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All Journal AQUATIC SCIENCE & MANAGEMENT JURNAL ILMIAH PLATAX
Pelle, Wilmy Etwil
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science

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Characteristics of sea surface current during the second transitional monsoon in the Bangka strait, North Sulawesi, Indonesia Kusumawardani, Niken; Djamaluddin, Rignolda; Angmalisang, Ping Astony; Manu, Lusia; Pelle, Wilmy Etwil
JASM Vol. 12 No. 1 (2024): APRIL
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jasm.v12i1.55445

Abstract

Understanding the dynamics of surface currents in the Bangka Strait is crucial for various maritime and coastal activities. This strait connects Likupang, a super-priority tourism destination, with other islands in North Sulawesi. These activities include navigation safety, inter-island transportation, fisheries, search and rescue operations, and marine pollution control. This study investigated the characteristics of currents in the strait using a hydrodynamic model called Delft3D. The result revealed that the currents exhibit a tidal pattern, with dominant westward flow during floods and eastward flow during ebb. Maximum sea current velocity during spring tide in the second transition monsoon occurred in September 2022, with an average speed of 102.67 cm/s. Current ellipse analysis confirmed the tidal type of the currents.
Characteristics of Ocean Currents in the Lembeh Strait, North Sulawesi Rori, Jenever; Angmalisang, Ping Astony; Pelle, Wilmy Etwil; Kumampung, Deislie R. H.; Djamaaludin, Rignolda; Rampengan, Royke M
Jurnal Ilmiah Platax Vol. 11 No. 2 (2023): ISSUE JULY-DECEMBER 2023
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v11i2.48869

Abstract

Current is a process of mass transfer of seawater that moves from one place to another continuously or occurs continuously. The current generation factor on the surface of the water is caused by two things, namely the wind and the movement of the rise and fall of sea level. The Lembeh Strait is an Archipelago Port Area and a hub port in Kawasan Timur Indonesia (KTI), as well as an area with local transportation routes for the community. For this reason, it is necessary to research to obtain information about the characteristics and patterns of currents that occur in the Lembeh Strait. This research was conducted using a database of currents and tide data over the period from 2021 to 2022. The research method used is quantitative. Data sources were taken from Badan Meteorologi Klimatologi dan Geofisika (BMKG) Stasiun Maritim Bitung and the Copernicus Marine Service website. These data were analyzed using methods that fit the needs of the data. Flow and Tidal data were analyzed using WRPLOT View, Ocean Data View, Microsoft Excel, and Origin Pro. The results of data processing show the direction and speed of the current as well as the relationship between the tides and currents in the waters of the Lembeh Strait. The scatter plot of currents on the surface layer of the sea is elliptical, this indicates that the currents that dominate in these waters are tidal. So the results of the study show that ocean currents in the Lembeh Strait have current characteristics that are dominantly influenced by tides and the dominant current direction is formed in 2021 and 2022 towards the Southwest and Northeast. Keywords: Current, Tidal Current, Lembeh Strait. Abstrak Arus merupakan proses pergerakan massa air laut yang berpindah dari satu tempat ke tempat lain secara kontinu atau terjadi secara terus-menerus. Faktor pembangkit arus di permukaan air disebabkan oleh dua hal yaitu angin dan pergerakan naik turunnya permukaan air laut. Selat Lembeh merupakan Kawasan Pelabuhan Nusantara dan sebagai salah satu hub port di kawasan Timur Indonesia (KTI), serta sebagai kawasan dengan alur transportasi lokal bagi masyarakat. Untuk itu perlu dilakukan penelitian guna mendapatkan informasi tentang karakteristik dan pola arus yang terjadi di Selat Lembeh.  Penelitian ini dilakukan dengan menggunakan basis data arus dan data pasang surut selang periode waktu dari tahun 2021 sampai dengan tahun 2022.  Metode penelitian yang digunakan adalah metode kuantitatif. Sumber data diambil dari instansi Badan Meteorologi Klimatologi dan Geofisika (BMKG) Stasiun Maritim Bitung dan dari Website Copernicus Marine Service. Data-data tersebut di analisis menggunakan metode yang sesuai dengan kebutuhan data. Data Arus dan Pasang Surut dianalisis menggunakan WRPLOT View, Ocean Data View, Microsoft Excel, dan Origin Pro. Hasil pengolahan data menunjukan arah dan kecepatan arus serta hubungan antara pasang surut dan arus di perairan Selat Lembeh. Scatter plot arus pada lapisan permukaan laut memiliki bentuk ellips, ini menunjukkan bahwa arus yang mendominasi di perairan tersebut adalah arus pasang surut. Sehingga hasil penelitian menunjukan arus laut di Selat Lembeh memiliki karakteristik arah arus dominan dipengaruhi oleh pasang surut dan diperoleh arah arus dominan terbentuk di tahun 2021 dan tahun 2022 menuju ke arah Barat Daya dan Timur Laut. Kata kunci : Arus, Arus Pasut, Selat Lembeh.
Cell Density Of Microalgae Tetraselmis chuii, With Lead Acetate Compound (Pb(Ch3COO)2) at Different Concentrations Kadang, Nurfadillah; Kemer, Kurniati; Mantiri, Desy Maria Helena; Kaligis, Erly Y.; Rumampuk, Natalie D.C.; Pelle, Wilmy Etwil
Jurnal Ilmiah Platax Vol. 12 No. 2 (2024): ISSUE JULY-DECEMBER 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jip.v12i2.49957

Abstract

Microalgae are a group of microscopic plants, included in the algae class, with a diameter of between 3-30 µm, single cells, and colonies that can live in all areas of fresh water and seawater. Microalgae contain active components that can be used in the cosmetic, food, pharmaceutical, and nutraceutical industries. This study aimed to determine the density of marine microalgae Tetraselmis chuii cells in culture media before treatment and to determine the density of T.chuii microalgae cells by administering lead acetate compounds at different concentrations. The method used in this study was culturing marine microalgae cells in balanced containers with lead acetate administration at concentrations of 30 ppm, 50 ppm, and 70 ppm, then observations were made by counting the number of cells under an Olympus microscope with 10x magnification using a hemocytometer. Observations were made every day at the same hour until the death phase. Microalgae culture uses a Light Emitting Diode (LED) lamp with 6,840 lux lighting. The results showed that the growth of T.chuii microalgae cells after administration of lead acetate compound showed unstable growth compared to the untreated container (control). Keywords: Microalgae; Tetraselmis chuii; Culture; Lead Acetate. Abstrak Mikroalga merupakan kelompok tumbuhan yang berukuran sangat kecil termasuk dalam kelas alga, memiliki diameter antara 3-30 μm baik sel tunggal maupun koloni yang dapat hidup di seluruh wilayah perairan air tawar maupun air laut. Mikroalga mengandung komponen aktif yang dapat digunakan dalam bidang industri kosmetik, makanan, farmasetika dan nutrasetikal. Adapun tujuan dari penelitian ini yaitu untuk mengetahui kepadatan sel mikroalga laut Tetraselmis chuii dalam media kultur sebelum perlakuan dan mengetahui kepadatan sel mikroalga T.chuii dengan pemberian senyawa timbal asetat pada konsentrasi yang berbeda. Metode yang digunakan pada penelitian ini yaitu mengkultur sel mikroalga laut pada wadah terkontrol dengan pemberian timbal asetat pada konsentrasi 30 ppm, 50 ppm, 70 ppm, kemudian dilakukan pengamatan melalui perhitungan jumlah sel di bawah mikroskop olympus dengan pembesaran 10x menggunakan haemocytometer. Pengamatan dilakukan setiap hari pada jam yang sama sampai pada fase kematian. Kultur mikroalga menggunakan lampu Light Emitting Diode (LED) dengan pencahayaan 6.840 lux. Hasil penelitian menunjukkan bahwa pertumbuhan mikroalga mikroalga T.chuii mengalami penurunan sel secara signifikan setelah pemberian senyawa timbal asetat dibandingkan dengan kontrol yang tidak diberi perlakuan. Kata kunci: Mikroalga; Tetraselmis chuii; Timbal Asetat.
Co-Authors Angmalisang, Ping Astony Djamaaludin, Rignolda Erly Y. Kaligis, Erly Y. Kadang, Nurfadillah Kumampung, Deislie R. H. Kurniati Kemer Kusumawardani, Niken Mantiri, Desy M. H Manu, Lusia Natalie D Rumampuk Rignolda Djamaluddin Rignolda Djamaludin Rori, Jenever Royke M Rampengan Sirajudin, Irfan