Publications des scientifiques de l'IRD

Hinderer J., Pfeffer Julia, Boucher Marie, Nahmani S., De Linage C., Boy J. P., Genthon Pierre, Séguis Luc, Favreau Guillaume, Bock O., Descloitres Marc. (2012). Land water storage changes from ground and space geodesy : first results from the GHYRAF (Gravity and Hydrology in Africa) experiment. Pure and Applied Geophysics, 169 (8), 1391-1410. ISSN 0033-4553.

Titre du document
Land water storage changes from ground and space geodesy : first results from the GHYRAF (Gravity and Hydrology in Africa) experiment
Année de publication
2012
Type de document
Article référencé dans le Web of Science WOS:000306547200006
Auteurs
Hinderer J., Pfeffer Julia, Boucher Marie, Nahmani S., De Linage C., Boy J. P., Genthon Pierre, Séguis Luc, Favreau Guillaume, Bock O., Descloitres Marc
Source
Pure and Applied Geophysics, 2012, 169 (8), 1391-1410 ISSN 0033-4553
This paper is devoted to the first results from the GHYRAF (Gravity and Hydrology in Africa) experiment conducted since 2008 in West Africa and is aimed at investigating the changes in water storage in different regions sampling a strong rainfall gradient from the Sahara to the monsoon zone. The analysis of GPS vertical displacement in Niamey (Niger) and Djougou (Benin) shows that there is a clear annual signature of the hydrological load in agreement with global hydrology models like GLDAS. The comparison of GRACE solutions in West Africa, and more specifically in the Niger and Lake Chad basins, reveals a good agreement for the large scale annual water storage changes between global hydrology models and space gravity observations. Ground gravity observations done with an FG5 absolute gravimeter also show signals which can be well related to measured changes in soil and ground water. We present the first results for two sites in the Sahelian band (Wankama and Diffa in Niger) and one (Djougou in Benin) in the Sudanian monsoon region related to the recharge-discharge processes due to the monsoonal event in summer 2008 and the following dry season. It is confirmed that ground gravimetry is a useful tool to constrain local water storage changes when associated to hydrological and subsurface geophysical in situ measurements.
Plan de classement
Hydrologie [062]
Localisation
Fonds IRD [F B010057107]
Identifiant IRD
fdi:010057107
Contact