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The use of ground water in the Sudano-Sahelian zone of West Africa is often not optimal because of the difficulty of estimating the time during which pumping can be carried out and the usable flow. Solving this problem would require an evaluation of the water recharge. The methods actually used to estimate this recharge, on a seasonal and interannual basis, do not allow monitoring of the water resources at the regional level. It is in this context that BRGM and JRC have set up a research collaboration to evaluate the possibilities offered by NOAA-AVHRR time series in a hydrogeological perspective; 11 watersheds have been selected for the study, in different ecological domains of Burkina Faso. Processing and analysis of NOAA-AVHRR-GAC time series for 1984-85-86 have given indicators of the vegetation cover status on each watershed. Interpretation of the temporal dynamics, seasonal and interannual, of the state of the surface was used to differentiate the watersheds and to derive some behaviour rules. These rules could, if combined with rainfall data, help in quantifying the annual capabilities of recharge of the water table. The next step of the research will be a combined analysis of available hydrologic data, collected on the ground, and surface dynamics, as derived from NOAA-AVHRR time series, in order to control the validity of the results obtained during this first phase of the study.

Additional information

Authors: GRÉGOIRE J M, JRC Ispra (IT);CHIESA L, JRC Ispra (IT);KING C, Bureau de Recherches Géologiques et Minières, Département Télédétection, Orléans (FR)
Bibliographic Reference: EUR 14172 FR (1991) 39 pp., FS, free of charge
Availability: Available from Joint Research Centre, Public Relations Office, I-21020 Ispra (Va.) (IT)
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