Validating Reanalysis Global Precipitation Products (ECMWF) Using Intensity-Duration-Frequency Curves In Upper Blue Nile Basin
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Date
2016-10
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Addis Ababa University
Abstract
Accurate knowledge of precipitation amounts reaching on the land surface has a big role on water resources management. The IDF relationship simplifies the above issue by developing the relationship of intensity of precipitation occurring over a specified period with frequency. The main objective of this paper is to validate intensity-duration –frequency relationships (IDF) curves using reanalysis precipitation product for BLUE NILE BASIN. EVI were used to obtain the IDF curves for eight different durations (30, 60, 120, 180, 300, 360, 720, 1440 mints) for observed one and (180, 360, 540, 720, 1080, 1440) for reanalysis of ECMWF data with six frequency periods (2, 5, 10, 25, 50, 100 years). Estimation of the parameters of the IDF equations for different return periods was performed using linear regression analysis with the help of MIDUSS version 2.25, revision 473 software. Rainfall intensities, rainfall quintiles and raw data were compared to the observed one. Station like Dangila and Mekaneselam overestimated the data with increasing both return period and duration. Station like mehalmeda and Gonder shows normal status with increasing duration and return period. The result showed that above 58-60% of the output IDF parameter data UNDERESTIMATED by ECMWF. Additionally, 26-28% of the data captures the observed data and the rest OVERESTIMATED by the product. From the result obtained above it can be concluded that the storm (extreme event) components of precipitation product of ECMWF need further improvement before using it to develop IDF curves and use it for design and planning of projects in Blue Nile.
KEY WORDS: IDF, ECMWF (ERA INTERIM/LAND), UPPER BLUE NILE BASIN, INTENSIT
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Idf, Ecmwf (Era Interim/Land), Upper Blue Nile Basin, Intensity