Analysis of drought patterns in the Tano river basin of Ghana

The objective of this study is to analyze drought patterns in the Tano River Basin (TRB) Ghana using Standardized Precipitation Index (SPI) and Reconnaissance Drought (RDI). data from 1981 2019 for TRB was accessed Climate Hazards Group InfraRed with Station (CHIRPS), extracted into time Series Python four locations within basin used analysis together National Aeronautics Space Administration (NASA) POWER (Prediction Of Worldwide Energy Resource) Temperature data. Anderson-Darling test performed check normality precipitation. Two separate station sets TAHMO Earth Observation Research Innovation Centre (EORIC) were validate CHIRPS Scaler (SI) two are respectively 0.383 0.016. This indicates sufficiently accurate. SPI RDI on scales 1, 3, 6 12 months calculated Indices Calculator (DrinC) software characterized magnitude, duration, severity drought. Regression compare values. results show that coefficient regression R 2 0.9789, 0.9689 0.8799 respectively. a stronger correlation between However, observed decreases increasing scale, which means shorter scales, more similar than longer scales. To further examine possible impacts climate change profile basin, Mann-Kendall trend conducted trends timescales. Apart Tanoso recorded decrease – 0.17 as against 0.14 6, all other timescales an increase compared SPI. Although most these increases not significant at 10% significance level, 1.95 1.71 1 Buako Sepremboi same stations. These suggests impact since estimation takes consideration potential evapotranspiration (PET), factor temperature. could have negative implications agricultural production drinking water supply considering solely relies surface crop .