Dynamique de l'interface lithosphère-atmosphère au Burkina Faso. L'érosion en zone de savane

Abstract : BOOK I DEALS WITH WEATHERING AGENTS. THE CLIMATIC EXTREMES ARE STATISTICALLY ANALYSED WITH LONG DATA SERIES AND STUDED IN RELATION TO THEIR AGRESSIVITY AND FREQUENCY, WHETHER IT BE MAXIMUM RAINFALL (DAILY ANNUAL, DAILY AT THE BEGINNING OF THE RAINY SEASON OR RAINY PERIODS OF 2 TO 30 CONSECUTIVE DAYS), STRONG WINDS, THERMAL AMPLITUDE IN ROCK AND SOIL, OR VARIATIONS IN SOIL MOISTURE. THE PASSIVE FACTORS, THAT IS THE PLANT AND PEDOLOGICAL COVERS, INFLUENCED BY CLIMATE AND ESPECIALLY BY THE PRESENCE OF MAN ARE ILLUSTRATED IN THEIR SPATIO-TEMPORAL VARIABILITY, MAINLY AT THE EXPERIMENT SITES. DETAILED MAPS (1 10.000) HAVE BEEN DRAWN UP TO SHOW VEGETATION COVER, GEOSYSTEMS AND THE CONSTRAINTS OF THE IMIGA CATCHMENT. BOOK II DEALS WITH THE MEASUREMENTS, THE PROCESSES AND THE FORMS OF EROSION ON DIFFERENT SPATIAL SCALES. A SUMMARY OF THE MEASUREMENTS OF RUNOFF AND EROSION MADE ON THE EXPERIMENTAL PLOTS AT THE EIGHT STATIONS IS PRESENTED. THE RESULTS OBTAINED AT PO ARE EXAMINED IN DETAIL (WATER BALANCE, MULTIPLE LINEAR REGRESSION). THE HYDROLOGICAL OBSERVATIONS MADE OVER FOUR YEARS (1982-1985) AT IMIGA, ON SMALL CATCHMENTS, PROVIDE THE FIRST INFORMATION ON THE EROSION AT THIS SCALE. THE RESULTS ARE THEN COMPARED TO THE SILTING OF DAMS AND SOLID LOADS. THE IMPORTANCE OF GULLYING IS EMPHASIZED, AS IS THE NON-CONTINUOUS NATURE IN SPACE OF EROSION. THE STUDY CONCLUDES WITH AN ATTEMPT TO SUMMARISE THE FIGHT AGAINST EROSION AT BURKINA FASO OVER THE LAST 20 YEARS.
Keywords : Savanna
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  • HAL Id : hal-01166073, version 1

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Michel Mietton. Dynamique de l'interface lithosphère-atmosphère au Burkina Faso. L'érosion en zone de savane. Editec, 1988, 2-86878-040-7. ⟨hal-01166073⟩

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