Résumé:
Water is a determining factor for many human activities such as agriculture, the production of
electricity or the supply of drinking water. It is one of the main factors in the construction of
an economy, developed in all countries of the world, facing the dangers associated with it,
such as floods and drought. This is one of the greatest challenges of sustainable human
development.
Climate change is a reality widely recognized today in the scientific community, which
facilitates the increase in the frequency and intensity of water-related disasters, considered
completely uncontrollable, leading to socio-economic losses. Huge savings. These changes
may be due to processes intrinsic to land and human activities.
Climate change raises many questions about the future of hydrological extremes, particularly
floods. The problematic of the present work is to study the variation of hydropluviometric
trends and to describe the evolution observed at the time series of the hydrological extremes
of the Ch�liff watershed.
In this context, a detailed analysis of the hydroclimatic conditions was carried out over the
period 1969-2009 from all available rainfall and hydrometric data. This analysis made it
possible to use statistical tests dedicated to the detection of trends of the series.
Precipitation has shown significant decreasing trends exceeding 40%, where annual flows
represent a clear downward trend in the region. These results ultimately lead to a reduction in
water resources in the Ch�liff basin that exceeds 45%.
The decrease in rainfall, together with the increase in population at the expense of vegetation
cover, is driving trends in increasing the maximum annual flow Qmax and Qpic2 in the
North-western basin. Declining trends are recorded in the northern part of the basin, resulting
in reduced of rainfall and man-made changes to the basin's watercourses, and in particular the
creation of dams.indowId
