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All Journal Jurnal Ilmiah Elektronik Infrastruktur Teknik Sipil Jurnal Ilmiah Teknik Sipil Journal of Marine and Aquatic Sciences Omni-Akuatika Journal of Marine Research and Technology TRITON : Jurnal Manajemen Sumberdaya Perairan Ulil Albab
I Gusti Ngurah Putra Dirgayusa
Program Studi Ilmu Kelautan, Fakultas Kelautan Dan Perikanan, Universitas Udayana, Kabupaten Badung, Bali - Indonesia
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Economics, Econometrics & Finance Education Environmental Science Social Sciences

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PREDIKSI PERUBAHAN GARIS PANTAI NUSA DUA DENGAN ONE-LINE MODEL Purnaditya, Ngakan Putu; Dharma, I Gusti Bagus Sila; Dirgayusa, I Gusti Ngurah Putra
Jurnal Ilmiah Elektronik Infrastruktur Teknik Sipil Vol 1 No 1 (2012): Vol.1, No.1, Desember 2012
Publisher : Jurnal Ilmiah Elektronik Infrastruktur Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (853.227 KB)

Abstract

Abstrak : Prediksi perubahan garis pantai Nusa Dua bertujuan untuk mengetahui perubahan bentuk profil garis pantai yang terjadi setelah dilakukan pemasangan groin dan pengisian pasir pada awal tahun 2004. Hasil monitoring menunjukkan bahwa pada seluruh segmen groin terjadi perubahan garis pantai dari tahun ke tahun. Berdasarkan hasil studi refraksi dan gelombang pecah, arus sepanjang pantai dominan terjadi dari arah selatan menuju arah utara.  Pemodelan perubahan garis pantai dilakukan dengan One-Line Model yang mensimulasi secara numerik pergerakan posisi garis pantai dengan berasumsi bahwa bentuk profil  garis pantai tidak berubah selama proses erosi dan akresi terjadi. Hasil simulasi hingga tahun 2030 menunjukkan perubahan garis pantai yang cenderung mengalami keseimbangan antara maju dan mundurnya garis pantai pada segmen groin G0-G1, G1-G4, G4-G5, G5-GN1, G9-G10, G10-UG1, UG1-GN2, dan GN2-G12. Pada segmen GA8-G0 diprediksi akan mengalami pemunduran garis pantai yang cukup besar pada ujung groin G0. Hasil simulasi juga menunjukkan bahwa pada bagian tengah-tengah segmen groin GA2-GA3, GA3-GA8 dan G12-Nusa Kecil tidak terjadi perubahan garis pantai yang signifikan.
Detection of Eutrophication In Benoa Bay - Bali Yulianto Suteja; I Gusti Ngurah Putra Dirgayusa
Journal Omni-Akuatika Vol 14, No 3 (2018): Omni-Akuatika November
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (585.051 KB) | DOI: 10.20884/1.oa.2018.14.3.490

Abstract

Eutrophication is an increase of organic material caused by the increase of nutrients in aquatic ecosystem by human activities. One effect of eutrophication is Harmful Algae Blooms (HABs) that are very harmful to the environment and humans. The Purpose of this study were determine spatial distribution of nutrient based on total nitrogen (total N) and total phosphate (total P), ratio of total N, and trophic level in Bay Benoa. Nutrient measurements were using spectrophotometric method. The Spatial distribution of total N and P show a generally pattern concentration increases in waters near the mainland. The highest concentrations of total N and P were found in Loloan River estuary closed to the floating net cages (FNC). Ratio of total N showed generally that the waters in Benoa Bay were dominated by Nitrate. High ammonia concentration was found in all rivers and Loloan River estuary. Benoa Bay is mostly in Oligotrophic conditions based on total N, while eutrophic conditions were only found in the Loloan River estuary. Based on total P, Benoa Bay was generally in hypertrophic level.
PENGELOLAAN WILAYAH PESISIR DI PANTAI PANDAWA Ni Nyoman Pujianiki; I Gusti Ngurah Putra Dirgayusa; I Made Rai Januatmika
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 24, No. 1, Januari 2020
Publisher : Department of Civil Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (197.465 KB) | DOI: 10.24843/JITS.2020.v24.i01.p02

Abstract

Pengelolaan wilayah pesisir dan pulau pulau kecil diatur dalam UU Nomor 27 Tahun 2007 yang selanjutnya diganti dengan UU Nomor 1 Tahun 2014 menyebutkan bahwa pengelolaan wilayah pesisir adalah suatu proses perencanaan, pemanfaatan, pengawasan dan pengendalian sumber daya pesisir dengan tujuan meningkatkan kesejahteraan masyarakat yang dilakukan oleh Pemerintah dan Pemerintah Daerah. Pantai Pandawa merupakan salah satu pusat wisata pantai di Bali yang mengalami kemajuan sangat pesat dalam waktu singkat dibandingan dengan wisata pantai lainnya yang sudah lama terkenal, terbukti dari kunjungan dan pendapatan setiap tahunnya. Peningkatan tersebut didukung oleh pengelolaan pesisir yang berbasis masyarakat. Tujuan penelitian ini adalah untuk mengkaji pengelolaan wilayah pesisir yang berbasis masyarakat yang diterapkan di Pantai Pandawa. Metode deskriptif kualitatif digunakan dalam penelitian ini dengan menggunakan 30 orang responden terdiri dari pengelola dan pelaku usaha di Pantai Pandawa yang dipilih dengan cara purposive sampling. Pengumpulan data dilakukan dengan cara observasi dan survei menggunakan kuesioner terbuka serta wawancara. Hasil pengumpulan data menunjukkan bahwa pengelolaan wilayah pesisir di Pantai Pandawa terdiri dari Perencanaan wilayah pesisir yang terprogram melalui perencanaan jangka panjang dan perencanaan jangka pendek. Pemanfataan wilayah pesisir sebagai daerah konservasi, pendidikan dan pelatihan, penelitian dan pengembangan, budi daya laut dan pariwisata. Sedangkan pengawasan dan pengendalian wilayah pesisir di Pantai Pandawa menggunakan sistem pengawasan dan pengendalian berbasis Desa Adat dengan memberdayakan masyarakat Desa Kutuh sebagai pengawas, serta kelembagaan Desa Adat sebagai koordinatornya.
Struktur Komunitas Uca Sp Di Kawasan Teluk Benoa Pada Karakteristik Substrat Yang Berbeda Ni Wayan Loviasari; Abd. Rahman As-syakur; Elok Faiqoh; I Gusti Ngurah Putra Dirgayusa; Dwi Budi Wiyanto
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (813.393 KB) | DOI: 10.24843/jmas.2018.v4.i01.141-150

Abstract

The mangrove ecosystem is home to a variety of fauna, ranging from water animals to primates, as a breeding ground for a variety of aquatic animals such as fish, crustaceans, crabs and mollusks, as well as a place to feed a number of wildlife such as reptiles and mammals. Uca sp is one of the fauna that utilizes and helps mangrove in its ecological balance. This research was conducted on 3 mangrove areas with the purpose of knowing the types and structure of Uca sp community on different substrate characteristics, where in Mertasari mangrove have the type of sandy substrate, Muara Waduk Nusa Dua Denpasar has kind of sandy loam substrate and Tanjung Benoa has kind sandy substrate. The sampling time was conducted in December 2016 when the lowest tide of the month. Determination of stations taken at each research location (station) using purposive sampling method. From the results of the study found Uca sp as many as 5 types, namely Uca cryptica, Uca dussumieri, Uca rosea, Uca cryptica and Uca crassipes. The highest density of Uca sp that is at station 2 located in Muara Waduk Nusa Dua Denpasar is 52,75 ind/m2 and lowest at station 3 in Tanjung Benoa get 32,25 ind /m2. The index values ??of the diversity of the three research stations are categorized into low diversity. In all three research stations categorized into uniformity index with depressed community or low uniformity. Based on the calculation on the three stations have a high dominance index.
Indeks Kesesuaian Wisata di Pantai Pasir Putih, Kabupaten Karangasem I Komang Subandi; I Gusti Ngurah Putra Dirgayusa; Abd. Rahman As-syakur
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (786.329 KB) | DOI: 10.24843/jmas.2018.v4.i01.47-57

Abstract

The study of tourist suitability index (IKW) was conducted in Pasir Putih Beach, Bugbug Village, Karangasem Sub-district, Karangasem district. Data was collected for 1 (one) month in January 2017 at 4 observation stations. Sources of primary data are obtained from observations and interviews with tourists and secondary data obtained from literature that related to agencies in Pasir Putih beach. Purposive sampling is used as a method for data collection. The data collected are incluted: coastal type, beach width, water depth, coastal slope, water base material, water flow velocity, waters brightness, coastal closure, harmful biota, and freshwater availability. The analysis of IKW for recreation beach category refers to the matrix of tourism and tourism conformity classification. The limiting factor of IKW in Pasir Putih Beach is coastal land cover and wide beach. IKW value for tourism activities in the beach recreation category at Pasir Putih Beach at station I of 94.23%, II of 96.79%, III by 85.89%, and VI of 81.41%. All stations are categorized as suitable (SS) for coastal tourism activities. Zone utilization coastal tourist area for swimming and sunbathing done at station I and II. Zone utilization area for recreation of a walk are station I, II, III, and IV. Station IV at south area including zone of sacred area.
Accumulation Of Heavy Metal Lead (Pb) And Cadmium (Cd) In Halophila ovalis And Thalassia hemprichii As Agents Of Phytoremediation In South Serangan I Ketut Budiarta; Elok Faiqoh; I Gusti Ngurah Putra Dirgayusa
Journal of Marine and Aquatic Sciences Vol 6 No 2 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i02.p2

Abstract

Seagrass ecosystem is part of the marine ecosystem that has quite important ecological role. Halophila ovalis and Thalassia hemprichii are seagrass species have the potential to become an agent of phytoremediation by determining the concentration of heavy metals Pb and Cd that have accumulated in them. This study was conducted in January 2018 in Southern Serangan Beach. The purpose of investigating the concentration of heavy metals in water, sediments, roots and leaves of seagrass and determine the bioaccumulation, translocation character and can be made as an agent for phytoremediation. The method used is purposive random sampling method, determined by 3 point. The point is determined from the condition closest to the port Benoa to the outermost point the bay mouth. Determination of station points is considering the presence of the most seagrasses. Results obtained in this study obtained average Pb concentration in water 0.0521 ppm, average metal Cd 0.1652 ppm, the average sediment Pb 75.8574 ppm, Cd 15.33593 ppm, concentration of Pb and Cd in roots and leaves of H. ovalis and T. hemprichii respectively Pb 42.4940 ppm, 45.5334 ppm, and 35.6207 ppm, 38.3931 ppm. Metal Cd 12.9708 ppm 14.8581 ppm Bioaccumulation value of seagrass is accumulator plants. Value of Pb and Cd translocation factors in seagrass H. ovalis (phyto-extraction) seagrass T. hemprichii Pb (phyto-extraction) and Cd (fitostabilization) phytoremediation values by both types of seagrass are greater in remediating heavy metal cadmium, meaning that both types of seagrass are better used for phytoremediation agents of heavy metal cadmium.
Perbandingan Produktivitas Pancing Ulur (HandLine) Dan Jaring Insang (Gill net) Nelayan Desa Kusamba, Klungkung, Bali Terhadap Hasil Tangkapan Ikan Tongkol (Auxis sp.) Pande Chrisna Aryasuta; I Gusti Ngurah Putra Dirgayusa; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 6 No 2 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i02.p12

Abstract

This study uses two environmentally friendly fishing gears namely gill net and hand line. The length of one set of hand line is 100 m and the length of one set of gill nets is 250 m. The purpose of this study was to determine the number of catches, species composition of catches and the efficiency of fishing gear that provided benefits for the fishermen of Kusamba Village. This data collection was carried out in field plunge directly with fishermen using the one day trip method for 35 trips during the tuna fishing season by Kusamba Village fishermen. Auxis sp is one type of fish that is the main target of the catch of fishermen in Kusamba Village. Auxis sp often follows the current circulation, the catch of Auxis sp on the fishermen of Kusamba Village has a different amount of production every day. In terms of Auxis sp catches by Kusamba Village Fishermen who use two fishing gear are dominated by gill nets and the quality aspect is dominated by hand linecatches. It is known that there are two types of tuna, namely Auxis rochei and Auxis thazard. The catch is in principle the output of fishing activities, while the effort needed in principle is an input from the fishing activities, fisheries production in an area has increased or decreased can be seen from the results of CPUE. The highest CPUE value of gill nets is 53.75 tails / effort, the highest CPUE value of hand line is 75 tails / effort.
Pengaruh Sebaran Konsentrasi Klorofil-a Berdasarkan Citra Satelit terhadap Hasil Tangkapan Ikan Tongkol (Euthynnus sp) Di Perairan Selat Bali I Made Satya Prayoga; I Dewa Nyoman Nurweda Putra; I Gusti Ngurah Putra Dirgayusa
Journal of Marine and Aquatic Sciences Vol 3 No 1 (2017)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1472.935 KB) | DOI: 10.24843/jmas.2017.v3.i01.30-46

Abstract

One of fisheries potential in Bali Strait is tuna fish (Euthynnus sp). Tuna fish (Euthynnus sp) resources is highly influenced by waters productivity which indicated by the chlorophyll-a concentration distribution. The aims of this study are: to find out the concentration spatial of chlorophyll-a distribution in Bali strait, to find out temporal variability of chlorophyll-a and tuna fish (Euthynnus sp) in Bali strait, and to find out the influence of chlorophyll-a concentration distribution to the catch of tuna fish (Euthynnus sp) in Bali strait. The analysis of the influence of chlorophyll-a concentration distribution to the catch of tuna fish (Euthynnus sp) in Bali strait uses regression polynomial order 2, correlation, and cross correlation. The influence of chlorophyll-a concentration distribution to the catch of tuna fish (Euthynnus sp) in Bali strait yearly time series climatology amounted to R2 = 0,1624 or 16,24%, the correlation coefficient values obtained by r = 0,1889. Seasonal time series climatology in west season (December - February) R2 = 0,0707 or 7,07%, the correlation coefficient values obtained by r = 0,0749. The transitional season 1 (March - May) R2 = 0,0095 or 0,95%, the correlation coefficient values obtained by r = - 0,0092. The east season (June - August) R2 = 0,086 or 8,6%, the correlation coefficient values obtained by r = - 0,2155. The transitional season 2 (September - November) R2 = 0,0482 or 4,82%. The correlation coefficient values obtained by r = - 0,1805
Laju Pertumbuhan Kerang Abalon Haliotis squamata Melalui Budidaya IMTA (Integrated Multi Trophic Aquaculture) di Pantai Geger, Nusa Dua, Kabupaten Badung, Provinsi Bali Heny Hayati; I Gusti Ngurah Putra Dirgayusa; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 4 No 2 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (925.597 KB) | DOI: 10.24843/jmas.2018.v4.i02.253-262

Abstract

Abalone is an important non fishery commodity that has high potential value to be developed. Abalone culture still faces some problems, such as, relatively slow growth rate, low survival rate and causing environmental pollution. One of the efforts to tackle the problems, is applying the culture system that is environmental friendly, such as IMTA (Integrated Multitrophic Aquaculture). This research aims to identify the growth rate and survival rate of the abalone (Haliotis squamata) and the suitability of chemical and physical environment parameter supporting the integration culture of abalone and seaweed (Gracilaria sp) on different stocking density at Geger beach, Nusa Dua, Bali. This research was performed in 45 days using a complete randomized design method that consist of three treatments and three repetition. The result showed that the highet growth rate was on treat ment T3 which consisted of abalone (Haliotis squamata) 40 individu and 10 bunches of seaweed (Gracilaria sp) 100 grams weight/each individu (0.76%/day), then It followed by T2 treatment that was integrated with 10 bunches of seaweed 50 grams (0.71%/day). The lowest growth rate observed on treatment T1 (control/monoculture) which consisted of 40 individu abalone (Haliotis squamata) (0.59%/day). The highest survival rate found on treatment T2 (97.5%) and followed by treatment T1 as control (94.5%), while the lowest number was found on treatment T3 (83.3%). Physical chemical water quality parameters showed that It supported the growth of both, abalone (Haliotis squamata) and seaweed (Gracilaria sp.) at Geger Beach, Nusa Dua, Badung Regency, Bali Province.
Studi Kelimpahan Dan Keanekaragaman Kepiting Di Hutan Mangrove Dan Padang Lamun Di Pantai Mertasari I Gusti Ayu Dian Indraswari; I Gusti Ngurah Putra Dirgayusa; Elok Faiqoh
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (695.739 KB) | DOI: 10.24843/jmas.2018.v4.i01.162-170

Abstract

The ecosystem of mangroves and seagrass in Mertasari Beach are located nearby and and inhabited with various species that coexist, One of the association’s creature in mangrove ecosystem and seagrass ecosystem is crab. There were a habitat selection of crabs, so it does possible to find the same species in the mangrove ecosystem and seagrass ecosystem. This research aims to know the type, abundance and diversity of crabs in the Mertasari Beach on two different ecosystems such as mangrove and seagrass ecosystem. The research were conducted in January until February 2017. In this research the Random sampling method was used to create a 1x1m2 square placed on 5 substations at each research station. Crab sampling was conducted at the lowest tide and has been done twice in a month. The results showed there were 7 families with 20 species. In both ecosystem were found 3 spesies such as Scylla serrata, Grapsus albolineatus and Myomenippe fornasinii. This happens because of several factors, like the tidal and the flow of the river into habitat removal by crabs. The highest abundance of crabs was found in mangrove stations of 411 individuals/m2, while at the seagrass station were 93 individuals/m2 due to food availability and environmental conditions. The highest value diversity index (H) at mangrove station was 1.94 and seagrass station of 1.73 with moderate category indicated in those area had sufficient productivity, conditions of the ecosystem is pretty balanced and moderate ecological pressure.
Co-Authors AAK Aswan Deva Abd. Rahman As-syakur Andreas Pratama Togatorop Basyaasyah Rahmaningrum Pettalolo Br Sitepu, Fany Ekaristy Carolina Asrin Desy Shintya Irene Dwi Budi Wiyanto Elok Faiqoh Febriyanto Arifin Gede Surya Indrawan Heny Hayati Heru Wicaksono I Dewa Nym. Nurweda P., I Dewa Nyoman Nurweda I Gede Hendrawan I Gede Surya Indrawan I Gusti Ayu Dian Indraswari I Gusti Ayu Ricca Mahatma Putri I Gusti Bagus Sila Dharma I Gusti Bagus Sila Dharma I Kadek Aldi Wahyu Andika Maha Putra I Ketut Budiarta I Ketut Wija Negara I Komang Subandi I Made Raditya Putra I Made Rai Januatmika I Made Satya Prayoga I Made Subali Arta Arta I Pande Made Lanang Kertadana I Putu Aditya Budi Wacika I Putu Oka Saduarsa I Wayan Artadana I Wayan Nuarsa Ida Ayu Made Inten Melinia Ida Bagus Ketut Ravidhya Krisna Sekar Ida Bagus Putu Adi Gita Saputra Ika Arofa Setiawati Jenisia Barros Soares Jesikapna Callia Br Guru Singa Kadek Weda Ari Bhawana Kadek Widya Suryaningsih Muhammad Fakhri Ramadhani Ngakan Putu Purnaditya Ni Kadek Apriantari Ni Luh Putu Ria Puspitha Ni Luh Putu Ria Puspitha Ni Nyoman Desi Kusuma Dewi Ni Nyoman Pujianiki Ni Wayan Loviasari Nur Asni Puspita Sari Pande Chrisna Aryasuta Puspitha, Ni Luh Putu Ria Putra, I Nyoman Giri Putu Adi Prawira Riris Christiani Gultom Rizky Ramadhan Siahaan, Jonathan M Timothy Kenoly Trisilia Mulyawati Anggraeni Wattimena, Adolf Krisna Mahendra Widiastuti Karim Widiastuti Widiastuti Yulianto Suteja