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Journal of Marine Research and Technology
Published by Universitas Udayana
ISSN : 26210088     EISSN : 26210096     DOI : 10.24843/JMRT
Core Subject : Science,
Earth & Planetary Sciences
The Journal of Marine Research and Technology (JMRT) (p-ISSN 2621-0088 | e-ISSN 2621-0096) is an open access, scientific journal that aims to publish the dynamic of the coastal and ocean, its ecosystems and coastal environment, and Observation technology. JMRT is a peer-reviewed journal publishes original articles and critical reviews of current issues in marine science and technology. The range of topics extends from research in Oceanography, marine habitats, living resources, management and conservation issues related to the marine resources. This includes remote sensing, ocean modelling, geographic information System (GIS), coastal engineering, coastal processes, marine instrument, ecology, genetics, marine pollution, fisheries, marine ecotourism, and it's economic and social. JMRT provides a forum for the discussion and sharing all the latest issues in marine research and technology. Editorial manager system is an online manuscript submission, review and tracking system. JMRT is issued twice a year, each February and August.
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Articles 12 Documents
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Search results for , issue "Vol 6 No 2 (2023): AGUSTUS 2023" : 12 Documents clear
Keanekaragaman Iktiofauna Ekosistem Estuari Taman Hutan Raya Ngurah Rai, Bali Gabrielle Aisya; Nyoman Dati Pertami; I Nyoman Giri Putra
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.p01

Abstract

The diversity of ichthyofauna is an important aspect that can be used to presume the aquatic environmental conditions. Therefore, this study aims to determine the diversity of ichthyofauna in Taman Hutan Raya (TAHURA) Ngurah Rai, Bali during the eastern season and transitional II season. The sample was collected from July 2022 – October 2022 using an experimental gill net. During the sampling period of this study, 413 fishes were caught, representing 18 different species from 17 genera, 14 families, and 12 orders. Based on the results of the analysis, the highest diversity value was found in the waters of Jimbaran, then the waters of Kampung Kepiting, while Serangan waters has the lowest diversity value (H’<1). The lowest uniformity index was found in the waters of Serangan because it is dominated by only one fish species, namely Ambassis macracanthus (Seriding Fish), while in the waters of Kampung Kepiting and Jimbaran, the uniformity is quite even. The highest dominance index was found in the waters of Serangan, while other water areas has no dominating species. The species composition found at all stations varied considerably, but the results of the IUCN status showed that most of the fishes were still in the category of data deficient and not evaluated. The highest abundance was found in the waters of Serangan. The water quality parameters of TAHURA Ngurah Rai showed that not all aspects are in accordance with quality standards for marine life.
Pemetaan Zona Potensial Penangkapan Ikan (ZPPI) Di Perairan Selat Bali Menggunakan Citra Satelit Aqua MODIS Ni Kadek Ayu Dwi Lestari; I Dewa Nyoman Nurweda Putra; Ni Luh Putu Ria Puspitha
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.p06

Abstract

The abundance and distribution of fish are influenced by environmental productivity, such as chlorophyll-a distribution and variations in sea surface temperature (SST). The lack of technology fishermen use in the waters of the Bali Strait has resulted in the high potential of fish resources not being optimally utilized. This study aimed to determine potential fishing zones by utilizing Aqua MODIS satellite data which can detect SST and chlorophyll-a. The image data observed was from October to December 2018 to 2020. The method used is the Single Image Edge Detection Algorithm, where this algorithm is used to determine potential fishing areas designed to detect fronts in SST images. The results showed that in December 2018, 7 potential fishing points were produced, marked with a chlorophyll-a value of 0.25 mg/m3 and an SST of 29.25°C. In December 2020, 82 potential fishing points were produced, with a chlorophyll-a value of 0.31 mg/m3 and an SPL of 29.79°C. Validation was carried out by analyzing the result of image processing with fish catch data obtained from Pengambengan PPN, Muncar PPP, and Kedonganan TPI. SST, with a value of 27°C, is the ideal temperature for fish where when the temperature increases, the number of potential fish catch points decreases and vice versa. The distribution of chlorophyll-a content with a value of > 0.2 mg/m3 affects the number of potential fishing points, where the higher the chlorophyll-a content, the more fishing ground points and vice versa.
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.
Penilaian Kondisi Komunitas Mangrove di Kawasan Hutan Mangrove Ciletuh, Sukabumi, Jawa Barat Muhammad Imran Zaelani; I Wayan Arthana; 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.p07

Abstract

This study aimed to analyze the composition of mangrove vegetation, the Important Value Index (IVI) of mangroves, the condition of the mangrove community (mangrove density and mangrove canopy cover), and environmental parameters as supporting data in the Ciletuh Mangrove Forest Area, Sukabumi, West Java. The research method used in this research is a quantitative descriptive method. The number of stations determined is four; each observation station is made of a plot of 10 x 10 meters, with three plots for each station. The results found seven mangrove species, namely Avicennia marina, Bruguierra cylindrica, Rhizophora apiculata, Rhizophora mucronata, Aegiceras corniculatum, Hibiscus tiliaceus, and Nypa fruticans. The mangrove species found were dominated by A. marina, where this species was found at all stations and had the highest Important Value Index (IVI) value among other species, ranging from 88.96 - 195.55%. Mangrove communities in the Ciletuh Mangrove Forest Area are in good condition referring to the Decree of the Minister of Environment No. 201 of 2004 concerning Standard Criteria and Guidelines for Mangrove Damage with density values ranging from 1533 – 2933 stands/ha and the percentage of mangrove canopy cover ranging from 80.54 - 82.22%.
Pemetaan Batimetri Perairan Dangkal Menggunakan Citra Satelit Sentinel-2a Dan Landsat 8 Perairan Pantai Matahari Terbit, Bali Ravienkha Raishasaras Budaya; I Gusti iNgurah Putra Dirgayusaa; 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.p12

Abstract

Bathymetric mapping has an important role for human activities, especially in the marine and fisheries field. However, conventional measurement of bathymetry in coastal areas is quite time consuming, high cost and difficult ship access. With the advancement of current technology, remote sensing technology using satellite imagery is believed to overcome these obstacles. In practice, there are several satellite imagery that can be used, with its own advantages and disadvantages that differ from each other. This study compared two open access satellite imagery with different resolutions Sentinel-2A and Landsat 8 by applying Lyzenga’s algorithm to estimate depth in Matahari Terbit Beach Waters, Bali. The depth data estimated from these satellites imageries then validated with in situ measurement data collected in November 2012. To obtain the absolute depth and know the relation between the relative depth of the image and the in situ depth is carried out Inverse regression analysis. The results of the analysis using Sentinel-2A obtained an estimated absolute depth of 0 – 7.1 meters with R2 = 0.705 and RMSE 6.165324. While the analysis using Landsat 8 obtained an estimated absolute depth of 0 – 5.5 meters with R2 = 0.588 and RMSE 7.086484. The results showed that the data obtained using Sentinel-2A satellite imagery was better than Landsat 8’s imagery, which could be due to differences in image spatial resolution and water conditions when the images were recorded.
Kajian Karakteristik Gelombang Laut di Wilayah Pantai Pulau Merah, Kabupaten Banyuwangi Anggareta Khairunnisa; Aries Kristianto
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.p03

Abstract

Sea wave parameter information is used in maritime-related activities such as sea transportation, offshore exploration, fisheries, port construction, shipping safety, coastal area development, and coastal mitigation. This study described the characteristics of the sea waves in Pulau Merah Beach, Banyuwangi Regency. Wind reanalysis data of 10 meters was processed using the Sverdrup Munk Bretschneider (SMB) method using the Easywave algorithm. The analyzed and processed the sea wave model's assimilation data from Marine Copernicus pointwise by WRPLOT. The results of wind and ocean wave data processing showed that the direction, height, and period of sea waves on Pulau Merah Beach are strongly influenced by the Monsoon Wind. The sea wave height in the Pulau Merah Beach region reaches its peak value during the East season, which is 1.5 meters. In contrast, the value of the period of sea waves in the Pulau Merah Beach area reached its peak value during the Transitional Season I period, which was 8.3 seconds.
Frekuensi Pemunculan, Tingkah laku, dan Diversitas Cetacea di Perairan sekitar Labuan Bajo, Flores, Nusa Tenggara Timur Priscilla Princessa Amalo; I Dewa Nyoman Nurweda Putra; I Nyoman Giri Putra
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.p08

Abstract

At least 30 cetaceans live in Indonesia, especially in the eastern waters of Indonesia, consisting of whales and dolphins. Cetaceans play an important role as a key species in determining the health of marine ecosystems. This study aims to determine the frequency of appearance, behavior, and diversity of cetaceans along Labuan Bajo, Flores, and East Nusa Tenggara. The study was conducted in October-November 2021, with four weeks to collect field data and interviews. The data involved a ship carrying a group of observers consisting of four people, with each task assigned to look for the appearance, species, and behavior of cetaceans. In the interview methods, interviews were conducted with fishermen regarding the presence of cetaceans. The data was then processed using the Microsoft Excel program and later plotted using the ArcView program as the outpour of the cetacean distribution. The results showed 19 occurrences of cetaceans, with six occurrences found in the field survey and 13 based on interviews with fishermen. Appearances were found to be evenly distributed in the study area, with a total of 7 species of cetaceans found, namely Stenella longirostris, Stenella attenuata, Tursiops truncates, Pseudorca crassidens, Grampus griseus, Kogia simus, and Physeter macrocephalus. In species composition and abundance, S. longirostris species had the highest value, and the P. crassidens species had the lowest composition value. A value of 1.06 was found in diversity, indicating that the cetaceans in Labuan Bajo were classified as moderate. Some behaviors include aerials, spy hopping, bow-riding, feeding, and avoidance.
Indeks Kesesuaian Wisata Di Pantai Pemuteran Buleleng, Bali I Kadek Aldi Wahyu Andika Maha Putra; I Gusti Ngurah Putra Dirgayusa; I Gusti Bagus Sila Dharma
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.p04

Abstract

Marine ecotourism is one way of developing tourism in coastal areas that pays attention to ecology and maintains environmental stability. This study was conducted to determine the value of the Tourism Suitability Index (IKW) at Pemuteran Beach, Grokgak, Buleleng by considering 10 parameters such as water depth, beach type, beach width, water base material, water current velocity, beach slope, water brightness, coastal land cover, hazardous biota, and freshwater availability. The method of determining the location using the purposive sampling method is by taking an intentional and determined sample so that what you want to study can be represented by the number of stations, as many as 4 station points. The IKW analysis in this study refers to the suitability classification of coastal tourism and the tourism suitability matrix. Based on the results of the IKW analysis at Pemuteran Beach, each station, namely Station I has a value of 77%, station II is 79%, station III is 83%, and Station IV is 82%. It has the type and basic material of the beach with a black sand substrate with a mixture of coral fragments with a depth of 1.55-1.7 m; including shallow waters, the average width of the beach is quite wide, which is 11.5 m. In addition to this, Pemuteran Beach has a coastal slope of less than 10o with an average current speed of 0.27 m/s and has 100% water clarity. Coastal land cover is generally in the form of resident settlements.
Aplikasi Penginderaan Jauh Citra Landsat-8 Untuk Pembuatan Peta Batimetri Di Perairan Pantai Jumpai, Klungkung, Bali Ida Ayu Made Inten Melinia; I Dewa Nyoman Nurweda; I Gusti Ngurah Putra Dirgayusa
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.p09

Abstract

Klungkung Regency is the smallest regency in the province of Bali, Indonesia. The waters of Jumpai Beach are one of the areas in Klungkung, which is one area that is used by the surrounding population for fishing activities for fishermen to obtain fishery products. Remote sensing technology has been applied because of its effectiveness and the significance of its use in compiling and revising resource maps. It is also helpful to support resource planning and management. A bathymetry map is a map that describes the depth of the sea and is presented using contour lines. Contour lines are abstract lines connecting several locations or areas with the same height or depth. Remote sensing techniques are available to determine the ocean’s depth because the air has signals from the very bottom of the ocean with strong solid wavelengths. However, the penetration of electromagnetic energy is limited. Therefore, remote sensing techniques are adopted to infer water depth and shallowness. One of the satellites that can be used for bathymetry mapping is Landsat-8. Landsat imagery has a spatial resolution of 30 meters, complemented by the visible channels required to extract bathymetric maps. Accurate estimation of shallow water area bathymetry for the safety of small boat navigation such as fishing and for benthic studies. Remote sensing technology can be considered one of the most desirable alternative tools for bathymetry development.

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