Trends and Temporal of Rainfall Erosion due Variability Rainfall in Nakambè Watershed, Burkina Faso

Authors

  • Joseph Yaméogo

    Department of Human Sciences and Society, Ziniaré University Center/Joseph KI-ZERBO University, Ouagadougou 7021, Burkina Faso
  • Songanaba Rouamba

    Department of Geography, Norbert ZONGO University, Koudougou 376, Burkina Faso
  • Suzanne Koala

    Department of Geography, Norbert ZONGO University, Koudougou 376, Burkina Faso
  • Richard Zongo

    Department of Geography, Norbert ZONGO University, Koudougou 376, Burkina Faso

DOI:

https://doi.org/10.30564/jasr.v8i2.10301
Received: 25 February 2025 | Revised: 1 April 2025 | Accepted: 8 April 2025 | Published Online: 18 April 2025

Abstract

Understanding how rain erosion evolves and what determines it can contribute to the better management of soil resources. This study analyses the evolution of rain erosion in the Nakambè catchment in Burkina Faso between 1992 and 2022. Monthly rainfall data for this period were extracted from NASA POWER. Erodibility indices were then employed to evaluate the extent of erosion. Precipitation variability was assessed using the coefficients of variation and the standardized precipitation index. The study shows that precipitation varied within the catchment area during this period. This variation is seasonal, as it fluctuates before, during and after the rainy season, with a coefficient of variation ranging from 18 during the rainy season to 556.18 after the rainy season. The catchment also exhibits multi-year fluctuations, long-term fluctuations or perennial variations (1992–2004 and 2004–2022). The study also shows that rain erosion varies annually and seasonally. The Fournier, Arnoldus and rainfall concentration indices indicate variability in erosivity, with a significant increase in August. It also appears that rainfall trends and variability have an impact on erosion in the catchment. For example, erosion increases with precipitation concentration and the standardized rainfall anomaly over the period 1992-2022. The cumulative effect of precipitation concentration—reflected in increased rainfall during July and August—along with the wet phase of the 1992–2022 period, are the main determining factors for rain erosion in the catchment. It is therefore important to limit the construction of dams in the basin, as they may contribute to the continued degradation of the catchment.

Keywords:

Nakambé Watershed; Rainfall Variability; Erosion Index Trends; Burkina Faso

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Yaméogo, J., Rouamba, S., Koala, S., & Zongo, R. (2025). Trends and Temporal of Rainfall Erosion due Variability Rainfall in Nakambè Watershed, Burkina Faso. Journal of Atmospheric Science Research, 8(2), 65–85. https://doi.org/10.30564/jasr.v8i2.10301

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Vol. 8 , Iss. 2 (April 2025)

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Copyright © 2025 Joseph Yaméogo, Songanaba Rouamba, Suzanne Koala, Richard Zongo

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