Error propagation of climate model rainfall to streamflow simulation in the Gidabo sub-basin, Ethiopian Rift Valley Lakes Basin

Adimasu Woldesenbet Worako*, Alemseged Tamiru Haile, Tom Rientjes, Tekalegn Ayele Woldesenbet

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
63 Downloads (Pure)

Abstract

This study assesses bias error of rainfall from climate models and related error propagation effects to simulated streamflow in the Gidabo sub-basin, Ethiopia. Rainfall is obtained from a combination of four global and regional climate models (GCM-RCMs), and streamflow is simulated by means of the Hydrologiska Byråns Vattenbalansavdelning (HBV-96) rainfall-runoff model. Five bias correction methods were tested to reduce the rainfall bias. To assess the effects of rainfall bias error propagation, percent bias (PBIAS), difference in coefficient of variation (CV), and 10th and 90th percentile indicators were applied. Findings indicate that the bias of the uncorrected rainfall caused large errors in simulated streamflow. All five bias correction methods improved the HBV-96 model performance in terms of capturing the observed streamflow. Overall, the findings of this study indicate that the magnitude of the error propagation varies subject to the selected performance indicator, bias correction method and climate model.
Original languageEnglish
Pages (from-to)1185-1198
Number of pages14
JournalHydrological sciences journal
Volume67
Issue number8
Early online date31 May 2022
DOIs
Publication statusPublished - 11 Jun 2022

Keywords

  • ITC-ISI-JOURNAL-ARTICLE
  • 22/2 OA procedure

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