Understanding the way water storage space-time distribution controls and/or responds to water fluxes (precipitation, evapotranspiration, streamflow...) is a fundamental step to reveal critical zone processes, that is, the way each compartment in the critical zone is linked with the others.


Streamflow generation in Sudanian West-Africa

By combining a whole range of different hydro (precipitation, streamflow, water table depths, soil moisture), geophysical (ERT, EM38) and hybrid gravity measurements, we could reveal streamflow (here mostly baseflow) generation processes at a headwater catchment scale in Sudanian West-Africa (Northern Benin) from observation of the internal catchment dynamics (i.e. spatial distribution of water storage changes).


Hector, B., Séguis, L., Hinderer, J., Cohard, J.-M., Wubda, M., Descloitres, M., Benarrosh, N. and Boy, J.-P.: Water storage changes as a marker for base flow generation processes in a tropical humid basement catchment (Benin): Insights from hybrid gravimetry, Water Resour. Res., n/a-n/a, doi:10.1002/2014WR015773, 2015.


Evapotranspiration of different land covers in West-Africa:

Comparing temporal dynamics and amplitudes of evapotranspiration fluxes from Savannah and forested land cover in Sudanian area, as measured by Eddy-correlation from flux-tower data brings significant insights into how would the large land-use change impact water storage and the water cycle (fluxes). In many parts of West-Africa, anthropic pressure (past, present, and expected in the future due to the strong demographic rates) increases replacement wood cover by savannah and plots.


Mamadou, O., Galle, S., Cohard, J.-M., Peugeot, C., Kounouhewa, B., Biron, R., Hector, B. and Zannou, A. B.: Dynamics of water vapor and energy exchanges above two contrasting Sudanian climate ecosystems in Northern Benin (West Africa), J. Geophys. Res. Atmos., 2016JD024749, doi:10.1002/2016JD024749, 2016.


The hydrological role of inland valleys in Sudanian West-Africa

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Groundwater recharge below sahelian rivers

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Genthon, P., Hector, B., Luxereau, A., Descloitres, M., Abdou, H., Hinderer, J. and Bakalowicz, M.: Groundwater recharge by Sahelian rivers—consequences for agricultural development: example from the lower Komadugu Yobe River (Eastern Niger, Lake Chad Basin), Environ Earth Sci, 1–12, doi:10.1007/s12665-015-4119-y, 2015.