LARHYSS Journal


Description

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...


20

Volumes

48

Numéros

594

Articles


Dimensionless Equation of the Radius of Curvature of the Downstream Toe of a Spillway

Houichi Larbi,  Achour Bachir, 

Résumé: The exactness in determining the radius of curvature of the downstream toe of a spillway ensures a smooth hydraulic transit from the upstream to the downstream of the structure. The literature mentions that this radius takes half the height of the dam if the latter is less than 10 m. Beyond this value, the values of the connection radius are numerically tabulated as a function of the height of dam and the head of water over the crest. The purpose of this technical note is to transform the numeric values into multiple dimensional curves and then present them as a single curve with a unique dimensionless mathematical formulation that is easy to apply. The relation thus proposed avoids to the users any kind of interpolation and intermediate dubious calculation.

Mots clés: Spillway ; discharge head ; radius of curvature ; dimensionless relation


NEW THEORETICAL CONSIDERATIONS ON THE GRADUALLY VARIED FLOW IN A WIDE RECTANGULAR CHANNEL

Achour Bachir,  Amara Lyes, 

Résumé: The computation of backwater curves is often encountered in various applications of hydraulic engineering, especially those related to the gradually varying flow in open channels. The knowledge and the mastery of the varied flow condition the correct sizing of the canal. The objective of our study is to contribute to the establishment of an analytical protocol, as simple as possible, with the aim of proposing a generalized relation to the calculation of the gradually varied flow in a wide rectangular channel. The introduction of new dimensionless parameters leads to a differential equation different from those proposed in previous works. The attention will focus mainly on the cases of horizontal and critical channel slopes given their interest on the mathematical side of the problem.

Mots clés: Gradually varied flow ; GVF ; backwater curve ; drawdown curve ; slope ; wide rectangular channel ; control section ; analytical solution


A CLASSIC EXAMPLE OF URBAN-RURAL LINKAGES THROUGH ANCIENT YODA ELA IN SRI LANKA - SYMBIOSIS OF TOTAL ENVIRONMENT ON EFFICIENT WATER MANAGEMENT

Hah Jayasena, 

Résumé: Among the ancient irrigation practices, the Sri Lankan dry zone water management systems sustained for over 2000 years have been well documented. With the influx of communities settling around the historical urban centers, efficient water management was necessary. The invention of the Tank Cascaded system (TCS) and a network of canal systems have emerged to supply water to these centers, which lasted even at present. This paper aims at unraveling some unique functions of the Yoda Ela (YE) canal located in the northern dry zone connecting Kala Wewa (reservoir) with Tissa Wewa. After examining the aerial photographs, Google Earth Pro, and Digital Elevation Models (DEM) followed by field investigations to assess the respective environmental changes, it was evident that the water supply from a transboundary canal took place with the utmost care and in a sustainable manner. Minimal hydrochemical variations and sediment migration coupled with well-maintained irrigation and domestic water supply sustain the community living around this 87 km long canal. The Yoda Ela is one of the excellent representations exemplifying the urban-rural linkages from the total environment and global water history perspectives.

Mots clés: Total environment ; Dry zone irrigation ; Sustainability ; Yoda Ela ; Urban-rural.


MECHANISM OF SPATIO-TEMPORAL EVOLUTION OF COASTAL SANDY BODIES IN A MOUTH: CASE OF THE COMOE RIVER ESTUARY IN GRAND-BASSAM, BAS COTE D'IVOIRE WEST AFRICA

Kouassi Kouamé,  Thieblesson Lydie,  Yao Kouadio,  Gbangbot Jean, 

Résumé: The mouth of the Comoé River, a transition area between the marine, lagoon and river environments, makes it a dynamic environment. It is this dynamism and the spatio-temporal distribution of sandy bodies in this particular coastal area that was the subject of this work. It appears from this study carried out with the help of library data (physical and numerical) and softwares that the dynamism of the sandy bodies of the mouth has not been uniform in time. Indeed, before the opening of the Vridi canal, the high-water flow at the outlet of the grau prevented the accumulation of coarse particles. But the digging of the port structure will reduce the water flow in the Grand-Bassam estuary, which will cause the accumulation of sandy bodies at the mouth. The successive series of clogging and opening of the mouth will not be without consequence on the dynamism of the sandy bodies in this area. Indeed, before the opening, the granulometry of the deposits is much thinner and essentially made up of silt and thin sands, but after the opening, the tidal current, which becomes more important, will carry the silt and thin sands out to sea and leave a much coarser sandy facies exposed. In general, this study has shown that sand movements are dominated by a sandy increase in erosion in the vicinity of the mouth, while the opposite is observed in more distant environments.

Mots clés: Tidal current, ; Clogging, ; Mouth, ; Foreshore, ; Grau, ; Grand-Bassam.


URBAN RURAL LINKAGE THROUGH WATER INFRASTRUCTURE IN THE IRANIAN PLATEAU CASE OF SEMNÂN

Ayda Alehashemi, 

Résumé: For centuries, complex hydraulic systems had a pivotal role in shaping Iranian cities. As socio-technical systems, water infrastructures outlined a strong connection with the socio-spatial organization of the Iranian cities. This article examines the traditional urban-rural linkage in the city of Semnân and shows how this linkage was shaped in various aspects based on the traditional water infrastructure of the city. The paper focuses particularly on the socio-spatial connection between water infrastructure and urban-rural structure in Semnan before the mid-twentieth century. It successively outlines this traditional interconnection in three scales of territorial, urban and architectural organizations. It then puts into question the current situation of the traditional hydraulic system and its correlation with the modern development of the city. The Results of the research shows that the traditional water infrastructure in Semnan had a leading role in Urban-Rural linkage, and spatial organization of the city on different scales until the mid-twentieth century. It shows the integration between hydraulic systems and rural and urban organizations was not limited to the physical aspects. But the hydraulic system governance and organization was in fact deeply integrated with a hierarchical societal system which formed the socio-spatial organization of the Semnan.

Mots clés: Urban Structure ; hydraulic infrastructure ; Iranian Plateau ; Traditional water systems ; socio-spatial structures ; socio-technical systems


CONTRIBUTION OF A GIS TO MAPPING AND SPATIAL-TEMPORAL CHARACTERIZATION OF RAINFALL VARIABILITY: CASE OF THE NORTHERN PART OF IVORY COAST

Djemin Edoukou J.,  Adja Miessan G.,  Assande Assande A.,  Soro Issa S.,  Jourda Jean P.,  Biemi Jean, 

Résumé: The knowledge of rainfall variability is necessary for development projects planning related to water which is increasingly rare in semi-arid areas. This study aims to map and perform a qualitative and quantitative analysis of the spatial and temporal dynamics of rainfall in the northern part of Ivory Coast on a decadal scale over 1961-2000 period in order to ensure the proper functioning of development projects. A GIS was therefore used. The results showed the disappearance of isohyets with high rainfall towards West in favor of those with low rainfall which appear in East. However, rainfall resumption is reported in the last decade (1991-2000). This rainfall dynamic is consistent with covered surfaces analysis by persistent isohyets and with the preponderance of the low rainfall isohyets class which reached 72% of covered surface in the driest decade (1981-1990). During this drier decade, a significant rainfall deficit of -224.62mm was recorded against -168.79mm in the last decade 1990-2000 when a relative rainfall recovery is perceived. The implementation of development projects must therefore be adapted to spatial and temporal evolution of rainfall.

Mots clés: SIG ; mapping ; rainfall variability ; isohyets ; Northern part of Ivory Coast


STUDY OF STILLING BASIN WITH A SWIRLING FLOW

Brakeni Abderrezak ,  Guryev Alim Petrovic ,  Chumicheva Marina Mikhailovna ,  Mareeva Olga Victorovna ,  Verhoglyadova Alexandra Sergeevna , 

Received date: 09-05-2021    Publication date: 07-07-2021    pages  95-110.