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Andi Ihwan
Program Studi Geofisika, Universitas Tanjungpura
Agriculture, Biological Sciences & Forestry Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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Kajian Dinamika Bibit Siklon Tropis 98S di Perairan Kalimantan Barat Menggunakan Model WRF-ARW (Studi Kasus 5 Maret 2023) Ihwan, Andi; Christy, Maria Citra Puella; Ardianto, Randy; Fitriyawita, Mega
POSITRON Vol 15, No 1 (2025): Vol. 15 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v15i1.72188

Abstract

Fenomena bibit siklon tropis 98S yang muncul di perairan Kalimantan Barat pada 5 Maret 2023 pukul 00.00 UTC merupakan suatu anomali, karena terbentuk di wilayah dengan lintang 5 °LU hingga 3 °LS dan bujur 104 °BT hingga 114 °BT, yaitu di perairan sekitar Kalimantan Barat. Tujuan penelitian ini adalah untuk melakukan simulasi kondisi cuaca di perairan Kalimantan Barat saat terjadinya bibit siklon tropis 98S pada tanggal 4 hingga 5 Maret 2023. Simulasi kondisi cuaca dalam penelitian ini menggunakan model Weather Research and Forecasting (WRF-ARW). Data yang digunakan meliputi data NCEP FNL sebagai data input model, data temperature brightness dari satelit Himawari 9-IR, dan data streamline angin dari ERA5. Parameter cuaca yang dikaji terdiri dari streamline dan kecepatan angin, vortisitas relatif, tekanan permukaan, kelembapan relatif, curah hujan, serta indeks stabilitas atmosfer. Hasil penelitian menunjukkan bahwa model secara umum mampu menyimulasikan bibit siklon tropis 98S. Teramati bahwa kondisi cuaca di perairan sekitar 0,4 °LS dan 108,4 °BT mendukung terjadinya bibit siklon tersebut, ditandai dengan terbentuknya pusat tekanan rendah, suhu permukaan laut yang tinggi, kelembapan relatif yang mencapai 90%-100%, serta adanya pusaran angin di wilayah kajian dengan vortisitas relatif yang sangat kuat pada lapisan 950 mb hingga 850 mb. Selain itu, kondisi atmosfer yang labil berpotensi mendorong pembentukan awan konvektif. Dampak dari kejadian bibit siklon ini adalah peningkatan curah hujan di perairan dan daratan Kalimantan bagian Barat, terutama setelah kejadian tersebut.
Enhancing high school students’ understanding and skills in geophysical surveying and data processing: A service learning Jumarang, Muhammad Ishak; Putra, Yoga Satria; Muliadi, Muliadi; Ihwan, Andi; Sampurno, Joko; Faryuni, Irfana Diah; Zulfian, Zulfian; Adriat, Riza; Perdana, Radhitya; Muhardi, Muhardi
Community Empowerment Vol 10 No 6 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.12716

Abstract

Knowledge and skills in geophysical surveying and data processing are unique areas for high school students interested in environmental conditions. This community engagement activity aimed to enhance the understanding and skills of high school students in Pontianak City regarding geophysical surveying and data processing through direct field observations. The activity spanned five months, from June to October 2024, and included several stages: preparation, implementation, and evaluation. Evaluation was conducted with 41 participants, achieving a success index of 90.54%. These evaluation results indicate that the activity met the expectations of most participants. Key aspects such as participant satisfaction, program utility, material comprehension, presenter/facilitator delivery, and time allocation received very high appreciation from the participants.
TRANSFORMASI LIMBAH TUTUP BOTOL PLASTIK MENJADI TAS KREATIF UNTUK KEMANDIRIAN EKONOMI DAN PELESTARIAN LINGKUNGAN Fadhilah, Raudhatul; Utami, Putri Yuli; Kurniasari, Fita; Masriani, Masriani; Ihwan, Andi; Jumarang, Ishak; Tiara, Tiara; Herniawati, Herniawati; Tari, Sultra; Gibran, Muhammad; Maftuh, Irfan
Jurnal Abdi Insani Vol 12 No 4 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i4.2372

Abstract

Desa Sungai Rasau faces issues with plastic waste accumulation, particularly bottle cap waste, which poses environmental risks due to its non-biodegradable nature. The Kosabangsa Program was initiated as a solution to address this problem while also fostering entrepreneurial skills among students at Madrasah Ibtidaiyah Swasta Nahdhotul Athfal. Through a cross-sectoral collaborative approach, the program involves universities, schools, and the local community in transforming plastic bottle cap waste into creative bags. The applied methods include training, hands-on product creation, and marketing guidance. The results demonstrate a significant skill improvement, with 75% of participants able to independently create the bags and 90% reporting enriched learning experiences due to the collaboration. This program has the potential to serve as a sustainable model that integrates education, economic empowerment, and environmental awareness among students.
Analisis Sebaran Polusi Udara di Kota Pontianak menggunakan Model WRF-Chem (Studi Kasus Kebakaran Hutan 21-25 Agustus 2018) Sari, Deby Kartika; Ihwan, Andi; Ardianto, Randy
Jurnal Sains dan Edukasi Sains Vol. 8 No. 2 (2025): Jurnal Sains dan Edukasi Sains
Publisher : Faculty of Science and Mathematics, Universitas Kristen Satya Wacana, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/juses.v8i2p99-107

Abstract

Kebakaran hutan merupakan salah satu ancaman serius yang berdampak luas terhadap kerusakan ekosistem, pencemaran udara, serta membahayakan kesehatan masyarakat. Salah satu kejadian kebakaran hutan yang signifikan terjadi di wilayah sekitar Kota Pontianak pada bulan Agustus 2018. Peristiwa ini menyebabkan penurunan kualitas udara secara drastis dan memicu munculnya kabut asap tebal yang menyelimuti kota. Penelitian ini bertujuan untuk mengkaji pola distribusi polutan udara selama kejadian kebakaran hutan tersebut. Metode yang digunakan dalam penelitian ini adalah model Weather Research and Forecasting with Chemistry (WRF-Chem), yang memungkinkan simulasi sebaran polutan secara spasial dan temporal. Hasil simulasi menunjukkan bahwa model WRF-Chem cukup efektif dalam merepresentasikan distribusi polutan udara di wilayah Kota Pontianak dan sekitarnya. Pola distribusi polutan menunjukkan peningkatan konsentrasi yang signifikan pada malam hingga pagi hari, yang dikaitkan dengan suhu udara yang relatif rendah dan dominasi angin dari arah tenggara dengan kecepatan rata-rata 9 m/s. Sebaliknya, pada siang hari, suhu yang tinggi dengan rata-rata mencapai 34 °C berkontribusi terhadap penurunan konsentrasi partikel polutan (particulate matter) karena proses pengangkatan partikel ke lapisan atmosfer yang lebih tinggi. Namun demikian, kondisi suhu tinggi pada siang hari justru menyebabkan peningkatan konsentrasi gas nitrogen dioksida yang menyebar ke wilayah yang lebih luas. Temuan ini menunjukkan adanya keterkaitan antara parameter meteorologi dan distribusi polusi udara, yang dapat dijadikan dasar dalam perumusan strategi mitigasi terhadap dampak kebakaran hutan dan lahan di masa mendatang.
Analysis of Pollutant Distribution Due to Forest Fires in Ketapang Regency in 2015 Using The WRF-Chem Model Yani, Elyda; Ihwan, Andi; Ardianto, Randy; Adriat, Riza; Jumarang, Muhammad Ishak
JURNAL GEOCELEBES Vol. 9 No. 2: October 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i2.42903

Abstract

A forest fire occurred on September 9, 2015, resulting in 616 hotspots distributed across several regencies in West Kalimantan, 442 of which were in Ketapang Regency. This study aims to analyze the spatial and temporal distribution of pollutants caused by forest fires in Ketapang Regency in 2015 using the Weather Research and Forecasting with Chemistry (WRF-Chem) model. The data used to run the model includes the Final Global Data Assimilation System (FNL) dataset, the Emission Database for Global Atmospheric Research (EDGAR), and The Fire Inventory from NCAR (FINN), which serve as input and emission source data. The highest concentrations of pollutants, which are PM2.5 and PM10 at 30 µg/m³ each and CO at 342.9 µg/m³, were observed in the southern part of Kalimantan, which is the main source of the forest fires. These pollutants subsequently dispersed toward the northern part of Kalimantan. During the fire events, pollutants were transported to the upper atmosphere from morning to noon but accumulated near the surface at night. This pattern was influenced by meteorological conditions, including wind speed and direction, surface pressure, and air temperature. During forest fires, pollutants are emitted into the atmosphere from morning to afternoon, and accumulate near the surface during the night. This pattern was influenced by meteorological factors, including wind speed and direction, surface pressure, and air temperature.
Analisis Dinamika Atmosfer Saat Hujan Lebat di Wilayah Pontianak Menggunakan Model WRF-ARW (Studi Kasus 22-23 Desember 2022) Ihwan, Andi; Mabriyah, Minuk Hidayatul; Ardianto, Randy
Jurnal Teknik Sipil Vol 32 No 2 (2025): Jurnal Teknik Sipil - Edisi Agustus
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2025.32.2.3

Abstract

Abstract West Kalimantan has a tropical rainforest climate characterized by high rainfall intensity. On December 22–23, 2022, heavy rainfall occurred in Pontianak City with an intensity reaching 101.3 mm/day, resulting in flooding in the area. This study analyzes weather conditions and atmospheric stability during the event using the WRF-ARW model with FNL data as model input, along with GSMaP data and observations of air temperature and surface pressure for verification. Model accuracy was evaluated using dichotomous equations (Accuracy, FAR, POFD), correlation coefficient, and Mean Absolute Error (MAE). The verification results indicate that the GD scheme performed better than the KF Kessler and KF Lin schemes, with the GD scheme achieving an accuracy value of 0.74 and lower error. Analysis using the GD scheme suggests atmospheric conditions conducive to the formation of convective clouds that caused the heavy rainfall. These conditions were marked by an unstable atmosphere with a maximum temperature of 30°C before the rain, low surface pressure, high wind speeds in the waters west of Pontianak City, humidity reaching 100%, and CAPE values indicating moderate instability (2000 J/kg). Keywords: Heavy rain, cumulus parameterization scheme, WRF-ARW  
Drought Analysis in Ketapang District using the Keetch-Byram Drought Index Method Massuro, Lusyndatul; Adriat, Riza; Muliadi, Muliadi; Ihwan, Andi; Sutanto, Yuris
JURNAL GEOCELEBES Vol. 8 No. 2: October 2024
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v8i2.36474

Abstract

Ketapang Regency is one of the areas in West Kalimantan that is prone to drought. Drought can trigger forest and land fires. In this research, the Keetch-Byram Drought Index (KBDI) method was used to determine the level of drought in Ketapang Regency. The KBDI method relies on annual rainfall accumulation, daily rainfall, and maximum air temperature. The KBDI values obtained were correlated with the number of hotspots using Pearson correlation. This research was conducted throughout 2018-2022. Based on the monthly average KBDI value, the highest drought in Ketapang Regency occurred in August and September, while the lowest drought occurred in December and January. In terms of the annual average, the highest drought occurred in 2019. During the ENSO phenomenon in 2019, the El Niño phase experienced higher drought than the La Niña phase and normal years. In the El Niño phase, drought levels reach high to extreme categories. The correlation value between annual KBDI and the number of hotspots is 0.88, indicating a solid relationship. An increase in the KBDI value will be followed by an increasing number of hotspots.
Analisis Indeks Stabilitas Atmosfer Pada Saat Kejadian Thunderstorm disertai Hujan di Stasiun Meteorogi Supadio Oktapiana, Teresia; Ihwan, Andi; Adriat, Riza; Fitrianto, Taufik Nur
PRISMA FISIKA Vol 13, No 3 (2025): PRISMA FISIKA, Vol. 13, No. 03 (2025)
Publisher : FMIPA, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/pf.v13i3.75086

Abstract

Analisis indeks stabilitas atmosfer pada saat kejadian thunderstorm disertai hujan telah dilakukan di stasiun meteorologi Supadio di tahun 2022. Indeks yang dikaji adalah Severe Weather Threat Index (SWEAT), Showalter Index (SI), dan K-Index (KI) yang diperoleh dari keluaran perangkat lunak Rawinsonde Observation Program (RAOB).  Hasil analisis menunjukan bahwa puncak kejadian thunderstorm disertai hujan di stasiun meteorologi Supadio pada musim kering yaitu bulan Juni, Juli, Agustus (JJA). Ketiga indeks stabilitas yaitu SWEAT (89,29%), SI (100%), dan KI (67,86%) menunjukan dominan berkategori moderat.
Analisis Urban Heat Island (UHI) Di Kota Singkawang, Kalimantan Barat Nathasya, Risma; Ihwan, Andi; Adriat, Riza
PRISMA FISIKA Vol 13, No 3 (2025): PRISMA FISIKA, Vol. 13, No. 03 (2025)
Publisher : FMIPA, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/pf.v13i3.75507

Abstract

Kota Singkawang merupakan salah satu kota di Provinsi Kalimantan Barat yang memiliki luas wilayah sebesar 504,00 km2 atau sekitar 0,34 % dari luas wilayah Kalimantan Barat dan jumlah penduduknya 241.467 jiwa dengan kepadatan penduduk 479 jiwa/km2. Dengan jumlah penduduk yang banyak dan terus meningkat, dapat memberikan pengaruh besar terhadap perubahan luas permukiman dan juga akan mempengaruhi suhu udara yang dapat memicu terjadinya fenomena Urban Heat Island (UHI). Penelitian ini menggunakan citra penginderaan jauh Moderate Resolution Imaging Spectroradiometer (MODIS) untuk menganalisis fenomena UHI yang terjadi di wilayah Kota Singkawang. Hasil penelitian ini menunjukkan Kota Singkawang pada tahun 2001 didominasi LST (28-30 ℃) dalam suhu udara hangat dan tahun 2022 didominasi LST (30-32℃). Kota Singkawang telah terdampak fenomena UHI dimana pada tahun 2001 Kota Singkawang yang terindikasi UHI dengan luas sebesar 94,83 km2 dan nilai maksimum UHI 2℃, tahun 2022 luas wilayah sebaran UHI sebesar 253,12 km2 dengan nilai maksimum mencapai 3℃. Kota Singkawang pada tahun 2001 didominasi suhu permukaan kelas 3 sedangkan tahun 2022 Kota Singkawang didominasi suhu permukaan kelas 4. Perubahan UHI yang terjadi dari tahun 2001-2022 di Kota Singkawang yaitu adanya peningkatan luas sebaran wilayah yang terindikasi UHI sebesar 158,28 %, dan nilai intensitas UHI yang pada tahun 2001 hanya terdapat 3 kelas sedangkan pada tahun 2022 ada 4 kelas.
Analysis of Extreme Weather in the Waters of West Kalimantan using the WRF-ARW Model (Case Study 13-14 July 2021) Juliana, Tarisya; Adriat, Riza; Ardianto, Randy; Ihwan, Andi; Sutanto, Yuris
JURNAL GEOCELEBES Vol. 10 No. 1: April 2026
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v10i1.43141

Abstract

On 13 July 2021, there was an extreme weather phenomenon in the waters of West Kalimantan. The extreme weather resulted in several fishing boats sinking and causing 136 casualties. This study aims to analyze atmospheric conditions during extreme weather on July 13-14, 2021. In running the WRF-ARW model, verification is carried out using the dichotomy method (Accuracy, POD, FAR) and RMSE to determine the model's accuracy in simulating extreme weather events. The RMSE verification results show an error value of 4,97. The results of the WRF-ARW model output show that the extreme weather that occurs is caused by the presence of a convergence wind zone with a maximum wind speed of 18 m/s, causing the formation of cumulonimbus clouds. OLR simulations show a low value of 122 watts/m², indicating a lot of cloud cover with the potential for rain. The emergence of this convection zone causes strong winds, which cause high waves, thus contributing to ship accidents.
Co-Authors . Apriansyah . Kornellius . Nurfarahin . Renitania . Retnawati Achmadi Achmadi Ade Elbani Ade Mirza Adlina, Zora Ulva Afrizal - Agustina Listiawati Aktris Nuryanti, Aktris Alhadiansyah Ardianto, Randy Arnida Lailatul Latifah Asep Nursangaji Asifa Asri Aswandi - Atang Rahma Agusta Bistari Boni Pahlanop Lapanporo Budiman Budiman Christy, Maria Citra Puella Dwi Zulfita Dwiria Wahyuni Edy Suasono Elly Suharlina Erni Djun Astuti Eva Dolorosa Fadhilah, Raudhatul Fanni Aditya Fernanda, Anastasia Gracia Firmansyah Sirait, Firmansyah Fita Kurniasari Fitri Imansyah Fitrianto, Taufik Nur Fitriyawita, Mega Fronika, Yohana Gibran, Muhammad Godja, Balduyanus Yosep Hadary, Ferry Hamdani - Herkulana Ferdianti Aprianti Herniawati Herniawati Herniawati, Herniawati Herry Sujaini Hidayat Pawitan Hutabarat, Victor Ibrahim Sota Ibrahim Sota Iis Solehati Imam Ghozali Iman Hakiki, Iman Irfan Maftuh Irfana Diah Faryuni Ismawartati - Joko Sampurno Joko Sampurno Juliana, Tarisya Jumarang, Ishak Jumarang, Muh Ishak M. Yogi Riyantama Isjoni Mabriyah, Minuk Hidayatul Maftuh, Irfan Masriani . Massuro, Lusyndatul Meiran Panggabean Memet Agustiar Miftahuddin, . Mochammad Meddy Danial Muanuddin - Muh. Ishak Jumarang Muh. Ishak Jumarang Muh. Taufik Muhammad Elifant Yuggotomo Muhammad Gibran Muhammad Luthfi Muhammad Yusuf Muhardi Muhsin Muhsin Muliadi Muliadi Muliadi Muliadi Nathasya, Risma Nia Daniati Niken Ayu Oktaviani Ningsih, Kurnia Norsiah, Norsiah Novi Suryanti Novia Anggraini Nurhasanah Nurhasanah Nurhasanah Nurhasanah Nurmainah - Nurul Kusuma Wardhani Oktapiana, Teresia Oktavia, Vivi Perdana, Radhitya Perdhana, Radhitya Priyo Saptomo Purba Santoso, Purba Purwaningsih - Purwoko, Agus Putri Yuli Utami Rachmawati Rahmat Hidayat Rahmidiyani - Ratna Herawatiningsih Riduansyah - Rika Katulistiyani Riza Adriat Rommy Patra Sari, Deby Kartika Satria Putra, Yoga Serafi Yana Setia Budi Sholva, Yus Silvia Uslianti Siti Hadijah Siti Halidjah Stepanus Sahala Sitompul Sultra Tari Surachman - Susi Susanti Sy. Hasyim Azizurrahman Syaifurrahman Syaifurrahman Syamswisna , Tari, Sultra Tia Nuraya Tiara Tiara Tiara, Tiara Tsabita, Tyas Khansa Tyas Khansa Tsabita Uti Asikin Vivi Bachtiar Wendy Windhu Putra Witarsa - Yani, Elyda Yoga Satria Putra Yohanes Gatot Sutapa Yudha Arman Yuline - Yulis Jamiah Yuris Sutanto Zubaidah R Zulfian Zulfian