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All Journal Jurnal Ilmiah Elektronik Infrastruktur Teknik Sipil Journal of Marine and Aquatic Sciences Buletin Udayana Mengabdi Jurnal Spektran Ecotrophic, Journal of Environmental Science ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Teknik Sipil Journal of Marine Research and Technology

I Gusti Bagus Sila Dharma

Fakultas Kelautan Dan Perikanan Universitas Udayana

Author-ID : 253205

Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Environmental Science

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Design Formulae of Wave Transmission due to Oblique Waves at Low Crested Structures Siladharma, I Gusti Bagus
Jurnal Teknik Sipil Vol 18, No 1 (2011)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (279.355 KB)

Abstract. Low crested structures, including submerged breakwaters, may be provided to protect the beach from wave attack. These structures can be built parallel to the shoreline and the crest is set up at or below water levels. It function is to protect the beach from wave action by reducing or by acting as a barrier to the waves. Wave transmission on structures has been subject for flume tests by many researchers and come up with several 2D wave transmission formulas. Oblique wave attack rarely involve on the formula since only a few tests conducted on 3D model. Using 3D test data conducted by Seabrook (1997), wave-structure interaction relation in 3D effect was modeled and transmission formula for low crested structures was developed. The interaction of wave-structure in the 3D modeling is more complex. The complex, three dimensional wave-structure interactions include diffraction of the wave. Results show the relative crest height, relative wave height and crestÂ width are the most important parameters. The model was developed by statistical analysis method, includes parameters that are considered to be representing physical processes such as water depth fluctuation, hence is related to wave breaking, wave overtopping, dissipation by surface friction, and transmission through the breakwater. Abstrak. Pemecah gelombang ambang rendah, termasuk pemecah gelombang tenggelam, dapat dipergunakan sebagai pelindung pantai dari serangan gelombang. Stuktur dengan ambang lebar ini dibangun sejajar pantai dengan puncak berada pada muka air atau sedikit di bawahnya. Fungsi utama dari bangunan ini adalah melindungi pantai dari gelombang dengan cara mereduksi energi gelombang datang atau sebagai penghalang gelombang. Bangunan ini berfungsi dengan baik dengan meredam sebagian energi gelombang. Transmisi gelombang pada pemecah gelombang ambang rendah tumpukan batu sudah banyak diteliti dan menghasilkan beberapa formula yang dihasilkan dari tes 2 dimensi. Gelombang yang datang menyudut terhadap struktur tidak diperhitungkan karena sangat terbatasnya penelitian transmisi gelombang dalam kondisi 3D. Menggunakan data 3D dari Seabrook (1997), analisis dilakukan untuk interaksi gelombang-struktur dan formula empiris transmisi gelombang diturunkan. Interaksi gelombang-struktur dalam model 3D lebih komleks dari model 2D. Kekompleksan dalam model 3D termasuk adanya proses difraksi pada ujung-ujung pemecah gelombang, Hasil penelitian menunjukkan bahwa tinggi puncak relatif, tinggi gelombang relatif, dan lebar puncak merupakan parameter yang sangat berpengaruh terhadap proses transmisi Rumus empiris diturunkan berdasarkan analisis statistik. Rumus transmisi gelombang memasukkan parameter-parameter yang merepresentasikan proses-proses fisik seperti fluktuasi muka air, yang berkorelasi dengan gelombang pecah, overtopping gelombang, disipasi akibat gesekan permukaan, dan transmisi gelombang melalui bangunan.

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)

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.

Analisis Perubahan Garis Pantai dengan Menggunakan Metode One-Line Model (Studi Kasus: Pantai Kecamatan Kuta, Bali) Naila Makfiya; IGB Siladharma; I Wayan Gede Astawa Karang
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.p6

Construction along the coastline has impacts and threats to coastal areas. Incompatibility and deficiency in building construction along the coast can be detected by observing shoreline changes that happen before and after construction. Along with technology advances and science, coastline change can be detected by using numerical modeling. Beach in Kuta District in the Bali Province is a tourist destination that has a coastal erosion problem. Analysis of shoreline changes at the study location is estimated by using numerical simulations (one-line model) to find out the coastline changes that happen on Kuta District for 25 years after the construction of beach protector and sand nourishment. The results of numerical modeling shoreline changes in all study locations over 25 years show an erosion and accretion with the amount of erosion change rates ranging from 1 to 2 meters per year. The analysis coastline change in Kuta District shows that the changes are classified as moderate to large, on the beaches in the north of Kuta Village such as on the beach of Legian Village and beach of Seminyak Village which did not have protection or beach protector such as the German Beach and the Kuta Beach with breakwater, groyne, revetments or handling erosion with sand nourishment.

Fluktuasi Total Padatan Tersuspensi (Total Suspended Solid) dan Kekeruhan di Selat Lombok Boiris Benet Sinaga; Yulianto Suteja; I Gusti Bagus Sila Dharma
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.p11

Total suspended solid is particles or living components (biotics) such as phytoplankton, zooplankton, bacteria, fungi, or dead components (abiotics) such as detritus and solids (sand, mud, and clay) suspended in water.. Total suspended solids are related to turbidity. Therefore, turbidity and total suspended matter can be used as water quality parameters that can determine whether the water conditions are good or not. The Lombok Strait is semi-closed waters that are influenced by local influences such as input from the river. This will certainly affect the total suspended solids found in the Lombok Strait waters. This research was conducted in November 2017. Field sampling was carried out in the Lombok Strait waters at the point of 116 ° 1'18 "BT, 8 ° 34'12" LS. The sampling time is carried out for 1 x 24 hours, starting on November 3 until the November 4, 2017. From the results obtained, TSS on the Lombok Strait Waters has fluctuated. The highest TSS concentration was found at a depth of 0 when the tide conditions were heading to recede. The lowest TSS concentration is obtained when low tide heading to high tide. Turbidity concentration values ??at 5 - 10-meter depths ranged from 0-0.2 NTU. Turbidity and total suspended solids are different in each depth. The vertical pattern of turbidity distribution in this study shows significant results between the surface and bottom of the water. The value of turbidity decreases with increasing depth and time.

Laju Pertumbuhan Rumput Laut Gracilaria sp Melalui Budidaya IMTA (Integrated Multi Trophic Aquaculture) di Pantai Geger, Nusa Dua, Kabupaten Badung, Bali Kadek Yudiastuti; I Gusti Bagus Sila Dharma; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 4 No 2 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Gracilaria sp is red alga which belong to class rhodophyceae. It can grow in shallow salt water with a general characteristic is having a cylindrical and branched thallus form. Seaweed cultivation can be performed through IMTA (Integrated Multi Trophic Aquaculture) method. The basic principle of cultivation through the IMTA method is utilizing service of the low thropic level species in marine ecosystems, such as shells and seaweed. This method is believed to be able to overcome the environmental problems caused by cultivation activities, such as feces and uneaten feed. This research was perfomed 45 days, from February 25 to April 11, 2017. It was held at Geger Beach, Nusa Dua, Badung Regency, Bali, using a complete randomized design method that consist of three treatments and three repetition for each treatment. Treatment control (T1) consisted of 10 bunches of seaweed 100 grams without the abalone, treatement 2 (T2) consisted of 10 bunches of seaweed 100 grams and 20 abalones and treatement 3 (T3) consisted of 10 bunches of seaweed 100 grams and 40 abalones. The result showed that specific growth rate in Gracilaria sp. was highest in treatment T1, compared to treatment T2 and T3. This was caused by the cage construction of abalone amd the present of small mesh size net to cover the seaweed planting, which made the growth was not optimal. However, the use of a nets system in seaweed cultivation could minimize the loss of thallus. It was proved by the survival rate of seaweed in first, second and third, that is averagely high, ranging from 90% to 100%. Physical and chemical water quality parameters are also measured, and It showed that the water quality was suitable for the cultivation of both, seaweed and abalone.

Pertumbuhan dan Produktivitas Daun Lamun Thalassia hemprichii (Ehrenb) Ascherson di Perairan Tanjung Benoa, Bali Budi Santoso; I Gusti Bagus Sila Dharma; Elok Faiqoh
Journal of Marine and Aquatic Sciences Vol 4 No 2 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Thalassia hemprichii is one of the seagrass as favorite food of two protected herbivores such as Green Turtle and Dugong. The existence of Thalassia hemprichii and knowing the growth rate becomes very important for sustainability of two herbivores. The study was conducted in Tanjung Benoa waters that covering three parts of the coast such as Samuh, Conrad and Tanjung beach in February until March 2017. Thalassia hemprichii leaves growth is observed consist of long and heavy growth (dry weight) and measured leaf age that has been observed such as young, half old and old leaves. The method that used to measure the growth of Thalassia hemprichii is pruning method and determination the research location using purposive sampling method. The aim of this research is explained the growth rate, biomass, and productivity of young leaves, old leaves of Thalassia hemprichii in Tanjung Benoa Bali. Measurement results of Thalassia hemprichii growth between age group of leaves has different young leaves faster growth if compared with the half old leaves and old leaves with average growth is 3.41mm/day indicates that the efficiency of this seagrass growth will decrease as the leaves age. The highest biomass values ??were found in older leaves if compared with young leaves and half-old leaves with average 0.205 gbk/m2 expected because the thick and wide leaf size will produced larger leaf biomass. The highest productivity value is found in oldest leaves in each station with average 0.028 gbk/m2/day expected morphology and different nutrient content in each leaf tissue.

Pengaruh Suhu Permukaan Laut terhadap Hasil Tangkapan Ikan Cakalang (Katsuwonus pelamis) di Perairan Selat Bali I Gusti Agung Gede Bayu Gita Damara; I Gusti Bagus Sila Dharma; Yulianto Suteja
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.p3

This study aims to examine the effect of sea surface temperature on the skipjack tuna catch (Katsuwonus pelamis) in the waters of the Bali Strait. The waters of the Bali strait are selected by the authors because the waters of the Bali strait have the potential of catching tuna fish is high. The research is measured by using regression polynomial method of order 2. With the results of this study found from the sea surface temperature data in the results of the average - the average year 2011 - 2015 where the highest value is in March at 30.240C and the lowest in September of 25.870C. For skipjack catch data in 2011 - 2015 where the lowest weight in June was 4. 590 kg, while the highest weight in July was 61,367 kg, and beside that the result of regression 2nd polynomial regression was obtained with R = - 0.60 which has a strong meaning is inversely proportional or in other words sea surface temperature does not affect the catching of skipjack tuna in the waters of bali strait because in addition to sea surface temperature factors other indicators such as chlorophyll, depth, and oceanographic factors also affect the catch skipjack tuna in the waters of the bali strait.

Karakteristik Mikroplastik pada Daerah Feeding Ground Pari Manta, Big Manta Bay, Nusa Penida Janis Khansa Putri Argeswara; I Gede Hendrawan; IGB Sila Dharma; Elitza Germanov
Journal of Marine and Aquatic Sciences Vol 7 No 1 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i01.p14

Microplastic, the pieces of plastic sized < 5 mm, are dangerous materials for marine organisms where if is ingested can anatomically and physiogically change the marine organism. Manta rays (Mobula alfredi) are filter feeders where they eat planktons and small fishes by filtering seawater. Mantas can filter up to hundreds cubic meter everyday, indicating the chances of it ingesting microplastics. This research was conducted to find out the microplastic characteristics at Big Manta Bay, Nusa Penida. Samples were obtained at two sites, North and South Big Manta Bay, by trawling 6 times on each site that represents Big Manta Bay using a plankton net. Samples were processed by separating plastics and organic matters using density separation method, and afterwards identified based on its type, quantity and size using a dissecting microscope. Results from the research came back stating the microplastic abundance reached 123,767 pieces/km2, with a total number of microplastics up to 174 pcs. The types of plastics most frequently found are fragments (44,69%), films (38,55%), fiber (14,53%) and foam (2,23%). Samples were also analysed using FTI-R Spectrometry, where plastics are identified as Polypropylene (PP) and Low-density Polyethylene (LDPE). Both polymers are the top two polymers that are produced globally.

Struktur Komunitas Vegetasi Mangrove Berdasarkan Karakteristik Substrat di Taman Hutan Raya Ngurah Rai, Bali Ni Kadek Dian Prinasti; I Gusti Bagus Sila Dharma; Yulianto Suteja
Journal of Marine and Aquatic Sciences Vol 6 No 1 (2020)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2020.v06.i01.p11

Mangrove is a typical type of vegetation found in tropical beach areas. Mangrove forests as one of the potential natural resource that is utilized by the community. Excessive utilization of mangrove forest and not offset by rehabilitation will lead to a decrease in mangrove area which causes reduced mangrove function in the ecosystem. One of the factors affecting mangrove growth is soil or substrate. In general, mangrove forest areas are present throughout the Indonesian coast and are grown in locations that are still influenced by tidal activity. The largest mangrove forest destruction in Bali occurred in the area of Tahura Ngurah Rai, which is 253.4 hectares of total area of 1,373.5 hectares. The purpose of this research is to know the structure of the mangrove community based on the characteristics of the substrate at Taman Hutan Raya Ngurah Rai, Bali. Data collection using line transect method and analyzed quantitatively by using INP analysis. From five research stations, nine mangrove species are found, including Sonneratia alba, Rhizophora mucronata, Rhizophora apiculata, Bruguiera gymnorhiza, Bruguiera sexangula, Xylocarpus granatum, Avicennia lanata, Avicennia officinalis and Aegiceras floridium. The substrate component in TAHURA is dominated by sand followed by clay and mud. Species Sonneratia alba and Rhizophora apiculata are found in all types of substrates, Rhizophora mucronata species found in two substrate types, sandy loam substrates and sandy clay, but some species are found only in one type of substrate such as Xylocarpus granatum, Avicennia lanata, Avicennia officinalis, Bruguiera gymnorhiza and Bruguiera sexangular.

Studi Hindcasting Dalam Menentukan Karakteristik Gelombang dan Klasifikasi Zona Surf Di Pantai Uluwatu, Bali Karina Santoso; I Dewa Nyoman Nurweda Putra; I Gusti Bagus Sila Dharma
Journal of Marine and Aquatic Sciences Vol 5 No 1 (2019)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Bali is one of the islands where there are many surf zones with various characteristics. In addition, Bali is also a heaven with a classy wave for the surfers of the world. One of the most challenging places to surf in Bali is Uluwatu Beach. Uluwatu Beach is ranked the 3rd best surf spot in the world version of CNN Travel in 2012. Wind causes sea waves, therefore wind data can be used to estimate the height and direction of the waves. Wave Hindcasting with Sverdrup, Munk and Bretschneider (SMB) method is calculated based on wind data for 10 years (2001 - 2010) from BMKG Ngurah Rai Station - Denpasar to obtain a significant wave height and period. In this research, it is necessary to approach through Hindcasting procedure, wave transformation analysis and surfing Terminology in determining the type of breaking wave and classification of surf zone in Uluwatu Beach area. Wave calculation result in Uluwatu Beach dominated by wave that coming from west side with significant wave height (Hs) of 0.98 m and significant wave period (Ts) of 5.21 s. The wave height due to the influence of wave refraction and shoaling is 0.976 m. The breaking wave height obtained from the calculation is 1.04 m at a depth of 0.849 m. From the result in this research, it can be concluded that the breaking wave type that occurred at Uluwatu Beach is plunging type according to the calculation result from its Irribaren number (0.4 <Ni <2.3). The classification of the surf zone at Uluwatu Beach based on its breakup type of wave is thought to be a good zone for surfers on intermediate level.

Co-Authors A.P.W.K. Dewi Adi Prasetyo Andrianus Sembiring Astria Yusmalinda 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 Irpan Aditanaya I W BUDIARSA SUYASA I W Wedana Yasa I Wayan Gede Astawa Karang I Wayan Nuarsa I Wayan Sandi Adnyana I Wayan Suarna I.W. Restu I.W.G.A. Karang I.Y.P. Perwira 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 Nyoman Pujianiki Niken Gustantia Pande N Sari Saraswati Paul Helga Fernandez Putra, I Nyoman Giri Putu Desy Darmasusantini Putu Dian Pertiwi Putu Sri Juniarta Ratih Permitha Syury Soni Senjaya Efendi Takahiro Osawa Widiastuti Karim Widiastuti Widiastuti Widya Sari Yolla Jessika Yulianto Suteja

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