Effect of bias correction of satellite-rainfall estimates on runoff simulations at the source of the Upper Blue Nile

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dc.creatorHabib, E.
dc.creatorHaile, Alemseged Tamiru
dc.creatorSazib, N.
dc.creatorZhang, Y.
dc.creatorRientjes, T.H.M.
dc.date2014
dc.date2016-11-01T13:39:36Z
dc.date2016-11-01T13:39:36Z
dc.date.accessioned2026-06-27T18:38:09Z
dc.descriptionResults of numerous evaluation studies indicated that satellite-rainfall products are contaminated with significant systematic and random errors. Therefore, such products may require refinement and correction before being used for hydrologic applications. In the present study, we explore a rainfall-runoff modeling application using the Climate Prediction Center-MORPHing (CMORPH) satellite rainfall product. The study area is the Gilgel Abbay catchment situated at the source basin of the Upper Blue Nile basin in Ethiopia, Eastern Africa. Rain gauge networks in such area are typically sparse. We examine different bias correction schemes applied locally to the CMORPH product. These schemes vary in the degree to which spatial and temporal variability in the CMORPH bias fields are accounted for. Three schemes are tested: space and time-invariant, time-variant and spatially invariant, and space and time variant. Bias-corrected CMORPH products were used to calibrate and drive the Hydrologiska Byråns Vattenbalansavdelning (HBV) rainfall-runoff model. Applying the space and time-fixed bias correction scheme resulted in slight improvement of the CMORPH-driven runoff simulations, but in some instances caused deterioration. Accounting for temporal variation in the bias reduced the rainfall bias by up to 50%. Additional improvements were observed when both the spatial and temporal variability in the bias was accounted for. The rainfall bias was found to have a pronounced effect on model calibration. The calibrated model parameters changed significantly when using rainfall input from gauges alone, uncorrected, and bias-corrected CMORPH estimates. Changes of up to 81% were obtained for model parameters controlling the stream flow volume.
dc.identifierhttps://hdl.handle.net/10568/77506
dc.identifier.urihttp://hdl.handle.net/123456789/161370
dc.languageen
dc.publisherMDPI
dc.rightsOpen Access
dc.sourceHabib, E.; Haile, Alemseged Tamiru; Sazib, N.; Zhang, Y.; Rientjes, T. 2014. Effect of bias correction of satellite-rainfall estimates on runoff simulations at the source of the Upper Blue Nile. Remote Sensing, 6(7):6688-6708. doi: https://doi.org/10.3390/rs6076688
dc.subjectrain
dc.subjectrunoff
dc.subjectsatellites
dc.subjectriver basins
dc.subjecthydrology
dc.subjectsimulation models
dc.subjectcalibration
dc.subjectcatchment areas
dc.subjectstream flow
dc.titleEffect of bias correction of satellite-rainfall estimates on runoff simulations at the source of the Upper Blue Nile
dc.typeJournal Article

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Instituto Internacional para el Manejo del Agua (IWMI)