Mohamed Meddi

École Nationale Supérieure d'Hydraulique · ID

The Cheliff watershed features a considerable expanse from east to west, beginning with M'Sila to Mostaganem, as seen from this expanse, with great climatic, topographic, geological diversity, etc., hence the magnitude of the solid transport phenomenon and therefore the resulting siltation. The scarcity of the region's water resource (average 450 m...

This study assesses flood risk in the Oued Seddouk watershed, a sub-watershed in the eastern Soummam watershed, located in the Seddouk province of Bejaia. Using ArcMap, a detailed hydrographic network and watershed boundary were delineated from a Digital Elevation Model (DEM). Key river channels of the 4th and 5th orders were isolated, converted to...

The study aims to investigate surface water (SW)–groundwater (GW) interactions in the Mitidja Plain (northern Algeria), taking into account the impacts of human activity and climate change emphasizing the alignment with Sustainable Development Goals, Clean Water and Sanitation, and Climate Action. The dynamic interactions between the El Hamiz River...

The primary goal of this study is to predict the current and future water quality index for irrigation (WQII) of the western Mitidja alluvial aquifer in northern Algeria. The modified WQII was used to evaluate groundwater suitability for irrigation through geographic information system (GIS) techniques. Additionally, a long short-term memory (LSTM)...

The scarcity of surface water resources has a significant impact on Mediterranean basin. This study aims to assess the climate change impacts on surface water resources in the Mitidja plain in Algeria. Two pre-calibrated monthly water balance models, namely, the GR2M model and the abcd model, were used. These models were driven by bias-corrected da...

The objective of this study was to examine drought using the Streamflow Drought Index (SDI) at various time scales and its temporal evolution using monthly streamflow data from 1973 to 2009. Streamflow records were collected from a network of 14 hydrometric stations distributed throughout the study area. The Akaike Information Criterion (AIC) and t...

Algeria, a semi-arid Mediterranean country, is distinguished by a more marked interannual variability in solid inputs compared to liquid inputs. This study aimed to comprehensively analyze hydrometeorological variables, such as rainfall, suspended sediment load, and flood flows in the Wadi Mina basin (6048 km²), using both traditional and advanced...

Abstract: Extreme precipitation events play a crucial role in shaping the vulnerability of regions like Algeria to the impacts of climate change. To delve deeper into this critical aspect, this study investigates the changing patterns of extreme precipitation across five sub-regions of Algeria using data from 33 model simulations provided by the NA...

Extreme precipitation events can have a significant impact on the environment, agriculture, economy and safety, making close monitoring of their short‐ and long‐term trends essential for the development of effective mitigation and adaptation strategies. In this study, we analysed 16 in situ observation datasets from four different climate zones in...

The average annual precipitation values in the Cheliff-Zahrez basin range from 80 to 600 mm/an, indicating a semi-arid climate. This work revolves around a new drought exceedance probability index (DEPI), a standardized precipitation index (SPI) and effective drought index (EDI) in different time scales (3, 6, 9, 12 and 24) derived from monthly pre...

Since a trend towards aridification is expected in Algeria, as in the countries of the Maghreb and the Mediterranean basin, changes in precipitation and temperature can have a significant impact on various water and energy balance processes and, consequently, on surface soil moisture (SSM). The latter is an important measure for monitoring and even...

The average annual precipitation values in the Cheliff-Zahrez basin range from 80 to 600 mm/an, indicating a semi-arid climate. This work revolves around a new drought exceedance probability index (DEPI), a standardized precipitation index (SPI) and effective drought index (EDI) in different time scales (3, 6, 9, 12 and 24) derived from monthly pre...

The Maghreb countries located in North Africa are strongly impacted by floods, causing extended damage and numerous deaths. Until now, the lack of accessibility of river discharge data prevented regional studies on potential changes in flood hazards or the development of regional flood frequency estimation methods. A new database of daily river dis...

The choice of the reference flood for the dimensioning of hydraulic structures is rather delicate, in particular in the not gauged basins. In these basins, the estimation of the project flood requires the use of predetermined methods based on the maximum daily precipitation. In this context, this work consists of evaluating the impact of seasonal c...

The study area is in the Ghrib–Cheliff sub-watershed, extending over ~1380 km2 and is located ~100 km South-West of Alger. The proposed model was tested using monthly data, total rainfall (R), peak discharge (Qmax), and suspended sediment load (SSL). Data is obtained from Ghrib stations (hydrometric and rainfall) located on the Cheliff wadi. Twenty...

Infiltration is an important part of the hydrological cycle, and it is one of the main abstractions accounted for in the rainfall-runoff modeling. The main purpose of this study is to compare the infiltration models that were used to assess the infiltration rate of the Mitidja Plain in Algeria. Field infiltration tests were conducted at 40 differen...

Soil moisture is a key parameter of soil monitoring for observation of vegetation growth, predicting crop production, and improving water resource management. In this study, the objective is to compare the evolution of soil moisture in different mulches to determine the best mulch and its characteristics of infiltration in the soil. The experiment...

Due to rapid population growth over time, the importance of freshwater is increasing, and the availability of this vital resource is becoming progressively more challenging. Consequently, the exploitation of untapped water sources becomes a necessity. With industrial development, groundwater is increasingly exposed to various contaminants by infilt...

Cette communication a pour but d'aborder la problématique de la sécheresse. Ce phénomène menace depuis quelques décennies les terres agricoles comme le cas du haut et moyen Cheliff représenté par la wilaya d’Ain Defla située dans le nord-ouest de l'Algérie. A travers cette étude, nous avons traité l'impact de ce fléau sur les ressources en eau sout...

The climate change became a serious global issue, clearly manifested by disruptions in precipitation patterns, increasing temperatures, and a number of catastrophic disasters. This issue has exceeded national boundaries and has become a worldwide dilemma that is significantly affecting our planet.

Over the last few years, the Eastern Middle Cheliff plain has witnessed remarkable economic growth, particularly in the agricultural sector. However, the overexploitation of the alluvial aquifer, coupled with agricultural practices involving the use of fertilizers and pesticides, significantly contributed to the degradation of groundwater quality....

When designing policies and programs, it is important to consider the limitations of adaptive capacity, of the population in certain contexts of extreme events. This may require a transformation of the systems themselves, so as to build resilience. Building resilience to climate change will require the incorporation of climate change adaptation and...

Rainfall erosivity is a critical factor affecting soil erosion and agricultural productivity. This study aims to analyze rainfall erosivity in the northern region of Algeria using a hybrid approach that combines empirical and modeling techniques. The primary objectives are to identify homogeneous regions, assess their susceptibility to climate chan...

In this study, a statistical analysis of historical and projected values of the annual, seasonal, and supra-seasonal precipitation concentration index (PCI) was conducted for different stations in the Cheliff watershed. Statistical methods such as breakpoint and trend analysis using Pettitt and Mann-Kendall tests were used for the PCI values of ann...

The main objective of this work consists of classifying 30 brands of water bottled and marketed in Algeria, based on their physicochemical compositions and their comparison with some foreign brands recognized in their countries or on a world scale. Relevant to this, descriptive statistics, as well as hierarchical ascendant classification (HAC) and...

In semi-arid areas, the conservation of water resources and use of recent technologies is a priority for agriculture. The objective of this work is to evaluate the functionality and accuracy of the SAMIR (SAtellite Monitoring of Irrigation) model outputs at the plot scale by estimating evapotranspiration and irrigation water volumes for agriculture...

The quantification of sediment rates is essential for making a development plan in order to protect soil and hydraulic infrastructure against erosion. The general aim of this work is to estimate soil erosion rate in the Medjerda basin (between Algeria and Tunisia) using remote sensing, GIS and RUSLE with different models of the erosivity of rain.Th...

Coastal aquifer overexploitation represents a concerning trigger for water salinization around the world and especially in arid and semi-arid regions along with urban growth and urbanization, as well as land use human-induced changes. This study aims to assess the groundwater quality in the Mitidja alluvial aquifer (northern Algeria) along with its...

The interaction between surface water and groundwater systems has a significant impact on the hydrological cycle, which also has a significant impact on water resource management and ecosystems. Indeed, these interactions affect both the quantity and quality of the water supply. Moreover, climate change highlighted the weaknesses of water supply ma...

This work aimed at evaluating the impact of human activity and geology on the surface water quality of the Ouled Mellouk dam (northwestern Algeria). Specifically, methodology aims to assess seasonal variations of several parameters (EC, TDS, pH, SO42−, Cl−, Ca2+, Na+, HCO3−, NO3−, PO43− and Mg2+, organic matter, suspended solids, BOD5, COD) from 20...

Drought is one of the most severe natural disasters worldwide, but with a particular emphasis in sub-humid and semi-arid climates. Several indices have been created to appropriately identify drought’s characteristics and variability. The main objectives of this study consisted of analyzing the behavior of different indices applied in northeast Alge...

One of the most common types of soil degradation is water erosion. It reduces soil quality at the erosion site and may cause sedimentation issues at the deposition site. This phenomenon is estimated using a variety of models. The Revised Universal Soil Loss Equation (RUSLE) model is the most often used, due to its consistence and low data requireme...

L'eau est une ressource naturelle précieuse et essentielle pour de multiples usages. Son utilisation des fins alimentaires ou d'hygiène nécessite une excellente qualité physico-chimique. Pour apprécier la qualité des eaux de puits destinées à la consommation humaine dans la région Ain Defla qui est située au Nord-est de l'Algérie, un contrôle physi...

Résumé L'érosivité des précipitations (ou érosion hydrique) a de graves conséquences sur l'agriculture, l'eau et la gestion de l'utilisation des terres. Cette étude a pour but de créer une carte actualisée du facteur R d’érosivité pour l’Algérie du nord et ses principales zones de production agricole. Sur la base d'un plus grand nombre de stations...

Maghreb countries are strongly impacted by floods, causing twice as many deaths as in southern European countries in recent decades. However, due to the lack of data accessibility, there are no studies to analyze whether the frequency or intensity of floods are changing at the regional scale. In this work, a recent database of daily river discharge...

Maghreb countries are strongly impacted by floods, causing twice as many deaths as in southern European countries in recent decades. However, due to the lack of data accessibility, there are no studies to analyze whether the frequency or intensity of floods are changing at the regional scale. In this work, a recent database of daily river discharge...

Climate change is the most important topic in climate research in the last decades and is still one of the main challenges today. In addition, large regions of the world are still poorly assessed due to accessibility difficulties, especially in semi-arid regions. the world is still poorly assessed due to accessibility difficulties, especially in se...

RESUME Située sur la rive méridionale du bassin méditerranéen, l'Algérie est un vaste territoire, de près de 2,5 millions de kilomètres carrés, qui s'étend vers le sud jusqu'à la latitude de 18°57' Sud. Les trois quarts de l'espace algérien sont soumis aux influences climatiques hyperarides, arides et semi-arides. Les plaines littorales (1 200 km d...

Le nord-ouest de L'Algérie est menacé par la sécheresse et la rareté de l'eau attribue pour l'irrigation; a cause de l'extension urbaine qui a engendré une demande accrue de l'eau à des usagers différents (alimentation en eau potable; irrigation et industrie). Cette étude consiste à évaluer l'impact de l'activité humaine et la lithologie sur la qua...

It is important to investigate the response of hydrological drought to meteorological drought and its influencing factors, which might help better to understand drought evolution mechanisms and facilitate its monitoring and forecast. For example, in the western part of Algeria, the frequency of droughts events increased with considerable impact on...

L'érosion hydrique est la source majeure de la dégradation des sols dans les bassins versants en Algérie du Nord et en particulier le bassin du Cheliff qui représente un exemple concret de cette dégradation. En effet, le Cheliff est soumis à des conditions hydro-climatiques défavorables, caractérisées par des précipitations irrégulières, avec des v...

The number and intensity of climate shocks have increased over the past decade. But beyond the simple curves and statistics, the issue that divides the scientific community is the question of responsibility: natural climate variability or anthropogenic climate change? Researchers are adamant that there is a link between human activities and the int...

La zone étudiée fait partie du sous bassin du Chélif-Tikazale, qui se trouve au Nord-ouest du bassin du moyen Chélif. Cette zone est caractérisée par un climat semi-aride. L'objectif principal recherché dans ce contexte est d'arriver à étudier de l'impact de la qualité des eaux souterraines destinent à l'irrigation sur la salinisation des sols dans...

The consequences of very active erosion in regions with semiarid climates, like the countries of North Africa, are the premature siltation of dams and soil losses on farmland that can have serious repercussions on the reduction of soil productivity. These problems directly impact water availability and food security to ensure sustainable socio-econ...

The frequency of drought events in the Mediterranean region has increased significantly in recent years, along with a substantial increase in their spatial and temporal extent. These events are associated with high temperatures and low precipitation. Our study presents a vision on the impact of temperature on agricultural drought frequency, severit...

The design of hydraulic infrastructure requires careful evaluation of extreme precipitation events. This paper presents an estimation of extreme precipitation events based on the Probable Maximum Precipitation (PMP) concept. The PMP approach is useful in determining probable maximum flood (PMF), which is required for the design of large hydraulic s...

Reservoir dams are critical to agriculture, industry, and the needs of humans and wildlife. This study evaluates the water quality of the Ghrib reservoir in north west of Algeria, using Irrigation Water Quality Index (IWQI), sodium absorption rates (SAR) and multivariate statistical methods (Clustering and principal component analysis). The study c...

The proposed study aims to assess groundwater quality and suitability of the Upper and Middle Cheliff plains (northwest of Algeria) for irrigation and drinking. Here the groundwater is the main source for domestic, agricultural and industrial activities similarly to any other region of the world. The suitability for drinking and for irrigation was...

La région du Moyen Cheliff Oriental qui fait partie du grand bassin du Cheliff est située au nord- ouest de l’Algérie. Ces dernières années, ladite région a connue une croissance économique remarquable, en particulier dans le secteur agricole. La région est caractérisée par un climat semi-aride. Ces facteurs ont contribué d’une manière significativ...

Soil degradation is a serious and extensive problem in many areas in Algeria. Information on soil loss is essential to support agricultural productivity and natural resource management. In this study, remote sensing and GIS are used in order to map and assess water erosion in the Wadi Cheliff basin. The study area is characterized by a great irregu...

This study investigates the effect of autocorrelation on temporal trends and step change on a monthly, seasonal and annual temperatures of six meteorological stations over the North of Algeria. Afterwards, links between the general atmospheric circulation, via six climate indices, and temperature data are examined. The trends in temperatures are an...

Algeria is one of the countries affected by water erosion. This phenomenon removes the top layer and leads to a degraded soil. This study includes an estimation of water erosion in Wadi El Hachem watershed using the Universal Soil Loss Equation (USLE) model combined with geographical information system and remote sensing techniques. The average ero...

In Northern Algeria, the CheliA watershed has been severely aAected by a decline in runoA since the 1970s due to a decrease in rainfall. However, the sensitivity of watersheds to this decline is variable and involves complex processes. This basin contains several dams that supply the population with water for drinking as well as for irrigation purp...

In Northern Algeria, the Cheliff watershed has been severely affected by a decline in runoff since the 1970s due to a decrease in rainfall. However, the sensitivity of watersheds to this decline is variable and involves complex processes. This basin contains several dams that supply the population with water for drinking as well as for irrigation p...

Remote sensing and geographic information systems are very effective when studying land cover evolution and detecting changes. This research has been carried out in the Medjerda watershed. It is aimed to study the dynamism of land cover from multiple satellite images from 1994 to 2017 as well as the evolution of the C factor and its relationship to...

The demonstration of the main phenomena and the predominant chemical reactions in this evolution as well as the qualitative estimation of this water plus the comparison with the norms of the World Health Organization (W.H.O.), indicated that the positive (+) and negative (-) ions have a direct relationship with the geological and hydrogeological ch...

Remote sensing and geographic information systems are very effective when studying soil erosion and land cover evolution and detecting changes. This study was carried out in the Medjerda (with these Algerian and Tunisian basins). Its aims are to study the dynamism of land cover from multiple Landsat satellites images from 1994 to 2017 and to verify...

The search for models linking hydroclimatic parameters (precipitation, runoff and/or solids transport) has been the subject of numerous studies, the objective of which was to explain the phenomena of runoff and solids transport and to highlight relationships that could be applied to ungauged basins. Climatic and geomorphological characteristics dif...

Les ressources en eaux souterraines des plaines du Haut et Moyen Chéliff, ont une signification particulière dans le développement de la population et l’activité agricole de la région.ces dernière année, des signes de contamination chimique de cette ressource ont été signalés dans la majorité des points d’eau des plaines. Deux compagnes de prélèvem...

Soil erosion is a major problem in the Maghreb countries. The consequences of this phenomenon are disastrous, with soil degradation, production of vast areas that are agriculturally sterile, besides agricultural drought conditions aggravated by the increase in runoff compared to infiltration, which leads to a decrease in soil water reserve. This ph...

Au Nord de l'Algérie, le bassin versant de l‘Oued Cheliff est fortement affecté par une baisse des débits depuis les années 1970. La diminution des précipitations en est la cause principale. Le développement de modèles efficaces est plus que nécessaire pour une meilleure évaluation des potentialités et des risques à court, à moyen et à long terme...

Le taux de sédimentation des barrages du bassin hydrographique du Cheliff reste le plus élevé de toutes les régions de l'Algérie. L'oued Mina est un affluent majeur de l'oued Cheliff, le plus grand oued de l'Algérie qui transporte un taux de sédiment important et le barrage de Sidi M'Hamed Ben Aouda (Relizane) qui barre cet oued a reçu un volume de...

The FRIEND-Water program (FWP) is the oldest and the most transverse program (i.e. Flagship Initiative) within the Hydrological Intergovernmental Program (IHP) from UNESCO. FRIEND means “Flow Regimes from International and Experimental Network Data”. The FWP is dedicated to allow large communities of hydrologists and associated disciplines to colla...

La perte de sol est l'une des principales préoccupations environnementales dans le monde et touche principalement les régions tropicales et subtropicales. L'érosivité des précipitations est un paramètre de l'équation universelle révisée de perte de sol (RUSLE) étudiée à l'échelle du bassin à l'échelle du pays est essentielle pour étudier l'étendue...

La région du Haut et du Moyen Chéliff a connu ces dernières années une importante activité agricole. Cela est du au dispositif d'aide de l'état mis en place depuis l'année 2000 et 2001. La ressource en eau souterraine dans les régions semi-arides constitue le facteur limitant tout essor économique. La croissance démographique, la modernisation de l...

An effective drought forecast is an important measure to mitigate some of its most damaging impacts. In this study we compare the effectiveness of two models: Markov Switching Model (MSM) and Robust Regression Model (RRM) with three different approaches to forecast hydrological drought events in the north-west of Algeria using Standardized Runoff I...

La région du Haut et du Moyen Chéliff qui fait partie du grand bassin du Chéliff est située au nord-ouest de l’Algérie. Les plaines du Haut et du Moyen Chéliff couvrent 1070 km2 dans une cuvette synclinale à remplissage Mio-Plio-Quaternaire où la nappe du Mio-Plio-Quaternaire constitue la principale source d’approvisionnement en eau potable et l’ir...

Fontaine of gazelles, a zoned earth dam with rock fill shoulders and central clay core, experienced seepage through its foundation, has appeared since December 2004, due to rainfall and direct effect of fault after the impounding. The dam is located in the southeast of Algeria, 42 m in height, was constructed for irrigation purposes. According t...

. The prediction of flows upstream of the SMBA dam was carried out on the basis of RCA4 regional climate simulations of precipitation and historical temperatures over the period 1981-2005 and then projected for the near future 2025-2050 with an assessment of two Representative Concentration Pathway RCP4.5 and RCP 8.5.

ABSTRACT This study concerns the irrigation perimeter of Upper Cheliff (Plains of El Khemis and El Amra-Abadia, located in northwestern Algeria), it deals with the main indices related to the exploitation of Large Irrigated Perimeters of the Cheliff valley which has its main adductor, the Cheliff wadi, with over a length of 730 km. Through the resu...

The Cheliff–Zahrez plains in Algeria are known for their fertility and agricultural production. The water deficit of the last decade has had a negative impact on agricultural production due to the scarcity of surface and underground supply resources. This paper sheds light on the weather, drought risk concerning crop irrigation in wheat yield cases...