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Analysis of Rainfall Distribution and Climate Classification in Response to Flood Events in Lebong Regency, Indonesia Limbong, Rospita Naomi; Anwar, Anang; Johan, Septi; Lizalidiawati, Lizalidiawati
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 11 No 1 (2025): January-June
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v11i1.8740

Abstract

This study aims to analyze the distribution and time series of rainfall in Lebong Regency, using a case study of the flood event on April 16, 2024, and to analyze the condition of climate change in Lebong Regency from 2014 to 2024. This research uses daily rainfall data to examine flood events and monthly data over 11 years from 2014 to 2024 for climate classification analysis with 10 rainfall observation stations using the Schmidt-Ferguson method. The results of the data processing were analyzed using descriptive and quantitative methods. Based on the research results, it was found that the distribution of rainfall before, during, and after the flood event experienced a significant change. Before the incident, the lowest rainfall in Lebong Regency was recorded at the Bungin, Gunung Alam, Rimbo Pengadang, and Semelako Atas Stations with a value of 0 mm/day (no rain). Rainfall increased on the day of the flood in several sub-districts, with the highest recorded at the Lemeu Station in Uram Jaya sub-district, reaching 101 mm/day. Meanwhile, after the day of the flood, the rainfall was 12 mm/day. Meanwhile, the climate classification based on the Schmidt-Ferguson method shows that the rainfall in Lebong Regency falls into the wet to very wet climate category. The very wet climate category in Lebong Regency is represented by the Bungin station, with rainfall amounting to 1166 mm/month in January 2020. Based on the 11-year average data, the highest rainfall occurs in November, amounting to 537.58 mm/year. The study also contributes to understanding local flood risk based on long-term rainfall classification, which has rarely been explored in the Bengkulu region.
Perubahan Muka Air Laut dan Klorofil-A di Perairan Bengkulu Akibat Kejadian Enso Irkohs, Irkhos; Ulandari, Tresi Pitria; Irkhos, Irkhos; Lizalidiawati, Lizalidiawati
Akuatiklestari Vol 8 No 2 (2025): Jurnal Akuatiklestari
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Ilmu Kelautan dan Perikanan, Universitas Maritim Raja Ali Haji

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31629/akuatiklestari.v8i2.7158

Abstract

Perairan Bengkulu merupakan salah satu perairan yang dipengaruhi oleh fenomena El-Niño Southern Oscillation (ENSO) sehingga memengaruhi perubahan muka air laut di wilayah Bengkulu. Penelitian ini bertujuan unutk menganalisis hubungan antara kejadian El-Niño dan La-Niña Terhadap perubahan muka air laut serta distribusi klorofil-a si Perairan Bengkulu. Data yang dianalisis mencakup SLA, klorofil-a, serta indeks Nino 3.4 dalam rentang waktu 20 tahun (2002–2022), yang diperoleh dari satelit altimetri multi-misi dan NOAA. Proses analisis dilakukan menggunakan perangkat lunak Panoply, SeaDAS, dan Excel, serta uji korelasi dan regresi linear dengan Matlab R2024b. Hasil Penelitian menunjukkan adanya korelasi linear negatif antara Indeks ENSO dan SLA (r = -0,12), serta korelasi linear positif antara Indeks ENSO dan klorofil-a (r = 0,13). Saat terjadi El-Niño, SLA mengalami penurunan (-0,1 hingga 0,1 m), sementara konsentrasi klorofil-a meningkat (-0,3hingga 0,4 mg/m³) akibat proses upwelling mengalami penguatan yang membawa nutrisi dari perairan dalam ke permukaan. Sebaliknya saat La Niña terjadi, SLA cenderung meningkat sebesar 0,1 hingga 0,12 m, sedangkan klorofil-a mengalami penurunan sebesar 0,2 hingga 0,5 mg/m³ akibat adanya proses downwelling. Namun, selama periode La-Niña 2007–2009, ditemukan anomali dimana SLA mengalami penurunan, sementara klorofil-a meningkat. Hal ini diduga disebabkan oleh upwelling lokal yang dipengaruhi oleh fenomena Indian Ocean Dipole (IOD positif). Penelitian ini menunjukkan bahwa ENSO memiliki dampak signifikan terhadap dinamika oseanografi di perairan Bengkulu. Penelitian ini dapat dijadikan informasi awal khususnya bagi nelayan dan masyarakat sekitar pesisir dalam adaptasi dampak perubahan lingkungan laut akibat kejadian ENSO.
Sea Level Anomaly Variability Due to Global Climate in the Western Waters of Sumatra Banjarnahor, Samuel Kristian Alfredo; Silaban, Angeli; Verojenases, Fascal; Irkhos, Irkhos; Lizalidiawati, Lizalidiawati
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.534

Abstract

The western waters of Sumatra are part of the Indonesian waters that directly interact with the Indian Ocean, which is a climatologically complex area due to influenced by various atmospheric and marine phenomena that are seasonal and inter annual. Therefore, the purpose of this study is to analyze the influence of the El Niño Southern Oscillation (ENSO) phenomenon on changes in sea level in Western Sumatra waters during the period of 1997-2023. The data used include sea level anomaly (SLA), Oceanic Niño Index (ONI), and Dipole Mode Index (DMI). The results show that strong El Niño, such as in 1997/1998, cause sea level to drop to - 0.3 meters due to intense upwelling. In contrast, El Niño 2015/2016 increased sea level by + 0.2 meters due to the dominance of down welling. During the La Niña period, sea level rose significantly, reaching 0.3 meters in 2022/23. The long-term trend shows an average sea level rise of 0.056-0.064 meters over the last 26 years, with different variations between regions.
Identification of Seawater Quality Around PLTU Teluk Sepang Outlet Based on Oceanographic Parameters Gerry, Muamar; Silaban, Angeli; Johan, Septi; Lidiawati, Liza
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 69 No 2 (2025): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36842/jomase.v69i2.533

Abstract

The heat waste produced by the PLTU is released directly into the ocean, significantly impacting the quality of sea water. This research intends to assess the quality of sea water near the PLTU Teluk Sepang outlet in Bengkulu City using oceanographic parameters. Data collection was conducted in the field at eight sites that represent the area around the PLTU outlet, focusing on parameters such as sea water temperature, salinity, density, pH, and ocean currents. The obtained measurement results were then compared against the standards set by KepMenLH No. 51, 2004. The findings reveal that parameters such as temperature, pH, and salinity did not meet the quality standards necessary for marine biota ecosystems; the average temperature ranges from 33.58 to 35.39 °C, the pH levels were between 8.59 and 8.76, indicating an alkaline condition, and salinity measures between 24.7 and 26.9 ‰, all of which fall below the standards established by KepMenLH No. 51, 2004. This research demonstrates that the discharge of heat waste substantially pollutes the sea water quality around the PLTU Teluk Sepang outlet in Bengkulu City, particularly affecting sea water temperature, which significantly influences the metabolism of marine biota.
The Influence of Monsoon Winds on Humidity, Cloud Cover, and Rainfall in Bengkulu City Warahma, Ella; Lizalidiawati, Lizalidiawati; Irkhos, Irkhos; Herawati, Tuti
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 11 No 1a (2025): Special Issue
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v11i1a.8811

Abstract

The city of Bengkulu, which borders the Indian Ocean, has unique weather and climate. The ENSO phenomenon in 2023 will also strengthen the impact of monsoon winds on weather parameters in Bengkulu City. This research aims to analyze the influence of monsoon winds on air humidity, cloud cover and rainfall in Bengkulu City during 2022-2024. Data including wind speed and direction, humidity, cloud cover, and rainfall, were analyzed using WRPLOT View, ArcGIS, Panoply, and Excel software. The method used is descriptive, quantitative and statistical analysis. The results show that during the Northwest Monsoon (January 2022–2024), the dominant winds are from the northwest and northeast with cloud cover (80%) and the highest rainfall is 449 mm/month and the lowest is 208 mm/month. In Transition Monsoon I (April 2022–2024), the wind direction is from the northwest, the highest humidity is 94%, cloud cover (75%) and rainfall is medium to high. In the Southeast Season (August 2022), the wind direction varies greatly with the highest (95%) and lowest (77%) air humidity and the highest rainfall of 558 mm/month. Meanwhile, August and October 2023 will see a decrease in rainfall, where the rainfall will be 10 – 84 mm/month due to the El Niño phenomenon. Transition Season II (October 2022 and 2024) the wind direction varies greatly, namely from the southeast, northwest and north, rainfall varies from low to high. The highest correlation coefficient for rainfall with humidity was 0.45 at the Bengkulu Climatology Station and the lowest was 0.22 at the Bengkulu University Station. The highest correlation with cloud cover was 0.67 at Tanjung Agung Station and the lowest was 0.53 at Bengkulu Climatology Station. This study reveals that the northwest monsoon contributes to high humidity and rainfall, and El Niño will reduce rainfall significantly in 2023. These results indicate that monitoring seasonal winds is very important for predicting hydrometeorological disasters in Bengkulu City.
Analisis Pengaruh Tekanan Udara, Kelembaban, dan Suhu Udara terhadap Curah Hujan di Kota Bengkulu selama El Niño 2023 Wahyuni, Ani Sri; Edkayasa, Mardho Tillah; Johan, Septi; Norfahmi, Siti Hairunnisa; Lizalidiawati, Lizalidiawati
Jurnal Kelautan Vol 18, No 2: Agustus (2025)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v18i2.29965

Abstract

ABSTRAKFenomena El Niño sangat memengaruhi dinamika atmosfer, meliputi variabel seperti tekanan udara, kelembaban, dan suhu, sehingga memengaruhi pola presipitasi di Kota Bengkulu. Penelitian ini bertujuan untuk mengetahui hubungan antara tekanan udara, kelembaban udara, dan suhu udara terhadap pola curah hujan dari tahun 2019 hingga 2023, dengan fokus pada fenomena El Niño yang terjadi pada tahun 2023. Data diperoleh dari Stasiun Klimatologi Bengkulu dan Stasiun Meteorologi Fatmawati Soekarno, serta data Oceanic Niño Index (ONI) dari NOAA. Penelitian ini menggunakan metodologi deskriptif dan analisis regresi linier berganda, yang dilakukan dengan menggunakan Microsoft Excel. Hasil penelitian menunjukkan bahwa terdapat korelasi yang signifikan antara suhu udara, tekanan udara, dan kelembaban udara di Stasiun Klimatologi, dengan koefisien korelasi sebesar 0,54. Sebaliknya, parameter cuaca di Stasiun Meteorologi memiliki koefisien korelasi yang lebih rendah, yaitu 0,42. Hasil ini menyatakan bahwa adanya varians dalam hubungan antara variabel meteorologi tersebut di berbagai lokasi pengamatan. Hal ini mengonfirmasi bahwa El Niño menyebabkan penurunan curah hujan akibat meningkatnya suhu dan tekanan udara, serta berkurangnya kelembaban. Penelitian ini berpotensi menyediakan kerangka dasar untuk mengurangi dampak buruk kekeringan akibat perubahan iklim di wilayah Kota Bengkulu.Kata Kunci : Suhu Udara, Kelembaban, Tekanan, Curah Hujan, El Nino.ABSTRACTThe El Niño phenomenon significantly influences atmospheric dynamics, including factors like as air pressure, humidity, and temperature, hence impacting precipitation patterns in Bengkulu City. This study seeks to ascertain the correlation between air pressure, humidity, and temperature concerning rainfall patterns from 2019 to 2023, emphasising the El Niño phenomena of 2023. Data were acquired from the Bengkulu Climatology Station, the Fatmawati Soekarno Meteorology Station, and the Oceanic Niño Index (ONI) data provided by NOAA. This research employed a descriptive methodology and multiple linear regression analysis conducted via Microsoft Excel. The findings indicated a substantial association among air temperature, air pressure, and air humidity at the Climatology Station, with a correlation coefficient of 0.54. The Meteorology Station exhibited a lower correlation coefficient of 0.42 for the identical parameters. The results demonstrate variability in the correlation among these meteorological variables across different observation sites. The results indicate that El Niño leads to less precipitation owing to elevated temperature and air pressure, together with diminished humidity. This research may establish a foundational paradigm for alleviating the detrimental effects of climate change-induced droughts in coastal regions.Keywords: Air Temperature, Humidity, Pressure, Rainfall, El Nino.