- Docteur en hydrologie et gestion des hydrosystèmes .edit
The extent of erosion and solid transport in the watersheds of the Mediterranean semi-arid zones has aroused the interest of many researchers, who have multiplied in the last decade the studies to understand and explain the mechanisms,... more
The extent of erosion and solid transport in the watersheds of the Mediterranean semi-arid zones has aroused the interest of many researchers, who have multiplied in the last decade the studies to understand and explain the mechanisms, their causes and consequences. Hydrological measurements (liquid flows, concentrations daily averages) were carried out on the watershed of the upstream wadi Mellegue at the Laouinet station on a period of 29 years (1973/74-2001/02) by the services of the A.N.R.H of Algiers. The analysis of the instantaneous data taken at the station between 1973 and 1985 made it possible to show the importance of the statistical relationship between liquid and solid flow rates (QL-QS) and on the temporal level (seasons) the understanding of the hydrological phenomena in this basin. Solid flow rates in suspension are correlated with the daily average liquid flow rates, and we have been able to trace the curve of the solid transport which gives a regression of the power type QS = b QL a. The seasonal and daily scale is very representative of the phenomenon of solid transport. The results obtained by the application of this model are very encouraging because the correlation coefficients annual and seasonal liquid–solid flow rates vary between 0.85 and 0.95. The values the maximum solid intakes recorded during the spring season exceed the other seasons. This variability finds its explanation in the physical characteristics of the environment (soil condition, vegetation cover), the aggressive nature of the rains of spring when the annual PJ max of the month of May reaches 75 mm of rain /day. The average interannual solid intake to the outlet of the watershed is estimated at 570512.7 tons/year, with specific solid transport of 161 tons/km2/year. This value remains relatively low compared to those observed for other basins with a similar hydrological regime.
Keywords: Algeria, Medjerda, upstream Mellegue, semi-arid watershed zone, hydrology, specific solid transport "T.S.S", liquid flow rate.
Keywords: Algeria, Medjerda, upstream Mellegue, semi-arid watershed zone, hydrology, specific solid transport "T.S.S", liquid flow rate.
