Search Results - "Favreau, G."

Land clearing, climate variability, and water resources increase in semiarid southwest Niger: A review by Favreau, G, Cappelaere, B, Massuel, S, Leblanc, M, Boucher, M, Boulain, N, Leduc, C

“…The water table in southwestern Niger has been rising continuously for the past decades (4 m rise from 1963 to 2007), despite a approximately 23% deficit in…”
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Spatio-temporal variability of hydrological regimes around the boundaries between Sahelian and Sudanian areas of West Africa: A synthesis by Descroix, L., Mahé, G., Lebel, T., Favreau, G., Galle, S., Gautier, E., Olivry, J-C., Albergel, J., Amogu, O., Cappelaere, B., Dessouassi, R., Diedhiou, A., Le Breton, E., Mamadou, I., Sighomnou, D.

“…Abundant information is available on West African drought and its hydrological and environmental impacts. Land-use and climatic changes have greatly modified…”
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Determining natural groundwater influx to a tropical river using radon, chlorofluorocarbons and ionic environmental tracers by Cook, P.G., Favreau, G., Dighton, J.C., Tickell, S.

“…Measurements of 222Rn, CFC-11, CFC-12, major ions and temperature of river water and springs are used to quantify rates of groundwater inflow to a tropical…”
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Long-term rise in a Sahelian water-table: the Continental Terminal in South-West Niger by Leduc, C, Favreau, G, Schroeter, P

“…The Continental Terminal water-table near Niamey (S-W Niger) has been the subject of a dense and detailed survey conducted over a period of almost 15 yr. The…”
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Building a field- and model-based climatology of local water and energy cycles in the cultivated Sahel – annual budgets and seasonality by Velluet, C, Demarty, J, Cappelaere, B, Braud, I, Issoufou, H. B.-A, Boulain, N, Ramier, D, Mainassara, I, Charvet, G, Boucher, M, Chazarin, J.-P, Oï, M, Yahou, H, Maidaji, B, Arpin-Pont, F, Benarrosh, N, Mahamane, A, Nazoumou, Y, Favreau, G, Seghieri, J

“…In the sub-Saharan Sahel, energy and water cycling at the land surface is pivotal for the regional climate, water resources and land productivity, yet it is…”
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The AMMA-CATCH experiment in the cultivated Sahelian area of south-west Niger – Investigating water cycle response to a fluctuating climate and changing environment by Cappelaere, B., Descroix, L., Lebel, T., Boulain, N., Ramier, D., Laurent, J.-P., Favreau, G., Boubkraoui, S., Boucher, M., Bouzou Moussa, I., Chaffard, V., Hiernaux, P., Issoufou, H.B.A., Le Breton, E., Mamadou, I., Nazoumou, Y., Oi, M., Ottlé, C., Quantin, G.

“…Among the three sites distributed along the West African latitudinal gradient in the AMMA-CATCH observation system, the experimental setup in the Niamey area…”
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Estimating specific yield and transmissivity with magnetic resonance sounding in an unconfined sandstone aquifer (Niger) by Boucher, M, Favreau, G, Vouillamoz, J. M, Nazoumou, Y, Legchenko, A

“…The unconfined aquifer of the Continental Terminal in Niger was investigated by magnetic resonance sounding (MRS) and by 14 pumping tests in order to improve…”
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Integrated surface water–groundwater modelling in the context of increasing water reserves of a regional Sahelian aquifer by Massuel, S, Cappelaere, B, Favreau, G, Leduc, C, Lebel, T, Vischel, T

“…Despite the Sahelian drought of the 1970s–1990s, the unconfined aquifer in southwest Niger exhibits a multidecadal increase in groundwater reserves. Recent…”
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Water balance and vegetation change in the Sahel: A case study at the watershed scale with an eco-hydrological model by Boulain, N., Cappelaere, B., Séguis, L., Favreau, G., Gignoux, J.

“…The Sahel, a semiarid area set in a fragile context, has been undergoing dramatic climate and land-use changes since the middle of the 20th century. The…”
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Origins of streamflow in a crystalline basement catchment in a sub-humid Sudanian zone: The Donga basin (Benin, West Africa) Inter-annual variability of water budget by Séguis, L, Kamagaté, B, Favreau, G, Descloitres, M, Seidel, J.-L, Galle, S, Peugeot, C, Gosset, M, Le Barbé, L, Malinur, F, Van Exter, S, Arjounin, M, Boubkraoui, S, Wubda, M

“…During the last quarter of the 20th century, West Africa underwent a particularly intense and generalized drought. During this period, the biggest drops in…”
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Investigation of groundwater resources in the Komadugu Yobe Valley (Lake Chad Basin, Niger) using MRS and TDEM methods by Descloitres, M., Chalikakis, K., Legchenko, A., Moussa, A.M., Genthon, P., Favreau, G., Le Coz, M., Boucher, M., Oï, M.

“…•We investigated the Quaternary Komadugu Yobe aquifer in the Lake Chad Basin.•We used the Magnetic Resonance Sounding (MRS) method with time-domain EM.•We…”
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Water-balance approach for assessing potential for smallholder groundwater irrigation in Sub-Saharan Africa by Villholth, K.G., Favreau, G., Pavelic, P., Smakhtin, V.

“…Strategies for increasing the development and use of groundwater for agriculture over much of Sub-Saharan Africa (SSA) are urgently needed. Expansion of…”
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Land Water Storage Changes from Ground and Space Geodesy: First Results from the GHYRAF (Gravity and Hydrology in Africa) Experiment by Hinderer, J., Pfeffer, J., Boucher, M., Nahmani, S., De Linage, C., Boy, J.-P., Genthon, P., Seguis, L., Favreau, G., Bock, O., Descloitres, M.

“…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…”
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Simulated impacts of climate change and land-clearing on runoff from a small Sahelian catchment by Séguis, L., Cappelaere, B., Milési, G., Peugeot, C., Massuel, S., Favreau, G.

“…In the Sahel, there are few long‐term data series available to estimate the climatic and anthropogenic impacts on runoff in small catchments. Since 1950, land…”
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Contribution of magnetic resonance sounding to aquifer characterization and recharge estimate in semiarid Niger by Vouillamoz, J.M., Favreau, G., Massuel, S., Boucher, M., Nazoumou, Y., Legchenko, A.

“…To improve the knowledge of the regionally important Continental Terminal 3 (CT3) aquifer in south-western Niger, fifteen magnetic resonance soundings (MRS)…”
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Renewal rate estimation of groundwater based on radioactive tracers ( 3H, 14C) in an unconfined aquifer in a semi-arid area, Iullemeden Basin, Niger by Le Gal La Salle, C., Marlin, C., Leduc, C., Taupin, J.D., Massault, M., Favreau, G.

“…Estimation of groundwater recharge in arid and semi-arid areas is difficult due to the low amount and variability of recharge. A combination of radiotracers…”
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Impacts of Hydrological Changes in the Mediterranean Zone: Environmental Modifications and Rural Development in the Merguellil Catchment, Central Tunisia by Leduc, C, Ammar, SBen, Favreau, G, Beji, R, Virrion, R, Lacombe, G, Tarhouni, J

“…Environmental modifications and rural development in the Merguellil catchment of central Tunisia are examined. The Merguellil catchment is apparently rich in…”
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Origins of streamflow in a crystalline basement catchment in a sub-humid Sudanian zone: The Donga basin (Benin, West Africa) by Séguis, L., Kamagaté, B., Favreau, G., Descloitres, M., Seidel, J.-L., Galle, S., Peugeot, C., Gosset, M., Le Barbé, L., Malinur, F., Van Exter, S., Arjounin, M., Boubkraoui, S., Wubda, M.

“…► We examine the water redistribution on three basement catchments in sub-humid Benin. ► The permanent groundwater in the weathered cover does not drain to…”
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The GHYRAF (Gravity and Hydrology in Africa) experiment: Description and first results by Hinderer, J., de Linage, C., Boy, J.-P., Gegout, P., Masson, F., Rogister, Y., Amalvict, M., Pfeffer, J., Littel, F., Luck, B., Bayer, R., Champollion, C., Collard, P., Le Moigne, N., Diament, M., Deroussi, S., de Viron, O., Biancale, R., Lemoine, J.-M., Bonvalot, S., Gabalda, G., Bock, O., Genthon, P., Boucher, M., Favreau, G., Séguis, L., Delclaux, F., Cappelaere, B., Oi, M., Descloitres, M., Galle, S., Laurent, J.-P., Legchenko, A., Bouin, M.-N.

“…This paper is the first presentation of a project called GHYRAF (Gravity and Hydrology in Africa) devoted to the detailed comparison between models and…”
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Comment on “Estimating groundwater mixing ratios and their uncertainties using a statistical multi parameter approach” by Rueedi, J., Purtschert, R., Beyerle, U., Alberich, C., Kipfer, R. J. Hydrol., 2005, 305: 1–14 by Leduc, C., Favreau, G., Guero, A., Daddy Gaoh, A.

“…The paper of Rueedi et al. (2005) proposes a statistical approach for a multi-layered system in order to determine intrinsic characteristics of each aquifer…”
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