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Sukarasa, I Ketut
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Analysis of Leachate of Soil Water Pollution Using Geo-electrical Methods in Final Processing Place (TPA) Regional Sarbagita Ni Kadek Sugestiani; I Ketut Sukarasa; I Ketut Putra
BULETIN FISIKA Vol 19 No 2 (2018): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

A research about analysis of leachate of soil water pollution using geo-electrical methods in final processing place (TPA) regional sarbagita has been conducted. The measurements were made on 4 tracks by using a Naniura NDR 300HF resistivity meter. The results show on track 1 and track 2 indicate there is a leachate with a resistivity value ranging from 2.67 to 5.74 ?m and 3.15 to 9.19 ?m respectively, on track 3 indicate that the distribution of leachate has decreased compared to paths 1 and 2, on the 3 leachate path there are only certain points with resistivity values ranging from 6.57 to 9.66 ?m. Measurement results on track 4 the resistivity is greater than 10 ?m, this indicates that on track 4 there is no leachate pollution. The results of the analysis of well water samples which are located right on tracks indicating the content of BOD (biochemical oxygen demand), COD (chemical oxygen demand), Cyanide (CN), Lead (Pb), E. coli and coliform which exceeded the quality standard limits.
The Correlation of Southern Oscillation Index (SOI) with the Rainfall at Rainy and Dry Season Peak in Kintamani-Bangli Region period 1986-2015 Wayan Mita Restitiasih; I Ketut Sukarasa; I Wayan Andi Yuda
BULETIN FISIKA Vol 20 No 2 (2019): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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A correlation study of the Southern Oscillation Index (SOI) on rainfall at the peak of the wet and dry season in the Kintamani-Bangli region has been carried out by taking SOI values and rainfall data for the period 1986-2015. The rainfall data used were recorded at 2 rain posts, namely Kembangsari and Kintamani. The research aimed to determine the relationship of fluctuations in the value of SOI with the intensity of rainfall, so that it can be used as a regional management plan when El Nino occurs. The method used in this study is correlation. The results obtained from the correlation that is the relationship between SOI value and rainfall in February were quite strong in the Kembangsari post with correlation coefficient of 0.409. Whereas for the Kintamani post the correlation obtained was weak with a correlation coefficient of 0.308. Then in August a weak correlation occurred in the Kembangsari post with a correlation coefficient of 0.2398 and was quite strong in the Kintamani post with a correlation coefficient of 0.4662. So that the influence of El Nino in the Kintamani area in February was more dominant in the Kembangsari post and in August at the Kintamani post.
PENGARUH ENSO TERHADAP VARIABILITAS IKLIM DI SULAWESI DENGAN MENGGUNAKAN METODE TRANSFORMASI WAVELET Ni Luh Gede Desy Suryaningsih; I Ketut Sukarasa; Ida Bagus Alit Paramarta; I Gede Hendrawan
BULETIN FISIKA Vol 14 No 1 (2013): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Research on the influence of El-Nino Southern Oscillation (ENSO) on climate variability in Sulawesi has been down using wavelet transform method. The data used in this research is the data from 2003 to 2011 which include data SST from satellite Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) level 3, rainfall data from satellite Tropical Rainfall Measuring Mission (TRMM), and data Sea Level Pressure (SLP) from Climate Prediction Centre (CPC). The data were analyzed using Fourier transform to see the high period of the anomaly SPL Nino 3.4, SOI and Sulawesi rainfall anomalies. The data also analysis using wavelet transform. From the result of wavelet transform it for obtained that the power spectrum (ps) that used to find correlation between ps ENSO indicators for ps Sulawesi rainfall anomalies. Based on the results of the research, the ENSO phenomenon is impact of climate variability in the form of heavy Sulawesi rainfall in 2010. The results of the correlation ps SST anomaly Nino 3.4 to ps Sulawesi rainfall anomalies occur significant positive correlation in the period from 1.5 to 1.6 years and 2.2 to 4.5 years, while the correlation of the ps SOI ps Sulawesi rainfall anomalies occur positive correlation significantly in the period from 1.5 to 1.6 years and 2.2 to 4.6 years.
Earthquake Hypocenter Relocation in The Abang-Culik Fault, Karangasem using Coupled Velocity-Hypocenter Method Made Prama Yudistira; I Ketut Sukarasa; I Made Kris Adi Astra
BULETIN FISIKA Vol 24 No 1 (2023): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2023.v24.i01.p03

Abstract

Research has been done about the relocation of earthquake hypocenter position, seismic wave local velocity and correction of seismic wave recording station at the Abang-Culik Fault area according to coordinate 115,25°-115,75° BT and 8,00°-8,60° LS. Data which was used on this research was the earthquake data that occur in the 2015-2020 period. The research was conducted using the coupled velocity-hypocenter method. From the relocation result, the position of the earthquake hypocenter shifted, which initially spread to become more concentrated in the fault plane area. The local velocity decreasing a lot in the 3rd layer which was influenced by the presence of the Mount Agung magma pocket in that area. The correction of Station shown that only 1 station has a negative value of delay time, namely IGBI station while the other 13 stations show a positive value of delay time. Abstrak Telah dilakukan penelitian tentang relokasi posisi hiposenter gempabumi, model kecepatan lokal gelombang seismik dan koreksi stasiun pencatat gelombang seismik di daerah Sesar Abang-Culik dan sekitarnya koordinat 115,25°-115,75° BT dan 8,00°-8,60° LS. Data yang digunakan merupakan data kejadian gempabumi pada periode 2015-2020. Penelitian dilakukan dengan menggunakan metode coupled velocity-hypocenter. Dari hasil relokasi diperoleh, posisi hiposenter gempabumi mengalami pergeseran, yang awalnya menyebar menjadi lebih terpusat di daerah bidang sesarnya. Kecepatan lokal mengalami penurunan yang signifikan pada lapisan ke-3 yang dipengaruhi oleh adanya kantung magma Gunung Agung di daerah penelitian. Hasil koreksi stasiun menunjukkan hanya 1 stasiun yang memiliki nilai delay time bertanda negatif yaitu stasiun IGBI sedangkan 13 stasiun lainnya menunjukkan nilai delay time bertanda positif.
MENENTUKAN VARIABILITAS SPASIAL ALBEDOPADA WILAYAH BALI MENGGUNAKAN DATA SATELIT MODIS BRDF MCD43A1 TAHUN 2005 - 2012 Ni Wayan Meri Monika Sari; I Ketut Sukarasa; I Gede Hendrawan
BULETIN FISIKA Vol 16 No 1 (2015): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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A research has been conducted to determine the variability of the albedo in Bali using MODIS BRDF MCD43A1 satellite data started from 2005 until 2012. The data used in this study is MODIS BRDF MCD43A1 data and MODIS Aerosol Optical Depth data. From MODIS BRDF MCD43A1 data, black sky and white sky albedo were calculated. The results of black sky and white sky albedo combined together and with MODISAerosol Optical Depth data to find the blue sky albedo (actual albedo), then monthly average of blue sky albedoused todetermine the spatial albedo variability in Bali. Spatial annual variability of actual albedo in Bali during 2005 – 2012 reached the highest peak in 2008 and lowest in 2010. Monthly average of actual albedo started from September-October while the lowest is in January - February. Keywords: Albedo, MODIS BRDF MCD43A1, MODIS Aerosol Optical Depth, Black Sky albedo, White Sky Albedo, Blue Sky Albedo (Actual Albedo)
Pemetaan Tingkat Bahaya Bencana Gempabumi Di Wilayah Banyuwangi Berdasarkan Percepatan Tanah Maksimum Muhamad Abdul Ghofur; I Ketut Sukarasa; Rudy Darsono
BULETIN FISIKA Vol 23 No 1 (2022): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2022.v23.i01.p06

Abstract

Banyuwangi area is an earthquake prone area because it is close to the megathrust zone (indo-Australian and Eurasian plate junction) and back arc. The aim of this research is to determine the most suitable empirical formula for Banyuwangi area and to determine the level of earthquake hazard in Banyuwangi region. The peak ground acceleration value is determined by comparing 5 empirical equations, namely the empirical formula of Mc. Guirre R.K (1963), Esteva (1970), Donovan (1973), Setiawan (2012), and Fukushima & Tanaka (1990). The results show that the empirical formula Setiawan is the most suitable formula among other empirical formula. The largest earthquake hazard level is in the eastern Banyuwangi region in the scale of VII-VIII MMI, with the highest peak ground acceleration value of 301,801 gal.
PEMETAAN BAHAYA GEMPA BUMI DAN POTENSI TSU-NAMI DI BALI BERDASARKAN NILAI SEISMISITAS Bayu Baskara; I Ketut Sukarasa; Ardhianto Septiadhi
BULETIN FISIKA Vol 18 No 1 (2017): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Bali is one of the areas prone to earthquake and tsunami as being at the junction of two plates, namely the Eurasian plate and the Indo-Australian plate is located in the south of Bali and back arc trust zones are located in the North of Bali. We need research on the potential dangers of earthquakes and tsunami in Bali are based on the value of seismicity which is interpreted by the value of b and a. This study uses earthquake data on the coordinates 6?-11? SLand 114?-116? EL with 339 data that was processed using Zmap in order to obtain the value of b at 1.57 ± 0.008 and the value of a is 10.6 and maximum magnitude of 7.1 Mw. From mapping the values ??of b and a known area that has the highest value of b and a lies in the sea area to the south of Bali, Karangasem and Buleleng to the northern region of Bali. Furthermore, for mapping the tsunami in Bali using the TOAST application obtained tsunami prone areas of Bali, Kuta Beach, East Buleleng and Karangasem.
Identifikasi Hubungan Aktivitas Petir Tipe Cloud to Ground Dengan Curah Hujan Di Seputaran BMKG Sanglah Tahun 2018 Lintang Ardhana Reswari; I Ketut Sukarasa; I Putu Dedy Pratama
BULETIN FISIKA Vol 22 No 2 (2021): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2021.v22.i02.p07

Abstract

Denpasar has a high lightning hazard. CG (Cloud to Ground) lightning type is the lightning that have a direct impact to human. This study aims to determine the relationship between the amount of lightning strikes and rainfall that occurred in BMKG Sanglah on 2018. The data used are rainfall data obtained from Automatic Rain Gauge (ARG) and Cloud to Ground (CG) lightning data from lightning detectors installed at BMKG Sanglah Denpasar. CG lightning data (positive and negative) is limited within a 5 km radius of sensor. The lightning and precipitation data obtained then looked at the correlation using spearman correlation test to find out the relationship between rainfall and lightning The results obtained show the relationship between daily and monthly rainfall and CG lightning with Spearman correlation of 0,372 and 0.834, which means that the relation between the two variables has proportionate correlation where rainfall is bigger than lightning will also.
PENGARUH MADDEN JULIAN OSCILLATION (MJO) TERHADAP ANOMALI CURAH HUJAN DI PROVINSI BALI TAHUN 1991-2020 Oktaviana Nurhayati Murni; I Ketut Sukarasa; Rakhmat Prasetia; I Made Dwi Wiratmaja; Heppy Febrian Abdi Bintari
BULETIN FISIKA Vol 24 No 2 (2023): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2023.V24.i02.p03

Abstract

Research has been conducted on the influence of the Madden Julian Oscillation (MJO) phenomenon of rainfall anomalies in Bali Province since 1991-2020. Research aims to figure out the conditions, anomalies, and frequency distributions rainfall in Bali Province during the existence of MJO’s 4 and 5 phase for 1991-2020 a descriptive statistical methods. The data used is daily rainfall data for 1991-2020. The results of observations from the Jembrana Class II Climatology Station and MJO data for phases 4 and 5 which monitor the presence of the MJO. The result of this study is a graph of the average rainfall calculated to inform rainfall conditions during MJO and compared to normal. Based on the results of calculations and data analysis shows Pos Candi Kuning is the post that has the most impact, this is because it has the highest increase in the amount of rainfall than normal with the highest increase of 72 mm/month occurring in March. Then for rainfall anomalies in the form of a positive anomalous percentage graph that causes increased precipitation in Bali Province. The anomaly of positive rainfall is 65% at Pos Candi Kuning. Based on the trend of the distribution of the frequency of rain events on the graph of the distribution of rainfall in the Province of Bali, generally there is an increase, but the period 2001-2005 and 2011-2015 has decreased.
Analisis Sebaran Debu Vulkanik Erupsi Gunung Kelud Berdasarkan Pergerakan Angin di Wilayah Jawa (Studi Kasus Erupsi Gunung Kelud 13 Februari 2014) Romadhon Ilham Imani; I Ketut Sukarasa; Kadek Sumaja; Komang Ngurah Suarbawa; Ida Bagus Alit Paramartha; Ngurah Sutapa
BULETIN FISIKA Vol 24 No 2 (2023): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2023.V24.i02.p11

Abstract

The distribution of volcanic ash from the eruption of Mount Kelud on 13 February 2014 had a significant impact on atmospheric conditions in the Java Island region. This research was conducted to identify the trajectory of volcanic dust, the mass value of the particles, and the range of distribution in the atmosphere which is affected by wind conditions. The influence of the wind is based on wind direction and speed by doing wind streamline modelling. Furthermore, the assistance of volcanic ash distribution was carried out using the Red, Green, Blue (RGB) composite image method, and the particle mass and distribution range of volcanic dust was carried out using hysplit modelling. The atmospheric layer analysed at the flight level area at 16 altitudes, namely at an altitude of 1.5-16.1 km. From the results of the analysis, it was found that the maximum wind speed is 38 m/s, which is at an altitude of 16.1 km. The trajectory of the distribution of volcanic ash heads to the Northeast and then most of it turns to the Southwest due to wind direction and speed. The highest maximum particle mass value is at an altitude of 16.1 km, which is 580,000 mg/m2 with a particle distribution range of 2,600 km from the position of Mount Kelud.
Co-Authors Aditya, I Putu Sukma Nanda Adnyana, I Gusti Agung Putra Adnyna, I. G. A. P Alfha Abrianto L. Tobing Alit Pramarta, Ida Bagus Ardhianto Septiadhi Baskoro, Winardi Tjahyo Bayu Baskara Crisanti Uduk, Maria Daniel Happy Putra Dedy Pratama, I Putu Desiderius Jarut Devi Irma Putri Elvin Riyono Fernandes Flaviana Pinto Gunawan, Tomy Gusti Ngurah Sutapa Heppy Febrian Abdi Bintari Husnul Hatimah Husnul Hatimah, Husnul I G. A. Widagda I Gde Antha Kasmawan I Gede Hendrawan I Gusti Agung Made Duwanda I Gusti Ketut Satria Bunaga I Ketut Putra I Ketut Putra I Made Dwi Wiratmaja I Made Kertayasa I Made Kris Adi Astra I Nengah Sandi I Putu Dedy Pratama I Putu Sukma Nanda Aditya I Wayan Andi Yuda I Wayan Wirata Ida Bagus Alit Paramarta Ida Bagus Alit Paramartha Ida Bagus Made Suryatika Ita Purnamaimun Kadek Sumaja Kaha, Astried Valentine Kelo, Febriyanti Jia Komang Ngurah Suarbawa Lintang Ardhana Reswari Made Prama Yudistira Made Sumadiyasa Mahmud Yusuf Mahmud Yusuf Muhamad Abdul Ghofur Nainggolan, Putri Srimalemta Ni Kadek Nova Anggarani Ni Kadek Sugestiani Ni Luh Gede Desy Suryaningsih Ni Made Rysnawati Ni Nyoman Rupiasih Ni Nyoman Wendri Ni Wayan Meri Monika Sari Nurhalima, Nurhalima Nyoman Wendri Oktaviana Nurhayati Murni Purnamaimun, Ita Rakhmat Prasetia Romadhon Ilham Imani Rudy Darsono Rudy Darsono Rudy Darsono Sanjaya Natadiredja Satriya Wibawa, I Made Septian Jonathan Setiawan, Yohanes Agus Sinaga, Gerson Soleh, Anggun Mohamad Sumaja, Kadek Supardi, I Wayan Threza, Imelda Tobing, Alfha Abrianto L. Tyastama, Arief Wayan Mita Restitiasih Widagda, I. G. A Winardi Tjahyo Baskoro Winardi Tjahyo Baskoro Wisnu Ari Adi Wisnu Ari Adi Yohanes Agus Setiawan Yuliara, I Made