La nouvelle decouverte sur la machine de Turing

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Techniques agro

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The influence of passenger air traffic on the spread of COVID-19 in the world

Countries in the world are suffering from COVID-19 and would like to control it. Thus, some authorities voted for new policies and even stopped passenger air traffic. Those decisions were not uniform, and this study focuses on how passenger air traffic mi

CLIMATE VARIABILITY AND COTTON PRODUCTION IN THE DEPARTMENT OF ALIBORI IN BENIN: AN ANALYSIS TAKING OF STRUCTURAL BREAKS

This study analyzes the impact of climate variability on cotton cultivation in the department of Alibori, the first cotton producing department in Benin. This analysis is based on climatological data (rainfall, rainfall index, maximum temperature and dura

Carbon dioxide emissions from transport and anemia influence on under-five mortality in Benin

This work is the first study about the joint effect (influence) of carbon dioxide emissions (CO2) from transport and anemia influence on under-five mortality in the Republic of Benin. We focused on that interaction effect and provide scientific pieces of

CHOIX ET EFFICACITE DES METHODES DE CONTRACEPTION : UNE REDUCTION DES BESOINS NON SATISFAITS EN PLANIFICATION FAMILIALE

L'objectif de cet article est de mettre en exergue les bases permettant d’avoir une efficacité théorique élevée des méthodes de contraception à partir d’un choix raisonné et discuté avec son partenaire. Il montre dans une étude purement qua

INFLUENCE DES FACTEURS SOCIODEMOGRAPHIQUES SUR LE COMPORTEMENT VOLATILE DE LA CLIENTELE DE LA TPE ARTISANALE DE LA COIFFURE

Depuis des décennies, la gestion des clients est au coeur de tous les débats de toutes les entreprises. Les plaintes liées aux pertes de clients sont aujourd’hui plus fréquentes. Cette situation est-elle toujours la conséquence d’une insatisfacti

Process of customer loyalty in very small craft enterprises: an exploratory study of the steps and skills of the owner-manager

Customer loyalty, already studied by many practitioners and researchers, continues to be topical due to the benefits that loyal customers provide to the business. There are, in the literature, tools developed for companies to retain customers who become

PLANIFICATION STRATÉGIQUE AXÉE SUR LES INVESTISSEMENTS ET PERFORMANCES TECHNIQUE ET FINANCIÈRE DES SOCIÉTÉS NATIONALES D’ÉLECTRICITÉ

L’objectif de cette recherche est de vérifier s’il existe ou non une relation entre la planification stratégique (axée sur les investissements) et les performances technique et financière des sociétés nationales d’électricité des pays de

L’INFLUENCE DE LA QUALITE PERÇUE DU SERVICE SUR L’ATTITUDE DES ASSURES ENVERS LES SERVICES DE L’ASSURANCE AUTOMOBILE

L’importance de la qualité perçue en marketing est de plus en plus déterminante dans la survie de toutes entreprises. Cependant, peu de recherches se sont intéressées à l’influence de chaque dimension de qualité perçue sur l’attitude dans le

Qualité perçue de l’enseignement supérieure et choix de la structure de formation

Le choix des structures de formations est un facteur déterminant dans la réussite du parcours académique et professionnel de tout individu. Ce choix doit être fait en fonction des critères permettant l’atteinte des objectifs fixés. L’objectif de

Response of the Equatorial Atlantic Cold Tongue to Stratospheric Aerosol Geoengineering

By increasing Earth-atmosphere system albedo, Stratospheric Aerosol Geoengineering (SAG) using sulfur dioxide is an artificial potential means, with the goal to mitigate the global warming effects. In this study, we used the simulations from Geoengineerin

Enseignement des mathématiques dans les lycées et collèges du Bénin : conception et mise en œuvre des situations-problèmes didactiques par les enseignants

Utilisation des moustiquaires imprégnées à Longue Durée d’action (MILD) au Bénin contre le paludisme: impacts des pratiques de lavage en milieu communautaire sur leur efficacité

L’efficacité des Moustiquaires imprégnées à Longue Durée d’action (MILD) a été très largement démontrée ces deux dernières décennies comme moyen efficace de lutte anti vectorielle contre le paludisme. Dans le but de connaître les pratique

Étude des déterminants de la désaffection des enseignants des sciences physiques en république du bénin vis-à-vis du développement professionnel

This study explores physical sciences teachers’ perceptions regarding the objectives of teacher professional development (TPD) and investigates determinants that explain their disaffection to participate in TPD programs. Salient results indicated that t

BILINGUISME FONGBE / FRANÇAIS ET TRANSFERT DE COMPETENCES DANS LES CENTRES D’ALPHABETISATION AU BENIN. QUELLES IMPLICATIONS POUR LES ACTEURS ?.

Le bilinguisme français / langue nationale est à l’épreuve dans les centres d’alphabétisation du Bénin. En effet, face aux exigences d’ordre pédagogique et didactique qui visent l’amélioration de la qualité des

Éducation relative à l’environnement en sciences au bénin : étude des pratiques enseignantes déclarées et exécutées

: Au Bénin, depuis la rentrée scolaire 2005-2006, les concepteurs des programmes d’études ont introduit des éléments d’éducation relative à l’environnement (ERE) dans l’enseignement des sciences de la vie et de la terre (SVT) et de la physi

Pratiques de la pédagogie différenciée au secondaire au Benin : pour quelles différenciation pédagogique et compétences de l’enseignant?

La prise en charge de l’hétérogénéité des apprenants fait appel à la pratique de la pédagogie différenciée (PD). Elle est donc définie comme une approche pédagogique conçue pour enseigner et promouvoir l’apprentissage des apprenants qui on

Étude des perceptions des stagiaires de l’ENS de Natitingou lors de l’élaboration des fiches pédagogiques

Utilisation des moustiquaires imprégnées à Longue Durée d’action (MILD) au Bénin contre le paludisme: impacts des pratiques de lavage en milieu communautaire sur leur efficacité

L’efficacité des Moustiquaires imprégnées à Longue Durée d’action (MILD) a été très largement démontrée ces deux dernières décennies comme moyen efficace de lutte anti vectorielle contre le paludisme. Dans le but de connaître les pratique

Enseignement multigrade au Benin: attitudes des enseignants, des directeurs d’écoles, des parents, des apprenants et des responsables d’ONG vis-à-vis de son adoption

This action research investigates local education system stakeholders’ and NGO representatives’ perceptions toward the adoption of multigrade teaching (MGT) in Benin rural areas. The study also describes teachers’ practices in their class after rece

Etude des difficultés rencontrées par les enseignants débutants sortis de l’Ecole Normale Supérieure de Natitingou, Bénin lors de leur insertion professionnelle

L’insertion professionnelle (IP) des enseignants débutants constitue une problématique existentielle impliquant les acteurs du système éducatif d’un pays. Cette étude quantitative a pour objectif de (1) investiguer la mesure dans laquelle la form

Utilisation des cahiers d’activites dans l’enseignement des sciences en République du Benin : quel impact sur l’apprentissage scolaire ?

Dans l’enseignement des sciences selon l’approche par les compétences au Bénin, afin d’aider l’apprenant à acquérir ou développer des compétences disciplinaires, l’enseignant soumet l’apprenant à des situations-problèmes relatives à

Characterization and application of Alkali-Soluble Polysaccharide of Carica papaya seed for removal of indigo carmine and Congo red dyes from single and binary solutions

Adsorption of Congo red (CR) and indigo carmine (IC) dyes by alkali-soluble polysaccharide (ASP) extracted from Carica papaya seeds was studied in single as well as in binary mixtures. The adsorption study was performed by varying operating variables such

Performance of Moringa oleifera seeds protein and Moringa oleifera seeds protein-polyaluminum chloride composite coagulant in removing organic matter and antibiotic resistant bacteria from hospital wastewater

The aims of this study were focused on the preparation of the Moringa oleifera seeds protein-polyaluminum chloride composite coagulant that improves the coagulation process of organic matters and pathogenic bacteria. The performance of M. oleifera seeds p

Pollution mercurielle et risques sanitaires : Etat des lieux bassin-sud du Bénin

Le mercure est un métal dont les caractéristiques physiques, chimiques et toxicologiques font de lui l’un des métaux les plus surveillés présentement au monde. La République du Bénin n’est certes pas industrialisée, cependant, elle présente

3D‑printed clay‑based ceramic water filters for point‑of‑use water treatment applications

Water is necessary for the survival of all living beings, essential for health and should be a fundamental right for every human being. Thus, to provide enough water with good quality to populations, researchers are currently focusing on the development o

Random transverse single-ion anisotropies in the mixed spin-1 and spin-1/2 Blume–Capel quantum model: Mean-field theory calculations

We have used mean-field theory based on the Bogoliubov inequality for the free energy to study the effects of random transverse single-ion anisotropies and magnetic field on the mixed spin-1 and spin-1/2 Blume– Capel quantum model with the coordinatio

Magnetic properties and phase diagrams of the mixed spin-( 1/2 , 3/2 ) Ising–Heisenberg model in the mean field approximation

In this paper, the effects of the longitudinal D z and the transverse D x crystal fields on the mixed spin-( 1/2 , 3/2 ) Ising–Heisenberg model have been studied. The thermodynamic properties of the model are obtained by using a new approach of the mean

The critical behaviors of a ferromagnetic–ferrimagnetic Ising ternary alloy with mixed spin-( 1/2, 3/2, 5/2)

The ferromagnetic–ferrimagnetic ternary alloy described in the form of AB p C 1− p consisting of spins Si A = 1/2, Sj B = 3/2 and Sj C = 5/2 is studied in the framework of the mean field theory (MFT) based on the Bogoliubov inequality for the free ene

Thermodynamic properties and algebraic solution of the N-dimensional harmonic oscillator with minimal length uncertainty relations

The algebraic solution of the deformed N-dimensional harmonic oscillator in the presence of a minimal length is determined. To reach this goal, we identify a hidden symmetry for the N free deformed harmonic oscillators. This allows us to algebraically det

Type IV singular bouncing cosmology from f ( T ) gravity

We investigate bouncing scenario in the modified f(T) gravity, T being the torsion scalar. Attention is attached to the reconstruction of f(T) able to describe type IV singular bouncing evolution, where we adopt as assumption that the bouncing and type IV

Ab-initio calculations of chemical and optoelectronic properties of 7-atom Pt-Y [Y = Li, Na, K]

Using density functional theory, we investigated structural, chemical, electronic, and optical properties of the 7 neutral atom Pt-Y [Y = Li, Na, K] pure and nanoalloys. The generalized gradient approximation and ultrasoft pseudopotential are considered.

Phytochemical composition and in vitro biological activities of Morinda citrifolia fruit juice

Morinda citrifolia is a plant with broad nutraceutical and therapeutic effects and used in the traditional treatment of several ailments. The objective of this work is to investigate the phytochemistry of the fruit juice of M. citrifolia on one hand and

MORPHO-BIOCHEMICAL CHARACTERISTICS OF AUTOPHAGY OF LYMPHOCYTES FROM PERIPHERAL BLOOD OF PATIENTS WITH MODERATE AND SEVERE BRONCHIAL ASTHMA.

The increased interest in the process of autophagy in various physiological and pathological conditions is the focus of this study. Therefore, the aim was to assess the involvement of lymphocyte autophagy in the pathogenesis of bronchial asthma. Forty-fiv

Level of Organochlorine and Pyrethroid Pesticide Residues in Vegetable Farmers’ Blood of Southern Benin

Pesticides are a class of chemical substance that can destroy pests and other unwanted organisms. When sprayed by the farmers on their crops against pests, pesticides can also have an adverse effects on human health. Determination of pesticide residues

Richardia brasiliensis Collected in Southern-Benin: Phytochemical Screening, Antimicrobial Activity and Toxicity

Aims: The aim of this study is to evaluate the antimicrobial activity of the R. brasiliensis aerial part extracts collected in southern-Benin. Methodology: The phytochemical screening was performed by a differential precipitation staining method. Aqueous

Comparison of the standard WHO susceptibility tests and the CDC bottle bioassay for the determination of insecticide susceptibility in malaria vectors and their correlation with biochemical and molecular biology assays in Benin, West Africa

Abstract Background: The detection of insecticide resistance in natural populations of Anopheles vectors is absolutely necessary for malaria control. In the African region, the WHO insecticide susceptibility test is the most common method for assessing

Effects of Synergist Piperonyl Butoxide (PBO) on Deltamethrin Tolerance in Anopheles Gambiae sensu lato Larvae from Mono Department in South-Western Benin, West Africa

The current study was aimed to study the effects of synergist piperonyl butoxide (PBO) on deltamethrin tolerance in Anopheles gambiae sensu lato larvae from mono department in south-western Benin, West Africa. Larvae and pupae were collected from March to

Study the Use of Larvivorous Fish Against Larvae of Anopheles Gambiae (Diptera: Culicidae) Malaria Vector in Laboratory Conditions in Dogbo District in South-western Benin, West Africa

The current study aimed to study the use of larvivorous fish against larvae of Anopheles gambiae malaria vector in laboratory conditions in Dogbo district in south-western Benin, West Africa. Larvae of Anopheles gambiae s.l mosquitoes were collected from

Importance to use nets against pests in fruit-tree protection in Dogbo district in south-western Republic of Benin, West Africa

The current study was aimed to investigate on the use of nets against pests in fruit-tree protection in couffo department in south-western Republic of Benin, West Africa. The locations of Ayomi, Dévé, Honton, Lokogohoué, Madjrè and Totchangni were sur

Current insecticide resistance status in malaria vector populations from Dogbo district in South-western Republic of Benin, West Africa

This study was aimed to investigate the current insecticide resistance status in malaria vector mosquitoes from Dogbo district in South-western Benin, West Africa. Larvae and pupae of Anopheles gambiae s.l. populations were collected from the breeding sit

Minimal tillage and intermittent flooding farming systems show a potential reduction in the proliferation of Anopheles mosquito larvae in rice field in Malanville, Nothern Benin

Background: Irrigation systems have been identified as one of the factors promoting malaria disease around agricultural farms in sub-Saharan Africa. However, if improved water management strategy is adopted during rice cultivation, it may help to reduce m

EXAMINING BENINESE EFL PRE-SERVICE TEACHERS’ MOTIVATION TO LEARN THE ENGLISH LANGUAGE

It has been noted there is a dearth of data on foreign language learning motivation as far as pre-service teachers are concerned. Therefore, this study examines the motivation of Beninese EFL pre-service teachers with rega

Is biological larviciding against malaria a starting point for integrated multi-disease control? Observations from a cluster randomized trial in rural Burkina Faso

A total of 127 villages were distributed in three study arms, each with different larviciding options in public spaces: i) no treatment, ii) full or iii) guided intervention. Geographically close villages were grouped in clusters to avoid contamination be

Measure the dynamics of malaria transmission using entomological approaches at Natitingou, Northern-East of Benin

To evaluate the level of malaria transmission at Natitingou Northern-East of Benin, a cross sectional entomological study was carried out from April 2016 to March 2017 in urban and rural areas of this city. Adult mosquitoes were collected in both areas

Digitalized mass distribution campaign of insecticide-treated nets (ITNs) in the particular context of Covid-19 pandemic in Benin: challenges and lessons learned

Background: In 2020, Benin has implemented a digitalized mass distribution campaign of insecticide-treated nets (ITNs) in the particular context of COVID-19 pandemic. This paper describes the implementation process as well as the challenges and lesson

Antifungal activity of Ocimum gratissimum L., Lantana camara L. & Pteleopsis suberosa Engl. & Dies used in the treatment of vulvovaginal candidiasis in Benin

Background Vulvovaginal candidiasis is a widespread mycotic infection that affects a large proportion of women of childbearing age. Its management in traditional medicine is based on the use of medicinal plants. This study aimed to evaluate the antifunga

Effect of the association of Chromolaena odorata or Combretum micranthum on the antioxidant activity of Cochlospermum tinctorium

Cochlospermum tinctorium is a medicinal plant recognized for the treatment of various diseases. In Benin, C. tinctorium (wild or cultivated form) alone or its combination with Chromolaena odorata or Combretum micranthum, used in the treatment of liver di

Fall armyworm, Spodoptera frugiperda (J.E. Smith) in maize cropping systems in Benin: abundance, damage, predatory ants and potential control

Invasive fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae), is a species native to the Americas which has spread to Africa in 2016. This insect has been reported in Benin as a major pest of maize causing important economic

Limited ant co-occurrence and defensive mutualism in Acacia plants in a West African savanna

Our understanding of the role of fire and effect of ant species composition, beyond their diversity and abundance, on the effectiveness of mutualism defence is limited. Most of our knowledge of ant–plant defence in tropical Africa is biased towards East

The parasitic fly Nemorilla maculosa exploits host-plant volatiles to locate the legume pod borer, Maruca vitrata

Nemorilla maculosa Meigen (Diptera: Tachinidae) est un parasitoïde solitaire de Maruca vitrata Fabricius importé dans le cadre de la lutte biologique classique contre ce redoutable ravageur du niébé. Les réponses olfactives de N. maculosa ont été

Community-based mass production of Maruca vitrata multi-nucleopolyhedrovirus and its comparative efficacy against Maruca vitrata, cowpea insect pest

Le niébé (Vigna unguiculata (L.) Walp est une importante culture avec de faible rendement causé par les insectes ravageurs. La présente étude a évalué la faisabilité de la production locale de Maruca vitrata multi-nucleopolyhedrovirus (potentiel

Multiple insecticide resistance in Anopheles gambiae (Diptera: Culicidae) from tori-bossito, republic of Benin

In order to detect the multiple insecticide resistance in Anopheles gambiae populations in the district of Tori-Bossito, southern Benin from June-September 2019, firstly adult females aged to 2-5 were subjected to susceptible test using impregnated pape

Influence of amplitude- modulated excitation on the dynamic behaviour of polaristion of a matériel

This work concerns the modelling of the dynamics of polarisation of a centrosymmetric material subjected to an amplitude-modulated excitation (AME). The dynamic equation obtained for the polarisation is the Duffing equation with nonlinearities of orders 3

Passive sensor with Josephson junction coupled to an electric resonator and a nanobeam

This paper deals with a technique for modeling the frequency, amplitudes and electro-dynamic modes of a NEMS (Nano Electro-Mechanical System) obtained by coupling two resonators at a Josephson junction. After a mathematical modeling of the electromechanic

Metal-Contaminated Soil Remediation: Phytoremediation, Chemical Leaching and Electrochemical Remediation

Soil contamination has led to serious land tenure problems, reduction in land usability for agricultural production; as a consequence, food insecurity is nowadays a global challenge. Indeed, with rapid population growth across the world, the food deman

Acute Toxicity of Mercury (HgCl2) to African Catfish, Clarias gariepinus

In order to assess the acute toxicity of mercury on Clarias gariepinus, 108 fish of mean weight 51.27 g ± 2.01 and mean length 20. 2 cm ± 0.72 were divided into six groups of six fish each. The different groups were exposed to the different concentrat

Acute Toxicity of Mercury (HgCl2) to African Catfish, Clarias gariepinus

In order to assess the acute toxicity of mercury on Clarias gariepinus, 108 fish of mean weight 51.27 g ± 2.01 and mean length 20. 2 cm ± 0.72 were divided into six groups of six fish each. The different groups were exposed to the different concentrat

HARMONIC NATURAL LIFTS OF METRICS ON TANGENT BUNDLES

Let (M; g) be a Riemannian manifold, gs and gh be respectively the corresponding Sasaki metric and the horizontal lift on the tangent bundle TM. In this paper we study the harmonicity of g-natural metrics with respect to gs and then with respect to gh.

Cross‑Validation Comparison of COVID‑19 Forecast Models

Many papers have proposed forecasting models and some are accurate and others are not. Due to the debatable quality of collected data about COVID-19, this study aims to compare univariate time series models with cross-validation and different forecast

“Untrapped choice procedures” and their computational complexities

In this paper, we define two versions of Untrapped set (weak and strong Untrapped sets) over a finite set of alternatives. These versions, considered as choice procedures, extend the notion of Untrapped set in a more general case (i.e. when alternativ

Seasonal mixed-layer salinity balance in the tropical Atlantic Ocean: Mean state and seasonal cycle

We investigate the causes of the seasonal cycle of the near-surface salinity using a mixed-layer salinity model and a combination of satellite products, atmospheric reanalyses, and in situ observations for the period 2000–2008, in the tropical Atlantic

Causes for the recent increase in sea surface salinity in the north-eastern Gulf of Guinea

In situ sea surface salinity (SSS) observations showed an increase >0.5 over the period 2002–2009 in the Gulf of Guinea, off the Niger Delta. Observed changes in the Niger River runoff were not consistent with this increase in SSS, but the increase was

Modeled mixed-layer salinity balance in the Gulf of Guinea: seasonal and interannual variability

A regional numerical simulation and observations were used to investigate the various processes controlling mixed-layer salinity balance on seasonal and interannual time scales in the Gulf of Guinea. Processes were quantified using a mixed-layer salt budg

Mixed-layer salinity budget in the tropical Indian Ocean: seasonal cycle based only on observations

The mixed-layer salinity (MLS) budget in the tropical Indian Ocean is estimated from a combination of satellite products and in situ observations over the 2004–2012 period, to investigate the mechanisms controlling the seasonal MLS variability. In contr

Importance of the Equatorial Undercurrent on the sea surface salinity in the eastern equatorial Atlantic in boreal spring

The physical processes implied in the sea surface salinity (SSS) increase in the equatorial Atlantic Cold Tongue (ACT) region during boreal spring and the lag observed between boreal spring SSS maximum and sea surface temperature (SST) summer minimum are

Sea Surface Salinity Signature of the Tropical Atlantic Interannual Climatic Modes

The characteristic sea surface salinity (SSS) patterns associated with the tropical Atlantic meridional and equatorial interannual modes are extracted from in situ observations, by a statistical analysis performed on the 1980–2012 period. These SSS sign

Seasonal cycle of the salinity barrier layer revealed in the northeastern Gulf of Guinea

The region located in the far northeast of the Gulf of Guinea (NEGG), eastern tropical Atlantic, remains poorly documented due to a lack of available in situ ocean data. Heavy rainfall and intense river discharges observed in this region induce a strong

Changes in West African Summer Monsoon Precipitation Under Stratospheric Aerosol Geoengineering

Stratospheric aerosol geoengineering (SAG) is suggested as a potential way to reduce the climate impacts of global warming. Using simulations from the Geoengineering Large Ensemble project that employed stratospheric sulfate aerosols injection to keep glo

Seasonal and inter-annual ONSET Sea Surface Temperature variability along the northern coast of the Gulf of Guinea

The aim of this study is to characterize the coastal upwelling variability at seasonal and inter-annual time scales in the northern Gulf of Guinea (NGoG) using Sea Surface Temperature (SST) collected with autonomous ‘‘ONSET’’ thermometers. Results

Coastal Upwelling Limitation by Onshore Geostrophic Flow in the Gulf of Guinea Around the Niger River Plume

Wind-driven coastal upwelling can be compensated by onshore geostrophic flow, and river plumes are associated with such flow. We investigate possible limitation of the northeast Gulf of Guinea upwelling by the Niger River plume, using regional ocean model

Causes of the Northern Gulf of Guinea Cold Event in 2012

Particularly cool sea surface temperatures (SSTs) were observed in 2012 along the Northern Gulf of Guinea coast. This strong cooling event was seen from February to June and reached maxima in the coastal upwelling areas: SST anomalies of −1°C were obse

Response of the Equatorial Atlantic Cold Tongue to Stratospheric Aerosol Geoengineering

By increasing Earth-atmosphere system albedo, Stratospheric Aerosol Geoengineering (SAG) using sulfur dioxide is an artificial potential means, with the goal to mitigate the global warming effects. In this study, we used the simulations from Geoengineerin

Seasonal Variability of Freshwater Plumes in the Eastern Gulf of Guinea as Inferred From Satellite Measurements

In the eastern Gulf of Guinea (GG), freshwater originated from rivers discharges into the ocean and high precipitation rate are key contributors to the upper ocean vertical density stratification, and play a key role in modulating local air-sea interactio

What Can We Learn From Observed Temperature and Salinity Isopycnal Anomalies at Eddy Generation Sites? Application in the Tropical Atlantic Ocean

Based on 18 years of satellite altimetry data and temperature/salinity (θ/S) profiles from Argo floats, we analyze the isopycnal θ/S anomalies (θ'/S') within newborn eddies in the tropical Atlantic Ocean (TAO). Our results show that on density-coordina

Evaluation of hydromorphological conditions of Grand Popo Beach using two unique video cameras

Beaches are characterized by complex spatial and temporal patterns of erosion and accretion subjected to significant wave and tide influence. The objective of this study is to estimate the evolution of hydromorphodynamic conditions on the shoreline of G

Improving rainfall-runoff modelling through the control of uncertainties under increasing climate variability in the Oueme River basin (Benin, West Africa)

The objective of this paper is to understand how the natural dynamics of a time-varying catchment, i.e. the rainfall pattern, transforms the random component of rainfall and how this transformation influences the river discharge. To this end, this paper d

Evaluating the performance of streamflow simulated by an eco-hydrological model calibrated and validated with global land surface actual evapotranspiration from remote sensing at a catchment scale in West Africa

Study region: Republic of Benin. Study focus: In the Ou´em´e River Basin (48 292 km2), we investigate if the Soil and Water Assessment Tool (SWAT) model can satisfactorily simulate streamflow when observed data is not available and when SWAT is calibra

Hydrological Modelling of the Mono River Basin at Athiémé

The objective of this study is to model the Mono River basin at Athiémé using stochastic approach for a better knowledge of the hydrological functioning of the basin. Data used in this study consist of observed precipitation and temperature data over th

Interannual Variability and Trends of Extreme Rainfall Indices over Benin

Observed rainfall data (1961–2016) were used to analyze variability, trends and changes of extreme precipitation indices over Benin. Nine indices out of the ones developed by the Expert Team on Climate Change Detection and Indices (ETCCDI) were used. Th

An Automatic Optimization Technique for the Calibration of a Physically Based Hydrological Rainfall-Runoff Model

Models are tools widely used in the prediction of hydrological phenomena. The present study aims to contribute to the implementation of an automatic optimization strategy of parameters for the calibration of a hydrological model based on the least acti

Extreme Temperature Trends in the Beninese Niger River Basin (Benin)

In the context of climate change, the study of the variability of the climatic extremes in several regions of the world is of capital importance. This study has as main objective to analyze the variability of extreme temperature events in the Beninese

Impact of Stratospheric Aerosol Geoengineering on Meteorological Droughts in West Africa

This study assesses changes in meteorological droughts in West Africa under a high greenhouse gas scenario, i.e., a representative concentration pathway 8.5 (RCP8.5), and under a scenario of stratospheric aerosol geoengineering (SAG) deployment. Using sim

Influence of the uncertainties related to the Random Component of Rainfall Inflow in the Ouémé River Basin (Benin, West Africa)

Rainfall is very often considered as the driving force of hydrological models. If the rainfall changes, the model output (i.e. flow) is also expected to change. The objective of this paper is to study the impacts of the uncertainties related to the random

Influence of the Long-Range Dependence in Rainfall in Modelling Oueme River Basin (Benin, West Africa)

Nowadays, there is evidence that hydrological processes exhibit long-range dependence (LRD), i.e. power-type decay of autocorrelation also known as the Hurst phenomenon. This means that the stationarity assumption of hydrological time series, which has

Stochastic Modelling of Daily Rainfall for Decision Making in Water Management in Benin (West Africa)

The pattern and amount of rainfall are among the most important factors that affect directly or indirectly all sectors depending on water availability (such as agriculture, water supply, hydroelectricity production, etc.). Knowledge of dry and wet spell c

Extreme Temperature Trends in the Beninese Niger River Basin (Benin)

In the context of climate change, the study of the variability of the climatic extremes in several regions of the world is of capital importance. This study has as main objective to analyze the variability of extreme temperature events in the Beninese bas

Interannual Variability and Trends of Extreme Rainfall Indices over Benin

Observed rainfall data (1961–2016) were used to analyze variability, trends and changes of extreme precipitation indices over Benin. Nine indices out of the ones developed by the Expert Team on Climate Change Detection and Indices (ETCCDI) were used. Th

Extreme Temperature Trends in the Beninese Niger River Basin (Benin)

In the context of climate change, the study of the variability of the climatic extremes in several regions of the world is of capital importance. This study has as main objective to analyze the variability of extreme temperature events in the Beninese bas

Assessing Nonlinear Dynamics and Trends in Precipitation by Ensemble Empirical Mode Decomposition (EEMD) and Fractal Approach in Benin Republic (West Africa)

Climate dynamics and trends have significant environmental and socioeconomic impacts; however, in the Benin Republic, they are generally studied with diverse statistical methods ignoring the nonstationarity, nonlinearity, and self-similarity characteristi

Degree of Integrated Water Resources Management Implementation in Context of Climate Change in a Watershed: Case of Oueme Basin, Benin (West Africa)

This study is based on the hypothesis that the implementation of Integrated Water Resources Management (IWRM) tools in the Oueme watershed has not led to a systematic improvement in the degree of IWRM implementation in the Oueme Valley in Benin. Methodolo

Precipitation Variability in West Africa in the Context of Global Warming and Adaptation Recommendations

It is commonly accepted that the Earth’s climate is changing and will continue to change in the future. Rising temperatures are one of the direct indicators of global climate change. To investigate how the rising global temperature will affect the spati

Changes in west African summer monsoon precipitation under stratospheric aerosol

Stratospheric aerosol geoengineering (SAG) is suggested as a potential way to reduce the climate impacts of global warming. Using simulations from the Geoengineering Large Ensemble project that employed stratospheric sulfate aerosols injection to keep glo

Detection of hydrological impacts of climate change in Benin by a multifractal approach

This study analyzed the hydrological impacts of climate change over Bénin synoptic stations from 1951 to 2010 using multifractal approach. This method is based on the study of temporal evolution of fractal dimension ( ), multifractality index (α), co-di

Modeling of Spacio-temporal Evolution of Salt Dispersion on Nokoue Lake

The numerical modeling of spatio-temporal evolution of lagoon has an important role in predicting the behaviour of these systems. Knowing the concentration of the pollutant field distribution in time and space contributes significantly to the prediction o

Variabilité des extrêmes pluviométriques récents dans le bassin Béninois du fleuve Niger (1960-2016), Bénin

L’objectif de cette étude est d’analyser la variabilité des évènements pluviométriques extrêmes dans le bassin béninois du fleuve Niger de 1960 à 2016. Ainsi, huit indices pluviométriques basés sur les observations quotidiennes ont été cal

Impacts of Climatic Disturbances on the Agricultural Sector at the Scale of the Department of Hills (Benin, West Africa)

Les populations du département sont particulièrement vulnérables aux effets néfastes des variations hydroclimatiques en raison des ressources limitées dont elles disposent. La présente étude analyse les impacts des perturbations hydroclimatiques s