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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Journal of Oceanography
Oksto Ridho Sianturi
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Earth & Planetary Sciences

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Pemodelan Hidrodinamika Sederhana Berdasarkan Data HIdro-Oseanografi Lapangan di Teluk Lampung Sianturi, Oksto Ridho; Widada, Sugeng; Prasetyawan, Indra Budi; Novico, Franto
Journal of Oceanography Vol 2, No 3 (2013)
Publisher : Program Studi Oseanografi, Jurusan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1984.174 KB)

Abstract

ABSTRAKPerairan Teluk Lampung merupakan salah satu daerah yang wilayah pesisirnya digunakan untuk berbagai kegiatan baik kegiatan seperti perikanan tangkap, budidaya mutiara, pariwisata, pelayaran, pelabuhan, pemukiman, maupun kegiatan perdagangan. Pencemaran yang dihasilkan oleh salah satu kegiatan diatas akan menyebar ke kawasan lain oleh gerakan massa air, yang pada gilirannya akan menimbulkan dampak negatif terhadap kegiatan lain di teluk. Segala aktivitas yang terjadi di Teluk Lampung membutuhkan adanya pemahaman hidrodinamika guna menghindari atau meminimalisasi efek negatif yang bisa terjadi di Perairan Teluk LampungPenelitian ini bertujuan untuk mengetahui kondisi hidrodinamika Teluk Lampung dengan menggunakan software MIKE 21 HD. Proses pengambilan data lapangan dalam penelitian ini dilakukan pada tanggal 6 April – 20 April 2011 di Teluk Lampung.Berdasarkan data lapangan dan hasil model diperoleh bahwa Perairan Teluk Lampung adalah perairan tipe campuran dengan dominasi pasang surut ganda, dimana kondisi perairan saat pasang perbani dan pasang purnama memiliki kondisi yang berbeda. Pada saat pasang perbani, kecepatan arus berkisar antara 0.06 – 0.08 m/s, sedangkan saat pasang purnama kecepatan arus berkisar antara 0.1 – 0.13 m/s. Sedangkan elevasi saat pasang purnama lebih tinggi dibandingkan saat pasang perbani, yaitu 0.7 meter dan -0.6 meter berbanding 0.45 meter dan -0.3 meter. Verifikasi dilakukan dengan membandingkan pasut model dan lapangan, didapat nilai MRE sebesar 4.7 %. 
Vertical and Horizontal Variability of Chlorophyll-a and Its Relationship with Environmental Parameters in the Waters of Sangihe and Talaud Islands, North Sulawesi, Indonesia Firdaus, Mochamad Ramdhan; Rachman, Arief; Fitriya, Nurul; Wijayanti, Lady Ayu Sri; Rozirwan, Rozirwan; Purwandana, Adi; Prayitno, Hanif Budi; Alfiansyah, Yustian Rovi; Sianturi, Oksto Ridho; Sugeha, Hagi Yulia
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 1 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.1.119-132

Abstract

The chlorophyll-a is an important biological parameter that could act as a proxy to indicate the abundance of phytoplankton and the primary productivity of an aquatic ecosystem. This paper investigates the vertical and horizontal variability of chlorophyll-a in the waters of Sangihe and Talaud Islands, Indonesia, and its correlation with water environmental parameters. In this study, the distribution of chlorophyll-a, temperature, salinity, and nutrients (NO3 and PO4) from the surface to a depth of 200 m (photic zone) was measured at 29 research stations. The results showed that the distribution of chlorophyll-a in the waters of the Sangihe-Talaud Islands was varied vertically and horizontally. The waters around the Sangihe Islands generally exhibited a higher chlorophyll-a distribution and shallower Deep Chlorophyll Maxima compared to the water around the Talaud Islands. The concentration of chlorophyll-a varied between 0.0017 and 1.2155 mg.m-3, with most of the water column in Sangihe-Talaud considered oligotrophic, although some stations or depths were mesotrophic or slightly eutrophic. The maximum chlorophyll-a concentration was found in the sub-surface layer at depths between 46 and 101 m. The low N:P ratio (<16) and N:Si ratio (<1) indicate that the water columns of Sangihe-Talaud, up to a depth of 200m, were N-limited. Based on the GAM analysis, chlorophyll-a concentration in Sangihe-Talaud waters was primarily regulated by temperature, salinity, and the N:P ratio, with weak influence from phosphate and the N:Si ratio. The analysis also suggests that primary productivity in Sangihe-Talaud is sensitive to temperature changes, indicating its vulnerability to future warming events.
Co-Authors Adi Purwandana Alfiansyah, Yustian Rovi Arief Rachman Firdaus, Mochamad Ramdhan Franto Novico Hanif Budi Prayitno Indra Budi Prasetyawan Nurul Fitriya Rozirwan . Sugeha, Hagi Yulia Sugeng Widada Wijayanti, Lady Ayu Sri