Analisis Spasial Keterkaitan Fenomena Borneo Vortex Terhadap Hujan di Kalimantan Barat

Sudiar, Sudiar (2025) Analisis Spasial Keterkaitan Fenomena Borneo Vortex Terhadap Hujan di Kalimantan Barat. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada bulan November, Desember, Januari, dan Februari sepanjang tahun terdapat suatu fenomena Borneo Vortex di Barat Laut Pulau Kalimantan sampai sepanjang Laut Cina Selatan bagian Selatan. Fenomena ini terbentuk terus menerus dan sering dikaitkan dengan kejadian hujan lebat dan banjir. Beberapa penelitian sebelumnya menyebutkan bahwa terdapat pengaruh Borneo Vortex terhadap dinamika atmosfer dan perubahan jumlah curah hujan di wilayah tertentu. Namun, belum diketahui persentase pengaruh tersebut dan wilayah yang berdampak signifikan terutama di Kalimantan Barat. Penelitian ini akan mengidentifikasi dan memetakan pengaruh Borneo Vortex terhadap hari dan curah hujan di setiap wilayah Kalimantan Barat. Identifikasi kejadian Borneo Vortex dilakukan dengan melihat pola siklonik pada peta streamline 925 mb yang dihasilkan dari pengolahan data angin komponen U dan V dari tahun 2010/2011 sampai 2022/2023 periode November, Desember, Januari, dan Februari. Metode yang digunakan untuk mengetahui pengaruh Borneo Vortex terhadap hujan adalah koefisien determinasi yang kemudian diinterpolasi menggunakan teknik Inverse Distance Weighted (IDW) dengan nilai power 1 sampai 4. Pengaruh Borneo Vortex terhadap hujan diklasifikasi menjadi kategori rendah, sedang dan tinggi dan dipetakan berdasarkan area kecamatan. Dari analisis statistik, nilai power 1 merupakan hasil interpolasi terbaik karena memiliki nilai standard deviasi terkecil. Hasil penelitian menunjukkan pengaruh kejadian Borneo Vortex terhadap hari hujan lebih merata untuk wilayah Kalimantan Barat dengan kriteria sedang sebanyak 117 kecamatan atau 66,9%, sedangkan pengaruh terhadap curah hujan dengan kriteria rendah, sedang, dan tinggi masing-masing sebesar 73,7%, 22,9%, dan 3,4%. Kriteria tinggi lebih dominan di wilayah utara dan selatan Kalimantan Barat. Adapun frekuensi Borneo Vortex tertinggi terjadi pada bulan Desember sebesar 32,6%.
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In November, December, January, and February throughout the year there is a Borneo Vortex phenomenon in the northwest of Borneo Island to the South China Sea. This phenomenon forms continuously and is often associated with heavy rains and floods. Several previous studies have shown that the Borneo Vortex has an influence on atmospheric dynamics and changes in the amount of rainfall in certain regions. However, the percentage of influence and the areas that have a significant impact are not yet known, especially in West Kalimantan. This study will identify and map the influence of the Borneo Vortex on the day and rainfall in each region of West Kalimantan. The identification of the Borneo Vortex event was carried out by looking at the cyclonic pattern on the 925 mb streamline map resulting from the processing of wind data for the U and V components from 2010/2011 to 2022/2023 in the November, December, January, and February periods. The method used to determine the effect of the Borneo Vortex on rain is the determination coefficient which is then interpolated using the Inverse Distance Weighted (IDW) technique with power values of 1 to 4. The effect of the Borneo Vortex on rain is classified into low, medium and high categories which are then mapped based on sub-district area. From statistical analysis, the power value of 1 is the best interpolation result because it has the smallest standard deviation value. The results showed that the effect of the Borneo Vortex event on rainy days was more evenly distributed for the West Kalimantan region with moderate criteria as many as 117 sub-districts or 66.9%, while the influence on rainfall with low, medium, and high criteria was 73.7%, 22.9%, and 3.4%, respectively. The high criterion is more dominant in the northern and southern regions of West Kalimantan. The highest frequency of Borneo Vortex occurred in December at 32.6%.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	analisis spasial, Borneo Vortex, hujan Borneo Vortex, rain, spatial analysis
Subjects:	G Geography. Anthropology. Recreation > G Geography (General) > G70.212 ArcGIS. Geographic information systems. G Geography. Anthropology. Recreation > GB Physical geography > GB1399.2 Flood forecasting.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geomatics Engineering > 29101-(S2) Master Thesis
Depositing User:	Sudiar .
Date Deposited:	18 Jun 2025 09:44
Last Modified:	18 Jun 2025 09:44
URI:	http://repository.its.ac.id/id/eprint/119210

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