Hydrologcal Processes for Vulnerables Water Resources



**Context :

With regard to future demographic and climatic changes, the rational management of water resources (aquifers, surface waters) is one of the major challenges of the next century, especially in environments where they are rare or difficult to exploit. These resources are located in the Critical Zone. They are particularly vulnerable when they are subjected to high anthropogenic pressures (irrigation, pollution, land-use change etc.), and/or climatic pressures (insufficient or decreasing recharge, modification of rainfall extremes, increased evapotranspiration, change in infiltration and superficial moisture). The spatio-temporal dynamics of these resources are conditioned by the spatial distribution of precipitation, but also by the spatial redistribution of water, whether natural (river, underground transfer) or anthropogenic (pumping for adduction or irrigation ). These transfers, the continental part of the water cycle, also affect hydrological hazard and interactions with the atmosphere.

In this context The PHyREV team is interested more specifically in complex environments where hydrological responses are the result of the interdependence of many hydrological , but also eco-physiological and micro-meteorological processes. The studied scales ranges from a few hectares, to a few km² or cover regional scales such as the Sahel or the entire West Africa.

Scientific questions :

The scientific questions of the PHyREV team concern on the one hand scaling issues in hydrology and on the other hand the interactions between the surface processes and the recharge of the aquifers :

• How can we bring responses for the future of water resources (aquifers, surface water) at a regional scale based on knowledge of the physical processes identified at the lower scales (plot, slope, elementary catchment) ?

• What are the interactions between surface processes and recharge of aquifers and to what extent is it necessary to take these interactions into account in order to predict the availability of water resources and hydrological hazards ?