A. Aziz, O. I. Burn, and D. H. , Trends and variability in the hydrological regime of the Mackenzie River Basin, Journal of Hydrology, vol.319, issue.1-4, pp.282-294, 2006.
DOI : 10.1016/j.jhydrol.2005.06.039

V. Aich, B. Koné, F. F. Hattermann, and E. N. Müller, Floods in the Niger basin – analysis and attribution, Natural Hazards and Earth System Sciences Discussions, vol.2, issue.8, pp.5171-521210, 2014.
DOI : 10.5194/nhessd-2-5171-2014-supplement

J. Albergel, Sécheresse, désertification et ressources en eau de surface ? Application aux petits bassins du Burkina Faso, in: The Influence of Climate Change and Climatic Variability on the Hydrologic Regime and Water Resources, Proceedings of the Vancouver Symposium, pp.355-365, 1987.

A. Amani and M. Nguetora, Evidence d'une modification du regime hydrologique du fleuve Niger a Niamey, in: FRIEND 2002 ? Regional Hydrology: Briging the Gap between Research and Practice, Porceedings of the fourth International FRIEND Conference held at Cape Town, pp.449-457, 2002.

O. Amogu, L. Descroix, K. S. Yéro, L. Breton, E. Mamadou et al., Increasing River Flows in the Sahel?, Water, vol.2, issue.2, pp.170-199, 2010.
DOI : 10.3390/w2020170

URL : https://hal.archives-ouvertes.fr/insu-00564366

A. Anyamba and C. J. Tucker, Analysis of Sahelian vegetation dynamics using NOAA-AVHRR NDVI data from 1981???2003, Journal of Arid Environments, vol.63, issue.3, pp.596-614, 1981.
DOI : 10.1016/j.jaridenv.2005.03.007

D. H. Burn, J. M. Cunderlik, and A. Pietroniro, Hydrological trends and variability in the Liard River basin / Tendances hydrologiques et variabilit?? dans le basin de la rivi??re Liard, Hydrological Sciences Journal, vol.13, issue.1, pp.53-67, 2004.
DOI : 10.1175/1520-0442(1997)010<1004:ELIV>2.0.CO;2

H. Cramer, Mathematical Methods of Statistics, 1946.

A. Dai, P. J. Lamb, K. E. Trenberth, M. Hulme, P. D. Jones et al., The recent Sahel drought is real, International Journal of Climatology, vol.24, issue.11, pp.1323-1331, 2004.
DOI : 10.1002/joc.1083

C. Dardel, L. Kergoat, P. Hiernaux, M. Grippa, E. Mougin et al., Rain-Use-Efficiency: What it Tells us about the Conflicting Sahel Greening and Sahelian Paradox, Remote Sensing, vol.6, issue.4, pp.3446-3474, 2014.
DOI : 10.3390/rs6043446

L. Descroix, G. Mahé, T. Lebel, G. Favreau, S. Galle et al., Spatio-temporal variability of hydrological regimes around the boundaries between Sahelian and Sudanian areas of West Africa: A synthesis, Journal of Hydrology, vol.375, issue.1-2, pp.90-102, 2009.
DOI : 10.1016/j.jhydrol.2008.12.012

URL : https://hal.archives-ouvertes.fr/insu-00412012

L. Descroix, P. Genthon, O. Amogu, J. Rajot, D. Sighomnou et al., Change in Sahelian Rivers hydrograph: The case of recent red floods of the Niger River in the Niamey region, Global and Planetary Change, vol.98, issue.99, pp.98-99, 2012.
DOI : 10.1016/j.gloplacha.2012.07.009

L. Descroix, D. Niang, H. Dacosta, G. Panthou, G. Quantin et al., Évolution des pluies de cumul élevé et recrudescence des crues depuis, pp.37-49, 1951.

D. Baldassarre, G. Montanari, A. Lins, H. Koutsoyiannis, D. Brandimarte et al., Flood fatalities in Africa: From diagnosis to mitigation, Geophysical Research Letters, vol.1, issue.1, pp.10-1029, 2010.
DOI : 10.1029/2010GL045467

R. Fensholt, K. Rasmussen, P. Kaspersen, S. Huber, S. Horion et al., Assessing land degradation/recovery in the African Sahel from long-term Earth observation based primary productivity and precipitation relationships, Remote Sens, pp.664-68610, 2013.

K. H. Hamed, Trend detection in hydrologic data: The Mann???Kendall trend test under the scaling hypothesis, Journal of Hydrology, vol.349, issue.3-4, pp.350-363, 2008.
DOI : 10.1016/j.jhydrol.2007.11.009

S. M. Herrmann, A. Anyamba, T. , and C. J. , Recent trends in vegetation dynamics in the African Sahel and their relationship to climate, Global Environmental Change, vol.15, issue.4, pp.394-404, 2005.
DOI : 10.1016/j.gloenvcha.2005.08.004

V. E. Johnson, A Bayesian ?? 2 test for goodness-of-fit, The Annals of Statistics, vol.32, issue.6, pp.2361-2384, 2004.
DOI : 10.1214/009053604000000616

M. G. Kendall, A. M. Klein-tank, F. W. Zwiers, and X. Zhang, Rank Correlation Methods Guidelines on Analysis of extremes in a changing climate in support of informed decisions for adaptation, Climate Data and Monitoring, 1975.

Z. W. Kundzewicz, D. Graczyk, T. Maurer, I. Pi´nskwarpi´nskwar, M. Radziejewski et al., Trend detection in river flow series: 1. Annual maximum flow / D??tection de tendance dans des s??ries de d??bit fluvial: 1. D??bit maximum annuel, Hydrological Sciences Journal, vol.45, issue.4, pp.797-810, 2005.
DOI : 10.1623/hysj.48.1.51.43478

M. Lang, T. B. Ouarda, and B. Bobée, Towards operational guidelines for over-threshold modeling, Journal of Hydrology, vol.225, issue.3-4, pp.103-11710, 1999.
DOI : 10.1016/S0022-1694(99)00167-5

L. Barbé, L. Lebel, T. Tapsoba, and D. , Rainfall variability in West Africa during the years 1950?90, J. Climate, vol.152, pp.187-202, 2002.

T. Lebel and A. Ali, Recent trends in the Central and Western Sahel rainfall regime (1990???2007), Journal of Hydrology, vol.375, issue.1-2, pp.52-64, 1990.
DOI : 10.1016/j.jhydrol.2008.11.030

URL : https://hal.archives-ouvertes.fr/insu-00412630

T. Lebel, B. Cappelaere, S. Galle, N. Hanan, L. Kergoat et al., AMMA-CATCH studies in the Sahelian region of West-Africa: An overview, Journal of Hydrology, vol.375, issue.1-2, pp.3-13, 2009.
DOI : 10.1016/j.jhydrol.2009.03.020

URL : https://hal.archives-ouvertes.fr/ird-00392544

L. 'hôte, Y. Mahé, G. Somé, B. Triboulet, and J. P. , Analysis of a Sahelian annual rainfall index from 1896 to 2000; the drought continues, Hydrological Sciences Journal, vol.325, issue.4, pp.563-572, 2002.
DOI : 10.2307/2346729

M. Ly, S. B. Traore, A. Agali, and B. Sarr, Evolution of some observed climate extremes in the West African Sahel, Weather and Climate Extremes, pp.19-25, 2013.

G. Mahé, Surface/groundwater interactions in the Bani and Nakambe rivers, tributaries of the Niger and Volta basins, West Africa, Hydrological Sciences Journal, vol.325, issue.4, pp.704-712, 2009.
DOI : 10.1002/ldr.842

G. Mahé and J. Olivry, Variations des précipitations et des écoulements en Afrique de l'Ouest et centrale de, Science et changements planétaires/Sécheresse, vol.6, pp.109-117, 1951.

G. Mahé and J. Paturel, Sahelian annual rainfall variability and runoff increase of Sahelian Rivers, C. R. Geosci, vol.341, pp.1896-2006, 2009.

G. Mahé, G. Lienou, L. Descroix, F. Bamba, J. E. Paturel et al., The rivers of Africa: witness of climate change and human impact on the environment, Hydrological Processes, vol.80, issue.20, pp.2105-2114, 2013.
DOI : 10.1002/hyp.9813

H. B. Mann, Nonparametric Tests Against Trend, Econometrica, vol.13, issue.3, pp.245-25910, 1945.
DOI : 10.2307/1907187

M. New, B. Hewitson, D. B. Stephenson, A. Tsiga, A. Kruger et al., Evidence of trends in daily climate extremes over southern and west Africa, Journal of Geophysical Research, vol.16, issue.23, pp.1410210-1029, 2006.
DOI : 10.1029/2005JD006289

S. Nicholson, Climatic and environmental change in Africa during the last two centuries, Climate Research, vol.17, pp.123-144, 2001.
DOI : 10.3354/cr017123

S. Nicholson, On the question of the ???recovery??? of the rains in the West African Sahel, Journal of Arid Environments, vol.63, issue.3, pp.615-641, 2005.
DOI : 10.1016/j.jaridenv.2005.03.004

P. Ozer, M. Erpicum, G. Demarée, and M. Vandiepenbeeck, The Sahelian drought may have ended during the 1990s, Hydrological Sciences Journal, vol.42, issue.3, pp.489-492, 2002.
DOI : 10.1002/(SICI)1097-0088(199809)18:11<1261::AID-JOC302>3.0.CO;2-Z

G. Panthou, Analyse des extrêmes pluviométriques en Afrique de l'Ouest, 2013.

G. Panthou, T. Vischel, T. Lebel, J. Blanchet, G. Quantin et al., Extreme rainfall in West Africa: A regional modeling, Water Resources Research, vol.20, issue.4, p.10, 1029.
DOI : 10.1029/2012WR012052

G. Panthou, T. Vischel, and T. Lebel, Recent trends in the regime of extreme rainfall in the Central Sahel, International Journal of Climatology, vol.24, issue.2, pp.3998-4006, 2014.
DOI : 10.1002/joc.3984

J. E. Paturel, E. Servat, M. O. Delattre, and H. Lubès-niel, Analyse de s??ries pluviom??triques de longue dur??e en Afrique de l'Ouest et Centrale non sah??lienne dans un contexte de variabilit?? climatique, Hydrological Sciences Journal, vol.290, issue.6, pp.937-946, 1998.
DOI : 10.1016/S0022-1694(96)03068-5

J. E. Paturel, M. Ouedraogo, E. Servat, G. Mahe, A. Dezetter et al., The concept of rainfall and streamflow normals in West and Central Africa in a context of climatic variability, Hydrological Sciences Journal, vol.325, issue.1, pp.125-137, 2003.
DOI : 10.1175/1520-0450(1985)024<0097:STCRRA>2.0.CO;2

T. C. Peterson, M. A. Taylor, R. Demeritte, D. L. Duncombe, S. Burton et al., Recent changes in climate extremes in the Caribbean region, Journal of Geophysical Research: Atmospheres, vol.107, issue.D9, p.460110, 1029.
DOI : 10.1029/2002JD002251

A. N. Pettitt, A non-parametric approach to the changepoint problem, J. Roy. Stat. Soc. Ser. C-App, vol.28, pp.126-13510, 1979.

A. J. Robson, T. K. Jones, D. W. Reed, and A. C. Bayliss, A study of national trend and variation in UK floods, International Journal of Climatology, vol.16, issue.2, pp.165-182, 1998.
DOI : 10.1002/(SICI)1097-0088(199802)18:2<165::AID-JOC230>3.0.CO;2-#

P. Roudier, A. Ducharne, and L. Feyen, Climate change impacts on runoff in West Africa: a review, Hydrology and Earth System Sciences, vol.18, issue.7, pp.2789-2801, 2014.
DOI : 10.5194/hess-18-2789-2014

URL : https://hal.archives-ouvertes.fr/hal-01058894

M. A. Sarr, M. Zoromé, O. Seidou, C. R. Bryant, and P. Gachon, Recent trends in selected extreme precipitation indices in Senegal ??? A changepoint approach, Journal of Hydrology, vol.505, pp.326-334, 2013.
DOI : 10.1016/j.jhydrol.2013.09.032

J. T. Schaefer, The critical success index as an indicator of warning skill, Weather Forecast, pp.570-575, 1990.

C. Svensson, W. Z. Kundzewicz, and T. Maurer, Trend detection in river flow series: 2. Flood and low-flow index series / D??tection de tendance dans des s??ries de d??bit fluvial: 2. S??ries d'indices de crue et d'??tiage, Hydrological Sciences Journal, vol.26, issue.5, pp.811-824, 2005.
DOI : 10.1023/A:1005319109110

A. Tarhule, Damaging Rainfall and Flooding: The Other Sahel Hazards, Climatic Change, vol.10, issue.D8, pp.355-37710, 2005.
DOI : 10.1007/s10584-005-6792-4

P. Tschakert, R. Sagoe, G. Ofori-darko, C. , and S. N. , Floods in the Sahel: an analysis of anomalies, memory, and anticipatory learning, Climatic Change, vol.33, issue.13, pp.471-502, 2010.
DOI : 10.1007/s10584-009-9776-y

L. A. Vincent, T. C. Peterson, V. R. Barros, M. B. Marino, M. Rusticucci et al., Observed Trends in Indices of Daily Temperature Extremes in South America 1960???2000, Journal of Climate, vol.18, issue.23, pp.5011-502310, 1175.
DOI : 10.1175/JCLI3589.1