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All Journal Journal of Marine and Aquatic Sciences Buletin Udayana Mengabdi Ecotrophic, Journal of Environmental Science Mimbar PGSD Undiksha BIOTROPIA - The Southeast Asian Journal of Tropical Biology Jurnal Kelautan : Indonesian Journal of Marine Science and Technology REKAYASA Journal of Marine Research and Technology International Journal of Remote Sensing and Earth Sciences (IJReSES) Proceeding of International Conference on Biology Education, Natural Science, and Technology The International Journal of Remote Sensing and Earth Sciences (IJReSES)
I Gede Hendrawan
Program Studi Ilmu Kelautan, Fakultas Kelautan Dan Perikanan, Universitas Udayana
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Immunology & microbiology Physics Veterinary

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ANALISIS KELIMPAHAN MIKROPLASTIK PADA BIVALVIA DI PERAIRAN TUMINTING DAN MALALAYANG KOTA MANADO Nikita Ribka Kawung; I Wayan Sandi Adnyana; I Gede Hendrawan
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 16 No 2 (2022)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2022.v16.i02.p09

Abstract

Microplastic as a marine debris is currently become a global problem. Tuminting and Malalayang coasts as the study case in this research because these places were located in the high population and anthropogenic activity areas, that allowing the microplastic pollution. The goal of this research are to identify the types of microplastic, to analyze the abundance of microplastic and to evaluate the differences accumulation of microplastic in bivalve from Tuminting and Malalayang, Manado. This research is used a purposive sampling method. The analysis of microplastic in bivalves following C. M. Boerger et al. (2010) methods. The average of microplastic for the three species of bivalve in Tuminting for Cardidae sp. Was 5.75 particles/g, Venridae sp. 17.05 particles/g and Mytilidae sp. 130.06 particles/g, while in the three species of bivalve in Malalayang for Cardidae sp. 50.87 particles/g, Venridae sp. 9.56 particles/g and Mytilidae sp. 6.93 particles/g. Based on Kruskal Wallis analysis for bivalve of Tuminting is 0.087; Malalayang 0.616. The bivalve morphometric correlation test using Spearman Rank analysis showed a result 0.05 for Tuminting and 0.187 for Malalayang. The microplastics types that found in bivalve are fragments, films, fibers, foam, pellets, granules and the highest one is fiber. In this study, abundance of microplastic in bivalve from Tuminting also Malalayang waters, were found so it was necessary to disseminate this information to the public about the dangers of plastic. There must be a government regulations regarding the coastal area management related to garbage waste and have to make another research about the identification of the chemical that containing in microplastic in bivalves. Keywords: marine debris; microplastics; bivalve; manado
Distribusi Pencemaran Sampah Plastik pada Sempadan Sungai di Bali yang Bermuara di Perairan Selat Bali dengan Analisis Generalized Additive Models (GAM) Putu Bagus Angga Utama; I Gede Hendrawan; I Wayan Gede Astawa Karang; Putra Bagus Panji Pamungkas
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i01.p10

Abstract

Plastic waste in the oceans is a global problem which becomes a primary concern. The oceans become the final waste shelter that comes from land. Rivers essentially distribute plastic waste from the ground to the sea. Still, few studies currently examine waste distribution on riverbanks, especially rivers that discharge into the Bali Strait. This study aimed to determine the distribution of plastic waste along rivers in Bali Island that discharge into Bali Strait. Waste data was collected using the method developed by CSIRO (Commonwealth Scientific and Industrial Research Organisation). The data collected was used to generate prediction models with GAM to predict the distribution of plastic waste on riverbanks. The GAM method was chosen because it can accommodate non-linear influences; furthermore, GAM uses the smooth function to substitute details of parametric relationships on covariates so that it would give a good prediction. The distribution of plastic waste in 30 rivers was predicted. This research data showed that the most common waste found was a plastic waste at 90%, and non-plastic waste was found at 10%. Based on the prediction, most of the distribution of plastic waste along these 30 rivers had a relative concentration of plastic waste of about 0-20%. The highest concentration of plastic waste was found on the riverbanks of Selanbawak village, Pekutatan village, Pulukan village, Pendem village, and Tuwed village, with 80-100%. The riverbanks close to markets and tourism destinations and the number of populations with a strong relationship with smooth contributions caused relatively high plastic waste concentration. The prediction of the total plastic waste leakage at the riverbanks of the 30 rivers is 3,438,472 pieces, which this plastic waste will pollute Bali Strait.
Kelimpahan dan Jenis Mikroplastik pada Sedimen Lamun di Perairan Nusa Dua, Bali Sartika Ristama Silitonga; I Gede Hendrawan; I Nyoman Giri Putra
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i01.p01

Abstract

The Indonesian archipelago, especially Bali, has extensive coastline and marine waters. However, it is undeniable that some of these waters contain much plastic waste. Nusa Dua waters are located in the Bali Province area with many complex activities, ranging from port activities, water sports, tourism, restaurants, hotels, fishing activities, and others, so they have a high potential for plastic waste pollution. Plastic waste that floats in the ocean will degrade and become small debris called microplastics. Marine plastic debris is divided into several varieties based on size. It is called microplastic for those less than 5 millimeters in length; for those above 5 mm and up to 25 mm, it is mesoplastic. This study aimed to determine the abundance and types of microplastics found in Nusa Dua. This research was conducted in November-Desember 2021. Sampling was carried out in situ with the simple random sampling method of 400 grams of each sample at ten stations. Sediment sampling was carried out using a shovel. Then the ex-situ processing was carried out by drying wet sediment, weighing dry sediment, density separation, filtering, and visual sorting. The results showed that the seagrass sediments in Nusa Dua waters were contaminated with microplastic. Four types of microplastic were found: fragment, fiber/filament, film/soft plastic, and foam. As many as 17 particles fragment the type of microplastic that dominates. The dominant color is blue. The highest total abundance of microplastics was found at station 6, as much as 35.1 particles/kg with different densities of seagrass species at each station. The density of seagrass species itself reaches the range of 1.2 stands/m2
Pemodelan Kekuatan Gelombang di Pesisir Barat Kecamatan Kuta, Bali Timothy Kenoly; I Gede Hendrawan; I Gusti Ngurah Putra Dirgayusa
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i01.p06

Abstract

The coastal area is an important area with many different functions for both human and marine organisms. Still, coastal regions are vulnerable to changes caused by various things, including waves. Waves can cause shoreline changes and erode coastal regions. Kuta District is one of the coastal areas on the island of Bali that are threatened with constant sediment erosion every year. One way to increase understanding of the wave and its effect on the coastal areas is through numerical modeling. This study aimed to determine the pattern of wave and wave strength distribution on the west coast of the Kuta district. The Finite Volume Coastal Ocean Model and SWAVE (FVCOM-SWAVE) coupling model that was used in this study utilized the Finite Volume method of computation with the unstructured triangular grid. The results showed that in West Season (December-January-February), the range of mean significant wave heights on the west coast of Kuta District is 0.05 - 0.2 m, and the wave power ranged from 1 to 30 W/m with the most considerable value of significant wave heights and wave power were encountered in January. Water areas near land have greater wave heights and wave power than areas far from land, except around Ngurah Rai International Airport. The movement of waves primarily comes from the southwest, the Bali Strait, to the east and is divided by the runway into following the northern and southern parts of the coast. Thus, the most significant wave height ??and wave power values are found in the waters near Kuta beach and Legian beach.
Konsentrasi Makroplastik Pada Ekosistem Terumbu Karang Di Perairan Pesisir Pemuteran Dan Padang Bai I Putu Trisna Buana Putra; I Gede Hendrawan; I Wayan Gede Astawa Karang
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i01.p02

Abstract

Marine debris can be a severe problem in the coastal areas and small islands of Indonesia, which are the habitat of marine organisms and their ecosystems. This is, of course, related to unmanaged waste in various provinces in Indonesia, such as the Bali Province, where as much as 52% of waste in Bali needs to be appropriately managed. Marine debris can be generated from various activities on land and at sea, such as residential areas, industrial activities, offshore activities, and other activities on the island of Bali. The waters of Pemuteran and Padang Bai have coral reef ecosystems. Coral reefs function as a food warehouse for fisheries, a place to live and spawn, and physically coral reefs function as breakwaters and beach protectors. Marine debris can harm coral ecosystems, where it can cause scratches, shards, and disease to corals. This study aimed to analyze macroplastics' characteristics, concentration, and potential relationship to coral reefs. The macro plastic survey used an adaptation of the CSIRO method. The results of this study indicate that the macro plastic characteristics found in the Pemuteran waters were soft plastic types with concentration values ??ranging from 0.02 to 0.03 pieces/m2. In contrast, there were fiber, soft plastic, and hard plastic types with higher concentration values in the Padang Bai waters. Ranged from 0.09 to 0.12 pieces/m2. The ratio of macroplastic to the percentage of live coral cover is 0.98, which means it is inversely proportional; if the amount of macroplastic increases, it will decrease the percentage of live coral cover. The effect of microplastic on the percentage of live coral cover was very significant, with a determination value of 0.96.
Studi Laju Sedimentasi di Muara Sungai Perancak Menggunakan Pemodelan Numerik Pandu Pratama Putra; I Wayan Arthana; I Gede Hendrawan
Journal of Marine Research and Technology Vol 6 No 2 (2023): AGUSTUS 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i02.p11

Abstract

Perancak is an estuary area with land use in mangroves and ponds. Land changes that have occurred at the Perancak River estuary and tidal flooding in recent years have increased the potential for sedimentation problems that can cause silting of the riverbed. This study aims to determine the sedimentation rate and identify the potential for siltation in the estuary of the Perancak River. Sediment modeling uses the Finite Volume Coastal Ocean Model (FVCOM) by entering primary and secondary data such as bathymetry, tides, temperature, salinity, river discharge, sediment type, and Total Suspended Solid (TSS) concentration. Modeling for 33 days (January - February 2022). The results showed that the sedimentation rate in the Perancak River estuary ranged from 0.25 to 18.8 kg/m2/day, with an average of 3.83 kg/m2/day. Sedimentation rates are high in the estuary areas and riverbanks bordering the mainland. The potential for siltation shows that it occurs at river mouths with a silting value of about 0.01 m/year to more than 0.05 m/year.
Studi Potensi Tsunami Bali Utara Menggunakan Metode Numerik Idam Bali Haryono; I Gede Hendrawan; Gede Surya Indrawan
Journal of Marine Research and Technology Vol 6 No 2 (2023): AGUSTUS 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i02.p02

Abstract

Bali Island is one of the most tsunami-prone areas in Indonesia. Two tectonic tsunami sources flank Bali Island: The Megathurst subduction zone in the south and the Back Arc Thurst subduction zone in the north. This study aimed to add information about the tsunami arrival time and the maximum height of the tsunami waves that hit the coast using COMCOT software as a disaster mitigation measure. Five scenarios were used in this study with the differences in the magnitude of tsunami-generating earthquakes. Results showed that the fastest affected shoreline by the tsunami in scenarios 1, 2, and 3 is the Tejakula Sub District shoreline, with a period of 5 minutes 41 seconds to 3 minutes 43 seconds. In scenarios 4 and 5, it was found on the Sawan Sub District shoreline for 2 minutes, 51 seconds to 56 seconds. The maximum run-up of tsunami waves that hit the shoreline in scenarios 1, 2, 3, and 4 are on the Kubu Sub District shoreline with run-up heights of 0.0095 m, 0.47 m, 1.5 m, and 3 m. In scenario 5, the highest run-up is on the Banjar Sub District shoreline, with a 67.6 m run-up height. Based on the results of this study, it can be concluded that the magnitude of the tsunami-generating earthquake greatly influences the travel time and run-up height of the tsunami waves. The greater the magnitude of the tsunami-generating earthquake, the faster the travel time of the tsunami waves and the higher the run-up height.
Kandungan Mikroplastik Pada Gastropoda di Kawasan Tahura Ngurah Rai, Bali Gulielmus Nanda Iobel Arijuato; I Gede Hendrawan; I Putu Yogi Darmendra
Journal of Marine Research and Technology Vol 6 No 2 (2023): AGUSTUS 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i02.p05

Abstract

The mangrove ecosystem can be affected by the dangers of microplastics, indicated by various associated biota that lives in it, one of them being gastropods. This study aimed to determine microplastics’ content in gastropod body mangrove sediments at Tahura Ngurah Rai, Bali using gastropods as bioindicators. This research was conducted from May to June 2022, using in situ and ex situ methods. In situ, data were conducted at Tahura Ngurah Rai, Bali, as the sampling location, and ex situ data were conducted at Udayana University’s marine science laboratory by sample processing. The data taken includes the characteristics of microplastics, including the type, size, color, and abundance of microplastics in gastropods at the sampling station. Results showed that 5 families of gastropods (Ellobiidae, Littorinidae, Muricidae, Neritidae, and Potamididae) were contaminated with microplastics, with the highest abundance found in Potamididae, with the number 4,06 ± 2,19 particles/individual. The types of microplastics obtained were fragments, fibers, and films dominated by fibers collected 210 particles. The color of the microplastics varies and dominated with black colored microplastics was found 78 particles, and the size of microplastics is dominated by < 1 mm particles with several 145 particles. The highest abundance of microplastics was found on site 12 with the number 5,67 ± 4,04 particles/individual.
OIL SPILL SIMULATION IN THE BALI STRAIT USING THE GNOME AND FVCOM MODELS ON EASTERLY SEASON Putu Hadi Wiguna, Pande; Hendrawan, I Gede; Osawa, Takahiro
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 17 No 2 (2023)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2023.v17.i02.p10

Abstract

Among several forms of marine pollution, oil damages coastal ecosystems. Repeated reports of oil contamination in the marine environment can partly load with major shipping lines. The Ketapang-Gilimanuk crossing over the Bali Strait is Indonesia's second busiest ferry port after Merak-Bakauheni. The most congested shipping routes can carry a significant risk of environmental damage from an oil spill. Oil spill trajectory modelling is carried out to reduce the impact of this possible disaster. Therefore, the use of modelling to ascertain the route of the oil spill was considered. The oil leak path is simulated using the GNOME model. Two oil spill scenarios were used as input models. The chosen location is around the Ketapang Gilimanuk crossing, as well as the time of the easterly season. An ocean HF radar stationed in the Bali Strait verifies the accuracy of the current marine data generated by FVCOM. To see the pattern of the oil spill trajectory based on a ten days simulation, we combined the latest data from FVCOM with GNOME. To determine the ability of the model to predict the flow and trajectory of oil spills in the Bali Strait, this study try to analyze and interpret the oil spill trajectory from model and then validate the model results with satellite imagery. Keywords: Bali strait; oil spill; trajectory; GNOME; FVCOM; HF Radar
PENGARUH MODEL PEMBELAJARAN SAVI BERBASIS MIND MAPPING TERHADAP MOTIVASI BELAJAR IPS DI SD ., Gede Hendrawan; ., Drs. I Made Suarjana, M.Pd; ., Dra. Ni Wayan Arini, M.Pd.
MIMBAR PGSD Undiksha Vol. 6 No. 1 (2018): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpgsd.v6i1.12921

Abstract

Penelitian ini bertujuan untuk mengetahui perbedaan motivasi belajar IPS antara siswa yang dibelajarkan menggunakan model pembelajaran SAVI berbasis mind mapping dan pembelajaran tanpa menggunakan model pembelajaran SAVI berbasis mind mapping pada siswa kelas V SD di gugus V Kecamatan Buleleng, Kabupaten Buleleng. Sampel penelitian ini yaitu siswa kelas V SDN 1 Petandakan sebagai kelas ekperimen dan SDN 1 Sari Mekar sebagai kelas kontrol. Pengumpulan data penelitian ini menggunakan instrumen kuisiooner motivasi belajar. Data yang dikumpulkan dianalisis menggunakan analisis statistik deskriptif dan statistik infrensial (uji-t). Hasil penelitian ini menemukan bahwa terdapat perbedaan motivasi belajar IPS yang signifikan antara kelompok yang dibelajarkan menggunakan model pembelajaran SAVI berbasis mind mapping dan siswa yang dibelajarkan tanpa menggunakan model pembelajaran SAVI berbasis mind mapping (thitung=10311>ttabel=2018) artinya thitung lebih besar daripada ttabel yang menunjukkan adanya perbedaan yang signifikan. Perbandingan hasil penghitungan rata-rata nilai motivasi belajar IPS siswa yang mengikuti pembelajaran menggunakan model pembelajaran SAVI Berbasis mind mapping 121,88 sedangkan siswa yang dibelajarkan tanpa menggunakan model pembelajaran SAVI berbasis mind mapping 103,30. Ini berarti bahwa penggunaan model pembelajaran SAVI berbasis mind mapping berpengaruh terhadap motivasi belajar IPS siswa kelas V SD di gugus V Kecamatan Buleleng tahun pelajaran 2016//2017.Kata Kunci : SAVI, mind mapping, motivasi belajar This study aims to determine the difference in motivation of IPS learning between students who were taught using SAVI based learning model of mind mapping and learning without using SAVI based learning model mind mapping on students of class V SD in Gugus V Buleleng District, Buleleng Regency. The sample of this research is students of class V SDN 1 Petandakan as an experimental class and SDN 1 Sari Mekar as a control class. The data collection of this research using questionnaire instrument of learning motivation. The data collected were analyzed using descriptive statistical and statistical analyzes (t-test). The results of this study found a significant difference in learning motivation between IPS learning groups using SAVI learning model based on mind mapping and students who were taught without using SAVI learning model based on mind mapping (tCount=10311>ttable=2018) that is tcount bigger than ttable Which indicates a significant difference. Comparison of calculation result of mean value of learning motivation of IPS students following learning using SAVI based learning model mind mapping 121,88 while the students who were taught without using SAVI based learning model mind mapping 103.30. This means the use of SAVI-based learning model of mind mapping learning motivation of IPS students in grade V elementary school in gugus V Buleleng sub-district in the academic year 2016/2017.keyword : SAVI, mind mapping, learning motivation
Co-Authors Alan Frendy Koropitan Alexis Chappuis Andrianus Sembiring Ariandini, Yovita Astaman, I Dewa Made Khrisna Putra Astiti Ratnasari Astiti Ratnasari Bambang Sukresno Bambang Sukresno Brasika, Ida Bagus Mandhara Candra Saputra Cok Istri Yudhantari Devi Ulinuha Diana Paramita Ratnawati Dika Madyawan Elitza Germanov Elok Faiqoh Elok Faiqoh Eriq Imanuel Felixita Abigael Raintung Fernandes Flaviana Pinto Fitra Cahya Prima Fumihiko Nishio Gede Indra Putra Pratama Gede Surya Indrawan Gulielmus Nanda Iobel Arijuato Hasanuddin Parulian Sihombing Herlambang Aulia Rachman Hery Suyanto Hesti Aprianti I Dewa Nym. Nurweda P., I G. A. Widagda I Gede Dananjaya Bagaskara I Gede Surya Risuana I Gusti Bagus Sila Dharma I Gusti Ngurah Agung Dhananjaya I Gusti Ngurah Putra Dirgayusa I Kadek Yogi Wiantara I komang Ardana I Made Dharma Raharja I Made Kertayasa I Made Suarjana I Putu Ranu Fajar Maharta I Putu Ranu Fajar Maharta I Putu Trisna Buana Putra I Putu Yogi Darmendra I W BUDIARSA SUYASA I Wayan Arthana I Wayan Arthana I Wayan Gede Astawa Karang I Wayan Matsya Deva Nagendra I Wayan Nuarsa I Wayan Nuarsa I Wayan Sandi Adnyana Ida Bagus Alit Paramarta Ida Bagus Andika Putra Ida Bagus Mandhara Brasika Idam Bali Haryono Ira Fitriana Jajang Nuryana Janis Khansa Putri Argeswara Jefry Cristian Bulan Josaphat Tetuko Sri Sumantyo Koji Asai Koji Asai Komang Ardana Komang Bayu Permana Komang Indah Vitri Lestari Kuncoro Teguh Setiawan Luh Made Chandra Luh Made Chandra Luh Pt Priyandayani Made Narayana Adibhusana Nanin Anggaraini Ni Luh Astria Yusmalinda Ni Luh Gede Desy Suryaningsih Ni Luh Gede Rai Ayu Saraswati Ni Luh Novita Aryanti Ni Luh Novita Aryanti Ni Luh Putu Bintang Witariani Ni Luh Putu Febbi Mellani Ni Luh Putu Ria Puspitha Ni Luh Watiniasih Ni Made Dewi Damayanti Ni Nyoman Raka Wulandari Ni Putu Sri Ayuni Ni Wayan Arini Ni Wayan Meri Monika Sari Ni Wayan Sukma Taraning Rahayu Nikita Ribka Kawung Pandu Pratama Putra Putra Bagus Panji Pamungkas Putra, I Nyoman Giri Putu Bagus Angga Utama Putu Edi Yastika Putu Hadi Wiguna, Pande Risuana, I Gede Surya Rizaldi Cahya Bramasta Samantha Julia Blandina Lumban Tobing Saraswati, Ni Luh Gede Rai Ayu Sartika Ristama Silitonga Sukarasa, I Ketut Susumu Kanno Susumu Kanno Takahiro Osawa Timothy Kenoly WAYAN SANDI Widiastuti Karim Widiastuti Widiastuti Yasa, Putu Kumara Yasuhiro Sugimori YASUHIRO SUGIMORI Yasuhiro Sugimori YASUHIRO SUGIMORI Yasuo Furushima Yasuo Furushima Yesie Rahayu Ananingtyas Yulianto Suteja