Plusieurs scenarios d'impacts sont envisageables, notamment les risques d'inondation, d'erosion et de pollution a travers une augmentation des precipitations et du ruissellement. Les donnees utilisees pour realiser ce travail proviennent de sources diverses et variees teledetections, pedologiques, topographiques, meteorologiques, etc. Les simulations ont ete realisees en deux etapes distinctes, d'abord dans les conditions actuelles ou l'annee a ete choisie comme annee de reference, ensuite en et Les resultats obtenus montrent une tendance a la hausse de la production de sediments dans les prochaines annees.
This article describes a sediment compaction model for sedimentary basin simulators.
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In this model, the concepts previously used in the TEMISPACK model are generalized and described on the basis of formalisms inherent in rock mechanics and soil mechanics. Sediment compaction is described on the geologic time scale by an elastoplastic model Fig. The rheology is defined by an equation connecting the porosity or volume of the sediment to the mean effective stress by situating itself within the hypothesis of consolidometric deformation.
This model is quite similar to the ones used in soil mechanics. It differs only by the choice of the equations linking the volumic variation of the porous medium to the variation of the mean effective stress likewise, in this part coefficient alpha introduced in the definition of effective. Le vaste mouvement de recomposition organisationnelle et politique en cours favorise cette approche fonctionnaliste par bassin.
The progressive implementation of territorial water policy in France, raises the stakes for water management in land planning and territorial development. The current vast movements in organisational and political reshuffling, support an operational approach by basin. However, it also contributes to establish the legitimacy of other territorial constructions - whose logic derives more from the strategic opportunism of local authorities than from the geographical and environmental dimensions of water.
The principal uplifts are of equal antiquity, the oldest and most persistent being the Hadhramawt Arch. All the tectonic activity is linked to Gondwanan fragmentation and breakup from the initial closure of the paleo-Tethys and opening of the neo-Tethys in late Carboniferous to Permian times, and the development of the African Karoo system, through separation of India from Afro-Arabia in the Cretaceous to ultimate separation of Arabia from Africa in the Neogene.
Within individual basins, compartmentalisation by sub-parrallel highs into graben-like and half-graben sub-basins or sectors is related to local adjustments to this continuing motion within the overall structural framework. Or les affaissements ont fait bouger bien plus que les maisons. The damage caused by mining, an issue previously addressed privately by the owners, became the responsibility of government services when mining concessions were handed over to the State.
The handover was particularly delicate in the iron-ore basin of Lorraine, where the closeness of the ore to the surface made this area more liable to subsidence than others. Local reactions to the phenomenon were all the more heated as the territory was already in the throes of an economic crisis.
The solutions sought by. Une comparaison est faite avec les travaux de Lanzoni et Magloire et de Massa et al. The SIMSALT program takes sinusoidal functions simulating climatic and eustatic variations and uses them to model sedimentation in an elementary mesh of an evaporitic basin in permanent restricted communication with the ocean, with arrivals of seawater being determined via a topographic threshold Fig. For this, the mesh is assumed to be made up of several superposed elements Fig. Assessing the human health risk for aluminium, zinc and lead in outdoor dusts collected in recreational sites used by children at an industrial area in the western part of the Bassin Minier de Provence, France.
In a preliminary outdoor dust survey was carried out in the area as the first step to an exposure and health risk assessment study. Dust samples were taken at 19 sites distributed across the study area, depending on the location of recreational areas used by children to play outdoors.
Exposure was calculated according to a scenario evaluation approach for dust ingestion and dermal contact routes. Estimation of health risk for exposure to Al, Zn and Pb in outdoor dust was based on the summation of individual risks for the oral and dermal routes. Results show that Al occurs in very high concentrations but mainly innon-bioaccessible forms, especially near the alumina plant. Zinc and Pb occur in low-average levels but mainly in bioaccessible forms. The preliminary results presented in this study indicate that, for Al and Zn, the outdoor dusts of the BMP represent an acceptable risk to children's health.
However, the estimated hazard quotients suggest that there is some health risk associated to environmental Pb. Runoff and consequently water resources constitute the response of watersheds to pluviometric impulses. Analysis of the Soluble Organic Fraction.
An anaalysis of soluble organic motter in the chloroform from Toarcian shales from the eastern part of the Paris Basin reveals the existence of a northern geochemical province and a southern geochemical province whose commun boundary lies in the Fecocourt region. The northern province is characterized by the influence of the continental domain Ardennes range with regard to organic influx, whereas no terrestrial influx is found in the southern province. These findings agree with the sedimentological indications supplied by the literature and add a geochemical dimension to the paleogeography of this basin.
Oil migration toward reservoirs and traps, and especially its. The basin model discussed in this paper describes the physical and chemical phenomena that control the formation of commercial accumulations of hydrocarbons in the moving framework of a subsiding sedimentary basin : heat. Analysis of Insoluble Organic Matter Kerogens. The present study of kerogens isolated from early Toorcion shales sompled on the eastern out-trop of the Paris Basin from Luxembourg to Morvan verifies the overall homogeneity of the organic matter in this formation. This organic matter is of autoch thonous marine origin.
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However, the occurrence of small variations related to different geogrophical locations reinforces the concept of geochemical provinces in this basin as revealed by a previous analysis of the chloroform extracts. Gouvernance communautaire des milieux humides du bassin South Africa. The community of Craigieburn in KwaZulu-Natal, South Africa, is located on a 1 ha wetland that plays an important role in the regulation and maintenance of the Sand River.
View moreCommunity Based Governance of The Paris Basin Map 1 is a classic example of a stable platform such as has been known throughout the World for a long time now. Aside from the Bartonian and Priabonian, all Eocene and Oligocene stages have been defined in the form of the following four international stratotypes : Sparnacian, Cuisian, Lutetian and Stampian.
It should also be noted that the substages of the Bartonian Auversian, marinesian and the Ludian, the equivalent of the Priabonian, are also Parisian. Even though gaps have recently been redefined C. Pomerol, , though the correlations between the different formations in the basin and those of the surrounding areas D. Curry, ; et al. Pomerol, ; C. Cavelier, ; C. Cavelier and C. Pomerol, have now been determined, and though the worldwide eustatic sea level curve was partly plotted with the help of stratotype sections B.
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Haq et al. Their main objectives are to: detect and map CO2 in the reservoir rocks; detect and quantify possible leaks between the reservoir and the surface.
The partners developed several thoughts and research concerning the various monitoring methods. This enabled drawing up a critical overview of existing methods and proposing leads for further work. At the end of the project, recommendations were made for the stakeholders of CO2 storage, i. In addition, a proposal was made for the general design and implementation of a monitoring programme of an injection test in the Paris Basin, within a depleted reservoir or a deep aquifer.
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Located at — to — m sub sea in the studied sector, these carbonate reservoirs which cumulative thickness is about m, outcrop in the Burgundy region, at about 80 km south-eastern the Sector where they are exploited in several quarries. The analysis of the routine measurements porosity and permeability gathered for this study allowed to improve the knowledge of the petrophysical properties.
Special measurements mercury injection tests allowed to characterize the porous medium. Morozova, O. Pond-coolers at heat and nuclear power stations are natural-technological systems, so the program of their monitoring should include the effect made by the SRPS state regional power station on the pond ecosystem, including thermal discharge of cooling water.
The objectives of this study were development and implementation of a monitoring program for the cooling pond of Berezovskaya SRPS-1 on the chemical and biological water quality indicators and identification of patterns of the thermal and hydrochemical regime when operating the progressive power plant from to The quality of the cooling water of the pond-cooler BGRES-1 was studied under full-scale conditions by selecting and analyzing the water samples of the pond in accordance with the principles of complexity, systematic observation, and consistency of timing their conduct with the characteristic hydrological phases.
Processing of the obtained array of monitoring data by methods of mathematical statistics makes it possible to identify the main factors affecting the water quality of the pond. The data on water quality obtained during their monitoring and mathematical processing over a long time interval are the scientific basis for forecasting the ecological state of the pond, which is necessary to economically ensure the efficient energy production and safety of water use.
Recommendations proposed by these authors, including those partially already implemented, have been to prevent the development of eutrophication processes in the pond-cooler: the construction of a dam that cuts off the main peat massif and cleaning the river banks forming the cooling pond. Full Text Available The deep drilling campaign in the Niger Delta has demonstrated the need for a detailed geopressure and trap integrity drilling margin analysis as an integral and required step in prospect appraisal.
Related Les invertébrés marins du golfe de Gascogne à la Manche orientale (Guide pratique) (French Edition)
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