Mohamed Elmehdi Saidi

Mohamed Elmehdi Saidi
Cadi Ayyad University | UCAM · Department of Earth Sciences

Professor

About

60
Publications
90,312
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400
Citations
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October 1996 - present
Cadi Ayyad University
Position
  • Research Director

Publications

Publications (60)
Article
Full-text available
Extreme climate events often have a significant and direct impact on social, economic, and environmental systems. This study is an attempt to characterize the current trends and future projections of extreme climatic indices in an arid region of Morocco on both an annual and a seasonal scale using 12 precipitation and temperature-based indices. The...
Article
Full-text available
Flood frequency analysis could be a tool to help decision-makers to size hydraulic structures. To this end, this article aims to compare two analysis methods to see how rare an extreme hydrometeorological event is, and what could be its return period. This event caused many deadly floods in southwestern Morocco. It was the result of unusual atmosph...
Article
Full-text available
The Mediterranean region is characterized by intense rainfall events giving rise to devastating floods. In Maghreb countries such as Morocco, there is a strong need for forecasting systems to reduce the impacts of floods. The development of such a system in the case of ungauged catchments is complicated, but remote-sensing products could overcome t...
Article
During the last few decades, the frequency of drought has significantly increased in Morocco especially for arid and semi-arid regions, leading to a rising of several environmental and economic issues. In this work, we analyse the spatial and temporal relationship between vegetation activity and drought severity at different moments of the year, ac...
Article
In this study, we apply statistical approaches based on frequency analysis and Artificial Neural Networks to map the 100-year monthly precipitation in a Moroccan watershed. This was accomplished by using assessed and corrected satellite-based rainfall products. A network of 10 rain gauges and six statistical validation criteria was used to compare...
Article
Full-text available
Ensuring water availability for agriculture and drinking water supply in semi-arid mountainous regions requires control of factors influencing groundwater availability. In most cases, the population draws its water needs from the alluvial aquifers close to villages that are already limited and influenced by current climatic change. In addition, the...
Article
Due to the lack of observed data, climate change impact studies are difficult to conduct. This paper evaluates the effect of climate change on water resources, in a Moroccan basin, using the Final Integrated Multi-satellitE Retrievals for Global Precipitation Measurement (GPM-IMERG-F) for precipitation and the European Reanalysis fifth generation (...
Conference Paper
Satellite-based and Reanalysis rainfall products could be a valuable source of data for precipitation for hydrological modeling over data-scarce regions. The objective of this study is to assess the suitability of ERA5 Reanalysis and GPM IMERG V06 data (GPM-Early, GPM-Late and GPM-Final) for flood modeling over a Moroccan semi-arid watershed (Rhera...
Article
This research aims at establishing an integrated modelling framework to assess the impact of climate change on water supply and demand across an arid area in the western Haouz plain in Morocco. Five general circulation models (GCMs) are used to evaluate the availability of future water resources under Representative Concentration Pathways (RCP4.5 a...
Article
The Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (GPM-IMERG) could be an alternative solution to the data lack problem. In this regard, this work examines the ability of this satellite-based rainfall products to simulate the flow in a Moroccan ungauged basin (Bourrous) by using the Soil Conservation Service–Curve Numbe...
Article
The Hydrological modelling in a semi-arid mountainous area is very challenging due to the irregular climate and the spatial variability of vegetation cover and topography. The hydrological model CEQUEAU was used with a daily time step on the arid and semi-arid mountainous region of the Ourika watershed. The capability of the model to simulate the d...
Article
Full-text available
In Morocco, the dynamics of change in rainfall patterns have been underway for decades. It is characterized by increasingly frequent and violent hydrological and climatic events (floods and droughts). This work aims to study the peculiarities and mechanisms of the appearance of floods in the watershed of the Oudodou wadi (Province of Tiznit - south...
Article
Full-text available
Here, we investigate the precipitation regionalization and the spatial variability of rainfall extremes, using a 47-year long station-based dataset from western central Morocco, a region with marked topographic and climatic variations. The principal component analysis revealed three homogeneous rainfall regimes, consistent with topographic features...
Article
Full-text available
A new precipitation dataset is provided since 2014 by the Global Precipitation Measurement (GPM) satellite constellation measurements combined in the Integrated Multi-satellite Retrievals for GPM (IMERG) algorithm. This recent GPM-IMERG dataset provides potentially useful precipitation data for regions with a low density of rain gauges. The main ob...
Chapter
Full-text available
يعد حوض أوريكا -بالأطلس الكبير الغربي- من بين الأحواض المغربية الأكثر عرضة للمخاطر الهيدرولوجية وخاصة خطر الفيضانات الذي يهدد الساكنة بين الفينة والأخرى. هذا في وقت يزخر فيه هذا الحوض بموارد طبيعية غنية، أبرزها المياه، والتربة، والغطاء النباتي. وهذا ما دفع بالمتدخلين في هذا المجال الجغرافي إلى عقلنة تدبير هذه الموارد، وإدراجها ضمن سياسة الدولة، اعت...
Preprint
Full-text available
The Mediterranean region is characterized by intense rainfall events giving rise to devastating floods. In Maghreb countries such as Morocco, there is a strong need for forecasting systems to reduce the impacts of floods. The development of such a system in the case of ungauged catchments is complicated but remote sensing products could overcome th...
Article
Full-text available
Flash floods are common in small Mediterranean watersheds and the alerts provided by real-time monitoring systems provide too short anticipation times to warn the population. In this context, there is a strong need to develop flood forecasting systems in particular for developing countries such as Morocco where floods have severe socioeconomic impa...
Article
Full-text available
The High Atlas of Morocco is a semi-arid mountainous environment that frequently suffers from natural hazards. For example, the watersheds upstream of Marrakech city are subject to extreme floods, caused by heavy rains. These episodes are frequent and often devastating, as was the August 1995 event that caused hundreds of deaths in the Ourika Valle...
Article
Full-text available
Purpose The purpose of this paper is to identify vulnerable areas for flood hazard and to analyze stakes exposed in touristic valley of Morrocan mountains. The three goals are: methodological (low-cost diagnosis without starting data), operational (to show the risk and identify avenues of prevention in Ourika) and incentive (to reproduce this on ot...
Conference Paper
Arid and semi-arid regions are often subject to flash floods. One of the most important tools for assessing flood intensity is the modeling of rain events. In the Tensift watershed, the frequency of past floods and their future predictions require a critical consideration of flood risk. In fact, the frequency of floods is increasing because of clim...
Article
Full-text available
RESUME Avec un caractère aride à semi-aride, le climat de la région de Marrakech-Safi est assujetti à des influences océaniques et continentales. Les villes d'Essaouira et de Marrakech, qui illustrent ces deux influences, enregistrent une grande variabilité temporelle des précipitations et des températures. Par ailleurs, des tendances nettes à l'au...
Article
In the Mediterranean region, floods are causing extended damages to the population and infrastructures. In Morocco, only a few studies have been conducted to understand flood processes while the vulnerability to floods is high. The goals of this study are to compare two modeling approaches for floods using either lumped or spatial rainfall and also...
Conference Paper
Full-text available
RSHS’18 is a meeting point for researchers from both the hydrology and remote sensing communities, and brings together their joint experiene in Earth Observation for developing innovative and environmentally-sustanaible water resources and basin management. It is focused on the use of the new generation of remote sensors and applications to hydrolo...
Thesis
La modélisation a une place centrale dans l’hydrologie moderne. Les modèles pluie-débit ont, à de nombreuses reprises, prouvé leur efficacité. En effet, la simulation des débits est indispensable à de nombreux secteurs économiques et pour la sécurité civile. L’objectif de ce travail est d’essayer d’étudier la zone d’Amizmiz en appliquant deux modèl...
Article
Full-text available
In the last few decades, drought has become a chronic phenomenon in Morocco. It began at the end of the 1970s and continued to the late 2000s. In the present study, hydrometeorological data sets, Standardized Precipitation Index method, and non-parametric tests were used to recognize the frequency and the severity of drought events during the perio...
Article
Full-text available
In the last few decades, drought has become a chronic phenomenon in Morocco. It began at the end of the 1970s and continued to the late 2000s. In the present study, hydrometeorological data sets, Standardized Precipitation Index method, and non-parametric tests were used to recognize the frequency and the severity of drought events during the perio...
Article
Full-text available
In spite of its geographical situation on the Atlantic and Mediterranean coast, Morocco is one of the most arid areas of the world; it experiences highly variable rainfall and recurrent droughts. Predictions of climate change consequences on several socio-economical fields in Morocco are very alarming. In fact, climate trends observed in Marrakech...
Conference Paper
La zone d’étude, qui s’étend sur une superficie de 5193 Km2, se situe à cheval entre les provinces d’El Haouz et de Chichaoua à une quarantaine de kilomètres de la ville de Marrakech. Ce secteur est composé de trois zones topographiques distinctes : une zone de montagnes du Haut Atlas, une zone de piémont et une zone de plaine. Les deux principaux...
Article
Full-text available
Within the context of climate change and increasing demographic pressures, problems of water resources variability have become particularly crucial. The management of arid watersheds, which are highly exposed to droughts and floods, needs to be supported by a thorough understanding of their susceptibility to these hazards. The watershed of Tensift...
Chapter
Full-text available
Obviously, floods have natural causes – heavy rainfall in the case of flash floods – nevertheless, their consequences depend strongly on urbanization and land use. On both sides of the Mediterranean, regions have been subjected to fast changes which have led to a concentration of assets in valleys and coastal areas (Plan Bleu, 2008). Changes in lan...
Conference Paper
Full-text available
1. Résumé : Ce travail se propose de contribuer à l'étude d'un milieu montagnard semi aride : le bassin versant de l'Oued R'Dat. L'oued principal prend source des hauts sommets de l'Atlas hercynien et trace sa trajectoire tout au long de paysages post-hercyniens jusqu'à l'exutoire de Sidi Rahal. C'est un milieu marqué par une grande diversité morph...
Data
Apport des logiciels de SIG dans la morphométrie des bassins versants L'exemple d'ArcGIS. Guide méthodologique d'utilisation. Mohamed El Mehdi SAIDI, Décembre 2013. Université Cadi A yyad Marrakech.
Article
Full-text available
This work is devoted to the simulation and spacialisation of natural flows at the Ourika Valley in Morocco. Subject to climatic and anthropogenic forcing, the valley's flood flows are, nowadays, extremely high compared to the average flow. Decadal and centennial floods simulation was undertaken using two software solutions. The floodplains mapping...
Article
Full-text available
Morocco, due to its location in the Mediterranean circumference, is vulnerable to present and future climate variability and climate change. Its surface water resources are becoming ever more limited and difficult to exploit. It might be expected that the warming of the hot season and drought would result in an increase in arid and semi-arid regime...
Article
Full-text available
The wadi Issil originates in the High Atlas of Marrakesh, at altitudes above 2000 m. The mountainous part of the watershed is characterized by significant slopes, a low-permeable bedrock and a widespread dense hydrographic network.Concerning precipitation, the upstream stations of the basin record heavy and high rainfall levels. The average value e...
Article
Full-text available
Le bassin versant du Ksob à Adamna est un hydrosystème du Haut-Atlas occidental de 1483 km² de superficie. Les précipitations sont, dans l’ensemble, conformes au milieu semi aride avec des hauteurs moyennes annuelles de 305 mm. A l’exutoire, l’écoulement superficiel est en moyenne de l’ordre de 24 mm par an (1,13 m3/s). Cependant les crues de l’oue...
Article
Full-text available
Le Haut Atlas de Marrakech est une zone géographique composée des bassins versants du N’Fis, de la Gheraya, de l’Ourika, du Zat et du Ghdat. Ces bassins versants sont situés sur le flanc nord de la haine montagneuse du Haut Atlas. Ils sont donc exposés aux flux perturbés océaniques en provenance du Nord et du Nord Ouest. Ces flux arpentent les vers...
Article
Full-text available
The watershed of the Ourika River is a part of the Marrakech hydrosystem of the High Atlas. In the montaneous part of the watershed, the bedrock has a low permeability, the vegetation is sparse on steep slopes and rare on the upper areas, the main valleys are narrow and deep. The N to NW exposure favours rain falls which are usually strong, short i...
Article
Full-text available
The watershed of the Ourika River is a part of the Marrakech hydrosystem of the High Atlas. In the montaneous part of the watershed, the bedrock has a low permeability, the vegetation is sparse on steep slopes and rare on the upper areas, the main valleys are narrow and deep. The N to NW exposure favours rain falls which are usually strong, short i...
Article
Full-text available
Situada en una zona semi-árida, en el extremo occidental del Alto Atlas, la cuenca vertiente del Ksob presenta una forma alargada con pendientes bastante importantes en las cuencas afluentes y sus vertientes. La mayoría de los afloramientos son bastante impermeables, compuestos principalmente por rocas carbonatadas jurásicas y cretácicas. Estas car...
Article
Full-text available
The watershed of the Ourika River is a part of the Marrakech hydrosystem of the High Atlas. In the montaneous part of the watershed, the bedrock has a low permeability, the vegetation is sparse on steep slopes and rare on the upper areas, the main valleys are narrow and deep. The N to NW exposure favours rain falls which are usually strong, short i...
Article
Full-text available
The watershed of the Ourika River is a part of the Marrakech hydrosystem of the High Atlas. In the montaneous part of the watershed, the bedrock has a low permeability, the vegetation is sparse on steep slopes and rare on the upper areas, the main valleys are narrow and deep. The N to NW exposure favours rain falls which are usually strong, short i...
Book
Full-text available
It is a great pleasure for me to write the forewords for this special issue of the International Scientific Journal for Alternative Energy and Ecology, devoted to France and french speaking (or partially french speaking) countries of the south. This volume is the result of a call for papers launched in june 2007 with the aim to give an overview on...
Article
Full-text available
In the High Atlas of Marrakech, the watershed areas are submitted to important and frequent floods, associated with landslide and rockslide. Morphological and lithological characteristics of the basins watershed have a clear influence on the rising waters strength and the hydrogram's shape. The products of erosion accumulated in the upstream part a...
Article
Full-text available
Water resources in a given watershed area are mainly related to the morphology of the basin and to the prevailing climatic conditions in the area. The exposure and orientation of the basin to rain-producing air masses are also determining factors. The watershed of Ourika lies on the northern side of the High Atlas between 1070 m and 4001 m, with an...
Article
Full-text available
Water resources in a given watershed area are mainly related to the morphology of the basin and to the prevailing climatic conditions in the area. The exposure and orientation of the basin to rain-producing air masses are also determining factors. The watershed of Ourika lies on the northern side of the High Atlas between 1070 m and 4001 m, with an...
Article
Full-text available
La région d'Ouarzazate est caractérisée par son climat aride à semi-aride. Les précipitations sont faibles (moins de 200 mm/an) et irrégulières. Les écarts de température sont importants et l'évaporation est forte (2800 mm/an en moyenne). Le barrage Mansour Eddahbi régularise un apport moyen annuel de 420 Mm3, dont 233 Mm3 constituent la contributi...
Article
Full-text available
Le bassin versant de l’Ourika, situé dans le Haut-Atlas de Marrakech, présente une forme allongée avec des pentes très importantes au niveau des affluents et des versants. Du point de vue lithologique, il est formé de roches cristallines du socle à la partie amont, et de dépôts silteux et argileux permo-triasiques plus tendres à l’aval. Ces terrain...
Thesis
Full-text available
"Lille-thèses, ISSN, 0294-1767"--Fiche header. Thesis (doctoral)--Université de Paris-Sorbonne, Paris IV, 1994. Microfiche.
Article
Full-text available
RÉSUMÉ. - Le basin du Souss se situe dans une zone du Maroc sub-saharien où interfèrent une aridité accrue en été, une irrégularité importante du régime de l'oued et une grande variabilité spatio-temporelle des pluies. Les crues du Souss apparaissent en saison froide de façon brutale et sont en générale de courte durée. Leur violence et leur grande...
Article
Full-text available
The Souss basin is situated in sub-saharan Morrocco, whose characteristics are an extreme aridity in summer, an important irregularity of river's regime and a great spatio-temporal varriability of rains. The floods of Oued Souss appear suddenly in the cold season and are commonly brief. Their violence and great speed of spreading are typical of flo...

Questions

Questions (9)
Question
Hello,
What would be the criteria that lead Scopus (or Web of Science) to remove journals from its indexing database? Thank you.
Question
Why the IDF curves are often fitted to the Gumbel distribution instead of testing the goodness-of-fit of other extreme‐value distributions (GEV, log-normal, Weibull, generalized Pareto, ... etc) ?
Question
Given the longer and longer wait time to give the first decision to accept or not a paper (by the editors), I would like to ask you :
As a reviewer, how long do you usually take to examine a paper? And what is your acceptance or refusal rate to review a paper (not the rate of reject or accept its publication). Thank you.
Question
Why do we usually use the letter "Q" to symbolize stream discharge? is it used in other sciences such as thermodynamics or fluid dynamics ... ?
thank you.

Projects

Projects (2)
Project
The climate change impact on water resources in arid and semi-arid areas