Basile Kounouhewa

• University of Abomey-Calavi

The Beninese coast, like most coastal regions, is subject to various hydrodynamic factors that are likely to be modified by climate change. On the coast, the coasts are constantly subject to the action of waves, currents and wind. This work, carried out near the port of Cotonou, aims to provide representative statistics on the direction of the fund...

Meteorological data are useful in many fields related to climate change studies and their use often requires them to be continuous. To date, marginal distribution sampling (MDS), which consists of filling a missing value with an average of the data that are found in similar meteorological conditions over a flexible time window, is widely adopted in...

The description of atmospheric turbulence on heterogeneous surfaces and more specifically during stable stratification conditions, remains nowadays a relevant and open issue in micrometeorology. To partially remedy this problem, we investigate in this study, the behaviour of turbulence above a heterogeneous cultivated surface during stable and unst...

Wood is important in several fields including sculpture and instrument making. In the last two fields, Terminalia superba, Cleistopholis patens, and Holarrhena floribunda are three of Benin's most used wood species. In this work, we have, on prismatic samples (500 mm × 20 mm × 20 mm) of the wood of these species, used the acoustic method Beam Ident...

Wood is a multifunctional anisotropic biomaterial. It is used in various fields, including the craft industry and the construction of structural works. In heavy construction or in wetlands, species with high technological characteristics are sought after. Mimusops andongensis is a species empirically identified as having good technological properti...

The characteristics of the vertical wind profile and the wind potential study on the Conakry site for each atmospheric stability class were investigated in this study. Wind speed and air temperature data recorded over the period from January 2001 to December 2019 at 10 m and 50 m above the ground at daily (50 m) and hourly (10 m) scales were used....

Meeting Name:AGU 2021 Fall Meeting Meeting Date:13-17 December 2021Meeting Location:New Orleans, LA and virtual

This study aims at investigating whether the Integral Turbulence Characteristics (ITC) obey the Monin-Obukhov Similarity Theory (MOST) above a forest site in a Sudanian climate, and at identifying the appropriate ITC models for this ecosystem. Data were collected from a 18 m tower equipped with an Eddy Covariance system, above the clear forest clos...

Reducing the post-harvest losses of agricultural products is a current problem which deserves special attention, worldwide. In this work, agro-meteorological parameters collected at different weather stations of Benin Republic were analysed in order to highlight their seasonality, and to identify favourable air-drying periods for agricultural produ...

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 characteristics contained in precipitation time series. This can lead to erroneous conclusions and an unclea...

This research was conducted in the framework of the feasibility study related to FOCUSED-Benin project, the 5 th work package of the YES-PV NIG BEN project financed by the German Government through its Ministry of Research and High Education (BMBF). The FOCUSED Benin project's major objective is to protect the environment through the utilization of...

Acacia auriculiformis is increasingly used as timber in Benin, while little is known about its wood characteristics and the factors affecting such characteristics in the country. The determination of these characteristics is necessary for understanding the functioning of this species and its uses. The aim of this study was to evaluate anatomical an...

Cloud-to-Ground (CG) lightning intensity time series recorded in northern Benin, during days of monsoon season (summer 2006), has been deeply explored using multifractal framework. The results suggest the existence of strong multifractal characteristics in lightning intensity. However, detrending the data reduces the degree of multifractality. The...

Air pollution due to high concentrations of small particles is a severe issue in West Africa. In this regard, the international scientific team of the DACCIWA project (Dynamics-Aerosol-Chemistry-Cloud-Interactions In West Africa) recently published the policy relevant findings of this action and clearly claimed the need for long-term and reliable m...

This work focused on quantification of the effects of climate change on the hydrodynamic functioning of the Ouémé Delta through the following steps. First of all, an analysis of the current state of extreme climate risks was conducted. Then, a future projection of the Ouémé River discharge at Bonou outlet was made in order to quantify the impact of...

Solar energy is clean and renewable energy obtained from solar radiation. However, the quantity of the Incoming Shortwave Radiation (ISR) reaching the ground depends on meteorological conditions (e.g. clouds covers) which make it intermittent, randomness and nonlinear. These complex properties lead to strong fluctuation of the available solar radia...

West African Zone (WAZ) is highly sensitive to climate variability and weather [1,2]. Climate change (CC) has the self-memory characteristic, which is known as long-term memory (LTM). • So, a better understanding of LTM by improved methods is very important for predicting CC, to reduce the vulnerability and prepare populations for CC adaptation [3]...

The characteristics of the wind vertical profile over the coast of Cotonou during wind convective diurnal cycle were explored in this study. Wind data at 10 m above the ground and the radiosonde data in the lower 60 m of the surface boundary layer were used over the period from January 2013 to December 2016. Based on Monin–Obukhov theory, the logar...

This study analyzed the long-term memory (LTM) in precipitation over Bénin synoptic stations from 1951 to 2010 using the detrended fluctuation analysis (DFA) method. Results reveal the existence of positive long-term memory characteristic in rainfall field. DFA exponent values are different regarding the concerned synoptic stations, reflecting the...

Au Bénin, l'extraction du vin de palme s'effectue par abattage du palmier et coupe quotidienne du bourgeon apical pour le maintenir en « saignée ». Cette pratique est létale pour les palmiers qui sont aussi destinés à la production des huiles de palme et de palmiste. La présente étude a porté sur l'extraction de vin de palme par abattage de 25 pied...

PHYSICAL AND MECHANICAL PROPERTIES OF TEAK WOOD FROM TANZANIAN AND LOCAL PROVENANCES IN BENIN Teak (Tectona grandis L. f.) is a tropical timber species which is in great demand. In Benin, the two most commonly planted teak varieties are of Tanzanian and local provenances. To contribute to the cha- racterisation of teak from Benin, we determ...

Natural ecosystems in sub–Saharan Africa are experiencing intense changes that will probably modify land surface feedbacks and consequently the regional climate. In this study, we have analyzed water vapor (QLE) and sensible heat (QH) fluxes over a woodland (Bellefoungou, BE) and a cultivated area (Nalohou, NA) in the Sudanian climate of Northern B...

p>Rainfall intensity-duration-frequency (IDF) curves are of particular importance in water resources management, for example, in urban hydrology, for the design of hydraulic structures and the estimation of the flash flood risk in small catchments. IDF curves describe rainfall intensity as a function of duration and return period, and they are sign...

We compared the degradation process in organic bulk heterojunction solar cells, upon exposure to a temperate (Belgium) and a sub-equatorial (Benin) climate. Differences in degradation of these devices have been attributed to humidity differences between the temperate and Beninese environments. Our analyses revealed, the decrease rate on 240 h of JS...

Cette publication a pour but d’effectuer l’analyse statistique des vitesses du vent et d’évaluer la production de l’énergie éolienne sur un site isolé au Sud du Bénin. L’étude est faite à partir des données de vents mesurées à l’aéroport de Cotonou par le service météorologique de l’ASECNA (Agence Nationale pour la Sécurité de la Navigation Aérienn...

In this work, the excitons distribution function in organic bulk hetero junction solar cells, at a depth z has been determined from solving the charge continuity equation, by exploiting the Laplace transform with appropriate boundary conditions. Next, the influence of the electron-hole pair separation distance on the excitons dissociation probabili...

Le Bénin ne possède pas des sources de production d’énergie électrique propre à lui-même. Ceci explique sa dépendance énergétique des pays voisins. Pourtant il possède sur sa côte, dans le Golfe de Guinée, une propagation d’un vent quasi permanent et régulier. Une solution avantageuse pour ce pays et la sous-région est la récupération et la transfo...

La forte demande en énergie électrique, à laquelle est soumis le monde, mérite une exploration de toutes les sources d’énergies dont leur valorisation permettra de pallier à la crise énergétique. Le Bénin est un état côtier du Golfe de Guinée qui bénéficie de l’accès à l’océan, qui est le siège d’un perpétuel mouvement de vagues, sources inépuisabl...

Today, we observe at the population level, that the improvement in comfort is accompanied by an increase in the electrical energy required. The predicted exhaustion of fossil energy resources maintains some speculation. Their unequal geographical distribution justifies the energy dependence of Benin overlooked from outside. So it is urgent to explo...

In this paper, we use some well-known techniques of Supersymmetric QuantumMechanics (SUSYQM) namely the factorization method and shape invariance, to generate new analytically solvable potentials from some interacting fermionic models in nonrelativistic limits. These systems are described by the ordinary and the harmonically trapped Schrödinger-Pau...

Under the action of marine currents, non-cohesive sediments evolve by bed-load, by saltation or suspension depending on their granulometry. Several authors have considered that the movement of sediment is bidimensional and modelized the effects of swell by a constant velocitynear the seabed. Here we have studied the velocity profile of fluctuating...

La situation énergétique au Bénin est caractérisée par un faible taux d'accès à l'électricité et une dépendance quasi-totale vis-à-vis de l'extérieur en énergie électrique. Sur la côte béninoise dans le Golfe de Guinée, on observe la propagation d'un vent quasi permanent et régulier. Une solution avantageuse pour le Bénin et la Sous-région est la r...

An open ferromagnetic Ashkin-Teller model with spin variables 0, ±1 is studied by standard Monte Carlo simulations on a square lattice in the presence of competing Glauber and Kawasaki dynamics. The Kawasaki dynamics simulates spin-exchange processes that continuously flow energy into the system from an external source. Our calculations reveal the...

Latent and sensible heat surface fluxes are key factors of the western African monsoon dynamics. However, few long-term observations of these land surface fluxes are available; these are needed to increase understanding of the underlying processes and assess their impacts on the energy and water cycles at the surface–atmosphere interface. This stud...

This study compares the ageing processes of standard P3HT:PCBM bulk heterojunction solar cells upon exposure to a temperate (Belgium) and an equatorial (Benin) climate. Differences in degradation of non-encapsulated systems are attributed to humidity differences between the European and African environments. The decrease in the power efficiency is...

Résumé: En Afrique de l'Ouest, les échanges d'énergie entre la surface et l'atmosphère jouent un rôle crucial dans la boucle de rétroaction entre humidité du sol et précipitations. Toutefois, ces échanges sont encore mal documentés dans cette région. L'objectif de cette étude est d'analyser la saisonnalité des flux d'énergie d'une zone cultivée sit...

Latent and sensible heat surface fluxes are key factors of the western African monsoon dynamics. However, few long-term observations of these land surface fluxes are available; these are needed to increase understanding of the underlying processes and assess their impacts on the energy and water cycles at the surface–atmosphere interface. This stud...

Energy exchange between land and atmosphere are important in climatic processes. In this paper, the seasonal dynamics and diurnal variations of surface radiation components of agricultural crops are investigated. One year data are used to emphasize the separate contribution of each radiation balance component. From the energy budget equation and FA...

Introduction A consistent procedure for quality control of fluxes measured by eddy covariance method is essential for measurement networks and long-term measurements sites (Foken et al., 2004). Herein, data obtained from eddy covariance stations installed in the AMMA-CATCH (www.amma-catch.org) framework are presented. Weather characteristics Experi...

Two methods of the evaluation of the amount of the atmospheric humidity condensed naturally are proposed. The comparison of these two methods is done from climatological considerations. The results in a hot and humid climate are very close; but in a hot and dry climate there is gap of 4% between the two methods.Experiments were conducted in three d...