Analisis Sebaran Awan Konvektif Penyebab Banjir Di Kabupaten Nganjuk Menggunakan Metode Red Green Blue dan Cloud Convective Overlays
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Abstract
Abstract—Indonesia is a maritime country located on the equator, causing Indonesia to have a tropical climate. This causes a lot of convective clouds to grow because they get water supply from the sea so that information on the distribution of convective clouds is important for weather analysis purposes. On December 13, 2020, floods submerged several villages in Pace District, Nganjuk Regency due to the overflow of the Kolosoko river due to heavy rains. The purpose of this study was to see the distribution of convective clouds during heavy rains in Pace District. The data used in this study is Himawari-8 satellite data channels 3, 4, 5, 7, 8, 10, 13 and 15 to process the distribution of convective clouds. This research uses descriptive analysis method with daily weather parameters and Himawari-8 satellite imagery. Analysis of satellite image data using Cloud Convective Overlays (CCO) and Red Green Blue (RGB) CS and NC methods. This method is used to view the image of convective clouds making it easier to analyze the distribution of convective clouds. The results obtained in satellite images show significant growth of convective clouds while in weather radar images show moderate rain reflectivity due to radar limitations.
Keywords: flood, heavy rain, convective clouds, himawari-8
Abstrak—Indonesia merupakan negara maritim yang terletak di khatulistiwa sehingga menyebabkan Indoneisa beriklim tropis. Hal ini menyebabkan banyak awan konvektif yang tumbuh karena mendapat pasokan air dari laut sehingga informasi sebaran awan konvektif penting untuk keperluan analisis cuaca. Pada tanggal 13 Desember 2020 banjir merendam beberapa desa di Kecamatan Pace, Kabupaten Nganjuk akibat meluapnya sungai Kolosoko karena hujan lebat. Tujuan penelitian ini adalah untuk melihat sebaran awan konvektif saat hujan lebat di Kecamatan Pace. Data yang digunakan pada penelitian ini yaitu data satelit Himawari-8 kanal 3, 4, 5, 7, 8, 10, 13 dan 15 untuk mengolah sebaran awan konvektif. Penelitian ini menggunakan metode analisis deskriptif dengan parameter cuaca harian dan citra satelit Himawari-8. Analisis data citra satelit menggunakan metode Cloud Convective Overlays (CCO) serta Red Green Blue (RGB) CS dan NC. Metode tersebut digunakan untuk melihat citra awan konvektif sehingga mempermudah dalam menganalisis sebaran awan konvektif. Hasil yang diperoleh dalam citra satelit menunjukan pertumbuhan awan konvektif yang signifikan sedangkan dalam citra radar cuaca menunjukan reflektivitas hujan sedang karena adanya limitasi radar.
Kata kunci: banjir, hujan lebat, awan konvektif, himawari-8
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References
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