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I Gusti Bagus Sila Dharma
Fakultas Kelautan Dan Perikanan Universitas Udayana
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Struktur Komunitas Makrozoobenthos di Ekosistem Mangrove Pulau Serangan Bali I Ketut Dedi Ariawan; I Gusti Bagus Sila Dharma; Elok Faiqoh
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p11

Abstract

Macrozoobentos are organisms that live at the base of the water (Epifauna) or in the substrate (Infauna) with a size greater than 1 mm. Macrozoobenthos play an important role in the process of decomposition of organic matter in the sediment in the mangrove ecosystem. This research was conducted in August 2018 in the mangrove areas of Serangan Island, Bali. This research has purpose to know the structure of the Macrozoobenthos community in the mangrove ecosystem. It using a purposive sampling method, which consists of 2 stations, located in the north (adjacent TPA Suwung) as station 1 and on the south (directly facing the sea) as station 2. Each station consists of 5 substations with the distance between the substations adjusted to the condition of the existing mangrove community and each substation has 3 plots with a distance between the plot 10 m. The transect is drawn towards the sea for 50 m. The results obtained at station 2 had higher abundance of macrozoobenthos than Station 1, his shows the condition of the substrate at station 2 it supportive for the survival of macrozoobenthos organisms. The difference in the substrate in each station is thought to be one of the factors that influence the difference in macrozoobenthos density. At stations 1 and 2 have medium diversity, high Eveness and low dominance. This shows that the macrozoobenthos community in the mangrove ecosystem in the north and south of Serangan Island is in a stable condition but if the environment experiences a change, the change will affect the structure of the macrozoobenthos community in the ecosystem environment so that the value of species diversity is at a medium level.
APLIKASI MOVING BED BIOFILM REACTOR (MBBR) DENGAN MEDIA BAMBU UNTUK MENGURANGI KADAR PENCEMARAN AIR SUNGAI (STUDI KASUS ANAK SUNGAI MUDING KAJA) Dewa Arya Dwiyana; I Wayan Suarna; I Gusti Bagus Sila Dharma
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.p06

Abstract

Changes in the function of land on the riverbanks into residential areas have triggered a large amount of organic material that enters into river water, causing river water to degradation in quality. If we ignored this, it will trigger the growth of pathogenic bacteria that endanger human life. One alternative way to overcome the degradation in river water quality due to increased organic material is using the MBBR method with bamboo as its media. This one of method that uses the growth of bacteria attached to the media to reduce the organic material content in river water. The purpose of this experiment was to determine the effect piece of bamboo media and the biggest effectiveness value of reducing BOD and COD levels in Muding Kaja tributary water with a determined of filling ratio, dissolved oxygen and detention time. The results show that the highest effectiveness using the MBBR method with bamboo media can reduce BOD level until 90,946 % with filling ratio 30% and time detention as long 5 hours and reduce COD level until 30,435 % by using filling ratio 30% and time detention for 5 hours. From this research we can conclude that MBBR method using bamboo as media affected to reduce BOD5 dan COD level. MBBR Method very efffective to reduce BOD5 level and less effective to reduce COD level in water river. Keywords: River water pollution, Moving Bed Biofilm Reactor, Bamboo media, Effectiveness
Analisis Sea Level Anomaly Dengan Menggunakan Data Multi Satelit Altimetri Di Perairan Indonesia I Gusti Putu Ary Wedangga; I Gusti Bagus Sila Dharma; I Dewa Nyoman Nurweda Putra
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p14

Abstract

Global warming become one of the problems currently faced by the world. In general, global warming is a phenomenon where the average temperature of the earth has increased, both the temperature of land, atmosphere, and sea. As a result, global warming can cause global climate change, and sea level rise. Sea level rise is a condition where the increasing of sea water volume that caused by melting of the ice caps or thermal expansion. This study used Sea Level Anomaly (SLA) dan Sea Surface Temperature (SST) data with 1/4° x 1/4° spatial resolution and daily temporal resolution for 10 years (2008 - 2018). The study was conducted in Indonesian waters within coordinates of 10°N – 13°S dan 93°E – 141°E, with 8 areas focused on analyzing sea level anomaly trends. During the period 2008 - 2018 there was a positive trend of sea level anomaly at all research area. The highest sea level rise occurred in area B (Sulawesi Sea) of 4.788 cm with a rate of increase of 0.479 cm / year. In general there was an average increase of 3.686 cm in Indonesian waters with a rate of increase of 0.369 cm / year.
Pemetaan Tingkat Kerawanan Bencana Tsunami di Pesisir Barat Daya Provinsi Banten Elizabeth Anastasya; I Dewa Nyoman Nurweda Putra; IGB Sila Dharma
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p10

Abstract

Indonesia is one of the countries that has a high level of natural disasters in the world because of Indonesia's location and geographical position in the rings of fire. One of the most vulnerable disasters in Indonesia is earthquakes, volcanic eruptions to tsunami waves (Mukhtasor , 2007). Based on data from the BNPB on December 22 2018, there was a tsunami disaster in the southwest coast of Banten to the coast of Lampung caused by the eruption of Mount Anak Krakatau. The purpose of this study are to create tsunami hazard map on the southwest coast of Banten Province by using a Geographic Information System (GIS) and then identify which areas are in a very vulnerable class. This research was conducted in February 2020 until May 2020. The analytical method used was descriptive analysis, map overlay analysis, and qualitative analysis. The stages include the preparation of maps and supporting data using the help of Global Mapper 8.0 software, the determination of influential parameters, analysis of tsunami prone areas based on the parameters that affect, and determination of tsunami prone areas. The process of determining tsunami-prone areas is done through a process of weighting and scoring of influential parameters, then overlapping with the help of ArcGis 10.7 software to get a map of the level of tsunami hazard. The factors in this study that affect tsunami hazard are land height, land protection, distance from the tsunami source, coastline shape, and the presence of barrier islands. The total area classified as very vulnerable is around 19,94 km2 on the southwest coast of Banten Province. This indicates the need for disaster management through crisis management and risk management based on more valid research.
Studi Laboratorium Bangunan Pantai Untuk Mereduksi Gelombang Tsunami Kasus Palu, Sulawesi Tengah Yolla Jessika; IGB Sila Dharma; I Gusti Ngurah Dirgayusa; Adi Prasetyo
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p16

Abstract

Indonesia ranked second as the country most frequently hit by tsunamis, earthquakes large and small often occur in Indonesia. The earthquake in Palu-Donggala, Central Sulawesi in 2018 with a magnitude of 7.4 had generated a tsunami as high as 3-5 m, and the epicenter was in the north of the bay which resulted in the death toll and the destruction of infrastructure. In minimizing losses and casualties, structural disaster mitigation in the form of coastal buildings consisting of mangroves and vegetation as natural protection and sea walls as coastal reinforcement can be the right step to anticipate the vulnerability of the Palu Bay area. This study aimed to analyzed the level of attenuation in coastal structures and determine the best alternative for tsunami disaster mitigation planning. The test was carried out with a physical model using (wave flume) at the Balai Pantai Laboratory with a total of 48 times of testing with variations of three wave generation targets (0.07 m, 0.09 m, and 0.11 m), depth (0.40 m, 0.414). m, and 0.428 m) and the width of the vegetation (0.40 m, 0.70 m, and 1 m) which are divided into 24 scenarios. The results of the physical model test showed that the presence of coastal structures has a significant effect on the characteristics of the transmission waves, and the speed. The existence of mangrove forests and vegetation has succeeded in reducing wave transmission by 20-100%, also being able to reduce wave speed up to 100% significantly in the relative water level (Mean Water Level), reducing up to 87% at average elevation (Sea Water Level) ), and reduce up to 22% at the highest tide state (High Water Level).
Pendugaan CPUE (Catch Per Unit Effort) dan Potensi Maksimum Lestari Ikan Lemuru (Sardinella lemuru) yang Didaratkan di PPN Pengambengan, Jembrana-Bali I Gusti Bagus Ngurah Adywan Surya Bhuwana; IGB. Sila Dharma; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p17

Abstract

Lemuru is one of the highest catches landed in PPN Pengambengan. PPN Pengambengan is a strategic fishery port owned by Jembrana with a function as a center or center for marine fisheries landing. Improvement of fishing technology will be related to the problem of abundance or availability of fishery resoure stocks, so it is necessary to study CPUE, MSY and JTB so that they can utilize the resources with optimal but still maintain its preservation in nature. This research has a purpose, which is to know the tren of CPUE, MSY and JTB of lemuru fish (Sardinella lemuru) landed in PPN Pengambengan. The method used is a quantitative descriptive method using a surplus production analysis from Schaefer. The data used in this study are catch and fleet data from 2014–2019 obtained directly from the PPN Pengambengan office. The results showed the highest CPUE in 2015 amounted to 6,15 tons/fleet, but after that the CPUE tren tended to decline, especially since 2016 while the MSY value was obtained at 9.598,49 tons/year with a maximum sustained effort of 4.545,45 fleets/year. Furthermore, the JTB value is 80% of the MSY value, a figure of 7.678,8tons/year is obtained. This indicates overfishing and over-exploitation in the PPN Pengambengan area. To prevent overfishing and over-exploitation, prevention can be done, such as limiting fishing capacity and effort can also apply fisheries management models, such as co-management and EBFM (eco-based fisheries management).
Struktur Komunitas Makrozoobenthos Pada Daerah Pasang Surut Di Zona Pemanfaatan Taman Hutan Raya (Tahura) Ngurah Rai, Desa Pemogan, Suwung Kauh, Denpasar Putu Eva Setiawati; I Gusti Bagus Sila Dharma; Elok Faiqoh
Journal of Marine and Aquatic Sciences Vol 9 No 2 (2023)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2023.v09.i02.p03

Abstract

The mangrove ecosystem lives along the coast and influenced by tidally process. The mangrove ecosystem has many functions and associated with different types of biota, one of them is macrozoobenthos. Macrozoobenthos is organism that live at the bottom of the substrate. This study aims to determine the community structure of macrozoobenthos and the influence of physic-chemical sediments parameters (temperature, salinity, pH nitrates and phosphates) of the abudance of macrozoobenthos in the Using Zone Taman Hutan Raya (Tahura) Ngurah Rai, Pemogan Village, Denpasar. Data analysis using by Bray Curtis index to see the similarity between the stations and Principal Component Analysis (PCA) to see the parameters that influence the abundance of macrozoobenthos. Result showed that the diversity index of macrozoobenthos is low - medium, Eveness index is low - high and Dominance index is medium-high. The highest similarity is between station 3 and 4, while station 1 has no similarity with other. PCA analysis showed that abundance of macrozoobenthos was influenced by temperature, salinity, nitrate, and phosphate.
THE FUNCTION OF NDWI AND NDTI IN DIFFERENTIATING THE CHARACTERISTICS OF WATER AREAS BASED ON SENTINEL 2 IMAGERY Astiti, Sagung Putri Chandra; Dharma, I Gusti Bagus Sila; Pariartha, I Putu Gustave Suryantara; As-Syakur, Abd. Rahman
Jurnal Sains Riset Vol 14, No 2 (2024): September 2024
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Jabal Ghafur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47647/jsr.v13i2.2640

Abstract

Penggunaan teknologi penginderaan jauh dengan data citra satelit sebagai media utama telah banyak digunakan dalam menganalisis data yang diperoleh menggunakan alat tanpa kontak langsung dengan objek, fenomena, atau area yang sedang dipelajari. Salah satu data citra satelit yang dapat diakses secara gratis dan resmi adalah data citra Sentinel-2 MSI (Multi-Spectral Instrument), yang merupakan data yang dikembangkan oleh Badan Antariksa Eropa (ESA). Data citra Sentinel-2A yang digunakan dalam penelitian ini terbagi menjadi 2 level data, yaitu Level 1C dan Level 2A. Perekaman data pada citra Sentinel-2A yang digunakan dalam penelitian ini menggunakan berbagai data musiman yang berbeda, termasuk musim peralihan dari musim kemarau ke musim hujan pada Oktober 2018, musim hujan pada November 2020, dan musim kemarau pada April 2022. NDWI digunakan untuk menganalisis area perairan dan non-perairan, sedangkan NDTI digunakan untuk menganalisis kekeruhan air. Hasil analisis menunjukkan bahwa nilai NDWI pada tahun 2018 dan 2020 berkisar dari nilai terendah -0,82 hingga nilai tertinggi 0,79. Hasil analisis pada tahun 2022 menunjukkan bahwa nilai NDWI berada dalam rentang nilai terendah -0,87 dan nilai tertinggi 0,99. Hasil analisis nilai NDTI pada tahun 2018 berkisar dari rentang nilai terendah -0,51 hingga nilai tertinggi 0,45. Hasil analisis nilai NDTI pada tahun 2020 berkisar dari nilai terendah -0,62 hingga nilai tertinggi 0,43. Hasil analisis NDTI pada tahun 2022 berkisar dari nilai terendah -0,72 hingga nilai tertinggi 0,43
Korelasi Kelimpahan Ikan Herbivora Dengan Tutupan Karang di Pantai Lipah, Karangasem, Bali Afip, Fahmi Anis; Dharma, I Gusti Bagus Sila; Atmaja, Putu Satya Pratama
ULIL ALBAB : Jurnal Ilmiah Multidisiplin Vol. 3 No. 4: Maret 2024
Publisher : CV. Ulil Albab Corp

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56799/jim.v3i4.3265

Abstract

Penelitian ini bertujuan untuk mengetahui nilai korelasi ikan herbivora dan tutupan terumbu karang di pantai Lipah, Desa Bunutan, Karangasem, Bali. Menggunakan metode Underwater Visual Census (UVC) untuk mengidentifikasi dan menghitung kelimpahan ikan herbivora dari empat keluarga ikan herbivora: Acanthuridae, Scaridae, Siganidae, dan Ephippidae. Selain itu, metode Underwater Photo Transect (UPT) digunakan untuk mengukur tutupan terumbu karang di lima titik pengamatan. Hasil penelitian menunjukkan keberadaan 12 spesies ikan herbivora dari 4 famili yang berbeda. Famili Acanthuridae memiliki rata-rata kelimpahan tertinggi, mencapai 79 ind/ha. Tutupan terumbu karang, meskipun bervariasi, secara umum tergolong dalam kriteria "cukup baik" hingga "kurang baik". Analisis data menunjukkan adanya korelasi yang kuat (rxy = 0.79) antara kelimpahan ikan herbivora. Hal ini mengindikasikan hubungan yang erat antara kelimpahan ikan herbivora dan terumbu karang. Ketika tutupan terumbu karang mengalami peningkatan, kelimpahan ikan herbivora juga cenderung meningkat. Sebaliknya, ketika tutupan terumbu karang mengalami penurunan, kelimpahan ikan herbivora cenderung mengalami penurunan serupa. Terdapat korelasi positif antara kelimpahan ikan herbivora dan tutupan terumbu karang, yang berarti ketika terumbu karang meningkat, kelimpahan ikan herbivora juga cenderung meningkat, dan sebaliknya.
Analysis of Potential Natural Disaster Risks in Buleleng Regency PUTRA, I Wayan Krisna Eka; DHARMA, I Gusti Bagus Sila; ASTARINI, Ida Ayu; KARANG, I Wayan Gede Astawa
International Journal of Environmental, Sustainability, and Social Science Vol. 4 No. 6 (2023): International Journal of Environmental, Sustainability, and Social Science (Nov
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/ijesss.v4i6.925

Abstract

Buleleng is one of the regency in the Province of Bali which has various potential disaster risks, mainly dominated by natural disaster. This condition is influenced by the topography of the Buleleng Regency area which has the characteristics of Nyegara Gunung, namely to the north is a coastal area while to the south is a hill’s area. Based on these conditions, it is necessary to have a risk analysis of natural disasters that have the potential to occur, so that alternative disaster management can be made. This study aims to determine the potential for disaster risk in Buleleng Regency and how the priorities for handling from the level of risk and intensity of the threat. The method used in this study is an analysis of potential natural disaster risks obtained from a combination of hazard, vulnerability and capacity data. Threat data was obtained from data released by BNPB from the inarisk.bnpb.go.id, while vulnerability and capacity data were obtained from interviews and secondary data from related agencies. The entire data obtained was then conducted an FGD with BPBD Buleleng Regency which was then analyzed descriptive qualitative. Based on the research results, it was found that the potential for disasters in Buleleng Regency were categorized into 2, namely: disasters that have a high risk impact are Earthquakes and Tsunamis, while disasters with high incident intensity are floods, extreme weather, extreme waves and abrasion, drought, landslides, flash floods and fires.
Co-Authors A.P.W.K. Dewi Abd. Rahman As-syakur Adi Prasetyo Afip, Fahmi Anis Andrianus Sembiring Astria Yusmalinda Atmaja, Putu Satya Pratama Boiris Benet Sinaga Budi Santoso Danie Al Malik Dewa Arya Dwiyana dody setiawan E. Faiqoh Elitza Germanov Elizabeth Anastasya Elok Faiqoh Endang Wulandari Suryaningtyas Gede Agus Bawantu Helga Margareta Hunter Hesti Aprianti I B. Suryadmaja I Dewa Anom Agung Dwi Putra Jayantika I Dewa Nym. Nurweda P., I Dewa Nyoman Nurweda Putra I G. Oka Wiradnyana I G. Suryadinata P I Gede Hendrawan I Gusti Agung Gede Bayu Gita Damara I Gusti Bagus Ngurah Adywan Surya Bhuwana I Gusti Ketut Sudipta I Gusti Ngurah Dirgayusa I Gusti Ngurah Putra Dirgayusa I Gusti Putu Ary Wedangga I Ketut Dedi Ariawan I Ketut Suputra I M.S. Darmasetiyawan I Made Mudiasa I Made Sukearsana I NYOMAN MERIT I Nyoman Norken I Putu Dede Charles Dharma Saputra I PUTU GUSTAVE SURYANTARA PARIARTHA I Putu Irpan Aditanaya I W BUDIARSA SUYASA I W Wedana Yasa I Wayan Gede Astawa Karang I Wayan Krisna Eka Putra I Wayan Nuarsa I Wayan Sandi Adnyana I Wayan Suarna I.W. Restu I.W.G.A. Karang I.Y.P. Perwira IDA AYU ASTARINI Ida Bagus Indra Danendra Irma Suryanti Janis Khansa Putri Argeswara Kadek Yudiastuti Karina Santoso M. Sudiana Mahendra Naila Makfiya Nanin Anggaraini Ngakan Putu Purnaditya Ni Kadek Dian Prinasti Ni Luh Gede Widya Bintang Gustavina Ni Luh Kade Paramita Kusuma Ni Luh Putu Ria Puspitha NI LUH WIDYASARI Ni Nyoman Pujianiki Niken Gustantia Pande N Sari Saraswati Paul Helga Fernandez Putra, I Nyoman Giri Putu Desy Darmasusantini Putu Dian Pertiwi Putu Eva Setiawati Putu Sri Juniarta Ratih Permitha Syury Sagung Putri Chandra Astiti Soni Senjaya Efendi Takahiro Osawa Widiastuti Karim Widiastuti Widiastuti Yolla Jessika Yulianto Suteja