Hydroclimatology of the Volta River Basin in West Africa: Trends and variability from 1901 to 2002
Long-term historical records of rainfall (P), runoff (Q) and other climatic factors were used to
investigate hydrological variability and trends in the Volta River Basin over the period 1901–
2002. Potential (Ep) and actual evaporation (E), rainfall variability index (δ), Budyko's aridity
index (IA), evaporation ratio (CE) and runoff ratio (CQ) were estimated from the available
hydroclimatological records. Mann-Kendall trend analysis and non-parametric Sen's slope
estimates were performed on the respective time series variables to detect monotonic trend …
investigate hydrological variability and trends in the Volta River Basin over the period 1901–
2002. Potential (Ep) and actual evaporation (E), rainfall variability index (δ), Budyko's aridity
index (IA), evaporation ratio (CE) and runoff ratio (CQ) were estimated from the available
hydroclimatological records. Mann-Kendall trend analysis and non-parametric Sen's slope
estimates were performed on the respective time series variables to detect monotonic trend …
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