Développement touristique et développement durable à Hergla (Tunisie)

The natural and patrimonial potentialities at Hergla would allow this typical village in the Tunisian Sahel to develop a new type of tourism in line with the new international requirements in terms of sustainable tourism. Although the integrated station project is suspended, the tourist development that is being carried out to this point seems "soft". It is set up jointly with the development of the residential and leisure sectors under the initiative of private players. Urban control and planning on the part of public authorities now seem weak. Thus, the integrated station project which is back, would be carried out to the detriment of the coastal forest and an already fragile coastal environment. Here, state-led governance to regularize stakeholder issues is contrary to the principles of sustainable development.El potencial natural y patrimonial en Hergla permitiría a este pueblo típico del Sahel tunecino desarrollar un nuevo tipo de turismo de acuerdo con los nuevos requisitos internacionales en términos de turismo sostenible. Aunque el proyecto de complejo integrado se suspende, el desarrollo turístico actual parece ser "suave". Se establece junto con el desarrollo de sectores residenciales y de ocio bajo la iniciativa de actores privados. El control urbano y la planificación por parte de las autoridades públicas actualmente parecen débiles. Por lo tanto, el proyecto de estación integrada que está de regreso se lograría a expensas del bosque costero y un entorno costero ya frágil. Aquí, la gobernanza dirigida por el estado para regularizar las cuestiones de los interesados parece estar en contra de los principios del desarrollo sostenible.Les potentialités naturelles et patrimoniales à Hergla, permettraient à ce village typique du Sahel tunisien de développer un nouveau type de tourisme conformément aux nouvelles exigences internationales en termes de tourisme durable. Bien que le projet de station intégrée soit suspendu, le développement touristique en cours, semble de type « doux ». Il se met en place conjointement au développement des secteurs résidentiel et de loisirs sous l’initiative des acteurs privés. Le contrôle et la planification urbaine de la part des collectivités publiques semblent actuellement faibles. Ainsi, le projet de station intégrée qui est de retour, serait réalisé au détriment de la forêt littorale et d’un environnement côtier déjà fragile. Ici, la gouvernance menée par l’Etat pour régulariser les enjeux d’acteurs semble être à l’encontre des principes du développement durable

Mobilite Du Plomb Et Du Zinc Issus De Retombees Atmospheriques Dans Le Sol : Cas De La Zone Industrielle De Tiaret, Algerie

Study of heavy metals mobility in soil is a necessary step for making an accurate appraisal and quantitative evaluation of the extent of contamination, indeed, wet and dry atmospheric deposits, plays an important role in the cycle of semi-volatile contaminants (Vinogradova, 2000). Metallurgical industries release heavy metals into the atmosphere, these last, clump together to form fines particles suspended in the air, these metals can be transported by wind via aerosol or aqueous pathway and deposited in the soil. The main aim of this work was to study the mobility and fate of lead and zinc from atmospheric deposits in a contaminated soil from the foundry (ALFET) in the industrial zone of Tiaret (Western Algeria) and to determine the effect of physicochemical parameters of the soil on their mobility in the topsoil. The physicochemical analysis of soil samples have shown that zinc and lead levels contents in the surface layer soil (0-30cm) vary depending on the pH, total limestone (CaCO3). The obtained results clearly show the major effect of soil texture, the fine fraction (clay and sand)

Local Ductility and Global Behavior Factor of Steel Frame Structures Braced by Centered Bars System

When an earthquake occurs, civil engineering structures are subjected to forces that lead to a non linear behavior. This is often the case for designed steel structures. So, they absorb a larger part of the seismic energy transmitted to its resistant elements (columns and diagonals). This ability to dissipate energy through plastic deformation is expressed by the q behavior factor, used in the seismic design codes. In this paper a distribution of the local required ductility as a function of the behavior factor is given for steel structures braced by the stability bents of X shape

Seismic Behavior of Reinforced Masonry Structure: Relation between the Behavior Factor and the Ductility

The present work concerns a numerical study of the behavior of reinforced masonry (RM) structures under seismic loading. These structures are made of small hollow elements with reinforcements embedded in the horizontal joints. They were dimensioned according to the rules and codes commonly used. They are subject to vertical loads due to their own weight, and to horizontal loads due to seismic forces introduced by the accelerograms. The software used is the non-linear analysis program Drain2D, based on the finite element method, where the shear panel element was introduced. A series of calculations was performed on a number of structures at different levels, excited by three major accelerograms (El Centro, Cherchell, and Kobe). Throughout the study, our main interest is to evaluate the behaviour factor, the ductility, and the failure mode of these structures while increasing the intensity of earthquakes introduced. The results of this present study indicate that the average values of the behaviour factor and the global ductility are of the order of q≈μ≈3.00. The reinforced masonry structures studied have been broken by interstage displacement. The results given by the study are comparable to those given in the literature and in Eurocode 8. The behavior of reinforced masonry under a seismic load is similar to the behavior of reinforced concrete; it is a ductile behavior that allows the dissipation of the energy transmitted by the earthquake. These numerical studies confirm and complete the experimental work carried out by other researchers. Doi: 10.28991/CEJ-2022-08-10-012 Full Text: PD

BIO-SURVEILLANCE DES METAUX LOURDS (PB, ZN, CU) A LA SORTIE DE LA STATION D’EPURATION DE TIARET (ALGERIE) AU MOYEN DES VEGETAUX AQUATIQUES: PLANTE LEMNA MINOR, ALGUE SPYROGYRA LINK SP ET BROYOPHYTE FONTINALIS ANTIPYRETICA

An original device has been developped and valided to monitor water quality with aquatic plants at the exit of wastewater treatment with plants in ain bouchakifin tiaret (algeria). This device or « bio-station » has provided first particularly interesting results: the selected bio-indicator plants (lemna minor ,spyrogyra link sp and fontinalis antipyretica) are able on one hand to grow in the effluents with a significant accumulation of heavy metals, and on the other hand to detect these micro-pollutants even when they are undectable in effluents. The results obtained during this study, have revealed severe contamination of purified wastewater with heavy metals specially lead, zinc and copper, the values recorded for pb are 29,17 ± 25,66 ug/g (spyrogyra link sp), 48,43 ± 39,07 ug/g (fontinalis antipyretica) et 16,78 ± 12,37 ug/g (lemna minor). The highest values were observed for copper and zinc accumulated by these plants for copper are: 275,93 ± 235,20 μg/g, 416,52 ± 285,88 ug/g and 213,92 ± 137,07 ug/g respectively. By against, the concentrations recorded for zinc are 917,04 ± 654,40 ug/g , 1040,48 ± 848,34 ug/g and 545 ± 368,76 g/g respectively. It therefore appears that a "bio-station" equipped sentinel plants sentinel can be an efficient and economical complementary device for continuously monitoring contamination waste water from treatment plants prior to their arrival at the dams

Analytical solution for statif bending analyses of functionally grades plates with porosities

The paper examines a static bending of porous functional plates (FGP) and rectangular plate solutions, based on an underlying high-order shear deformation theory. The proposed high-order shear deformation theory, as opposed to other theories, includes four unknowns. For this reason, a new shear strain function is considered. The technique of Navier is used in closed-form FGP solutions. Results of deflections and stresses are presented for simply supported border conditions. Current figures are contrasted with the non-poreous plate deflecting solutions and the literature's stresses. Effects of different parameters, including thickness, gradient index and porosity of FGM plates, are discussed

Etude Eco-Dendrométrique Du Dépérissement Du Cèdre De l’Atlas Dans Le Parc National De Theniet El Had “Algérie”

This study aims to search the relationship between the decline of the Atlas cedar and the eco-dendrometrique factors in the National Park of Theniet El Had located in the north-west of Algeria. This study takes place throughout 30 circular plots of 1.000m2 area in which, a dendrometric measures and ecological data are taken in addition to descriptive data for Atlas cedar trees. The descriptive data shows that 34% of inventoried Atlas cedar have damaged leaves and 30% have more then 25% of their crowns damaged. The analysis of variance shows that there is no relationship between the rate of the Atlas cedar decline ant the ecological factors, components of the soil and dendrometric parameters except for the average circumference witch is influenced by the competition between trees. Therefor, a particular management plan for the regulation of competition is a necessity for this park

Treatment of Yarn Dyeing Wastewater Using Different Coagulants Followed by Activated Carbon Adsorption

Yarn dyeing industry consumes large volumes of water and chemicals for wet processing of yarn. The chemical reagents used are very diverse in chemical composition, ranging from inorganic and organic compounds to polymers. The major environmental problem of colorant manufacturing is the removal of dyes from effluents. In this study, the potential of using different coagulants such as alum, ferric chloride, and magnesium chloride were investigated for the treatment of dying wastewater. Alum, magnesium chloride and ferric chloride were tested. Lime, cationic and anionic polymers were used as a coagulant aid. To achieve better performance post treatment using granule activated carbon (GAC) was applied as an adsorbent. The use of 500 mg/l alum aided with 400 mg/l lime and 0.35 mg/l cationic polymer achieved the highest removal rate followed by magnesium chloride then ferric chloride. The removal rates of COD, TSS, and turbidity were 69.5 %, 70.7 %and 96.9 %, Post treatment using GAC enhanced the color and COD removals. Their removal rates reached 94.6% and 77.5%, respectively