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All Journal HAYATI Journal of Biosciences ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Atom Indonesia Journal Jurnal Kesehatan Masyarakat Journal of Marine Research International Journal of Marine and Aquatic Resource Conservation and Co-existence Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal Kelautan Tropis Jurnal Keselamatan Radiasi dan Lingkungan Jurnal Segara Jurnal Riset dan Rekayasa Kelautan Indonesian Journal of Oceanography
Muslim Muslim
Departemen Oseanografi , Fakultas Perikanan Dan Ilmu Kelautan, Universitas Diponegoro
Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Environmental Science Materials Science & Nanotechnology Physics Public Health Social Sciences Other

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Sebaran Thermal Front Musiman di Wilayah Perairan Selat Madura Menggunakan Single Image Edge Detection Trinugroho Trinugroho; Alfi Satriadi; Muslim Muslim
Journal of Marine Research Vol 8, No 4 (2019): Journal of Marine Research
Publisher : Departemen Ilmu Kelautan, Fakultas PerikanJurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (973.655 KB) | DOI: 10.14710/jmr.v8i4.24815

Abstract

Thermal front didefinisikan sebagai pertemuan antara dua masa air dengan karakteristik suhu yang berbeda sehingga membentuk gradien suhu. Thermal front merupakan salah satu proses oseanografi penting yang dapat mempengaruhi kondisi fisik, kimia, maupun biologi di laut. Tujuan dari penelitian ini adalah untuk mengetahui sebaran thermal front musiman di perairan Selat Madura, Jawa Timur. Deteksi thermal front dilakukan pada lapisan permukaan laut dengan menggunakan citra AquaMODIS untuk suhu permukaan laut. Citra AquaMODIS yang digunakan memiliki resolusi spasial sebesar 1 km x 1 km dan resolusi temporal selama satu hari. Metode yang digunakan untuk mendeteksi fenomena ini adalah metode Single Image Edge Detection (SIED) yang diperkenalkan oleh Cayula dan Cornilon pada tahun 1992. Metode ini menggunakan prinsip deteksi tepi piksel yang mempertimbangkan nilai gradien suhu dan pola arah dari piksel yang memiliki gradien suhu. Hasil yang diperoleh berupa sebaran spasial dan temporal fenomena thermal front di perairan Selat Madura. Sebaran temporal berdasarkan komposit harian dalam satu musim selama empat tahun dari tahun 2012 – 2016. Rata – rata kejadian thermal front tiap musim sebanyak 446 kali pada musim barat, 1893 kali pada musim peralihan I, 1038 kali pada musim timur, dan 2375 kali pada musim peralihan II. Penyebab utama kejadian front di perairan Selat Madura adalah akibat adanya arus eddy dan masukan masa air laut dari wilayah timur Selat Madura. Thermal front defined as an ecounter of two water masses which has different temperature (thermal) characteristics and create a thermal gradient. Thermal front is one of the most important oceanographic proceses that can make a significant impact to physical, chemical, and biological process in the ocean. The aim of this research is to understand seasonal thermal front distribution in Madura Strait, East Java. Thermal front was detected in the surface layer of water, using AquaMODIS for Sea Surface Temperature (SST). AquaMODIS image which used in this research has 1 km x 1 km spatial resolution and one day (24 hours) temporal resolution. Front detection in this research is using Single Image Edge Detection by Cayula Cornilon (1992). This method is using edge detection of pixel, considering the value of thermal gradient and pattern of the pixel edge. The result of this research is spatial and temporal distribution of thermal front in Madura Strait. Temporal distribution are based on composite result of daily front detection in seasonal range for four years from 2012-2016. Seasonal average of front occurence is 446 times in western season, 1893 times in Transition I, 1038 times in eastern season and 2375 times in Transition II. The main cause of front in Madura strait is eddy current and water masses ecounter from eastern area of Madura.
239/240Pu Dispersion Modeling for Emergencies During Nuclear Power Plant Operations in Malaysia Muslim Muslim; Sa'iyd Husayn Ahmadi; Jarot Marwoto; Heny Suseno; Yvette Agyiriba Aggrey
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 27, No 3 (2022): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.27.3.215-222

Abstract

The East Coast of Johor in Malaysia is a strategic area as a candidate site for nuclear power plants. Its location is near coastal area and is therefore convenient to use seawater as a source of cooling for power plants. This makes the East Malaysia waters, and their surroundings stand a high risk of direct radioactive contamination, especially in event of an accident. Pu is a non-conservative or reactive radionuclide that easily settles with particles and has high radiotoxicity and radiochemistry, making it very dangerous. The purpose of this study was to determine the distribution patterns of 239/240Pu releases in the waters of East Malaysia and the surrounding waters. To determine the affected areas due to 239/240Pu pollution using MIKE flow flexible mesh module and particle tracking module. The magnitude of 239/240Pu used in this model is based on the disaster in Fukushima Daiichi in 2011. This research can be used as a mitigation of 239/240Pu pollution when a nuclear reactor disaster occurs in the area around Indonesia's territorial border. Discharge of 239/240Pu was simulated during the west and east monsoons season which result in the distribution pattern following the seasonal flow pattern. During the west monsoon, the dispersion speed of 239/240Pu is four times faster than the east monsoon. The 239/240Pu distribution is predominantly towards the south, however, the contaminated area was only occurred on the coast of Johor and does not extend to the waters of Indonesia.
Co-Authors Adhi Prasojo Akhmad Tri Prasetyo Alfi Satriadi Ali Ali Andriana Kartina Wingtyas Anindya Wirasatriya Aris Ismanto Asri Wahyuningsih Azhar Afi Azis Rifai B Budiawan Baskoro Rochaddi Chairun Annisa Aryanti Chairun Annisa Aryanti Denny Nugroho Sugianto Djunaedi Muljawan Dwi Haryo Ismunarti Dwi Haryo Ismunarti Elis Indrayanti F. Rafsani Fannia Wahyu Ramadhanty Gentur Handoyo Ghifari Raihan Silam Siregar H. Suseno H. Suseno H. Suseno Hariyadi Hariyadi Heny Suseno Heny Suseno Heny Suseno Heny Suseno Heryoso Setiyono Jarot Marwoto Kunarso Kunarso Laksmono Widagdo Larosa Nurfikri Gamellia Lilik Maslukah M. Makmur M. N. Yahya M.J. Pratiwi Metrio Swandiko Mohamad Nur Yahya Muh Yusuf Muhammad Alif Achyansyah Muhammad Helmi Muhammad Sababa Alhaq Muhammad Zainuri Murdahayu Makmur Navila Bidasari Alviandini Nugroho Agus D Nuriyati Nuriyati Oceana Windyartanti Osen Faber Romario Tampubolon Petrus Subardjo Purwanto Purwanto Putranto Kondang Wijaya Ratih Indraswari Reza Agung Arjana Rikha Widiaratih Sa'iyd Husayn Ahmadi Siti Nurul Aini Siti Saodah Sri Yulina Wulandari Sugeng Widada Sumi Hudiyono Syafiq Muhammad Aziz Syafrei Adi Iskandar Teguh Agustiadi Trinugroho Trinugroho Tulus Aldrian Siregar Wahyu Retno Prihatiningsih Wahyu Retno Prihatiningsih Wahyu Retno Prihatiningsih Wahyu Retno Prihatiningsih Warsito Atmodjo Yvette Agyiriba Aggrey Zanet Dwi Aprilia