The main objective of this study is to establish a perspective orientation of urban growth in an arid region (Biskra and its neighboring oases) in south east Algeria by mobilizing the capacities of attractiveness. Taking into account climatic parameters (wind speed and temperatures) and physical parameters (land cover, slopes, and distance from roads), our approach is based on remote sensing techniques of satellite data classification and Geographic Information Systems for spatial analysis. By means of a multi-criteria analysis a decision support map of sites suitable for future urban dynamics was carried out. The results obtained show that 48% (or 71,782.25 ha) of the study area is located on land with very low sensitivity to urbanization. 9.45% at high sensitivity, 29.13% at medium sensitivity, while 13.41% at low sensitivity. The medium sensitivity zone occupies a considerable area estimated at 29.13% (a total of 43,577.58 ha). Spatially, this is reflected in uncontrolled urban sprawl to the detriment of oases and agricultural land, or land not suited to the requirements of climatic comfort in arid regions. This urbanization sensitivity map forms the basis of the prospective design of an urban model adapted and appropriate to the conditions of the oasis ecosystem through the integration of other climatic parameters.

According to a United Nations report, the proportion of the urban population living in informal houses worldwide had reached 23.5% in 2018, which means over 1 billion people have been living in slums, and an estimated 3 billion people will be requiring affordable housing by 2030. Slums are often linked to developing countries, where weak governance and misled socio-economic choices aggravate the situation and lead to continual conflict with the authorities. This research aims to model this conflict through Game Theory and shed the light on the different parameters that influence the decision-making process and finally propose a management model to limit the spread of this phenomenon as much as possible. This model will be applied in the city of Hassi Bahbah using ABM, the results of the game modeling allowed us to extract the delta threshold which will allow decision-makers to know when they have to make decisions. Our study aims to offer decision-makers a tool based on our model, allowing them to better manage and thus monitor the evolution of informal houses. The authors hope that the findings could provide means and insights for policies and strategic directions in land uses and planning systems.

• The research paper aims to create development region, as itis a means for reorganizing the potential for development, as the research work dealt with a systematic vision based on the merging of the results of statistical analysis with the principles adopted in regional divisions, we have identified three regions with different developmental characteristics; the north eastern developmental region, the Constantine development region and the eastern high plains region. The results of the work are shown in a map of development regions were the final outputs of the research paper are prepared.
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The main objective of this study is to establish a perspective orientation of urban growth in an arid region (Biskra and its neighboring oases) in south east Algeria by mobilizing the capacities of attractiveness. Taking into account climatic parameters (wind speed and temperatures) and physical parameters (land cover, slopes, and distance from roads), our approach is based on remote sensing techniques of satellite data classification and Geographic Information Systems for spatial analysis. By means of a multi-criteria analysis a decision support map of sites suitable for future urban dynamics was carried out. The results obtained show that 48% (or 71,782.25 ha) of the study area is located on land with very low sensitivity to urbanization. 9.45% at high sensitivity, 29.13% at medium sensitivity, while 13.41% at low sensitivity. The medium sensitivity zone occupies a considerable area estimated at 29.13% (a total of 43,577.58 ha). Spatially, this is reflected in uncontrolled urban sprawl to the detriment of oases and agricultural land, or land not suited to the requirements of climatic comfort in arid regions. This urbanization sensitivity map forms the basis of the prospective design of an urban model adapted and appropriate to the conditions of the oasis ecosystem through the integration of other climatic parameters.

The majority of dams in Algeria have some thirty years lifetime, when it comes to tanks intended for drinking water supply or irrigation whose socioeconomic interests justify an unlimited service guarantee. It matters to predict the water retention filling rate and protect these dams from siltation that seems very acute. This paper deals with the problem of siltation in Foum Lgherza dam, in the East Algeria. We attempt to identify siltation behavior according to a detailed analysis based on the comparative approach between results obtained by a projected relationship for the study area, and the measuring results obtained by bathymetric surveys, both of results are very close and determine the aggressiveness of erosive balance and accelerated siltation.