N’Guessan Kouamé Emmanuel ABO¹, Emile Gneneyougo SORO¹, Blé Anouma Fhorest YAO^1,

This study assesses the hydrological dynamics of the Bandama River Basin in Côte d’Ivoire under increasing climatic and anthropogenic pressures. Hydroclimatic series (1950–2020) of rainfall, temperature, evapotranspiration, and discharge were analyzed using statistical tests (cumulative deviation, Kruskal–Wallis, Mann–Kendall, SNHT) to identify breakpoints, trends, and spatio-temporal variability. The results reveal strong interannual variability of river discharge (CV = 74.5%) compared to rainfall (CV = 14.3%) and potential Evapotranspiration (PET) (CV = 5.5%). Significant hydro-climatic breakpoints were detected around 1970–1976 and 1994. The assessment of relative contributions using the climate elasticity method and Budyko decomposition shows the predominance of human activities (75–79%) over climatic factors (21–24%) in explaining mean discharge variations at Tiassalé. These findings highlight that the proliferation of dams, agricultural expansion, deforestation, and urbanization are now the main drivers of hydrological alterations, outweighing the effect of climate. The study provides scientific references to support sustainable and integrated water resources management in the Bandama Basin.

Bandama Basin, hydroclimatic variability, streamflow, anthropogenic factors, Budyko, climate elasticity