English Larhyss journal is an international peer-reviewed journal published by the research laboratory in subterranean and surface hydraulics since 2002. The scope of the Journal covers the fields in which the teams of the research laboratory in subterranean and surface hydraulics are active. Original research papers, short communications and critical reviews from all fields of science and engineering related to water are welcomed. Larhyss journal is devoted to the rapid publication of research in water engineering, acting as a link between the diverse research communities and practitioners in the field of hydraulics. The journal accepts manuscripts in English preferably or in French exceptionally and publishes abstracts in both official languages. Larhyss journal publishes articles on all aspects of hydraulics including hydrology, water and wastewater treatment, surface, and groundwater protection, flow in channels, and pipes, hydraulic modeling… Français LARHYSS journal est une revue scientifique internationale publiée par le laboratoire de recherche en hydraulique souterraine et de surface depuis 2002. La portée du Journal couvre les domaines dans lesquels les équipes du laboratoire de recherche en hydraulique souterraine et de surface sont actives. Des documents de recherche originaux, des communications brèves et d'analyses critiques de tous les domaines de la science et de l'ingénierie liées à l'eau sont les bienvenus. LARHYSS Journal est consacré à la publication rapide de la recherche en ingénierie de l'eau, agissant comme un lien entre les communautés de recherche diverses et praticiens dans le domaine de l'hydraulique. La revue accepte des manuscrits en anglais préférentiellement ou en français exceptionnellement et publie des résumés dans les deux langues officielles. LARHYSS journal publie des articles sur tous les aspects de l'hydraulique, y compris l'hydrologie, le traitement des eaux, la protection des eaux souterraines et de surface, ecoulements dans les canaux et conduites, modelisation hydraulique...








Govindarajan Suresh Kumar,  Mishra Avanish,  Kumar Abhishek, 

Résumé: Darcy’s law is widely used to describe the steady-state laminar incompressible single-phase fluid flow in a fully saturated porous medium at the macroscopic-scale. However, in reality, we will be dealing with transient non-laminar compressible multi-phase fluid flow through a saturated porous medium. In this context, it is important to understand the original framework of Darcy’s law; and subsequently, we need to understand clearly, under what circumstances the classical Darcy’s law was extended in order to consider the (a) the differential form of Darcy’s law; (b) the non-linear relation between pressure gradient and fluid velocity; (b) the transient nature of fluid flow; (c) the fluid flow through heterogeneous and anisotropic reservoirs or aquifers. It has been reemphasized from the present study that the presence of weak inertial effect along with the laminar fluid regime causes the ‘non-linear’ relation between the macroscopic pressure gradient and the macroscopic fluid velocity, while the strong inertial effect paves the way for the onset of transient nature of fluid flow.

Mots clés: Darcy’s law ; porous medium ; differential form ; transient flow ; inertial effect


Lebdiri Fatiha,  Seghir Abdelghani,  Berreksi Ali, 

Résumé: Spillways are one of the most important parts of dams. There are several types of spillways, but they all play the same role. The flow through these structures is quite complicated hydraulically. The main focus of this study is the free surface flow in stepped spillways. Thus, the objective is to determine the influence of the steps number on the hydraulic parameters of the flow through this type of spillway. Taking into account the complexity of the equations of motion governing the flow through these structures, the use of Ansys-Fluent software was chosen in order to carry out the desired numerical models. It is to be noticed that this software is based on the finite volume method. The basic equations of the phenomenon treated are those of an incompressible fluid given by Navier-Stokes, while for modelling the turbulence the k-ε equations were used. The VOF model coupled with Level-Set was also used in order to take into account the biphasic flow characteristics. The influence of the steps number on the energy dissipation, on the water level, and also on the shear stresses acting on the walls was analyzed.

Mots clés: Stepped spillways ; Turbulent flow ; Navier-Stokes ; k-ε model ; Energy dissipation ; VOF ; Level-Set


قوريف اليم بتروفيش,  براكني عبدالرزاق,  بقلارافا افلينا سورنيفنا, 

Résumé: Parmi les constructions hydrauliques les plus importantes dans un barrage, c’est l'évacuateur de crue. En cas de défaillance structurelle dans la construction de l'installation ou de calcul incorrect de sa capacité de charge, une situation d'urgence peut survenir. Pour assurer un fonctionnement fiable et sans problème des évacuateurs, il est très important de bien calculer le débit et la capacité des installations elles-mêmes, ce qui permet de déverser l'eau en aval pendant les périodes d'inondation et les inondations pluviométriques. La présente étude porte sur les conditions hydrauliques et l'utilisation des formules les plus connues pour déterminer les coefficients de débit des évacuateurs en puits avec un entonnoir de réception d’eau à entrée libre dans un premier cas et un entonnoir à paroi d’orientation du flux dans un deuxième cas. A partir des valeurs obtenues, il est possible de déduire les mêmes conclusions que celles des déversoirs à arête vive avec ou sans vide pour de petites charges. Nous pouvons supposer que l'approximation polynomiale des valeurs expérimentales faite par les auteurs sur le coefficient d'écoulement reflète le phénomène physique de l'écoulement à travers la crête du déversoir par le biais de l’entonnoir de réception. Among components of hydraulic dam constructions, the crucial part is the spillway, from which reliable operation depends on the trouble-free operation. In the event of a structural failure in the construction of the facility or an incorrect calculation of its carrying capacity, an emergency situation may arise. To ensure trouble-free reliable operation of the spillways, it is very important to correctly design it and calculate the capacity of the facilities themselves, allowing water to be discharged to the downstream during periods of floods and rainfall events. The present study deals with the analysis of the existing most usable formulas of calculation of weir flow capacity and theoretical development of the weir flow efficiency of a shaft spillway under small heads on the crest. From the values obtained, it is possible to deduce the same conclusions as those of weirs with a sharp edge with or without a vacuum for small heads. We can assume that the polynomial approximation of the experimental values made by the authors for the flow coefficient reflects the physics phenomenon of flow through the crest of the receiving funnel shaft spillway.

Mots clés: coefficient de débit ; écoulement ; évacuateur en puits ; entonnoir de réception. ; Discharge coefficient ; flow ; shaft spillway ; receiving funnel.


Achour Bachir,  Amara Lyes, 

Résumé: The Hazen-Williams equation is still widely used nowadays, despite its applicability limits that many research workers have highlighted. The equation contains a constant coefficient C which depends only on the material of the pipe. However, many studies have asserted that C should depend on both the relative roughness of the pipe and the Reynolds number. This dependence of C on the relative roughness and the Reynolds number was highlighted by Liou, in particular, through a relationship that interests the present study. A readjustment of Liou's relationship led to an implicit dimensionless equation that was translated into a C dimensionless diagram. Furthermore, the derived dimensionless relationship from the transformation of the Hazen-Williams equation, along with the dimensionless diagram, speeds up the slope of the energy grade line calculation. The dimensionless C relationship reaches a maximum for a given value of the relative roughness. A deep analysis of this relationship led to the successful establishment of the explicit dependence of C maximum on the relative roughness.

Mots clés: Hazen-Williams coefficient ; Darcy-Weisbach ; Galileo number ; Dimensionless diagram


Achour Bachir,  Amara Lyes, 

Résumé: The Manning’s n coefficient represents the friction applied to the flow by the inner wall of a channel or a pipe. For a correct design of hydraulic systems, the designer should have an appropriate value of this coefficient. The present study aims to establish the proper Manning’s n relationship including all the parameters that affect the flow in a partially filled circular pipe, such as the relative roughness, the slope of the energy grade line, and the kinematic viscosity. A new dimensionless parameter, acting as a Reynolds number, is introduced reflecting the relative effect of friction forces versus viscous forces. The study highlights the significant role of this parameter in the variation of the Manning’s n coefficient with the relative flow depth.

Mots clés: Manning’s coefficient ; Darcy-Weisbach ; Partially filled pipe ; Dimensionless diagram


Berreksi Ali,  Benmamar Saadia,  Brahami Daura, 

Résumé: Numerous studies have been and are still being carried out on flows in periodic pattern channels. However, if these continue to multiply, it is because the phenomena involved are very complex and there are still a large number of poorly described points. The main objective of this work is to simulate physically the flow in periodic pattern channels. Given the complexity of these flows, scale models remain a privileged tool. We have carried out a series of experiments on several models of low and high slope macro-roughness channels. Our observations and experimental results have enabled us to propose empirical formulae for studying the flows in these channels.

Mots clés: Periodic pattern channel ; Empirical ; Macro-roughness ; Model ; Slope


Benslimane Malika,  Berreksi Ali,  Benmamar Saadia,  Bouach Ahcene, 

Résumé: The main objective of this study is the simulation of the floods in urban zone by applying a calculation code solving the two-dimensional Saint Venant equations. These equations form a set of three coupled equations, not linear and hyperbolic which are solved by an explicit finite volume scheme. The flow in the urban environment is very complex, so the use of a 2D code has several advantages, since it allows describing of crossroads in topography and to know the area of the submerged zone. In our study, we used the Rubar20 code to simulate the inundations of the floods of the N'Dfali Oued which crosses the zone of study located in full city center of Bejaia (Algeria). The obtained results are compared with the different collected data.

Mots clés: Flood ; Simulation ; Rubar20 ; Urban zone


Faye Moussa Diagne,  Biaou Angelbert Chabi,  Soro Donissongou Dimitri,  Leye Babacar,  Koita Mahamadou,  Yacouba Hamma, 

Résumé: In Burkina Faso, groundwater in hard rock aquifers represents a major asset for the rural populations. But this water is subject to anthropic and natural pollutions as is the case with the sub-watershed of Sissili for which few studies are available. Therefore, it is appropriate to follow their state of pollution. This study aims at a physicochemical characterization of the groundwater quality in order to highlight its relationship to the human and natural environments. As a result, 67 groundwater boreholes were analyzed according to WHO recommendations (2008) and techniques for assessing the quality of groundwater described by Rodier (2009). The results show that the chemical quality of water comes from several processes, which leads to a very complex situation. Water is strongly corrosive and is saturated with calcites. The groundwater is bicarbonated calcic and magnesian. The values of the electric conductivity of water show that the groundwaters are slightly mineralized with a maximum of 639 μS / cm. The value of the pH oscillates around 7 which is generally acid. The chemical hydro analysis revealed the contents in arsenic, fluorine, cyanide, lead, iron, potassium, phosphate, and aluminum exceeding WHO recommendations. The attention must be paid to the minor ions, heavy metals, and metalloids.

Mots clés: Analyze factorial ; groundwater ; Physicochemical ; Hydrochemical ; Hydrofacies ; Sissili


Remini Boualem, 

Résumé: This paper evokes for the first time, an ancestral hydraulic development that has been implemented for more than 7 centuries in the M’zab valley. We baptized: "IRS development". To understand the role of existing millennia structure in the Rivers of M’zab area was conducted during the period: 1996-2020, several missions at two to three per year. Investigations and inquiries were carried out with the Ksourian population and the Oumana El Ma (Management Committee). It turns out that the IRS development of M’zab River is the largest development in the entire M’zab Valley. About 18 structures between galleries, spillways, canal, dam and well were completed. In addition, 2 control towers and 8 operating chambers have been built along the M’zab River to monitor floods and watershed operations. This demonstrates the greatness of the project and the genius of the Mozabite.

Mots clés: M’zab River ; IRS Development ; Flood ; Irrigation ; East palm-grove


Remini Boualem, 

Résumé: This paper discusses, for the first time, flood management in the Ghardaïa oasis. A thousand-year-old hydraulic development has been implemented by the Mozabites on the M'zab River for more than 7 centuries. During the period: 1996-2020 we carried out several missions at the rate of two to three per year. Investigations and inquiries were carried out with the Ksourian population and the Oumana El Ma (management committee). The M’zab River was divided into three ways that is the originality of this project. In order of priority, track 1 called Tardja N’Bouchemdjane transports the first floodwaters for the irrigation of the eastern palm grove of Ghardaïa. The second seguia is used to transport part of the flood water to the Bouchen dam. These waters are intended for recharging the water table. The excess flood water flows directly into the third lane of the M’zab River; it’s a safety security. This original layout, we called it "IRS Dvelopment". Part 2 of this study is devoted to the design and operation of the IRS Development at M’zab River.

Mots clés: M’zab River ; IRS Development ; flood ; Irrigation ; Eat Palm Grove