Characterization of Meteorological Droughts Occurrences in Côte d’Ivoire: Case of the Sassandra Watershed

Santé, Natacha; N'go, Yao Alexis; Soro, Gneneyougo Émile; Meledje, N’Diaye Hermann; Goula, Bi Tié Albert

doi:10.3390/cli7040060

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…Artificial dams and small reservoirs were observed at the fringes of some of the areas where we detected natural vegetation losses. The transition of natural vegetation to water bodies may indicate natural flooding or anthropogenic development of pounds and small reservoirs for cropland irrigation, dams for hydro-power generation, urban supply and consumption, as well as other economic purposes [23,24,27,56,86,95,107,[112][113][114][115][116][117][118]. These developments could possibly be explained as adaptation measures adopted in some parts of West Africa to mitigate the impact of the severe drought of the 1970s and the 1980s.…”

Section: Lulc Transitions and Underlying Driving Factorsmentioning

confidence: 99%

Mapping Land Use Land Cover Transitions at Different Spatiotemporal Scales in West Africa

Barnieh

Menenti

et al. 2020

Sustainability

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Post-classification change detection was applied to examine the nature of Land Use Land Cover (LULC) transitions in West Africa in three time intervals (1975–2000, 2000–2013, and 1975–2013). Detailed analyses at hotspots coupled with comparison of LULC transitions in the humid and arid regions were undertaken. Climate and anthropic drivers of environmental change were disentangled by the LULC transitions analyses. The results indicated that human-managed LULC types have replaced the natural LULC types. The total vegetation cover declined by −1.6%. Massive net gains in croplands (107.8%) and settlements (140%) at the expense of natural vegetation were detected in the entire period (1975–2013). Settlements expanded in parallel with cropland, which suggests the effort to increase food production to support the increasing population. Expansion of artificial water bodies were detected in the humid regions during the period of 1975–2000. Nonetheless, shrinking of water bodies due to encroachment by wetlands and other vegetation was observed in the arid regions, coupled with net loss in the whole of West Africa. The results indicate deforestation and degradation of natural vegetation and water resources in West Africa. Underlying anthropic drivers and a combination of anthropic and climate drivers were detected. LULC transitions in West Africa are location specific and have both positive and negative implications on the environment. The transitions indicate how processes at the local level, driven by human activities, lead to changes at the continental level and may contribute to global environmental change.

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Section: Lulc Transitions and Underlying Driving Factorsmentioning

confidence: 99%

Mapping Land Use Land Cover Transitions at Different Spatiotemporal Scales in West Africa

Barnieh

Menenti

et al. 2020

Sustainability

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“…However, climate change has had an impact on these resources and is expected to increase in the coming days. Climate change, coupled with an ever-increasing population and limited availability of fresh Numerous studies have highlighted the fact that West African watersheds would experience more severe and more frequent droughts (Faye, Sow, & Ndong, 2015;Santé, N'Go, Soro, Meledje, & Goula, 2019). The increase in air…”

Section: Discussionmentioning

confidence: 99%

Evaluation of extreme flow characteristics in the Casamance watershed upstream of Kolda using the IHA/RVA method

Sadio,

Faye

2023

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Understanding water availability is essential for the development and management of water resources, as well as for designing interventions for river health. Climate change/variability impacts the hydrology of a river system, which subsequently affects human and ecological health by altering the structure and function of the aquatic ecosystem. This study therefore aims to assess water availability and river health according to current and future climate scenarios in the Casamance watershed upstream of Kolda. Climate change is expected to increase hydrologic alterations from low (currently) to high (in the future), as revealed by the Indicators of Hydrologic Alteration (IHA) tool. Average annual water availability decreased, varying seasonally, and seasonal trends followed annual trends under Shared Socioeconomic Pathways (SSP) scenarios. In the basin, negative developments in minimum and maximum annual conditions are generally decreasing over the future period, compared to the reference period (1985-2014), with the exception of the minimum flow rate over 7 and 30 days on SSP 126 and the minimum flow rate over 30 days and the maximum flow rate 1, 3 and 7 days on SSP 585. In this SSP 585 scenario, the Mann Kendall test on the minimum flow rate and the flow rate maximum indicate the most significant downward trend with a risk of error of 0.05, with a Kendall tau varying from -0.45 m3/s/year to - 0.05 m3/s/year. For the minimum flow parameters, Kolda station shows negative Hydrological Alteration (HA) values for the high RVA category, which results in a decrease in low flow.

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“…This situation is exacerbated by reduced rainfall observed in West Africa and Côte d'Ivoire. Current studies have shown that the decline in rainfall that began in the early 1970s is continuing [7] [15] [33] [34] [35]. Its effects led not only to a reduction in the operating flow rates of the hydraulic structures but also to a drying up of certain boreholes [36].…”

Section: Discussionmentioning

confidence: 99%

Using “Water Evaluation and Planning” (WEAP) Model to Simulate Water Demand in Lobo Watershed (Central-Western Cote d’Ivoire)

Yao¹,

Mangoua²,

Georges³

et al. 2021

JWARP

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Climate change continues to pose a threat to the sustainability of water resources while, water need is increasing. In spite of the efforts made by the state authorities to build water infrastructure, a large majority of the population is not having access to drinking water. In this study, Water Evaluation and Planning (WEAP) model was used to model the current situation of water supply and demands, to create scenarios for future water demands and supply. The results show that, in contrast to the livestock sector, which has a zero DNS, huge deficits are observed in reference scenario. These unsatisfied demands (DNS) are dominated by deficits in rice irrigation. The analysis of the evolution of demand according to the growth scenarios has shown that the deficits already observed in the reference scenario will reach 100.45 × 10 6 m 3 in 2040. To mitigate the effects of such deficits, water management optimization measures have been proposed. Strengthening the water supply to urban centers from the creation of dams could considerably reduce the observed deficits. These results are an important decision support tool for sustainable water resource management in the Lobo watershed. However, these strategies to improve access to water depend on the government's political will on water and economic opportunities.

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Characterization of Meteorological Droughts Occurrences in Côte d’Ivoire: Case of the Sassandra Watershed

Cited by 12 publications

References 26 publications

Mapping Land Use Land Cover Transitions at Different Spatiotemporal Scales in West Africa

Mapping Land Use Land Cover Transitions at Different Spatiotemporal Scales in West Africa

Evaluation of extreme flow characteristics in the Casamance watershed upstream of Kolda using the IHA/RVA method

Using “Water Evaluation and Planning” (WEAP) Model to Simulate Water Demand in Lobo Watershed (Central-Western Cote d’Ivoire)

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