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 exclusively in English. 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 exclusivement en anglais 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...


21

Volumes

52

Numéros

634

Articles


THE BODÉLÉ DEPRESSION (CHAD): WHEN THE VENTURI EFFECT PROPELLES DUST FROM THE SAHARA TOWARDS THE AMAZON BASIN

Remini Boualem, 
2022-06-15

Résumé: This paper answers the question: How can a region as small as the Bodélé Depression continuously supply large amounts of dust to the Amazon Basin? To answer this question, you must know that millions of tons of dust to fly over more than 4000 km must first be lifted into the upper atmosphere. Such a criterion can only be satisfied by the existence of very violent winds that last several days. This condition was dictated by the geography and geomorphology of the Bodélé region. The adequate layout of the Tibesti and Ennedi mega-obstacles upstream of the Bodélé offers the most beautiful Venturi on the planet. In a very rare case, 3 pass areas participate at the same time to increase the wind speed. These are the passes of Tibesti (south-east), Ennedi (north-west) and Bembéché (under the Venturi effect). The harmattan wind from Libya and Egypt rushes into the Borkou tunnel and escapes from Bembéché (the pass) with much greater speed. The detachment of the air streams from the obstacles takes place in the detachment area (Largeau), which is accompanied by gigantic vortices, thus lifting the dust into the atmosphere. Thus, during the last 20 years, approximately 503 dust uplifts have been recorded at the level of the Bodélé depression, i.e., 58% of the total number of uplifts recorded in the Sahara. The great storms we have called effective upheavals. These are long-lasting dust lifts that exceed 7 days. These storms can send fine particles toward the Amazon. Each year, 2 to 3 effective uprisings per year are recorded in the Bodélé depression.

Mots clés: Amazonia ; Sahara ; Dust rising ; Dust plume ; Bodélé ; Tibesti ; Ennedi


CASE STUDY OF RECREATIONAL FISHING IN RAJOVA (RAJOVIC) RIVER (MONTENEGRO) PRELIMINARY RESEARCH: PART 2

BulatoviĆ Jelisavka,  RajoviĆ Goran, 
2022-08-25

Résumé: Recreational fishing is a popular activity around the globe, and fish welfare issues related to the activity have received increasing attention in some countries, particularly in central and eastern Europe. This work offers an introduction to recreational fishing, reviews the literature on fish welfare in relation to recreational fishing and provides an overview of potential biological impacts and ways to reduce such impacts. We first focus on the question of how to reduce impacts on the welfare of fish during recreational fishing. Second, we describe a case study on the Rajova (Rajović) River (Montenegro), highlighting that practical implications of the fish welfare discourse may be disjointed from the scientific information base and be about fundamental moral questions about the ethical acceptability of the activity per se. We end by providing an outlook on the future of recreational fishing in light of the current fish welfare discourse.

Mots clés: Rajova (Rajovic) River ; recreational fishing ; brown trout ; development


DEVELOPMENT OF AN ARDUINO-BASED LOW-COST TURBIDITY AND ELECTRIC CONDUCTIVITY METER FOR WASTEWATER CHARACTERIZATION

Randika M.a.,  Amarasooriya A.a.g.d.,  Weragoda S.k., 
2022-08-20

Résumé: The turbidity and electrical conductivity of a wastewater stream are undeniably essential parameters in the characterization of wastewater. The primary objective of this study was to design a low-cost, efficient device for monitoring turbidity and electric conductivity of wastewater and to compare its performance against commercially available meters. The results indicated that the developed turbidity model sensor and electric conductivity probe provided a comparable turbidity value (ranging from 20-200 NTU) and EC (ranging from 0-50 mS/cm) compared to commercial meters at almost 10 times lower cost (12.87 US dollars for turbidimeter and 13.52 US dollars for electrical conductivity meter). The error percentage of the developed prototype was less than 5 % for both tested parameters. Therefore, the study concludes that this prototype can be used as an accurate and exact water quality measurement device that is capable of being applied in a wide variety of water quality applications, especially in low-income countries.

Mots clés: Arduino ; electric conductivity ; conductivity meter ; turbidity ; wastewater


ANALYSING THE ANALYTICAL FORMULATION FOR NONLINEAR ROLL MOTION OF A SHIP WITH IRREGULAR WAVES UTILISING HOMOTOPY PERTURBATION METHOD

Palanivelu Balaganesan,  Bachir Achour, 
2022-08-01

Résumé: Damping is unavoidable for the response of a ship’s roll motion in waves. The roll motion of ships is represented as a second-order nonlinear differential equation that includes a nonlinear notation related to damping and restoring moments. In this paper, a new HPM process is implemented to address this real-time problem. Simple and closed-form analytical representations of the ship’s roll motion and other physical properties have been generated. The results of the numerical simulation were compared to those of the analytical results. It is mentioned that there is satisfactory agreement

Mots clés: mathematical modeling ; homotopy perturbation method ; nonlinear damping ; nonlinear roll response ; irregular waves


ENHANCEMENT OF THE STUDY OF WATER LEAKS ON THE LEFT BANK IN THE OUIZERT ALGERIAN DAM

Benfetta Hassan Noureddine,  Remini Boualem,  Achour Bachir,  Ouadja Abid, 
2022-08-28

Résumé: Water leaks are costly but common issues in the Algerian dam. Whatever their reasons, they progressively threaten the stability of the constructs and reduce the capacity of the reservoir. The Ouizert dam, the focus of this study, was built in an arid zone approximately 35 km from southwestern Mascara city, where water supply deficit is a serious challenge. The dam was designed with a maximum capacity of approximately 100 million m3 on Wadi El Hammam. It supplies Oran city, Arzew industrial pole, and El Habra agricultural perimeter and contributes to the Bouhanifia dam. However, it never reached its maximum level due to considerable side-leakages estimated at approximately 1 m3/s. It was thus deemed necessary to perform physisco chemical analyses and piezometric measurements. The data used concerned leakage flow, piezometric coast, distances between the piezometers, physico-chemical parameters (pH, temperature, conductivity), shores of the lake and threshold heights (different water sampling depths of the piezometers) and served to determine the variation between the exfiltration water discharge and the reservoir level. The obtained results can serve as decision-making tools to implement urgently needed dam reclamations

Mots clés: dams ; ouizert ; water leakages ; water release ; arid zones


IMPLEMENTATION OF THE SYSTEMIC APPROACH AND OF SYSTEMS ENGINEERING IN THE SMALL DAMS DESIGN

بن مية قويدر,  رويسات بوشريط,  Bouanani Abderrazak, 
2022-09-09

Résumé: Over the past few years, Algeria has embarked on a vast program to build small dams. The small size of dams, the scattered nature of the irrigation schemes, and the randomness of rainfall are among the parameters that motivated managers to implement this resource mobilization strategy. However, the results obtained were not in good agreement with the expected objectives of this program. Indeed, the assessment performed on approximately twenty small dams located in western Algeria showed many shortcomings that were mainly linked to technical design criteria. In addition, these shortcomings were the result of the lack of overall vision and the lack of interaction between the different branches of study of these structures. The systems approach, which is based on the principles of organization, interdependence, prioritization, coordination and integration, in combination with the requirements engineering, can be of great help in ensuring the reliability and good performance for this type of structure. The present paper attempts to address this issue by proposing the implementation of these two principles, namely, the systemic approach and the requirements engineering, for the design of small dams. An analysis is then carried out to address the conceptual aspects of small dams in three distinct zones: the watershed, the dam site, and the downstream zone. The objectives and missions of the system combined with the requirements of the different operators, the functional review of subsystem design, and the elements and components, including the interactive aspect, made it possible, through a multicriteria performance analysis, to produce the correlation matrices of the weighted requirements. Keywords:

Mots clés: Small dams, System, Systemic analysis, Systems engineering, performance.


DAM RESERVOIR OPERATION OPTIMIZATION USING GENETIC ALGORITHM AND PRINCIPAL COMPONENT ANALYSIS SIMULATION MODEL - CASE OF DAM GHRIB RESERVOIR

Mezenner Noureddine,  Benkaci Tarik,  Bermad Abdelmalek,  Dechemi Noureddine, 
2022-08-20

Résumé: The study of the eighteen-year monthly operating budget of the Ghrib Reservoir from 1999 to 2016 shows an important deficit in satisfying water demand partly due to the uncertainty of stochastic water inflows. In this context, the main objective of the present research work is to overcome this shortcoming by reducing it and improving the current reservoir operation. Therefore, the optimization of this last using a genetic algorithm (GA) is carried out based on historical and simulated water inflows. The performance of the classical GA in optimizing the multipurpose reservoir operation based on the simulated water inflows using the principal component analysis (PCA) model is highly demonstrated given a significant decrease in the water deficit from 47% to 8%. The developed model could help operators make decisions for operating dam reservoirs more efficiently.

Mots clés: Reservoir operation ; genetic algorithm ; optimization ; simulation ; principal components analysis


SAHARA DUST NOURISHES THE SOIL - ROLE OF FLOODS IN THE FERTILIZATION OF PALM GROVES

Remini Boualem, 
2022-08-25

Résumé: This article addresses a very particular meteorological phenomenon. This is the diffusion of desert dust from the Sahara into the atmosphere. Based on satellite images taken by NASA during the period 2001-2021, the Sahara desert sends millions of tons of fine particles out of its territory every year. Thus, during the period from June 4 to July 14, 2020, dust from the Sahara flowed over more than 12,000 km to reach Florida in the United States of America. The Sahara exported a quantity of fine sand from March 25 to 29, 2022 to Europe and more particularly to countries such as France, Portugal, Spain and Switzerland. Despite the problems they cause, such as air pollution, health and the environment, Saharan dust is a very good natural fertilizer. In the Algerian Sahara, for centuries, farmers have exploited the floods drained by the River to feed the soils of the palm groves. With each flood, millions of tons of dust and nutrients are picked up by runoff. This water loaded with fine particles is shared between the farmers by an engineering hydraulic system. The relationship between the Amazonian forest and the Sahara Desert is a good example to justify the contribution of these fine particles to the soil.

Mots clés: Dust ; Flood ; Oasis ; Palm Grove ; Sahara ; Soil fertilization


FLOODS IN EL BAYADH CITY: CAUSES AND FACTORS

حفناوي محمد أمين,  مادي محمد,  بن سعيد مصباح,  بن مالك أحمد, 
2022-09-17

Résumé: Over the last two decades, climatic changes have played a major role in increasing the frequency of floods. El Bayadh city in Algeria has experienced many floods over the last years; the worst flood occurred in October 2011, which affected both population and property. In this paper, some of the local parameters that contribute to flooding in El Bayadh city were analyzed. These include the constriction caused by urban expansion at the edges of Wadi Deffa, which crosses the city, considerably reducing its cross-section and thereby increasing the risk of flooding. The lack of storm drain designs for severe rainstorms contributes to the stagnation of storm water, further increasing the risk. A reduction in the cross-section of the Wadi leads to a change in the flow velocity, which contributes to the overflow. To mitigate the risk, a redevelopment of Wadi Deffa in the zones that are at risk of overflow is necessary. For this purpose, a flood hazard map of the October 2011 flood was realized based on a numerical simulation using HEC-RAS software and the ArcGIS system. This map can be used as a reference to plan the necessary actions to mitigate flooding in El Bayadh city.

Mots clés: Floods ; HEC-RAS ; Wadi Deffa ; El-Bayadh city ; Algeria


SUSTAINABLE DESILTING OF DAMS

Remini Boualem, 
2022-09-28

Résumé: The recovery of mud is the only way to solve the problem of silting up dams. At the beginning of the 1990s, we studied the recovery of mud from a dozen dams in construction and agricultural fields. In the case where the destination of the silt is known thanks to the chemical, physical and mineralogical analyses, the desiltation is carried out in a continuous way; in this case, we speak of sustainable desilting. This is what this paper discusses for the first time. Sustainable desilting consists of equipping the dam with one or more dredges that continuously remove silt. Once the mud is discharged and then stored in basins built upstream of the dam, the water returns to the reservoir. Once dried, the mud is transported to its place of use, but preferably in the agricultural field.

Mots clés: Dam ; Siltation ; Sustainable desilting ; Valorisation of the silt ; Hydraulic dredging


NUMERICAL ASSESSMENT TO HARVEST RAINWATER THROUGH CORE CUTS ON A FLAT ROOF

Shah Syed Muzzamil Hussain ,  Al‑qadami Ebrahim Hamid Hussein ,  Mustaffa Zahiraniza ,  Teo Fang Yenn ,  Qamar Nadia ,  Nathani Azhar ,  Bilal Muhammad ,  Abdur Rehman Malik ,  Tasin Muhammad , 

Received date: 25-04-2022    Publication date: 20-06-2022    pages  57-67.