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Abstract:The objective of this study was to follow-up on the evolution of the hydro-pluviometric schemes and particular elements of Wadi Mina (6048 km 2 ) to the Sidi M'Hamed Ben Aouda Dam to evaluate the silting origin and status of this dam situated in the northwest of Algeria. The pluviometric study targeted a series of rains during 77 years , the liquid discharge data cover a period of 41 years and the solids and suspended sediment concentrations data cover very variable periods, starting from 22 to 40 years for the entire catchment area. The statistical tests for ruptures detection on the chronological series of rains and discharges indicate a net reduction of rains of more than 20% on the entire basin since 1970. The evolution of solids inputs was quantified: the maximum values are registered on autumn start and at the end of spring. The Wadi Mina basin brings annually 38 × 10 6 m 3 of water with a specific degradation of 860 t·km −2 ·year −1 . By comparing the results found, we thus observe that the basin upstream of SMBA (1B) Dam is the greatest sediment producer towards the dam because it shows a specific degradation equal to 13.36 t·ha −1 ·year −1 .

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Abstract The objectives of this study are to modeling the spatial distribution of Covid-19 at the regional scale (Case of Algeria) based on geostatistcal study of covid-19 cases spatial distribution and Hybrid Kriging. The data analysis of a published officially Covid-19 reports by the Algerian Ministry of Health. a map of contamination by covid-19 has been obtained and a new model of risk evaluation has been developed and proposed to predict the propagation of this pandemic in Algeria. To conclude this work show areas with high population density are most exposed to virus propagation and death arising. Simulation show that infection by Covid-19 will arise to 14 000 cases in Algeria in the last of April also the velocity of transmission of this virus is rapid. Map obtained help the local authority to manage Covid-19 infections at the spatial scale.