Impacts of climate and environmental changes on water resources: A multi-scale study based on Nakanbé nested watersheds in West African Sahel

Gbohoui, Yetchékpo Patrick; Paturel, Jean‐Emmanuel; Fowé, Tazen; Mounirou, Lawani Adjadi; Yonaba, Roland; Karambiri, Harouna; Yacouba, Hamma

doi:10.1016/j.ejrh.2021.100828

Cited by 34 publications

(45 citation statements)

References 79 publications

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“…(10) (11) Where A represents the abatement coefficient, P an expresses the average annual rainfall (mm), S corresponds to the surface area of the watershed (km 2 ), P m10 : average ten-year rainfall (mm) and P 10 represents the ten-year rainfall (mm).…”

Section: Methodsmentioning

confidence: 99%

“…The maximum daily flows increase by almost 100%, but the number of days when the flow is higher than half the maximum flow varies a little over the same period, reflecting a flood that is not very spread out over time. Thus Climate change affecting most countries in the world in general and developing countries, in particular, today requires a better understanding of the hydrological behavior of watersheds to implement effective measures to regulate surface runoff, or less, to build resilience ( Gbohoui et al [11]. In West Africa, a change in climatic conditions since the 1970s has resulted in a decrease in average annual rainfall and an increase in temperature [12].…”

Section: Introductionmentioning

confidence: 99%

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Hydrological Investigation and Characterization of Sokouraba Watershed, Burkina Faso

Harouna

Daou²,

Hassan³

et al. 2022

CJAST

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The purpose of this study is to determine the hydrological characteristics and the morphometric parameters of the Sokouraba watershed (BV) where the climatic hazards make the water resource increasingly insufficient. This watershed has never been the subject of morphometric and hydrological characterization in the past. The present study made it possible thus, to better understand the functioning of the hydrographic networks as well as the quantity of water likely to be used for the construction of a dam in this watershed. According to the hydrologic analysis results, from 1960 to 2019, the annual precipitation values range from 347,3 to 1596,6 mm with an average of 1099,28 mm. The maximum daily rainfall values for the same period vary between 42 and 287 mm with an average of 82.85 mm. The values of wet decennial and wet quinquennial rainfall are respectively 1380 and 1280 mm. The dry five-year and dry ten-year rainfall values are 917 mm and 821 mm respectively. According to the watershed characterization results, the calculated Sokouraba watershed surface is 77,34 Km² and its perimeter is 44,3 Km. The values of the length and the width of the equivalent rectangle of the basin are respectively 17,81 Km and 4,34 Km. The longitudinal slope and the overall slope index values are 3.24 m/km and 3.20 m/Km respectively. The value of the corrected overall slope index of the watershed is 7.05 m/Km while the Gravelius compactness index is 1.42. This value of KG higher than 1 indicates that the watershed of sokouraba is of elongated shape. The specific gradient value of the watershed is 61.99. This value is included between 50 and 100 m, thus according to the classification of the reliefs the latter, the relief of the catchment area of Sokouraba can be qualified as moderate. The values of the length of the main watercourse and the total length of the watercourses calculated are respectively 15,41Km and 63,25 Km. The calculated value of the drainage density of the catchment area is 0.21 Km-1. The value of the attenuation coefficient and the ten-year rainfall calculated in this study are 0,78 and 100,062 mm respectively. The value of the decennial runoff coefficient thus calculated is 27,83%.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrological Investigation and Characterization of Sokouraba Watershed, Burkina Faso

Harouna

Daou²,

Hassan³

et al. 2022

CJAST

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show abstract

“…In such droughtprone contexts, improving local resilience through integrated water management should both consider land use decisions, water use and allocation [Belemtougri et al, 2021, Fovet et al, 2021, Kafando et al, 2021, Zipper et al, 2018. This, in turn, requires, at the core, a deeper understanding of the individual and combined contributions of climate and land use changes on the hydrological cycle, which is generally not well assessed, especially for such West African watersheds [Aich et al, 2015, Yira et al, 2017, Yonaba, 2020, Gbohoui et al, 2021.…”

Section: Introductionmentioning

confidence: 99%

Future climate or land use? Attribution of changes in surface runoff in a typical Sahelian landscape

Yonaba¹,

Mounirou²,

Fowé³

et al. 2024

Comptes Rendus. Géoscience

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“…The water yield coefficient is an indicator of the capacity of regional water yield, which refers to the proportion of water yield to precipitation. The water yield coefficient has changed under the dual impacts of climatic variation and human activity, profoundly influencing the development and utilization of available water resources (Liu et al, 2016;Schwärzel et al, 2020;Gbohoui et al, 2021). Climate variation, accompanied by temperature increments and extreme precipitation, have fundamentally affected the state of water resources (Capo et al, 2018;Li and Wang, 2021;Ouyang, 2021).…”

Section: Introductionmentioning

confidence: 99%

Evolution and attribution of the water yield coefficient in the Yiluo river basin

Hou

Yan

Qin

et al. 2022

Front. Environ. Sci.

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Our aim in this research was to detect historical and future water yield coefficient evolution and attribution. Based on the calibrated and validated water yield coefficient model in the Yiluo River Basin, the coefficient for the years 2000–2020 was simulated, along with the future projection for 2030–2050 under four Shared Socioeconomic Pathways (SSP126, SSP245, SSP370, and SSP585). The spatio-temporal evolution of historical and future water yield coefficients was then analyzed. Moreover, the geographical detector model was used to detect the impacts of climate, land use, and terrain factors on the water yield coefficient. The results showed that the water yield coefficient increased by 8.53% from 2000 to 2020, with the coefficient of farmland increasing by 10.47% and that of forestland decreasing by 8.93%. The coefficient was highest under the SSP370 scenario and the lowest under the SSP585 scenario in projections for 2030–2050. Compared to 2000–2020, the coefficients of the two scenarios increased by 12.2% and 2.0%, respectively. Consequently, under the SSP370 and SSP585 scenarios, the coefficient of farmland increased by 13.2% and 2.7%, and that of the forestland decreased by 0.9% and 14.6%, respectively. Driving factors detection indicated that land use types had the strongest explanatory power affecting the water yield coefficient; the explanatory value reached 26.5% in 2000–2020 and will exceed 29.5% in 2030–2050. In addition, the interaction between any two factors was stronger than a single factor. This research provides scientific support for the precise management of watershed and water-land resources.

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Impacts of climate and environmental changes on water resources: A multi-scale study based on Nakanbé nested watersheds in West African Sahel

Cited by 34 publications

References 79 publications

Hydrological Investigation and Characterization of Sokouraba Watershed, Burkina Faso

Hydrological Investigation and Characterization of Sokouraba Watershed, Burkina Faso

Future climate or land use? Attribution of changes in surface runoff in a typical Sahelian landscape

Evolution and attribution of the water yield coefficient in the Yiluo river basin

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