Impact of climate and anthropogenic changes on current and future variability in flows in the Nyong River Basin (equatorial central Africa)

Ebodé, Valentin Brice

doi:10.21203/rs.3.rs-2180457/v1

Cited by 2 publications

(1 citation statement)

References 65 publications

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“…Beyond the climate change that is currently raging throughout Cameroun and Central Africa (Ebodé et al, 2020;Ebodé, 2022c), the studied basin (Mefou) has experienced accelerated and uncontrolled urbanization through an excessive spatial extension of the Yaounde city (Ebodé, 2022d;Ebodé, 2022e), whose population has multiplied by 10 in about thirty years, from 50 000 in 1957 to 1 500 000 in 2008.…”

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confidence: 99%

Hydropluviometric variability in a forest watershed undergoing accelerated urbanization: the case of Mefou (South Cameroon)

Ebodé¹

2022

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This article has as objective to investigate the impact of rainfall variability and land use changes on river discharge in the Mefou basin over the recent period (1963–2018). To achieve this goal, hydrometeorological data of this basin were analyzed using the Pettitt test. Likewise, land use changes were also analyzed using supervised classifications of Landsat satellite images at two periods (1973 and 2018). Average and extreme flows of Mefou river have increased since 1985-86, unlike the rainfall, which generally decreased for all seasons from the 1970s, apart from summer, where the reverse was observed. Changes in land use (increase impervious areas and a decrease in forest and water bodies) seem to be the main cause of the increase in runoff observed. The rainfall plays an essentially amplifying role in the increase in discharge in the seasons during which they occur. Those having experienced an increase or a maintenance of rainfall (summer and spring) recorded the most significant increases in discharges. These results could be useful for the improvement of future simulations of the Mefou river flow and the prevention of socio-environmental disasters like floods in the basin.

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Section: Introductionmentioning

confidence: 99%

Hydropluviometric variability in a forest watershed undergoing accelerated urbanization: the case of Mefou (South Cameroon)

Ebodé¹

2022

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Effects of climate and anthropogenic changes on future variability in flows in the So’o River Basin (South of Cameroon)

Ebodé¹

2022

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Due to climate and environmental changes, sub-Saharan Africa (SSA) has experienced several drought and flood events in recent decades with serious consequences on the economy of the sub-region. In this context, the region needs to enhance its capacity in water resources management, based on reliable forecasts. The objective of this article was to study the evolution future (near (2022-2060) and distant (2061-2100)) flows in the So’o River Basin (SRB) in Cameroon. The Cellular Automata (CA)-Markov was used to predict the future land cover evolution of the basin, and the outputs of two regional climate models-RCMs (RCA4 and CCCma) were used to predict the future climate in the basin. Distribution mapping was used for correcting precipitation and temperature biases in the outputs of the climate models used. The soil and water assessment tool (SWAT) model was used to simulate the future flows in the SRB. The results obtained show that a change in precipitation in line with the predictions of the CCCma model will lead to a decrease in river discharge in the basin, except under the RCP8.5 scenario during the second period (2061-2100), where will note an increase compared to the historical period of approximately +4%. It is projected that the decrease in precipitation and river discharge will occur mostly in the autumn months during 2020s, 2040s and 2070s. Results from the RCA4 model project an increase in precipitation which will lead to an increase in river discharge by more than +50%, regardless of the period and the scenario considered. In general, this increase will be greater during the dry seasons (winter and summer), while the decades at the end of the century (2080 to 2100) will be the wettest. An increase in discharges was noted in some cases despite a drop in rainfall, particularly in the case of discharges simulated for the second period (2061-2100) from the outputs of the CCCma model. This seems to be a consequence of the increase in impervious spaces, all the more the runoff increases during this period according to the model. Results from this study could be used to enhance water resources management in the basin investigated and the region.

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Impact of climate and anthropogenic changes on current and future variability in flows in the Nyong River Basin (equatorial central Africa)

Cited by 2 publications

References 65 publications

Hydropluviometric variability in a forest watershed undergoing accelerated urbanization: the case of Mefou (South Cameroon)

Hydropluviometric variability in a forest watershed undergoing accelerated urbanization: the case of Mefou (South Cameroon)

Effects of climate and anthropogenic changes on future variability in flows in the So’o River Basin (South of Cameroon)

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