Drought Index Analizes With Rainfall Patern Indicators Use SPI Method (Case Study Bangga Watershed)
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 5
Abstract
Irregular weather and climate changes caused by El – Nino effect drought in some areas, including in Indonesia. The location of this study lies in the Bangga watershed. The purpose of this study was to determine rainfall patterns, drought level, the worst drought that occurred and the prediction for the future. One method for analysis of drought is using SPI (Standardized Precipitation Index). This method aims to calculate the value of a drought index that would indicate the level of the existing drought in a region. Data used are monthly rainfall from two station for 23 years (year 1993-2015). After analyzing the drought, the projection made with software Makesens 1.0. The study results showed that the worst drought in Bangga watershed occurred in April 2015 with drought index -3516 for one monthly SPI, -2815 for three monthly SPI, -3254 for six monthly SPI, -2171 for nine monthly SPI, and - 2922 for twelve 12 monthly SPI. Once projected until 2050, generally Bangga watershed experiencing dry conditions with the worst drought in July with a value of -3.83 for one monthly SPI, -3.65 for three monthly SPI, -3.44 for six monthly SPI, -2.6 for nine monthly SPI and -2.32 for twelve monthly SPI.
Authors and Affiliations
Beti Mayasari, I Wayan Sutapa, Andi Rusdin
Keywords
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