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All Journal Indonesian Journal of Geography Journal of Marine and Aquatic Sciences Bumi Lestari Ecotrophic, Journal of Environmental Science
Chonnaniyah Chonnaniyah
Program Studi Teknik Lingkungan, Institut Sains dan Teknologi Nahdlatul Ulama Bali (ISTNUBA), Jl. Pura Demak Barat No.31 Denpasar, Bali
Agriculture, Biological Sciences & Forestry Humanities Earth & Planetary Sciences Energy Environmental Science

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Landsat 8 Observation of the Internal Solitary Waves in the Lombok Strait I Wayan Gede Astawa Karang; Chonnaniyah Chonnaniyah; Takahiro Osawa
Indonesian Journal of Geography Vol 51, No 3 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.143 KB) | DOI: 10.22146/ijg.42655

Abstract

Landsat  8,  Landsat  Data  Continuity  Mission  (LDCM)  satellite,  was  launched  on  11 February 2013 with Operation Land Imager (OLI) sensors. Tis sensor has better radiometric performance than the previous mission, which is quantized in the 12-bit dynamic range due to an increase in the signal-to-noise (SNR) ratio. In this analysis, the spatio-temporal distribution of the propagation of the internal solitary wave (ISW) in the Lombok Strait was extracted from the Landsat 8 images described for the first time.  Tere were 14 ISW events studied for period 2014  -  2015  using  Landsat  8.  Te  manifestations  of  ISW  recorded  on  Landsat  8  images  were then extracted using digitization method to investigate and measure several parameters and ISW distribution in the Lombok Strait. Te estimation results of the average ISW phase velocity in this study are 2.05 ms-1 with the direction of propagation heading north at an average angle of 19.08°. Tis study has shown that Landsat 8 can be used to monitor and analyze several internal wave parameters in the ocean.
STUDY OF INTERNAL SOLITARY WAVES FEATURE EXTRACTION BASED ON STATIONARY WAVELET TRANSFORM BY SENTINEL-1A IMAGE IN LOMBOK STRAIT Chonnaniyah Chonnaniyah; Takahiro Osawa; I Wayan Gede Astawa Karang
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 13 No 1 (2019)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.693 KB) | DOI: 10.24843/EJES.2019.v13.i01.p04

Abstract

Stationary Wavelet Transform (SWT), mother function Symlet 4, shows an effective method for Internal Solitary Waves (ISW) feature extraction and four parameters (soliton numbers, first crest length, wavelength and propagation direction) estimation by Sentinel-1A C-band Synthetic Aperture Radar (SAR) imagery in Lombok Strait. The ISW feature can be distinguished from other features using the SWT noise reduction process and simple thresholding methods. ISW feature extraction results by SAR images can show ISW characteristics more clearly and can be used as a basis for obtaining ISW spatial-temporal distribution maps in the Lombok Strait. Our estimation results show that the arc-like type of ISW in the Lombok Strait propagated to the north of the sill with the detected soliton numbers are 2 solitons per packets with a wavelength about 3.20 km and the first crest length varies about 60.27 km near the Kangean Island with the propagation direction about 50.38 degree to the North.
Analisis Kecepatan Perambatan Gelombang Internal Soliter di Selat Lombok dengan Citra Himawari-8 Chonnaniyah Chonnaniyah; I Wayan Gede Astawa Karang; Abd. Rahman As-syakur; Takahiro Osawa
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p04

Abstract

Internal waves are phenomena that occur below sea surface. One of the most observed types of internal waves was called a solitary wave or soliton so it is often known as an internal solitary wave (ISW). Lombok Strait was one of the straits located in the southern part of the Indonesian archipelago which has the characteristics of intensive ISW generation because this strait has complex waters characteristics. This study aim to analyzed in detail the changes in the ISW propagation speed at the first crest soliton every 10 minutes using Himawari-8 data. The detected ISW pattern is then extracted at the first crest of the soliton as a reference to measure the distance between the detected soliton every 10 minutes as input in estimating the propagation speed. The Himawari-8 image which was in this study detected 2 ISW packets in the Lombok strait area. Packet 1 which was detected in the northern part of the Lombok strait approaching Kangean island had a group speed of 2.22 m/s and Packet 2 which was detected in the area around the Lombok strait had a group speed of 2.78 m/s. The difference in group velocity of the two packets is due to the variation in depth along the ISW propagation. The analysis results of changes in ISW propagation speed in this study indicate that Himawari-8 imagery is a very effective instrument for analysing changes in ISW propagation speed in detail every 10 minutes which is difficult for satellite imagery which usually has low temporal resolution.
Pelatihan Pengolahan Minyak Jelantah Menjadi Sabun Cuci Batangan dan Lilin Aromaterapi Husnayaen Husnayaen; Suci Rahmawati; Dwi Puspa Arini; Chonnaniyah Chonnaniyah; Windy Lestari; Alfian Anhar
Bumi Lestari Journal of Environment Vol 23 No 1 (2023)
Publisher : Environmental Research Center (PPLH) of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/blje.2023.v23.i01.p01

Abstract

Cooking oil is one of the primary ingredients that must be available for the household needs of Indonesians. Population growth, industrial development, restaurants, and fast-food restaurants cause the use of cooking oil to increase. The increase in the use of cooking oil will cause an increase in frying waste. Waste cooking oil that is not managed properly will cause pollution. Lack of public awareness of the dangers of waste cooking oil to the environment so there is a need for guidance to the community regarding the dangers of disposing of used cooking oil waste into the environment and providing solutions for the use of waste cooking oil in new products that have economic value. Therefore, as a community service from the Institute of Science and Technology of Nahdlatul Ulama Bali (ISTNUBA), we try to invite the community in Banjar Anyar Village, Kediri, Tabanan Regency, Bali to be able to participate in training on processing waste cooking oil into bar washing soap and aromatherapy candles. The method is counseling and distribution of brochures about the dangers and benefits of waste cooking oil. This training activity is expected to increase public knowledge and awareness of managing waste cooking oil and can open up entrepreneurial opportunities, create jobs and improve the living standards of the surrounding community.
Co-Authors Abd. Rahman As-syakur Alfian Anhar Dwi Puspa Arini Husnayaen Husnayaen I Wayan Gede Astawa Karang Suci Rahmawati Takahiro Osawa Takahiro Osawa Takahiro Osawa Windy Lestari