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Pakistan Journal of Biological Sciences
  Year: 2006 | Volume: 9 | Issue: 5 | Page No.: 945-953
DOI: 10.3923/pjbs.2006.945.953
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Temporal and Spatial Variability of Runoff on a Mediterranean Agricultural Environment

Safar Marofi, Marc Voltz and Roger Moussa

This study examines the temporal and spatial variability of surface runoff in a 91 hectares cultivated watershed in Mediterranean environment of southern France. Hydrological response at different spatial scale is evaluated during wetness and drier phases included the within-year and the long-terms periods. The temporal analysis is done based on a simple classification of rainfall events of a hydrological cycle: (i) the wintry events, (ii) the summer storms and (iii) the case transitory. The spatial analysis is investigated in the case of main basin, 8 sub-basins and two farms scales, based on a spatial discretization. The experimental design involved monitoring of runoff (streamflow), water tables fluctuations and rainfall events, during hydrological cycles. During the experimental period, 175 storm runoff events were observed. The data analysis show that the annual runoff flows is insured for approximately 40% by floods and about 60% by recession periods. The flood events are classified in three groups, differentiated by the initial water table levels and their occurrence period. The results also show that the annual runoff changes appreciably according to the hydrological cycles and the rainfall variability that varies from 28 to 50% of total precipitation. In addition, the results indicate a non-linear response of runoff to rainfall events. They determine an important role of ditches on water infiltration and surface drainage. This double role varies in time and space as a function of climate and morphological characteristics of the environment.
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How to cite this article:

Safar Marofi, Marc Voltz and Roger Moussa , 2006. Temporal and Spatial Variability of Runoff on a Mediterranean Agricultural Environment. Pakistan Journal of Biological Sciences, 9: 945-953.

DOI: 10.3923/pjbs.2006.945.953






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