http://archives.univ-biskra.dz/handle/123456789/2884 2026-04-06T14:57:01Z http://archives.univ-biskra.dz/handle/123456789/2898 Titre: SCENARIOS DES CHANGEMENTS CLIMATIQUES POUR LES PRECIPITATIONS ET LES TEMPERATURES EN AFRIQUE SUBSAHARIENNE TROPICALE HUMIDE : CAS DU BASSIN VERSANT DE DAVO, COTE D’IVOIRE Auteur(s): KOUAME YAO MORTON, 1SORO GNENEYOUGO EMILE, 2KOUAKOU KOFFI EUGENE, 3KOUADIO ZILE ALEX, 1MELEDJE N’DIAYE EDWIGE HERMANN, 1GOULA BI TIE ALBERT, 1ISSIAKA SAVANE Résumé: Like Sub-Saharan countries, the Ivory Coast is vulnerable to the effects of climate change. This study aims to assess the impacts of climate change on precipitation and temperatures for 2050 and 2080 horizons in the Davo watershed located in southwestern of Ivory Coast. Four Atmospheric/Ocean General Circulation Models (AOGCMs) and two greenhouse gas emission scenarios (GHGES) A2 and B2 were used to create a range of plausible scenarios. All projections show an increase in temperature. Under the A2 scenario the average model prediction of warming is 1.7 ° C and 3.1 ° C across the two periods while, the precipitation will increase by -0.4% to 3%. Under the B2 scenario, the average model prediction of warming is less important than under scenario A2. Under the B2 scenario, precipitation will experience an increase of 2.4 % and 3.7 % across the two time slice. The B2 scenario is wetter and less hot than the A2 scenario. 2013-05-21T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/2897 Titre: EVALUATION DE LA QUALITE PHYSICO-CHIMIQUE DES EAUX DE PUITS DANS LA REGION DE BERRAHAL (ALGERIE) Auteur(s): KAHOUL M.; DERBAL N.; ALIOUA A.; AYAD W. Résumé: The water quality is a permanent concern of the man who has devoted an entire legislation and ratified many international conventions and protocols for its protection and preservation. To get in such context, the objective of our study is to evaluate the physicochemical quality of water wells in the Berrahal area which a significant number of its population is supplied by groundwater. The evaluation of the quality of such water is based on measurements of the temperature (T°), pH, electric conductivity (EC) and the dosages of total hardness (TH), calcium (Ca2+), chloride (Cl-),nitrate (NO3 -) and nitrite (NO2 -) . The results obtained showed that the measurement values of the physicochemical parameters of the analyzed water were all compliant with the exception of nitrates which has proved abnormal in certain wells and could therefore affect consumer health. 2013-05-21T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/2896 Titre: USING THE PRIESTLEY-TAYLOR EXPRESSION FOR ESTIMATING ACTUAL EVAPOTRANSPIRATION AND MONITORING WATER STRESS FROM SATELLITE LANDSAT ETM + DATA Auteur(s): HAMIMED A.; BENSLIMANE M.; KHALDI A.; NEHAL L.; ZAAGANE M. Résumé: The quantification of evapotranspiration from irrigated areas is important for agriculture water management, especially in arid and semiarid regions where water deficiency is becoming a major constraint in economic welfare and sustainable development. Conventional methods that use point measurements to estimate evapotranspiration are representative only of local areas and cannot be extended to large areas because of heterogeneity of landscape. Remote sensing based energy balance models are presently most suited for estimating evapotranspiration monitoring water stress at both field and regional scales. In this study, we aim to develop a methodology based on the triangle concept, allowing access to evapotranspiration through the classical equation of Priestley and Taylor (1972) where the proportional coefficient α in this equation is ranged using a linear interpolation between surface temperature and Normalized Difference Vegetation Index (NDVI) values. Preliminary results, using remotely sensed data sets from Landsat ETM+ over the Habra Plains in west Algeria, are in good agreement with ground measurements. The proposed approach appears to be more reliable and easily applicable for operational estimation of evapotranspiration over large areas. 2013-05-21T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/2895 Titre: CARACTERISATION PHYSICO-CHIMIQUE DES EAUX DU BASSIN HYDROGRAPHIQUE COTIER ALGEROIS Auteur(s): HADDAD H; GHOUALEM H Résumé: Water is vital element for humans. It is necessary to have quality and sufficient quantity thus ensuring a healthy and safe long term. The environmental protection is to safeguard water resources against all types of pollution. In this work, special attention is given to water resources. The objective of our work is to quantify the water resources of some sites Watershed Coastal Algiers which includes nine sub-basins. Hydrochemical study was conducted to better understand the quality of some resources in the basin. The analysis focused on a number of physico-chemical parameters such as water temperature, hydrogen potential, electrical conductivity, total hardness, Cl- , SO4 2-, NO3 - ,HCO3 - Ca2+, Mg2+ K+ and Na+. This study has allowed us to highlight a number of parameters that come into play in determining the quality of the water and found that the content of these elements, however, remains low and does not, for the most part, risk of major pollution of the watershed Coastal Algiers. 2013-05-21T00:00:00Z