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Journal Cover LARHYSS Journal
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 1112-3680
   Published by Université de Biskra Homepage  [1 journal]
  • ANALYSIS OF THE EVOLUTION OF THE MEDITERRANEAN SEA LEVEL FROM HISTORICAL
           TIDE GAUGE DATA

    • Authors: M. HADDAD
      Abstract: The historical data series of 34 tide gauges located along the Mediterranean coast were analyzed using statistical trend tests.The application of the Man Kendall test and its version which takes into account the presence of the seasonal component, shows that most of tidal stations have significant trends in sea level rise.The annual rates of sea-level changes estimated by using the Sen’s approach are quite similar to those estimated by the Permanent Service for Mean Sea Level (PSMSL), thus demonstrating the adequacy of selected statistical tests and approaches.The estimated rates of change point to the same conclusion: the Mediterranean sea level has risen since the end of the 19th century.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • STATISTICAL CHARACTERIZATION OF GROUNDWATER QUALITY OF THE NORTHERN AREA
           OF THE BASIN OF HODNA, M’SILA. SOUTHEASTERN ALGERIA

    • Authors: M.Z. BELHADJ, A. BOUDOUKHA, A. AMROUNE, A. GAAGAI, D. ZIANI
      Abstract: The intensive exploitation of groundwater resources in the region of Hodna has greatly influenced the hydrochemical functioning of the Mio-Plio-Quaternary aquifer located in the northern part of the basin of Hodna M'Sila, south eastern Algeria. This has resulted in a general decline of the piezometric level of the groundwater level. The objective of this study is to define the main factors governing water chemistry wide plain with 54 groundwater samples. The initial facies on the limits as well as infiltration areas is carbonate. In the southern part of the plain water becomes charged with SO4, Cl and in connection with the dissolution of salt formations and salt lake. The presence of nitrates is related to agricultural activity. The multivariate statistical techniques such as principal component analysis and hierarchical clustering were applied to data on the groundwater quality of the aquifer. Thesestatistical techniqueshave shownthepresenceofthreesalinitygroupsIt gradually changes from upstream to downstream (North-South) of unsalted water to a heavily salted water near the Chott. Water infiltration in group 1 is mixed gradually along the groundwater flow to achieve a higher water charge to group 3 in the zone of discharge.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • WATER LEAKS IN DAMS IN THE WORLD. SOME ALGERIAN EXAMPLES

    • Authors: H. BENFETTA, B. ACHOUR, A. OUADJA
      Abstract: The majority of dams worldwide are confronted with the problem of water leaks through banks and foundations. The study of this phenomenon turns out of a very big importance, because he can put in danger the stability of the dam and reduce his useful capacity. It is the case in particular Algerian dams, especially those who are implanted in dry zone where the water resource becomes increasingly scarce. In this context, we saw useful to throw an in-depth study handling this thorny problem, where from we confirmed well that several dams are concerned by the problem of water leaks, among which fifteen of them are seriously threatened because the flow lost through their banks and their foundations is considerable exceeding a million of m3 a year. Among these dams, we also noticed that six present a flow of loss upper to five millions of m 3 a year each. For that purpose, we are going to present in this study the Algerian Dams the most threatened by this phenomenon.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • POSSIBILITY OF ELIMINATION OF LEAD BY COAGULATION-FLOCULATION WITH
           ALUMINUM SULPHATE

    • Authors: S. GUERGAZI, D. AMIMEUR, S. ACHOUR
      Abstract: The objective of our work is to study the possibility of eliminating lead by coagulation-flocculation at the aluminum sulphate. The tests are carried out according to the protocol of the "Jar-test" in synthetic solution of distilled water. The results showed that the lead removal efficiency is of the order of 15.16%, this rate corresponded to an optimal dose of the coagulant of 40 mg / L. A very good improvement was obtained at pH greater than 6. With the change in the initial lead content (2 to 12 mg / L), the process of coagulation-flocculation has undergone two antagonistic phenomena, removal efficiencies increase with the increase of the initial content of lead until 8mg/L. Then a proportional decrease in yields in excess of this value. To visualize the effectiveness of coagulation - flocculation and adsorption to eliminate lead, we have carried out the coagulation-flocculation coupling and the adsorption by the activated carbon powder as adjuvant, this test showed good elimination of lead as the dose of the adjuvant was increased.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • STUDY OF OXIDATION/DISINFECTION STEPS OF TREATMENT PLANT OF AIN TINN
           (MILA, EASTERN ALGERIA)

    • Authors: S. ACHOUR, F. CHABBI
      Abstract: Disinfection / oxidation is an essential process for the production of drinking water, safe for the health of consumers. The aim of this study is a description and focuses on the oxidation / disinfection steps in the treatment plant at Ain Tinn (Wilaya of Mila, East of Algeria).This treatment plant has benefited from various oxidation techniques (ozone, permanganate ...) in addition to the final chlorination.Tests on the raw water supplied to the station from the Beni Haroun dam revealed that the quality of the water was often average to poor, particularly with regard to anthropogenic pollution.Tests on filtered treated water before final disinfection showed that parameters such as organic matter, ammonia or bromide appeared to be little eliminated by pretreatment and the clarification phase.During the chlorination tests, high chlorine demands were observed indicating a complex mineral and organic composition of the waters tested. However, chlorination of filtered water results in lower chlorine consumption and indicates that the clarification treatments prior to final disinfection should be more optimized in order to minimize the chlorine / organic matter reaction.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • WASTE WATER TREATMENT IN THE WILAYA OF MASCARA

    • Authors: H. BENFETTA, A. SAHNOUN, B. ACHOUR, A. OUADJA
      Abstract: The spectacular evolution which knows the urban and industrial environment puts in numerous countries the problem of the water. However, under the pressure of the considerable needs, we passed of the employment of waters of source and groundwater in a use more and more pushed some waters of surface. At the same time developed the searches for underground waters, methods of recycling, and now we worry more and more about the desalination of the sea water. Seen in his rarity, waste water became a realistic option to satisfy the needs for the agriculture. For that purpose, our work is based on the study of cover of the purge on the rejections of the wilaya of Mascara. The adopted approach consists in a progress of the works led in water-treatment plants, corresponding to the following tasks: presentation of the methods as well as the results obtained in terms of parameters of the hydric pollution from the point of view of physico-chemical indicators, Estimate in a quantitative and qualitative way waste water untreated, treated with stations, realize a comparative study between waste water untreated and treated with the various stations. So, the end of such a work leads us to estimate the state of the purge and the quantities arranged by this sector towards the irrigation.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • WHEN TWO OPPOSING ECOSYSTEM WET AND DRY BIND BY EROSION PHENOMENON'
           CASE OF THE SAHARA DESERT AND THE AMAZON FOREST

    • Authors: B. REMINI
      Abstract: There is a relationship between two opposing ecosystems: one wet and the other dry: the Sahara desert and the Amazonian forest. The amount of phosphorus lost by water erosion is recovered by wind erosion. Based on the satellite images, three dust export zones were identified. The area of Bodélé (Chad); an area of strong wind erosion generated by the great Venturi of Bourkou. The areas of collar formed by the bypass of mega-obstacles: Hoggar-Tassili (Algeria) by the aeolian flows coming from Libya. Under the effect of the Aïr (Niger) massif, two cervical areas form on either side of the mega-obstacle by the subdivision into two branches of the Aeolian currents coming from Libya. The Sahara exports the phosphorus deficit by clouds of dust flying over the Atlantic to reach the Amazonian forest.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • PROTECTION OF INLAND WATERS IN ALGÉRIA : WHAT STRATEGY SHOULD BE ADOPTED
           FOR THE NEXT TEN YEARS'

    • Authors: B. BELHAOUARI, A. BELGUERMI, T. ACHOUR
      Abstract: The protection of inland surface waters in Algeria faces major challenges. Anthropogenic pressures on water bodies and rivers are increasing. Although regulations prohibit harm to inland surface waters, the protection of these vital environments, both for humans and biodiversity, remains ineffective. We present in the text which follows a critique of the means of fight against the pollution and of the methods of evaluation of the state of the rivers and the bodies of water. This work briefly describes the main legal, administrative, technical and financial elements of a strategy to be implemented over the next ten years.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • ANALYSIS OF THE HYDROLOGICAL IMPACTS OF CLIMATE VARIABILITY IN WEST
           AFRICA: CASE STUDY OF THE BANDAMA WATERSHED IN IVORY COAST

    • Authors: A.M. KOUASSI, A.V.S. ASSOKO, K.E. KOUAKOU, K.B. DJE, K.F. KOUAME, J. BIEMI
      Abstract: This study aims to analyze the changes induced by rainfall variability on the hydrological behavior of the Bandama watershed in Ivory Coast. The climatological data (rainfall, temperature) used cover the period 1951-2015. The methodology consisted, on the one hand, in the determination of the hydrological parameters targeted to carry out the study. These include effective rainfall, runoff potential and infiltration potential. On the other hand, the standard normalization index and two tests of trends (Pettitt test and Hubert segmentation method) were applied to the series of hydrological parameters determined. The main results obtained made it possible to identify the manifestations of the hydrological variability observed in the Bandama watershed. The various hydrological parameters analyzed vary over the years and describe a regressive trend marked by a very significant break in 1980-1981. The estimated hydrological deficits fluctuate between 15% (infiltration potential) and nearly 60% (runoff potential), 16% for average rainfall and 31% for effective rainfall. The decline in rainfall has, of course, consequences for the availability of water resources in a watershed that is also vital.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • MAPPING WETLANDS OF THE BIG SFAX (CENTRE-EAST OF TUNISIA): TOOL FOR
           DECISION MAKING

    • Authors: B. CHAABANE, F. KHEBOUR ALLOUCHE, I. BOUZID, A. BOUJELBEN
      Abstract: Mapping of wetlands of the big Sfax was realized using the typology of the Ramsar convention. The identification and delimitation of these environments is based of visual interpretation of Google Earth high resolution satellite image and field observations. The map produced from the wetlands served as a tool for the study of revalorisation and integration of these ecosystems in the rehabilitation and decontamination projects of Sfax city.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • A NEW MANAGEMENT APPROACH OF DAMS SILTATION

    • Authors: B. REMINI
      Abstract: The present article examines in a first phase the current situation of the silting of Algerian dams based on the collection and analysis of data from about a hundred bathymetric surveys carried out by the National Agency of Dams and Transfers. A second phase proposes a methodology for managing the siltation of dams. The results show that, after 160 years of operation, siltation reached 1.7 billion m3 in the 74 dams with a capacity of 8.5 billion m3 of water. Either a loss of capacity of 20%. The siltation rate reached 65 million m3/year. Dams located in the Chéllif Zahrez watershed are the most threatened by siltation. In this study, we established a ranking of dams on the basis of the annual filling rate. Thus, we have identified 20 dams with a total capacity of 2370 million m3 are seriously threatened by mud deposits. Eight new dams of up to 14 years old are vulnerable to siltation. Twelve dams with a total capacity of 830 million m3 are moderately silted and 24 dams are slightly silted. In 2017, the volume of mud deposited in the 74 dams is estimated at 1.9 billion m3.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • STUDY OF DROUGHT SEQUENCES IN THE ILSLY BASIN (EAST MOROCCO)

    • Authors: D. EL HAFID, Z. ZERROUQI, B. AKDIM
      Abstract: In Morocco, drought is the most frequent major risk in history, with negative impacts on the country's environment and economy. The different regions of Morocco have experienced periods of intense droughts in recent decades. They are characterized by a decrease in rain falls and a tendency to increase temperatures. The watershed of Wadi Isly, in the eastern Morocco, is under a semi-arid climate and has been exposed to severe droughts in recent years. The have negative impacts on the agriculture, water resources and immigration from rural areas. The purpose of this study is to characterize the drought in the Isly basin. It is based on the calculation of the standardized precipitation index SPI (Standardized Precipitation Index), which also indicates the severe and lasting nature of the drought in this region of Morocco. This study also aims to discuss the amplifying factors of this phenomenon in this semi-arid environment.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • REVALUATION OF MEAN SEA LEVEL RISE REVEALED BY ALTIMETRY (1993-2015)

    • Authors: M. HADDAD
      Abstract: The time series analysis and especially forecasting at short and medium terms has undergone a significant development during recent years. This study aims to analysis and forecasting of changes in the global mean sea level. In this perspective, the singular spectrum analysis (SSA) method has been applied to sea level anomaly time series, collected from the various space altimetry missions over the period from January 1993 to December 2015.The results show that the records of the global mean sea level have a clear increasing trend with a contribution in the initial series of 98.49%. This trend shows that the global mean sea level has risen with 88.6 mm, in seasonal adjusted data, over the period from 1993 to 2015. The application of linear regression indicates a rate of 3.36 ± 0.4 mm/year between 1993 and 2015.Two seasonal components characterizing changes in the global mean sea level were identified. These two components have periodicities of 12 months and 6 months, respectively. The total contribution of these two harmonics in the initial time series is of 1.1%. The noise signal, obtained after removal of identified trend and seasonality components, fluctuates between -4.81 and 5.59 mm, with a mean value of -0.03 mm. A strong correlation between the extremes values of noise and Multivariate ENSO Index (MEI) is observed, such as during the strong events El Niño 1998 and El Niña 2011.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • NUMERICAL SIMULATION OF WATER FLOW ALONG STEPPED SPILLWAYS WITH NON
           UNIFORM STEP HEIGHTS

    • Authors: C. BENTALHA, M. HABI
      Abstract: Stepped spillway is a good hydraulic structure for energy dissipation because of the large value of the surface roughness. The performance of the stepped spillway is enhanced with the presence of air that can prevent or reduce the cavitation damage. The flow over a stepped spillway can be divided into nappe flow regime, transition flow regime and skimming flow regime. This study aimsto investigate the effects of the non uniform step heights on the air-water flow properties at stepped spillways. The numerical results of air concentration, air_water velocity and turbulence kinetic energy are presented in this research. Within this work flow over stepped chute is simulated by using fluent computational fluid dynamics (CFD). The volume of fluid (VOF) model is used as a tool to simulate air-water interaction on the free surface thereby the turbulence closure is derived in the k −ε turbulence standard model. The found numerical results agree well with experimental results.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • SIZING AN OPEN CHANNEL WITH HORIZONTAL BOTTOM AND CIRCULAR WALLS USING THE
           ROUGH MODEL METHOD

    • Authors: M. LAKEHAL, B. ACHOUR
      Abstract: The dimensioning of the channels and especially the computation of normal depth plays a significant role in the practice of hydraulic engineer. The classical methods usually used are graphical or iterative to determine the linear dimensions of a pipe or a channel. They also consider, unreasonably, Chezy’s coefficient or Manning’s roughness coefficient as a given data of the problem, despite the fact that these coefficients depend on the linear dimensions sought.This problem can be easily solved by the application of a new method called the rough model method or simply the RMM. In this study, this new analytical method is presented and applied for the calculation of the linear dimensions of an open channel with horizontal bottom and circular sides. These linear dimensions are: the normal depth of flow, the width of the base of the channel and the diameter of circular parts of the channel. The method takes into account, in particular, the effect of the absolute roughness which is a readily measurable parameter in practice. In a first step, the method is applied to a referential rough model in order to establish the relationships that govern its hydraulic characteristics. In a second step, these equations are used to easily deduce the required linear dimensions by introducing a non-dimensional correction factor. A practical example is considered to better explain the advocated method and to appreciate its simplicity and efficiency.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
  • MULTI-OBJECTIF SHAPE OPTIMIZATION OF A SPAN OF IRRIGATION PIVOT

    • Authors: A. GUERRAH, S. DERFOUF, B. GUERRIRA, M. HADID, K. MANSOURI, Y. SAADALLAH
      Abstract: The pivots of irrigation or the swiveling banisters of irrigation are metallic mobile devices with an important size intended for automatic irrigation of cultivated wide fields, they are composed by a central tower, mobile tower and a set of spans.In our country, these devices are made by a company having a complete line of production with a good level of integration of local raw materials including its production. However these devices do not really answer in global needs of a local market, indeed, the shape and the size of the produced and proposed model how is only the once receipts with the production unit.This work consists in clearing tools to modify and develop other models of more adapted pivots to reach this goal we proceed at first to checking the optimality of the shape of the current span, then, we propose the possibility of the weight reduction of this span by using the technique of the variation of geometrical form of the element defining the structure while assuring the quality of the product.The obtained results establish effective tools in the development of new pivots of irrigation; this also show the possibility of modification of the current geometrical configuration and gives relative importance of the choice of the geometrical variables and objectifs functions. In conclusion we were able to propose three models how in theory answer our aims.
      PubDate: 2017-09-30
      Issue No: Vol. 0 (2017)
       
 
 
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