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Introduction
Publications
Publications (147)
Le bassin versant du Bandama blanc est situé dans le centre-nord de la Côte d’Ivoire et possède une grande partie
localisée en zone septentrionale ivoirienne. Les ressources hydriques de cette vaste unité morphologique représentent un
apport important pour l’agriculture et l’approvisionnement en eau potable. La grande variabilité climatique et la d...
This work was supported by the National Center for Space Studies in the framework of the future mission surface water and ocean topography (SWOT). The estuarine zones with their complex hydrodynamics represent a great challenge for the future SWOT mission. The Seine estuary was selected by the SWOT Science Definition Team for the calibration/valida...
Depuis de nombreuses décennies, la nappe du Haouz (Marrakech), sollicitée pour répondre aux besoins en eau sans cesse croissants de la population et des activités locales, est sérieusement menacée par la surexploitation et la sécheresse. Le climat (global, local) et les oueds jouent un rôle important dans la variabilité hydrologique de la nappe ain...
82-year rainfall timeseries have been studied together with climatic patterns of NAO using classical statistical methods. Then, the wavelet approach has been applied to show annual (1 year) and inter-annual (2-4y, 5-8y and 8-16y) modes distributed following four major discontinuities: 1945, 1960, 1975 and 1995. The 1y, 2-4y, and 5-8y powers show hi...
The aim of this study is to understand the inter-annual hydrological variability (precipitation and streamflow) in the basins of the High Atlas in Morocco and to determine how climate fluctuations (represented by the North Atlantic Oscillation (NAO) climate index) are expressed in the hydrological system. To reach this objective, time series of pre...
Abstract The long-term variability of rainfall in the Soummam
watershed (NE Algeria) has been analysed over the past
108 years using continuous wavelet method in order to identify
the interannual modes controlling the rainfall variability.
Statistical analyses of rainfall timeseries have shown its distribution following five periods of time, limite...
The aim of this paper is to examine the sediment budget along the coast of Upper-Normandy, including the gravel beach (stock, input and output). The cliff coast and pebble/gravel beach, such along Upper-Normandy coast, is also considered as a system because cliff retreat induces widening of shore platforms and supplies the pebble/gravel beach with...
In Algeria, the particulate flow in rivers is poorly quantified in the wadi due to the absence and the non-standardization of the acquisition of measurement data. Most studies on particulate flows are quantified from time series of hydrometric stations. The present study is based on weekly sampling of water at the mouth of the Soummam watershed for...
In the present context of global changes, considerable efforts have been deployed by the hydrological scientific
community to improve our understanding of the impacts of climate fluctuations on water resources. Both obser-vational and modeling studies have been extensively employed to characterize hydrological changes and trends,
assess the impact...
Abstract
This research is carried out in the framework of the program Surface Water and Ocean Topography (SWOT) which is a partnership between NASA and CNES. Here, a new hybrid model is implemented for filling gaps and forecasting the hourly sea level variability by combining classical harmonic analyses to high statistical methods to reproduce the...
The present study relies on the use and analysis of hydro-meteorological variables, long turbidity time series (from 1988 to 2009, 21 years) and a sedimentary record allowing to better understand the hydro-sedimentary variability of the karst system near to the Radicatel town.
Wavelet analysis of rainfalls, piezometric level and turbidity, as well...
In the Paris Basin in Upper Normandy (France), the chalk plateaus are covered with thick deposits of loess and clay-with-flints, from a few meters to approximately 40 m thick locally. A perched groundwater is sometimes observed in the superficial layers in which evapotranspiration processes seem to occur.
This study’s objective was to understand th...
This study was carried out in the framework of the Surface Water and Ocean Topography (SWOT) programme of the French National Centre of Space Studies (CNES). Based on discharge measurements and Gravity Recovery and Climate Experiment (GRACE) determination of total water storage (TWS), we have investigated the hydrological variability of the main Fr...
AbstractA 5-year monitoring of physicochemical parameters was performed from two campaigns in low and high water periods of the Lower Soummam catchment. Data from 18 wells were processed by multivariate statistical tools in order to identify the principal factors influencing groundwater chemistry. Two matrices of 14 and 8 physicochemical parameters...
Agricultural runoff depends on land use and its spatial distribution within the watershed; with land use being dependent on the socio-economic context. By studying the Pays de Caux (France), we explored the impact of future context changes on this phenomenon through the environmental assessment of prospective scenarios at the watershed level. This...
Pour caractériser les changements climatiques observés aux échelles régionale et locale, une analyse thermique et pluviométrique est proposée. Celle-ci s'appuie sur la méthode graphique chronologique de traitement de l'information (MGCTI) de type Matrice Bertin. Cette investigation permet de rendre compte de l'extrême variabilité des pluies. Elle m...
Le Maghreb central (Algérie, Maroc, Tunisie) est soumis, ces dernières années, à des bouleversements climatiques sans précédent. Pour caractériser ces changements, une étude des pluies est proposée dans le bassin de Bizerte-Ichkeul (région composée de trois types de biotopes différents, lac, djebel, marais, et située dans le nord-est de la Tunisie)...
This work outlines the methodology followed in the study of climate change impact on water resources in North Algeria and presents the results on the vulnerability of the water resources. It focuses on research efforts of old data and homogenization of long series of climate data since 1926 at stations in the watersheds of North Algeria. We were ab...
Sediment exports in rivers constitute the essential of materials transfer from the land surface to the ocean and contribute significantly to the transfer of nutrients, pesticides, heavy metals which can affect water quality. Such problems of water pollution are particularly present at the Norman loess plateaus because soil erosion is a frequent phe...
This research was carried out in the framework of the program Surface Water and Ocean Topography (SWOT)
which is a partnership between NASA and CNES. Sea level is a key variable in marine, climate, and coastal
process studies. In this research, a new methodology was implemented for filling gaps and forecasting the sea level
by combining classical ha...
Climate change: towards a return of rain on the Southern Mediterranean basin. To determine to what extent climate change affects rainfall recorded on the southern Mediterranean basin, the trend analysis is proposed. This study is based on the calculation of the reduced Center index and the chronological graphic method of processing information (MGC...
The future mission of Surface Water and Ocean Topography (SWOT), launched in 2020 over a period of 3-5 years, will be designated to address the issue of sea level variability in coastal zone of the eastern English Channel (NW France). In the present research, a series of statistical analyses were used to investigate the extent to which SWOT measure...
Karst networks can be considered as zones of alteration, storage volumes of eroded material and also as zones of transit. Study of sedimentary fillings in karst allows to determine past hydrodynamic conditions as well as sediment sources. In order to better understand chalk karst genesis differents sedimentary fillings from Northwestern Paris Basin...
Agricultural runoff depends on land use and its spatial distribution within the watershed; with land use being dependent on the socio-economic context. By studying the Pays de Caux (France), we explored the impact of future context changes on this phenomenon through the environmental assessment of prospective scenarios at the watershed level. This...
Pour caractériser les changements climatiques observés aux échelles régionale et locale, une analyse thermique et pluviométrique est proposée. Celle-ci s'appuie sur la méthode graphique chronologique de traitement de l'information (MGCTI) de type Matrice Bertin. Cette investigation permet de rendre compte de l'extrême variabilité des pluies. Elle m...
Dans la région du Maghreb au climat semi-aride méditerranéen, l’agressivité des pluies et leur forte variabilité contribuent à l’érosion des sols qui alimente la charge solide des oueds, facteur d’envasement rapide des barrages hydrauliques. Aspect important caractérisant les écoulements liquides et solides dans le contexte méditerranéen, le thème...
In many cultivated areas of the loess belt in Northern Europe, loamy soils are particularly sensitive to runoff and erosion. The different erosion processes may not be continuous within a catchment, and runoff and erosion responses to rainfall events differ in function of the spatial scale of observation. Many of the underlying mechanisms of this s...
In the context of global climate change, knowing water fluxes and
storage, from the global scale to the local scale, is a crucial issue.
The future satellite SWOT (Surface Water and Ocean Topography) mission,
dedicated to the surface water observation, is proposed to meet this
challenge. SWOT main payload will be a Ka-band Radar Interferometer
(KaR...
Significant climatic change is affecting a large part of our planet. Different models forecast likely increases in precipitation and temperature in many parts of the world. The present research analyzes the general trends of rainfall, temperature and sandstorms over a half a century of observations in Mauritania. This study shows that, after the gr...
Significant climate changes affect a large part of our planet. The various models show an increase in rainfall and temperatures in many parts of the world. This research work analyzes the evolution of temperatures and rainfall recorded on the Algerian coast during more than forty years. The evolution of these two parameters reflects the recent clim...
This study was carried out in the framework of the program Surface Water and Ocean
Topography (SWOT) associated to the National Center of Space Studies (CNES). Basing on discharge
measurements, Gravity Recovery and Climate Experiment (GRACE) Total Water Storage (TWS), we
have investigated the hydrological variability of the main French (Seine, Loir...
The record of the head fluctuations of an alluvial aquifer connected to the estuary of a river submitted to tidal influence can be used to reconstruct the transmissivity field of the aquifer. A Markov chain Monte Carlo (McMC) sampler is used to invert the transmissivity field at a set of pilot points. Our approach is first successfully benchmarked...
The study of current assessment of climate change on coastal zone of West Africa is of a great interest. The proposed analysis aims to show initially the originality of this coastal desert climate. In a second step, the statistical analysis of time series of various parameters (rainfall, temperature, and wind) will identify the main changes that ha...
The inter-annual to multi-decadal winter variability (DJFM) of precipitation on the Seine River watershed (France) was analysed using continuous wavelet transform analysis and compared to the winter North Atlantic Oscillation Index (NAOI). Nine weather stations were used over the 1951 to 2004 period and confirmed the homogeneity of inter-annual flu...
In some previous works we demonstrated the existence of statistically
significant links between interannual up to longer-term fluctuations of
precipitation and flow in the Seine river watershed and the
North-Atlantic Oscillation (NAO). Namely, interannual scales of
variability common to both hydrological and NAO index time series were
detected unsi...
The hydrological variability and dynamics of hydrosystems, either surficial or subterranean, can be strongly controlled by climate fluctuations whatever the spatial scale of observation (e.g., LABAT, 2008 ; MASSEI et al., 2010, MESQUITA, 2009). Such studies are sometimes based on the charactrization of the relationships between hydrological records...
Abstract
This research, supported by the Agence Universitaire de la Francophonie (scientific cooperation projects between universities), focuses on upper Oued Rhumel basin (1130km2), controlled by the Hammam Grouz Dam (region of Constantine). The basin contains karst formations drained by several springs, partly hydrothermal. The aim of this paper...
Climate indices are commonly used as indicators of climate variations and very often compared to those of environmental processes (geophysical, hydrological, ecological, etc.) in order to understand them in terms of regional- to global-scale fluctuations. Through their use in many research fields and published works, it appears that (sometimes not...
Changes of agricultural land use often induce changes in hydrological behavior of watersheds. Hence, effective information regarding runoff responses to future land use scenarios provides useful support for decision-making in land use planning and management. The objective of this study is to develop a methodology to assess land use change scenario...
Quality and amount of waters and sediments conveyed within large drainage basins are crucial for human societies and biodiversity concerns. This work aims to determine the factors controlling the hydrosedimentary response (water discharge and sediment load) of 24 worldwide large drainage basins. In this respect, eleven geomorphologic and climatic v...
The temporal variability of streamflow in the Mississippi river basin, including its major tributaries (Missouri, Upper Mississippi, Ohio and Arkansas rivers), was analysed using continuous wavelet methods in order to detect possible changes over the past 60 years. Long- to short-term fluctuations were investigated. The results were compared with S...
The variability of Seine River flow (France) was investigated using daily time series over the period of 1950–2008. The study aimed at characterizing the dominant modes explaining the variability of flow and at investigating their possible link with the North Atlantic Oscillation (NAO) as the dominant climate regime in the region. The Seine River f...
Post-glacial climate changes and sea-level fluctuations have strongly influenced N-W European environments and sedimentation. To these natural events, increasing anthropogenic pressure has to be added. Forest clearance and agricultural development are the main factors responsible for the erosional processes in Northwest Europe. This article analyse...
During the last millennia, climate changes and sea level raises strongly influenced N-W Europe environments. In the transition of the last glacial period to the present time, to these forcing factors, anthropogenic impacts were added. All of these factors are responsible for erosional crises and subsequently sedimentations. Several studies in the L...
Spatial and temporal variations of water quality were investigated at four sites of an urbanized river in Algeria during a period of low water level in the years 2002, 2003, and 2004. Physical-chemical parameters (temperature, pH, conductivity, dissolved oxygen, suspended matter, chemical oxygen demand [COD], and 5-day biochemical oxygen demand [BO...
Quaternary climato-eustatic oscillations and tectonic movements result in base-level changes that modify the shape of fluvial systems. At the onset of the Holocene, NW European fluvial systems were deeply incised and comprised several terraces. Some terraces now lie beneath the estuary that formed in response to the Holocene sea-level rise. The mac...
The variability of precipitation on the Seine River watershed (France) was studied during winter for 1951-2004. This study aims at characterizing the interannual variability of precipitation in the Seine watershed in relation to that of the North Atlantic Oscillation (NAO). The precipitation in the Seine watershed is characterized by a long-term tr...
The temporal variability of water-level fluctuations in the chalk aquifer of Upper Normandy, France is constrained by natural climate fluctuations and is closely linked to the regional geological patterns. The chalk plateaus are covered with 5-50 m thick semi-permeable surficial formations; the thickness of the underlying chalk aquifer varies from...
