Abstract
Frequency analysis of rainfall data enables to determine the future extreme events and developing IDF curves. The object of this study was to analysis the frequency of extreme events in precipitation, and develop Intensity, duration and frequency (IDF) curves. In this study 30 years daily rainfall data (1986-2015) from the National Meteorological Agency (NMA) was used. To develop IDF curves graphical and statistical methods were used. The result obtained indicates, the General Extreme Value (GEV) was the best fitted distribution function to the maximum annual daily observed data, at 95% of confidence interval. As the result of the computed sub daily rainfall data, the highest rainfall value for the duration of 24 hrs. and 100-year return period was 83.86 mm, whereas the lowest rainfall value was obtained for the duration of 10min and 2 year of return period was 13.34 mm. The correlation coefficient between the IDF curves developed from observed data and the Computed IDF curves was (R 2 =0.99). Keywords: - extreme events, frequency analysis, IDF curves, rainfall duration DOI: 10.7176/JNSR/12-21-02 Publication date: November 30 th 2021
Highlights
The rapid increment of greenhouse gas emissions has a severe impact on global warming and is affecting weather patterns all over the world (Vucetic & Simonovic, 2011)
4.Conclusion Analysis of rainfall and determination of annual maximum daily rainfall would enhance the management of water resources applications as well as effective utilization
This study aimed at applying frequency analysis to assess extreme events of rainfall in the area
Summary
The rapid increment of greenhouse gas emissions has a severe impact on global warming and is affecting weather patterns all over the world (Vucetic & Simonovic, 2011). The rising temperatures increase the atmosphere water holding capacity which is estimated about 7% per 10C warming and directly affecting precipitation. In this case the higher atmospheric water vapor can lead to more intense precipitation events (Cheng & Aghakouchak, 2014). There are changes in seasonal patterns and extremes of rainfall. Among climate extreme events floods can be occurred because of excess rainfall, unplanned drainage systems, soil degradation and soil textures (Ouma & Tateishi, 2014)
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