A New Dynamic of Saharan Agricultural Transformation: Thermal Area of Zelfana (Southern Algeria)

The Agricultural Land Development Program has led to an increase in agricultural areas in Zelfana (Algeria) as in other Saharan regions. The creation of development areas in this zone has generated a certain progress through a set of measures that have had different impacts on the components of this Saharan agro-ecosystem. The objective of this research is to study the realities of the new dynamics of Saharan agriculture through the diversity of agrarian systems established in the oasis of Zelfana and its extensions. The results of the management study of this particular agro-ecosystem have shown inadequacies at different levels that could compromise its sustainability and even its dynamics. The measures to be taken are discussed not only to preserve the ecosystem but also to give meaning to the strong investments made by the public authorities

A New Dynamic of Saharan Agricultural Transformation: Thermal Area of Zelfana (Southern Algeria)

The Agricultural Land Development Program has led to an increase in agricultural areas in Zelfana (Algeria) as in other Saharan regions. The creation of development areas in this zone has generated a certain progress through a set of measures that have had different impacts on the components of this Saharan agro-ecosystem. The objective of this research is to study the realities of the new dynamics of Saharan agriculture through the diversity of agrarian systems established in the oasis of Zelfana and its extensions. The results of the management study of this particular agro-ecosystem have shown inadequacies at different levels that could compromise its sustainability and even its dynamics. The measures to be taken are discussed not only to preserve the ecosystem but also to give meaning to the strong investments made by the public authorities

Flash flood risk and climate analysis in the extreme south of algeria (the case of in-guezzam city)

Natural risks, particularly flood risk, are a topical subject in Algeria and throughout the world, particularly given the last major catastrophic floods in Sudan (2020) and North Africa. With the development of the climate change phenomenon in the world, risk management is becoming increasingly necessary for all the actors concerned (decision-makers, technicians, and the population) to identify protection issues. In 2018, in the extreme south of Algeria, In-Guezzam City suffered a devastating flood that caused significant damage and loss of human and material resources. More than 100 homes collapsed, and approximately 345 families were displaced. Currently, there is no research work to assess the hydrological situation and the risk of flooding in this region. Therefore, the main purpose of this study is to shed light on the risk of flash floods in the extreme south of Algeria with more specific attention to the August 2018 floods as well as the climate trends over the past 30 years using Mann–Kendall test and Sen’s Slope Estimator. The chosen approach involves a hydrological study and hydrodynamic modeling using HEC-RAS software. This latter allows for simulating floods using statistical methods and creating several regional flood hazard maps

Reliability and Problems of Wastewater Treatment Processes in the Algerian Sahara

This modest chapter deals more particularly with the reliability and the problems of the different processes used at the level of several treatment plants installed in the Algerian Sahara with the aim of eliminating the nuisances and the risks of contamination in the urbanized areas, protecting the receiving environment and water resources, the possibility of reusing treated effluents for irrigation. Through an evaluation of the performance of these stations after years of operation which confronted with climates such as the high temperature and evaporation and the impact of the sand winds on the efficiency of the basin, technical and anthropic problems such as the salinity and mismanagement of the waters on the other hand

Contribution à l’étude de l’écoulement uniforme dans une conduite en fer à Cheval

Notre travail s’est intéressé à l’écoulement uniforme dans une conduite de forme fer à cheval, l’étude s’est basée sur les relations de Chézy et de Manning, L’analyse de l’écoulement à été menée d’une part à coefficient de résistance constant et coefficient de résistance variable .En se basant sur la relation général de débit volume, le coefficient de résistance à l’écoulement de Chézy et coefficient de rugosité de Manning ont été exprimés. Leur représentation graphique a montré qu’ils passent tous deux par un maximum. En absence du diamètre de la conduite .la méthode de modèle rugueux permis de calculer ces coefficients par des relations explicites applicables dans tout le domaines de l’écoulement turbulent , Une étude particulière de l’écoulement critique a permis notamment de proposer une excellente relation approchée au calcul de profondeur critique

Water management and the agricultural development constraints in the Algerian Sahara: case of the M'Zab Valley

In Algeria, modern agriculture was introduced in the Saharan region through the implementation of the law n° 83–18 of August 13, 1983, relating to access to agricultural land ownership (Fr. Accession à la Propriété Foncière Agricole (APFA) in French). This law was hugely successful and sparked a real enthusiasm for this type of activity, which resulted in an expansion of agricultural areas at the M’Zab level, similar to that observed in other Saharan regions. Over the past decades, the agricultural area has declined markedly (–0.4%), which was due to multiple causes, including ecological problems, such as urban discharges and the rise in the water level. So far, little research has been done to assess the agricultural situation and irrigation in this region. The objective of this work is to analyse and discuss the constraints and impacts of water and agricultural management on sustainability of the ecosystem in the Saharan environment. This work is based on extensive research, which has been carried out in the M’Zab region on the oasis system and its evolution. It was enriched with dozens of direct surveys, performed among farmers working in agricultural areas. The results show that agricultural development and the sustainability of farms in this region face several technical and social constraints, the most important of which are the workforce-related problems and water management. Several measures have been recommended to be taken not only to preserve the ecosystem but also to give significance to the large investments made by the public authorities