IAHS2022-176, updated on 22 Sep 2022
https://doi.org/10.5194/iahs2022-176
IAHS-AISH Scientific Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Modelling of meteorological drought using the SPI and SPEI indices in the Volta watershed in Togo

Pilabina Somiyabalo, Yabi Ibouraïma, and Amoussou Ernest
Pilabina Somiyabalo et al.
  • Lome, Geography, Togo (spilabina85@gmail.com)

Drought is an insidious scourge that results from a decline in precipitation from levels considered normal. The data used cover a period of 118 years (1901-2019) which ensures a good coverage of the studied region. Two approaches (SPI and SPEI) were applied to assess drought in the Volta bassin in Togo. The results show that there has been a decrease in rainfall in the Volta bassin in Togo in recent years. In terms of SPI, 36 years have indices lower than -0.5 and 4 years lower than -1 in the Dapaong station. The longest periods of drought are observed between 1958-1990 or 33 years and 2010-2019 or 10 years. The SPEI show 9 years with an index lower than -0.5 and only one year (2001) with an index lower than -1. The longest droughts occurred during the period 2009-2019, or 10 years, as for the IPS. This shows a trend of aridification of the climate in this area.

How to cite: Somiyabalo, P., Ibouraïma, Y., and Ernest, A.: Modelling of meteorological drought using the SPI and SPEI indices in the Volta watershed in Togo, IAHS-AISH Scientific Assembly 2022, Montpellier, France, 29 May–3 Jun 2022, IAHS2022-176, https://doi.org/10.5194/iahs2022-176, 2022.