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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sumber Daya Air
Nugraheni, Melly
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Civil Engineering, Building, Construction & Architecture Energy Engineering Environmental Science

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Pola Curah Hujan di Provinsi Indonesia Saat El-Nino dan La-Nina: Analisis Periodogram FFT dan Lomb Nugraheni, Melly; Zakaria, Ahmad; Wahono, Endro Prasetyo; Kusumastuti, Dyah Indriana; Herison, Ahmad
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 2, DESEMBER 2024
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i2.65646

Abstract

Indonesia is a country affected by the El Nino and La Nina climate anomalies. The provinces of Aceh, Central Kalimantan, and Maluku are three regions representing parts of Indonesia that have a variety of rainfall distribution and climatic conditions. This research was conducted to determine the influence of the El Nino and La Nina climate anomalies on these three regions by looking at the areas that have a dominant influence due to these climate anomalies. The research used BMKG Indonesia rainfall data with a total of 16 rainfall stations and a data range of 22 years. The methods used for modeling are the Fast Fourier Transform (FFT) and Lomb Periodogram to obtain rainfall spectrum data. Then, the amplitude value was obtained, and a comparison of the data from the two methods was carried out to determine the recurrence value and the area with the highest impact due to climate anomalies. The results of data analysis according to the FFT and Lomb Periodogram showed that the highest affected area was the eastern part of Indonesia, namely Maluku Province, with the dominant frequency according to the FFT method being 5.61 years with a PSD of 7.67 mm2 and the Lomb Periodogram 6.06 years with a PSD of 18.64 mm2. Based on the average PSD value, using both FFT and Lomb Periodograms, it also shows that the influence of El Nino and La Nina is greatest in the eastern part of Indonesia; as you move towards the west, this influence decreases. The smallest influence occurred in western Indonesia. This shows that the influence of ENSO is more dominant than the influence of IODM.
Analisis Pengaruh Fenomena Iklim El-Nino dan La-Nina terhadap Curah Hujan di Kalimantan Tengah Nugraheni, Melly; Zakaria, Ahmad
Jurnal Teknik Sumber Daya Air Vol. 3 No. 2 (Desember 2023)
Publisher : Himpunan Ahli Teknik Hidraulik Indonesia (HATHI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56860/jtsda.v3i2.83

Abstract

Central Kalimantan is one of the regions in Indonesia affected by El Nino and La Nina climate anomalies. This study was conducted to determine the effect of El Nino and La Nina climate anomalies or deviations on rainfall in Central Kalimantan. The purpose of this study was to look at the areas that have the most influence caused by El Niño and La Nina climate anomalies. This study used daily rainfall data from the Meteorology, Climatology and Geophysics Agency (BMKG) station and also the Tropical Rainfall Measurement Mission (TRMM) satellite in Central Kalimantan with a data range of 22 years, from 1998 to 2019. Spectral methods are used as modeling and use the Fast Fourier Transform (FFT) program to obtain rainfall spectrum data. Then the amplitude value is obtained and the data comparison is carried out to determine the value of the correlation relationship. The results of data analysis according to the results of Fast Fourier Transform (FFT) obtained that the area that has the highest influence due to El Nino and La Nina climate anomalies or deviations based on BMKG and TRMM data is at the H. Asan station. The dominant frequency period of recurrence for BMKG data is 3.74 years with an amplitude value of 1.4641 mm and TRMM data is 2.80 years with an amplitude value of 0.9829 mm.
Co-Authors Ahmad Herison Ahmad Zakaria Dyah Indriana Kusumastuti Endro Prasetyo Wahono