thus, the calculated specific capacity demonstrated that the stratiform basalt aquifers have more favourable hydrodynamic characteristics than the Dalha basalt aquifers. Specific capacities vary between 0.372 and 510.01 m 3 h −1 m −1 within the stratiform basalts and between 0.008 and 35.2 m 3 h −1 m −1 in the Dalha basalts. As they were originally composed of the same type of trap rocks, the stratiform and Dalha basalts should have a similar magnitude of permeability, and this was confirmed by some wells. The lower specific capacities exhibited by the Dalha basalts is explained by a longer period of alteration and greater hydrothermal activity, as has been observed in well cuttings and field studies.

Hydrogeochemical assessment of the Upper Cheliff groundwater (North West Algeria)

The quality of the Upper Cheliff groundwater, located in North West Algeria, has in recent years undergone serious deterioration due to uncontrolled discharge of urban wastewaters, intensive use of chemical fertilizers in agriculture as well as to overexploitation. This study aims at analyzing the flow pattern of the Upper Cheliff groundwater, determining its current hydrochemical status and understanding the mineralization processes involved in its chemical quality. Two piezometric and sampling campaigns were carried out in 2008 in high water (April) and low water (October) periods. The major chemical ions (Ca2+, Mg2+, Na+, K+, Cl−, HCO3−, NO3−, SO42−) were analyzed in all samples. The piezometric data were mapped and allowed to analyze the groundwater flow conditions, in particular at the boundaries of the aquifer. The interpretation of hydrochemical data was made using various methods (Piper diagram, Stabler classification, base exchanges index, bi-elements scatter diagrams, saturation indices, mapping and multivariate principal component analysis). The results provide a better understanding of this aquifer hydrogeology and hydrochemistry. Several hydrochemical types (chloride-calcium, chloride-sodium and bicarbonate-calcium) characterize the groundwater. Mineralization processes and the origin of salinity are determined by the lithology of the aquifer (dissolution, base exchanges), and by climatic (evaporation) and anthropogenic factors (agricultural and urban wastes). The groundwater in the Upper Cheliff is currently of poor quality. This status is worrying, as this groundwater is an important natural resource for the socio-economic development of this region. Urgent measures must be taken to preserve this resource.

Hydrochemistry of a complex volcano-sedimentary aquifer using major ions and environmental isotopes data: Dalha basalts aquifer, southwest of Republic of Djibouti

In the Republic of Djibouti (Horn of Africa), fractured volcanic aquifers are the main water resources. The country undergoes an arid climate. Alluvial aquifers exist in the wadis (intermittent streams) valleys and, in relation with volcanic aquifers, form complex volcano-sedimentary systems. Due to increasing water demands, groundwater resources are overexploited and require a rigorous management. This paper is focused on the Dalha basalts aquifer, located in the Dikhil area (Southwest of Djibouti). This aquifer is of vital importance for this area. Hydrochemical data and isotopic tracers (18O and 2H) were used to identify factors and phenomena governing the groundwater’s mineralization. The Piper diagram shows complex water types. Results from multivariate statistical analyses highlight three water families according to their locations: (1) groundwater characterized by low ionic concentrations located at the wadis zones; (2) groundwater characterized by moderate salinity and (3) highly mineralized waters mainly flowing in the eastern and central part of the study area, in volcanic aquifers. Results from scatter plots, especially Na versus Cl and Br versus Cl, suggest that the origin of more saline waters is not from dissolution of halite. The δ18O and δ2H data indicate that the groundwater flowing in the alluvial aquifer is of meteoric origin and fast percolation of rainwater occurs in the volcanic aquifers. These findings provide a preliminary understanding of the overall functioning of this complex volcano-sedimentary system. Additional investigations (pumping tests, numerical modeling) are in progress to achieve a more comprehensive understanding of this system.

Modeling of Transient Two Dimensional Flow in Saturated-Unsaturated Porous Media

This study examines the relationship between climate change and undernourishment and its negative impact on child health. The focus of this study is Palghar District (which was formed on August 1, 2014, in State of Maharashtra, India). This paper examines the efficacy of the role of healthy government initiatives and their awareness among people in overcoming the adverse effects of climate-change. The study is based on interviews with the District Collector, various government officials and anthropologists working in the area, as well as secondary data collected from the Palghar District Collectorate. As the data made available by the government were limited, the study is unable to supply extensive information about such aspects as the beneficiaries of various welfare schemes, project costs and cost analysis. Palghar district has reported 64 per 1000 child deaths and 44 per 1000 infant deaths between April and October, 2016. The researcher tried to find links between various potential variables and child mortality in this administrative region. The researcher hopes that by giving voice to a localised issue and discussing possible solutions for curbing the problem of child mortality due to undernourishment, it may be possible to find a long-term and comprehensive model for a solution for the same problem around the world.In modern conditions of globalization, the quality of static data of foreign economic relations of the country plays an important role in decision-making about the foreign economic sphere of the country. This is without their quality leading to wrong static analysis of the indicators of foreign economic relations and methods of evaluation. As a result, it is impossible for correct decision not to be made by the government. Also, there are questions about what are the important priorities in the development of foreign economic relations of the country. According to the analysis of static indicators of foreign economic relations of Syria before and during the crisis, we noted that there was a deterioration of all indicators of foreign economic relations due to armed conflict. This includes the increase in the external debt 2.75 times in 2014 compared with the period before the crisis, the decline in exports and imports, and the improvement of egovernment. In addition, work without high-quality cannot control foreign trade transactions.Liability of the custodian or custodian body for the damage caused by the persons totally divested from the ability to act due to mental disability is a kind of liability for the damage caused by the actions of the other person. In this case, his/her custodian or custodian body that is liable for his/her supervision shall be liable even for the damage caused by the person with mental disabilities. Obligation for supervision and care of the custodian or custodian body for the person with mental disabilities shall be the reason based on which they should respond in cases when the person with mental disabilities causes a damage to the third person. In order this kind of liability to come into consideration, in advance, there should be met some conditions as follows: 1. The damage is caused, 2. The damage is caused by the person that is incapable to judge and by the person who is under custody, 3. The damage has been caused since the custodian has not exercised adequately the supervision function as required according to the Law, decision of a body or any contract. These conditions should be fulfilled together in order that this kind of liability to come into consideration. Theoretical treatments regarding these kinds of liabilities, not in all cases, have brought the due clearance. In theoretical treatments of various authors that have treated this kind of liability there are presented dilemma which require a different analysis and approach in order that there to be identified some cases that have been left untreated until nowadays. Those authors, in their theoretical treatments, have ascertained that the custodian or custodian body shall be released from the liability for the damage caused by the person with mental disabilities or with mental slowdown development or any other circumstance according to which they could not judge his/her actions, if they can prove their innocence whether they have exercised adequately the supervision towards the person with mental disabilities or with mental slowdown development but the same authors have not given further explanations that who will be liable in such cases if the person with mental disabilities does not have economic conditions to make the compensation of the damage. This issue is regulated with legal framework of some countries treated in this paper. We have done this comparative analysis between the legal framework of these countries with the purpose of identifying the similarities and differences between them in regulating this liability. Even that there are some differences in legal determinations, we should say that Kosovo, Croatia, Serbia, Albania, France, Italy, Germany and Spain have approximately similar regulation regarding this liability since all these countries cover this kind of liability with their legal framework.This study is an effort to characterize the legal and social aspects of the polish regulations relating to the employment of people with disabilities in sheltered conditions. In Poland, the role of activation of the disabled in the protected labor market performs three types of operations: sheltered workshops, factories professional activity, and social co-operation. Authors discuss the formal requirements to obtain the status, specific rights, and the obligations of employers who are employing the establishment of protected or reinsured activity. The research included in the study was supplemented by an analysis of available statistical data based on the number of operators protected labor market and the number of disabled people employed in these workplaces.Starting from 1st May, 2004 countries of European Fifteen have gradually opened their labour markets for the new EU members, including the Poles. The first to take this step was Great Britain, Ireland and Sweden, the last - Germany and Austria. For the new EU citizens, emerging opportunities were connected with benefits and wide possibilities, but also with limitations and adaptation difficulties. They had to deal with the language barrier as much as the different culture, accepted behaviours, traditions, work culture and model of spending leisure time. Mentality of migrants – whether they were able or not to immerse into the “new” – had impact on finding themselves in another environment. Most of those, who left Poland did not plan to settle, they were leaving “for some time”, temporarily. Mentally, they were still connected with previous place of residence, more interested in environment left behind than new one. Such behaviour was not conducive to adaptation; on the contrary, it made adaptation harder. Migrants through listening to Polish radio, watching Polish television stations, using the Polish Internet portals and reading national press, separated themselves from the new environment. All of these was due to the assumption that engaging in new place has no point since their stay is only temporary. Their attitude to the kind of work and workplace was similar. Majority of migrants from the EU-8 countries was taking up secondary employment, regardless of educational background. Wages comparable with Polish were supposed to compensate depreciation on the labour market. A wide spectrum of adaptation problems of Polish migrants is an issue raised in reports prepared by specialized research institutions, the Polish Ministry of Foreign Affairs and Polish Community organisations.The system of support for women within the framework of the social policy of the Second Polish Republic included: the adequate regulations of work legislation, the rules of social insurance, the activities towards the maternity protection of the insured and, finally, social services directly or indirectly provided to women by the central as well as local governments. These activities were extensive and, in many cases, very modern. What is more, they were directed towards solving the most important social problems of women. However, rather than common, the scope of those activities was very limited and selective. Moreover, the implementation of those activities was not always in accordance with the plans and expectations of their authors. From the point of view of the existing social needs, the most advanced solutions were those which resulted from a privileged position of women in the work legislation and the system of health insurance. The problem of the insignificant influence always had its roots in the socio-professional structure of the country. Only women in employment or covered by the insurance could receive the benefits. For the rest the offer was no longer that beneficial.In a society genetically endowed with great cognitive potential, the paradigmatic failure of the post-communist education system divide young people into three categories: young elitists who join foreign universities and companies, well-prepared young people eager to study in their country and young NEETs. The increasing percentage of the latter ones is confirmed by the national results obtained in the PISA tests and high school dropout rates. No community in this world can be strong when the investment in education lacks. Non-aligned job policies to educational ones will give birth to worrying imbalances, highlighting the phenomenon of migration. Demographic decline and the lack of strategies to stimulate birth rate will increase the impossibility to ensure generational change within the active population and all these will lead to a block of the pension system. Romania, in the next 20 years will follow the model of the European countries, which face labor importation and the migration of non-European capital. Are there any solutions to counterbalance these trends? This is the question which, the whole rethink of theoretical-methodological analysis of some policies meant to give value to the huge Romanian qualitative human force, deprecated within the large globalization, is based on.The essay deals with the difficult relationship between fiscal responsibility and representation: it seems that the traditional rule “no taxation without representation” is less and less true, as the responsibility of the representatives, be they those of the national parliament or of the representative bodies of local institutions, is no longer a real guarantee. The case of the Italian system is significant: local taxes have been interpreted in a very singular way by the constitutional case law, as the representatives’ responsibility connected with local government levies is limited to the determining only of certain aspects of the fiscal phenomenon. One first goal is therefore to analyse the atypical fiscal and financial responsibility of local administrators. But a specific phenomenon of the Italian Regions with a special level of autonomy deserves attention. These special Regions have negotiated with the central government a specific regime: since the constitutional implementation process of 2009, they dispose of undeniably high percentages of their territories’ tax revenue. The profiles of derived finance have been eliminated and it has been decided to return to the self-financing model, understood as the prevailing allocation in a fixed share of tax revenues produced within the territory. The case of the special regional revenues of Trentino-Alto Adige is a peculiar one and it is specifically studied in this essay. This work discusses the question of representation regarding tax revenues in a different way, based on a particular type of relation between the wealthproducing context and the institutions.Today, internet plays an indisputable role as a means of communication, information flow, and as a point of meeting the needs of a growing number of people. The authors noted more and more important role that mass communication plays in social media. This article presents various definitions of the phenomenon and the proposed typology, and threats which entails using either incompetent social media today. This article is intended to facilitate the communication process for researchers, sociologists, media experts, and people interested in the study of the phenomenon of online communication.A change depending on the time of the flood wave moving in a stream using flood routing approach is examined. Flood routing of flood discharge along the river with their account and calculating the changes in the water level of flood protection structure size is determined to safety. The aim of this study, Sutculer flood event will be modeled by Genetic Expression Programing (GEP) method. The GEP method makes use of few hydrologic parameters such as inflow, outflow, and time. Simulation results indicate that the proposed a predictive model is an appropriate for the flood routing. Case study is presented to demonstrate that the GEP model is an alternative in implementation of the Muskingum model.

Lois d'échelle dans la fracturation de roches dures cristallines et dans le réseau hydrographique associé

Abstract Fractal geometry concepts are applied to analyse hard rock fracturing and the associated river network. The study area is located in the Ivory Coast (region of Man). Analyses point out that fracture network is plane filling, with D≈2 at all scales. The river network displays a rupture scale. This difference is interpreted in terms of geological constraints undergone by the river network according to the scale.

Effect of the environment on the hydrochemical characteristics of an alluvial aquifer following an exceptional multiyear drought (Mediterranean Seashore, Hérault, France): Part II—Climatology and agronomy

The hydrochemical evolution of an alluvial groundwater located along the Mediterranean seashore is analyzed with respect to its agricultural and climatic environment, including degree of saturation of the soil; types of cultures, chemical fertilizers and phytosanitary treatments; selective irrigations of the cultivated areas; precipitations. It is shown that the environmental effect on the groundwaters vulnerability depends on two groups of factors:1.Transfers from surface to groundwater of nitrates, chlorides, sulfates, and potassium, which are governed by: (a) the climatic conditions before the agricultural activities begin, (b) the kinds of agricultural activities and their distribution in time with respect to a given climatic context. Phenomena of retention of and/or rapid diffusion are related to the sedimentary heterogeneities of the reservoir and to the differences of temperatures between irrigation waters and precipitations.2.Cationic exchanges related to the presence of clays of Montmorillonite-Kaolinite type.