Evaluation of recent hydro-climatic changes in four tributaries of the Niger River Basin (West Africa)

Badou, Djigbo Félicien; Kapangaziwiri, Evison; Diekkrüger, Bernd; Hounkpè, Jean; Afouda, Abel

doi:10.1080/02626667.2016.1250898

Cited by 27 publications

(25 citation statements)

References 61 publications

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“…The economy of this region is mainly based on rainfed agriculture, and any change in the climate regime would directly affect the income at the country level as well as the livelihood of local populations (Läderach, Martinez‐Valle, Schroth, & Castro, ; Schroth, Läderach, Martinez‐Valle, Bunn, & Jassogne, ; Sultan & Gaetani, ). The high sensitivity of the West African region to climate hazards is illustrated by the severe consequences of the drought of the 1970s and 1980s (Amogu et al, ; Badou, Kapangaziwiri, Diekkrüger, Hounkpè, & Afouda, ; Lebel et al, ) and the floods at the end of the 2000s and the beginning of the 2010s (Aich et al, ; Descroix et al, ) on agricultural production and livelihoods of local population (Bonou, ; Hounkpè, Diekkrüger, Badou, & Afouda, ; Liersch et al, ).…”

Section: Introductionmentioning

confidence: 99%

Modelling blue and green water availability under climate change in the Beninese Basin of the Niger River Basin, West Africa

Badou

Diekkrüger

Kapangaziwiri

et al. 2018

Hydrological Processes

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The aim of this study was to quantify climate change impact on future blue water (BW) and green water (GW) resources as well as the associated uncertainties for 4 subbasins of the Beninese part of the Niger River Basin. The outputs of 3 regional climate models (HIRHAM5, RCSM, and RCA4) under 2 emission scenarios (RCP4.5 and RCP8.5) were downscaled for the historical period (1976–2005) and for the future (2021–2050) using the Statistical DownScaling Model (SDSM). Comparison of climate variables between these 2 periods suggests that rainfall will increase (1.7% to 23.4%) for HIRHAM5 and RCSM under both RCPs but shows mixed trends (−8.5% to 17.3%) for RCA4. Mean temperature will also increase up to 0.48 °C for HIRHAM5 and RCSM but decrease for RCA4 up to −0.37 °C. Driven by the downscaled climate data, future BW and GW were evaluated with hydrological models validated with streamflow and soil moisture, respectively. The results indicate that GW will increase in all the 4 investigated subbasins, whereas BW will only increase in one subbasin. The overall uncertainty associated with the evaluation of the future BW and GW was quantified through the computation of the interquartile range of the total number of model realizations (combinations of regional climate models and selected hydrological models) for each subbasin. The results show larger uncertainty for the quantification of BW than GW. To cope with the projected decrease in BW that could adversely impact the livelihoods and food security of the local population, recommendations for the development of adequate adaptation strategies are briefly discussed.

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Section: Introductionmentioning

confidence: 99%

Modelling blue and green water availability under climate change in the Beninese Basin of the Niger River Basin, West Africa

Badou

Diekkrüger

Kapangaziwiri

et al. 2018

Hydrological Processes

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“…For some Sudanian tributaries of the Niger River, Badou et al [59] determined that significant lower runoff was observed around 1979, followed by a regime shift to wetter conditions around 1992. In smaller basins, Nka et al [3] identified only one case of a decreasing trend in flood magnitude in the long time series.…”

Section: Some Sudanian Riversmentioning

confidence: 99%

“…It includes basins for which data are available in the literature. Eleven are described by Nka et al [3], four by Opoku-Ankomah et al [25], two by Amoussou et al [27], one by Soro et al [28], two by Amogu et al [67], three by Badou et al [59], one by Genthon (personal communication, 2017), and three by Mahé et al [26] and Mahé and Paturel [9]. Figure 6 gathers the few hydrological series with available data for the period preceding the humid 1950-1967 period.…”

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confidence: 99%

Evolution of Surface Hydrology in the Sahelo-Sudanian Strip: An Updated Review

Descroix

Guichard

Grippa

et al. 2018

Water

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Abstract:In the West African Sahel, two paradoxical hydrological behaviors have occurred during the last five decades. The first paradox was observed during the 1968-1990s 'Great Drought' period, during which runoff significantly increased. The second paradox appeared during the subsequent period of rainfall recovery (i.e., since the 1990s), during which the runoff coefficient continued to increase despite the general re-greening of the Sahel. This paper reviews and synthesizes the literature on the drivers of these paradoxical behaviors, focusing on recent works in the West African Sahelo/Sudanian strip, and upscaling the hydrological processes through an analysis of recent data from two representative areas of this region. This paper helps better determine the respective roles played by Land Use/Land Cover Changes (LULCC), the evolution of rainfall intensity and the occurrence of extreme rainfall events in these hydrological paradoxes. Both the literature review and recent data converge in indicating that the first Sahelian hydrological paradox was mostly driven by LULCC, while the second paradox has been caused by both LULCC and climate evolution, mainly the recent increase in rainfall intensity.

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“…The study of Aich et al [7] emphasized the danger of increasing catastrophic floods in some catchments of the Niger River Basin. This will aggravate the challenges of reported floods on rural farmers at the peak of the rainy season in the Niger Basin parts of Benin [8].The evidence of current and future flooding reported in the Niger Basin in Benin [7][8][9] readdresses the need for the development of sustainable coping strategies for changing hydrological trends.…”

Section: Introductionmentioning

confidence: 99%

“…The Benin portion of the Basin (Figure 1) is generally considered to be one of the sub basins of the Niger that is most affected by freshwater variability [9]. Precipitation is very variable spatially and temporarily in the basin.…”

Section: Study Areamentioning

confidence: 99%

Farmers’ Responses to Changing Hydrological Trends in the Niger Basin Parts of Benin

2017

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Sub-Saharan Africa is highly vulnerable to climate change given its low capacities of resilience to the enormous challenges climate change will pose. Research aimed at evaluating changes in hydrological trends and methods of adaptation was conducted in the Niger Basin parts of Benin at the peak of the rainy season in the year 2012. Rainfall and river discharge were analyzed from 1950-2010 in order to generate patterns of changes in the region. Structured questionnaires were used to evaluate the perceptions of 14 farming communities on climate-related issues and their methods of adaptations. Mann-Kendall and Pettit trend analyses were conducted for rainfall and river discharge. The findings indicated that significant decreases characterized rainfall and river discharge in the period of study. Flash flood was considered the major challenge faced in the region according to more than 90% of crop, animal, and fish farmers. Aside from that, decrease in water availability was identified as an additional challenge. Irrigation, diversification, water treatment, drainage, small dams, and dikes were reported as the common adaptation mechanisms in the catchments. This study will help in designing sustainable adaptation mechanisms to abrupt changes in the hydrology of the region.

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Evaluation of recent hydro-climatic changes in four tributaries of the Niger River Basin (West Africa)

Cited by 27 publications

References 61 publications

Modelling blue and green water availability under climate change in the Beninese Basin of the Niger River Basin, West Africa

Modelling blue and green water availability under climate change in the Beninese Basin of the Niger River Basin, West Africa

Evolution of Surface Hydrology in the Sahelo-Sudanian Strip: An Updated Review

Farmers’ Responses to Changing Hydrological Trends in the Niger Basin Parts of Benin

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