Authors :
KONE Brahima; OUATTARA Ismaïla; COULIBALY Léréyaha; DAO Amidou; FADIKA Vamoryba; NOUFE Dabissi Djibril; KAMAGATE Bamory
Volume/Issue :
Volume 7 - 2022, Issue 6 - June
Google Scholar :
https://bit.ly/3IIfn9N
Scribd :
https://bit.ly/3bOmXoy
DOI :
https://doi.org/10.5281/zenodo.6794500
Abstract :
This research work appears to be useful for
understanding phenomena such as the impact of land use
dynamics on surface runoff from one period to another.
Located in the south-east of Côte d'Ivoire, the Agnéby
catchment area, with a surface area of 8640 km2, has
undergone changes in its vegetation cover between the
periods 1988-2020. These changes have resulted in the
regression of dense forest with a loss of 53% to the
benefit of crops and fallow land with a gain of 41%. Bare
soil and water habitats have increased by 5% and 2% of
the total area of the basin. During the same period, the
annual retention capacity indexes fell from 162.08 in
1998 to 102.56 in 2020 with an annual regression rate of
0.38. On the other hand, the average annual runoff
coefficients have increased from 12.80% to 23.77%. In
the near and distant future, the Agnéby area will
experience a form of degradation in view of its rapid
economic growth, where there is no policy of sustainable
management of natural resources. In this context, crops
and fallow land and bare soil habitats will be dominant
and will occupy proportions of 64.56% and 12.40%
respectively in 2050 and 67.20% and 14.33% in 2080.
For these same horizons, the retention capacity indices
will be 94.48 and 90.51 in 2050 and 2080 respectively.
The annual runoff coefficients will be 25.66 in 2050 and
26.70 in 2080. These different values of the retention
capacity indices and runoff coefficients show that the
basin has experienced and will experience a strong
degradation under the scenario of rapid economic
growth. Decision-makers and stakeholders in charge of
territorial management must therefore take these results
into account in their decision-making. The values of the
runoff indices and coefficients show the total
anthropisation of the Agnéby catchment area and the
impact of the dynamics on the surface runoff in the near
and distant future.
Keywords :
Impact ;land use dynamics; runoff ;Agnéby watershed ;Ivory Coast
This research work appears to be useful for
understanding phenomena such as the impact of land use
dynamics on surface runoff from one period to another.
Located in the south-east of Côte d'Ivoire, the Agnéby
catchment area, with a surface area of 8640 km2, has
undergone changes in its vegetation cover between the
periods 1988-2020. These changes have resulted in the
regression of dense forest with a loss of 53% to the
benefit of crops and fallow land with a gain of 41%. Bare
soil and water habitats have increased by 5% and 2% of
the total area of the basin. During the same period, the
annual retention capacity indexes fell from 162.08 in
1998 to 102.56 in 2020 with an annual regression rate of
0.38. On the other hand, the average annual runoff
coefficients have increased from 12.80% to 23.77%. In
the near and distant future, the Agnéby area will
experience a form of degradation in view of its rapid
economic growth, where there is no policy of sustainable
management of natural resources. In this context, crops
and fallow land and bare soil habitats will be dominant
and will occupy proportions of 64.56% and 12.40%
respectively in 2050 and 67.20% and 14.33% in 2080.
For these same horizons, the retention capacity indices
will be 94.48 and 90.51 in 2050 and 2080 respectively.
The annual runoff coefficients will be 25.66 in 2050 and
26.70 in 2080. These different values of the retention
capacity indices and runoff coefficients show that the
basin has experienced and will experience a strong
degradation under the scenario of rapid economic
growth. Decision-makers and stakeholders in charge of
territorial management must therefore take these results
into account in their decision-making. The values of the
runoff indices and coefficients show the total
anthropisation of the Agnéby catchment area and the
impact of the dynamics on the surface runoff in the near
and distant future.
Keywords :
Impact ;land use dynamics; runoff ;Agnéby watershed ;Ivory Coast