ESTIMATION OF THE GENERAL EQUATION FOR THE INTENSITY-DURATION-FREQUENCY (IDF) CURVE OF RAINFALL USING GLOBAL PRECIPITATION MEASUREMENTS SATELLITE DATA (CASE STUDY: JAVA ISLAND)

• Main Author: Fauzy Ridwan, Fahmi
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/77238
• Institution: Institut Teknologi Bandung

Extreme rainfall is one of the phenomena that can lead to hydro-meteorological disasters, such as floods. The magnitude of extreme rainfall varies in different regions due to the diverse weather characteristics of each area. One of the methods to analyze extreme rainfall is by using the Intensity-Duration-Frequency (IDF) curve. The data used in this study is from the Global Precipitation Measurement (GPM) satellite, covering a duration of 30 minutes from 2000 to 2021. The equations used are a modification of the Chen equation, where its duration function is combined with the Sherman and Kimijima equations. Meanwhile, the rainfall intensities are estimated using the Gumbel frequency analysis (GEV I). The determination of the appropriate general IDF curve equation is done by comparing the estimated rainfall intensities from various methods with the results of the Gumbel frequency analysis, based on the Root Mean Squared Error (RMSE) values. The IDF curve estimation method using the Chen-Kimijima combination equation is generally suitable for the entire Java Island, as indicated by the smaller RMSE values compared to the Modified Chen and Chen-Sherman methods. All three methods exhibit similar patterns in forming the IDF curve when compared to the Gumbel frequency analysis IDF curve.