Abstract
The objective of the present study is to present the parameters of the hydrological assessment of a steppe area from the data of remote sensing. ¶Adopted methodology rests on the cartography of the various parameters of the hydrous and energy balance on one year scale. ¶Several methods are used. ¶Thus, for cartography of precipitations, one uses in a combined way the relief, the distance of the sea and the exposure. ¶The second method is used for the cartography of the streaming on an each pixel scale. ¶This method utilizes a matrix which calls upon the information contained in space variability and information resulting from the first method. ¶The combination of information of precipitation and the streaming allow the development of the chart of infiltration. ¶The third method consists with the estimate of the evapotranspiration on broad scale. ¶This last method uses images AVHRR and the model of assessment of energy Surface Energy Balance Algorithm for Land (SEBAL). ¶The quality and the space precision of these cartographies using imagery NOAA AVHRR open a broad hydrological field of application and can be extended for the exploration of all the Algerian steppe area.¶ Key words: Balance of water¶, Brezina, mapping, surface energy balance algorithm for land (SEBAL), energy balance.
Highlights
The arid regions cover approximately 40% of the surface of the grounds world (Dregne et al, 1991; Standish-Lee et al, 2005; Bridget et al, 2006) and accommodate 2 billion people, of which 90% live in the developing countries
The objective of the present study is to present the parameters of the hydrological assessment of a steppe area from the data of remote sensing
For the analysis of the sensitivity one based on the average values of the various values on the scale of the catchment area
Summary
The arid regions cover approximately 40% of the surface of the grounds world (Dregne et al, 1991; Standish-Lee et al, 2005; Bridget et al, 2006) and accommodate 2 billion people, of which 90% live in the developing countries These zones receive small and irregular quantities (in space and time) of precipitations (Goudie, 1987; Thornes, 1994â; Unganai and Mason, 2002; Lange and Leinbundgut, 2003). In Algeria, the arid areas are characterized in particular by steppe zones These last represent a space and privileged course of the extensive ovine breeding (Hirche et al, 2007). What led to a reduction in the potentialities of theecologicalsystems, socio-economicandbythereduction of the biological potential (Le Houérou, 1995; Aidoud, 1993; Bedrani, 1996; Senoussi and Bensemaoune, 2009)
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