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All Journal Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Journal of Oceanography Proceeding of International Conference on Biology Education, Natural Science, and Technology
Arintika Widhayanti, Arintika
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Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Physics

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SEBARAN TUMPAHAN MINYAK DENGAN PENDEKATAN MODEL HIDRODINAMIKA DAN SPILL ANALYSIS DI PERAIRAN CILACAP, JAWA TENGAH Widhayanti, Arintika; Ismanto, Aris; Yulianto, Bambang
Journal of Oceanography Vol 4, No 4 (2015)
Publisher : Program Studi Oseanografi, Jurusan Ilmu Kelautan, Universitas Diponegoro

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Abstract

Perairan Cilacap memiliki pelabuhan laut yang berfungsi sebagai pelabuhan ekspor-impor termasuk aktivitas bongkar muat minyak dari kapal-kapal tanker yang menyebabkan perairan Cilacap rentan terhadap tumpahan minyak. Tujuan dari penelitian ini untuk mengetahui pola sebaran dan proses pelapukan (weathering) yang meliputi waktu pemaparan, proses disolusi, proses dispersi vertikal, proses emulsifikasi, dan proses evaporasi pada tumpahan minyak mentah dan aspal di Perairan Cilacap yang dimodelkan menggunakan model hidrodinamika 2D dan Spill Analysis. Data yang digunakan dalam penelitian ini meliputi data arus laut, data pasang surut, data angin, data suhu air laut, data batimetri, data suhu udara, data cloudiness, data oil properties, dan data lalu lintas kapal. Hasil simulasi model sebaran tumpahan minyak mentah dan aspal memperlihatkan sebaran menuju ke arah barat laut saat pasang tertinggi, sebaliknya minyak menyebar ke arah tenggara saat surut terendah. Penyebaran tumpahan minyak berbentuk lintasan saat kondisi perbani dan partikel minyak berbentuk acak saat kondisi purnama. Waktu pemaparan aspal berlangsung lebih lama, yaitu berkisar 280 jam daripada waktu pemaparan minyak mentah, yaitu berkisar 259 jam. Proses pelapukan pada tumpahan minyak terhadap lamanya waktu tumpahan minyak menunjukkan bahwa perubahan laju emulsifikasi berlawanan dengan laju evaporasi dan sebanding dengan laju dispersi vertikal, sedangkan laju disolusi tidak mengalami perubahan signifikan. Tumpahan minyak setelah 24 jam memperlihatkan bahwa proses disolusi, dispersi vertikal, dan evaporasi pada minyak mentah lebih tinggi daripada aspal. Namun, proses emulsifikasi pada aspal lebih tinggi daripada minyak mentah.
THE EFFECTIVENESS OF COMMUNITY-BASED SEA TURTLE MONITORING SUPPORTS HATCHING SUCCESS ON BANDO ISLAND, PIEH ISLAND MARINE PROTECTED AREA Widhayanti, Arintika; Tyas, Diani Estining; Nugraha, Adiguna Rahmat; Jasilah, Nur; Hanif, Andriyatno; Hamdika, Wahyu; Irfansyah, Rahmat
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 20, No 3 (2024): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.20.3.110-116

Abstract

Bando Island is an important part of Pieh Island Marine Protected Area which is a sea turtle nesting habitat in West Sumatra Province. Sea turtle conservation is carried out collaboratively by community groups driving conservation, island customs, and the people of Padang Pariaman Regency. The community groups and the island owners' customary law conduct sea turtle conservation on Bando Island. The purpose of this study was to identify community involvement in sea turtle monitoring activities and analyze the hatching success as an indicator of the effectiveness of community-based sea turtle monitoring on Bando Island. Field surveys were conducted from January 2020 to August 2024. The method used in analyzing research data were quantitative method. The community involvement in sea turtle monitoring consisted of observation, data collection, and reporting. The sea turtle species that landed were green sea turtles (Chelonia mydas) and hawksbill turtles (Eretmochelys imbricata). The number of eggs moved to semi-natural relocated nests is 13.123 and the number of hatchlings released is 10.699 green hatchlings and 1.730 hawksbill hatchlings. The effectiveness of community-based sea turtle monitoring can be seen from the discovery of sea turtle tracks that have the potential to find egg nests, the percentage of egg hatching in semi-natural relocated nests was 91,72% indicating optimal hatching power, and hatching success reaching 90.64% which is included in the high category.
Turtle Nesting Habitat Conditions on Pandan Island, Pieh Island Conservation Area, West Sumatera Prima, M.; Widhayanti, Arintika; Nugraha, Adiguna Rahmat
Proceeding of International Conference on Biology Education, Natural Science, and Technology 2024: Proceeding of International Conference on Biology Education, Natural Science, and Technology
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Potential as a suitable habitat for turtles to settle and breed. The objective of this work is to assess the state of turtle nesting sites and evaluate the findings from turtle monitoring efforts in the Pieh Island Conservation Area. Observations were conducted directly from September 25th to September 30th, 2023. A quantitative method was employed. The materials that were utilized consist of green sea turtles (Chelonia mydas), hawksbill turtles (Eretmochelys imbricata), and olive ridley turtles (Lepidochelys olivaceae). The nesting habitat data encompasses information on the proximity of vegetation to the tidal limit, beach slope temperature and humidity levels, as well as the depth and quantity of eggs. Four stations serve as research sites. The distance of vegetation from the nests ranged from 7.6m to 13.4m, while the beach slope on Pandan Island varied between 3.62º and 6.19º. The temperature inside the nests ranged from 28ºC to 29.1ºC, with a humidity level of 77% to 88%. The nests had a depth of 50cm to 60cm. The results of this study show that Pandan Island Beach is a highly suitable site for turtle nesting.
Co-Authors Adiguna Rahmat Nugraha Aris Ismanto Bambang Yulianto Hamdika, Wahyu Hanif, Andriyatno Irfansyah, Rahmat Jasilah, Nur Prima, M. Tyas, Diani Estining