http://archives.univ-biskra.dz/handle/123456789/40 2026-04-16T22:17:05Z http://archives.univ-biskra.dz/handle/123456789/81 Titre: COMPUTATION OF MASS OSCILLATIONS IN A SURGE TANK BY FINITE ELEMENT TECHNIQUE Auteur(s): AMARA, L; BERREKSI, A; ABDOUNE, K Résumé: The fluctuation of free surface water in surge tanks is of great interest for its design. For this, various mathematical models exist for the analysis of mass oscillations in a surge shaft following valve adjustment. This paper describes a finite element technique using weighted residuals method for the solution of the governing differential equations. Three weighting functions are applied and the results are compared with those from classical methods. First, a relatively simple case of surge analysis with a sudden load rejection in the penstock is analyzed but neglecting tunnel friction. Then friction is included for test and comparison. The results indicate that the proposed numerical approach leads to an accurate simulation of the water surface motion. 2013-12-22T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/80 Titre: RESEARCH OF BACTERIAL INDICATORS OF FAECAL CONTAMINATION IN WATER OF THE HASSAN II DAM (PROVINCE OF MIDELT, MOROCCO) Auteur(s): CHAHBOUNE, M; CHAHLAOUI, A; ZAID, A.; BEN MOUSSA, A; ABOULKACEM, A Résumé: To satisfy its water needs increasingly growing, Morocco has an important infrastructure of dams. However, demographic and economic expansion of Morocco could lead to a deterioration of the water quality of these artificial lakes. The Moulouya watershed is among the most important watersheds in Morocco, it contains to the present five major dams, among them the Hassan II dam, which became operational in 2005. This dam is one of the largest Moroccan reservoirs with a maximum storage capacity of 400 million cubic meters. However, increased human activities upstream of the dam associated with the phenomenon of erosion could lead to pollution of this water mass. The aim of our study was to assess the water quality of the reservoir through the search of bacterial indicators of fecal contamination, via a monthly followed, during the study period from September 2011 until August 2012. Detection of fecal coliforms (CF) and fecal streptococci (SF) in the waters of the dam was a presumption of its contamination by the feces. With the exception of bottom waters that were loaded with spores of sulphite-reducing anaerobes (ASR), the waters of the other stations in the water column did not contain these spores. However, water levels in total coliforms (CT), CF and SF were qualified water quality of the dam as good to excellent, this according to the Moroccan standards of quality of surface waters. 2013-12-22T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/79 Titre: THE TRIPLE FOGGARA OF OULED SAID (Algeria): THE INGENUITY OF THE SAHARAN PEASANTRY Auteur(s): REMINI, B; ACHOUR, B Résumé: Is treated in this paper an original qanat. This is the qanat Ouled Said, consisting of the encounter of three foggaras: Antrite, Amokrane and Badgha, which exploit the groundwater of the Greatest western Erg. All negotiations, sale and purchase of shares of water are conducted in this meeting place of three kasriates called Ouled Brahim. Four missions were conducted in 2007, 2008, 2009 and 2010 in the oasis of Ouled Said for describe and understand the functioning of the qanat of Ouled Said. The measures that were conducted at three kasriates gave a flow of 3.5 l/s divided between the 150 owners of the qanat. It is substantially less than ninety years since it was 26 l/s. Surveys and interviews conducted with owners and the population have revealed that the main causes of degradation of the hydraulic system are socio-economic and environmental. The heritage, migration and siltation are problems that worry the local people. 2013-12-22T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/78 Titre: SORPTION OF 2, 3- DICHLOROPROPIONANILIDE ON FIVE SOILS FROM THE DELTA OF THE SENEGAL RIVER IN MAURITANIA Auteur(s): OULD SID, MOHAMED; OULD KANKOU, AHMED; ABDOULAYE, DEMBA N’DIAYE; OULD HOMEIDA; BAUDU, Michel Résumé: The 2,3-dichloropropionanilide is a position isomer of propanil, a weed-killer widely used nowadays in agriculture across the Sahellian countries. We report here the effect of 2,3-dichloropropionanilide on five soil samples collected in the Mauritanian delta of the Senegal River. Methodology: A bit of how soils were sampled and determined using the reactor must be provided to permit repeatability. The results obtained showed that the physical and chemical compositions of the five soils studied were different. The adsorption in discontinuous reactor revealed a specific effect of 2, 3- dichloropropionanilide with respect to each of the five soils taken individually. The study of the synthetic product adsorption in dynamic reactor confirmed the affinity of the molecule for the organic matter and clay fraction as demonstrated by the effect of the product on a soil from Limoges (France) different from the five Mauritanian soils. The affinity of the 2, 3-dichloropropionanilide is physical for the organic matter and the clay fraction and chemical for the metal compounds such as Aluminium, Iron and Manganese. 2013-12-22T00:00:00Z