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All Journal Journal of Marine and Aquatic Sciences 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 BULETIN FISIKA Journal of Marine Research and Technology International Journal of Remote Sensing and Earth Sciences (IJReSES)

I Gede Hendrawan

Program Studi Ilmu Kelautan, Fakultas Kelautan Dan Perikanan, Universitas Udayana

Author-ID : 3755542

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Physics Veterinary

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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

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

Struktur Komunitas Ekosistem Pesisir (Lamun dan Mangrove) di Desa Sulamu Nusa Tenggara Timur Ariandini, Yovita; Faiqoh, Elok; Hendrawan, I Gede
Rekayasa Vol 14, No 2: Agustus 2021
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v14i2.10969

East Nusa Tenggara Province (NTT) is an archipelago province located in the south of Indonesia has a sea area of 200,000 km2 (outside ZEEI) in it has marine resources and fisheries that can be developed for the benefit of the community. Seagrass and mangrove ecosystems play an important role for the environment both physically and ecologically. To know the condition of the ecosystem, it is necessary to conduct research on the community structure of seagrass and mangrove ecosystems. This research was conducted in Sulamu Village, Kupang waters in November 2018. Each ecosystem is sampling as many as 3 stations with 3 stations each. From the results obtained, found 7 species of seagrass in salamu village waters namely Halodule pinifolia, Thalassia hemprichii, Cymodocea serrulate, Enhalus acoroides, Halophila ovalis, Cymodocea rotundata, and Halodule uninervis. Seagrass density obtained is the highest 2847 tgk/m2 and the lowest 1392 tgk/m2 with stable community conditions. In mangrove ecosystems found 11 types of mangroves found in sulamu waters namely Avicennia alba, Osbornia octodonta, Bruguiera parviflora, Aegiceras corniculatum, Rhizopora mucronata, Sonneratia alba, Rhizopora apiculata, Xylocarpus granatum, Limnitzera racemosa, Gymnanthera paludosa and Nypa frutican. The mangrove community structure in the waters of Salamu Village is unstable and dominating.

STUDI TRANSPOR SEDIMEN DI TELUK BENOA MENGGUNAKAN PEMODELAN NUMERIK Herlambang Aulia Rachman; I Gede Hendrawan; I Dewa Nyoman Nurweda Putra
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1617

Teluk Benoa merupakan daerah estuari semi tertutup yang terdapat di wilayah selatan Bali. Kawasan ini merupakan daerah yang menjadi muara bagi beberapa sungai besar yang terdapat di Bali. Sungai merupakan salah satu sumber aliran material seperti angkutan sedimen yang dialirkan menuju ke laut. Proses transpor sedimen di Teluk Benoa dapat didekati dengan pemodelan numerik FVCOM (Finite Volume Coastal Ocean Model) untuk mengetahui distribusi sedimen yang terdapat di daerah teluk. Hasil model numerik menunjukkan bahwa proses pergerakan sedimen akan mengikuti bentuk pola arusnya. Pola pergerakan arus di Teluk Benoa akan mengikuti pola pasang surutnya dimana saat akan pasang pola arus akan mengarah ke dalam teluk dan sebaliknya pada saat surut. Kecepatan arus rata-rata pada bagian mulut mencapai 0.8 m/s pada saat menuju pasang dan 0.9 m/s pada saat menuju surut. Besar kecepatan arus akan mengalami perlambatan pada saat kondisi pasang tertinggi dan surut terendah yakni hanya mencapai rata-rata sekitar 0.3 m/s. Konsentrasi sedimen tertinggi pada saat pasang atau surut terjadi pada bagian dekat muara sungai yang mencapai 100 mg/L dan mulut teluk yang mencapai 150 mg/L. Tingginya konsentrasi sedimen di mulut teluk diakibatkan adanya erosi pada bagian dasar perairan akibat kecepatan arus yang cukup tinggi. Hasil validasi elevasi pasang surut pada model didapatkan root mean square error (RMSE) sebesar 9.18 cm dengan koefisien determinasi (R2) mencapai 0.97. Untuk perbandingan hasil model sedimen dengan data observasi berupa Total Suspended Solid memiliki tingkat korelasi sebesar 0.77. STUDY OF SEDIMENT TRANSPORT AT BENOA BAY USING NUMERICAL MODELLINGBenoa Bay is a semi-enclosed estuary area located in the south of Bali. This area is became estuary for several rivers in Bali. The river is a source of material such as sediment transport stream that flowed into the sea. Sediment transport processes in Benoa Bay can be approximated by numerical modeling FVCOM (Finite Volume Coastal Ocean Model) to determine the distribution of sediments found in the bay area. Research carried out by the whole domain Benoa Bay area in January 2016. The results of numerical models show that the process of sediment movement will follow the current pattern shape. The pattern of the movement of currents in the Benoa Bay will follow the pattern of tide where the current will flow lead into the bay at high tide and vice versa. Average flow velocity at the mouth reaches 0.8 m/s at the time to the tide and 0.9 m / s at the time towards low tide. Current speed will slow down when the condition of the highest and lowest tide that is only reached an average of about 0.3 m/s. The highest sediment concentrations at high tide or low tide occurs in the section near the mouth of the river that reached 100 mg/L and the mouth of the bay, which reached 150 mg/L. The high concentration of sediment at the mouth of the bay due to the erosion of the bottom waters due to the flow velocity is high. The results of the validation by tidal elevation models obtained root mean square error (RMSE) of 9:18 cm with a coefficient of determination (R2) reached 0.97. For the comparison of model results with observational data in the form of sediment Total Suspended Solid has a level of correlation of 0.77.Keywords: Benoa Bay, Sediment, Numerical modelling

Distribusi Nitrat dan Fosfat Secara Spasial dan Temporal Saat Musim Barat Di Permukaan Perairan Teluk Benoa, Bali Ni Wayan Sukma Taraning Rahayu; I Gede Hendrawan; Yulianto Suteja
Journal of Marine and Aquatic Sciences Vol 4 No 1 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Benoa Bay is an estuary that effected by pollutan from river and human activity. Reasearch on spatial and temporal distribution of nitrate and phosphate has been conducted in Benoa Bay. Data was collected at water surface during ebb from December 2016 to Februari 2017. There were19 Sampling pointlocated in Benoa Bay and 6 pointslocated in rivers around Benoa Bay. Nitrate was analysed using Brucine method and phosphate was analysed using Amm-Molybdat method. The concentration of nitrate from December 2016 to February 2017 ranged from 0,036 mg/L to 1,154 mg/L and the concentration of phosphate ranged from undetectedto 0,739 mg/L. The concentration of nitrate at rivers ranged from undetectedto 3,584 mg/L andthe concentration of phosphate ranged from undetectedto2,405 mg/L. The concentration of nitrate and phosphate from December 2016 to February 2017 was fluctuating and the highest average concentration of nitrat and phosphate was found in February 2017. These was due to high rainfall in February 2017 and cause a lot of organic matters carried by the rivers into Benoa Bay. The highest distribution concentration of nitrate and phosphate was found around estuary. These due to input of organic matters from mainland through the rivers. Based on water quality standards of Bali Goverment, the concentration of nitrate and phosphate was exceeds the seawater quality standart.

Identifikasi Hiu yang Diperdagangkan di Bali Menggunakan Metode DNA Barcoding dan Analisis Filogenetik Rizaldi Cahya Bramasta; Elok Faiqoh; I Gede Hendrawan; Andrianus Sembiring; Ni Luh Astria Yusmalinda
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.p12

Sharks are one of the keys for ecosystems balance in the ocean. Sharks as top predators have an important role to maintain the stability of the food chain in the ocean. The loss of sharks will have a major impact on the marine ecosystem, so the presence of sharks in the ocean must be protected from extinction. However, there are some activities such as sharks hunting and trading going on because of the high demand of sharks processed products. Bali is one of the locations of shark fishing and trading activities. The problem is the trade-in sharks have gone through the finning process, leaving only the body parts or fins which resulted in the difficulty of morphological identification process. An alternative method that can be used if molecular identification cannot be done is DNA Barcoding. DNA Barcoding means identifying all the animal species with an effective molecular approach applied to identify species. The identification results of DNA Barcoding of shark’s trade in Bali shows that there are four species of sharks have been sold, which is hammerhead sharks (Sphyrna lewini), thresher sharks (Alopias pelagicus), big eye thresher shark (Alopias superliciosus), silky sharks (Carcharinus falciformis). These sharks registered in the IUCN red list, Sphyrna lewini classified as threatened species, while the others (Alopias pelagicus, Alopias superciliosus and Carcharinus falciformis) classified as vulnerable species. In the international trade regulations on CITES, these four species come under the Appendix II. In national regulations, Alopias pelagicus, Alopias superciliosus, Sphyrna lewini have been regulated by the Ministerial regulations, while for Carcharinus falciformis, there are no national regulations yet.

Pemodelan Oksigen Terlarut (Dissolved Oxygen/DO) di Perairan Teluk Benoa Dika Madyawan; I Gede Hendrawan; 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.p15

Dissolved oxygen by definition is the total milligrams of oxygen gas dissolved in water which is influenced by atmospheric pressure, temperature, salinity, water turbulence, photosynthesis, respiration and waste. The Finite Volume Coastal Ocean Model (FVCOM) method is one of the ways to study water quality model. This study is aimed to determine the spatial distribution of DO concentration in Benoa Bay during the rainy season on the water surface and the deeper waters. This study was conducted in the waters of the Benoa Bay and rivers which empties into Benoa Bay on January 29 to February 25 2018, representing the rainy season. In carrying out the simulation, two steps are carried out, firstly numerical modeling was done to get ocean current patterns in Benoa Bay, and secondly making a numerical model where DO concentration values are added to get the results of DO distribution horizontally and vertically. The value of DO results ranged from 4.3 to 8.4 mg/l on the surface water of Benoa Bay. Based on tidal results of model during its highest tide, high tide to low tide, and lowest tide conditions, DO concentrations on the surface are higher than the deeper water. However, during low tide to high tide conditions, DO concentrations on the surface water is higher than the deeper water. Conclusions obtained from this research shows that DO concentrations in Benoa Bay waters have a minimum value of 2 mg/l and a maximum of 8.4 mg/l., where conditions of the tidal elevation affects DO concentrations, where it tends to go higher near the land and on sea surface.

Prediksi Laju Sedimentasi di Perairan Teluk Benoa Menggunakan Pemodelan Numerik I Putu Ranu Fajar Maharta; I Gede Hendrawan; Yulianto Suteja
Journal of Marine and Aquatic Sciences Vol 5 No 1 (2019)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Benoa Bay is one of the unique ecosystems on the island of Bali because it is a shallow estuary area and has an ecosystem that is important for the waters of the mangrove ecosystem and seagrass. In recent years, Benoa Bay has been reported to have undergone siltation due to sedimentation. However, there has not been much scientific study of the sedimentation rate occurring in Benoa Bay. The study of sedimentation will provide an overview of the rate of sedimetation in the study area. Numerical modeling is one of the most commonly used methods to describe hydrodynamic processes in waters, which are the main drivers of the process of movement of pollutants in waters such as waste, sediment, and others. Thus, the study of sedimentation rate, either spatially or temporally, needs to be done in the waters of Benoa Bay using numerical modeling. The results of this study show that sedimentation rates in Benoa Bay have a minimum value of 1.08x10-6 and a maximum of 24.88 kg/m2/day with an average of 0.57 kg/m2/day. High sedimentation rates occur in the western part of the bay, on the river route, and in the northern part of the bay, between Serangan Island and Mertasari beach. Areas that potentially experience silting in Benoa Bay include the southern port of Benoa Harbor which reaches 0.23 m/year, the waters north of Serangan Island reaching 0.008 m/year, and the area close to the estuary which reaches 0.35 m/year.

Model Hidrodinamika Pasang Surut di Perairan Pesisir Barat Kabupaten Badung, Bali Made Narayana Adibhusana; I Gede Hendrawan; I Wayan Gede Astawa Karang
Journal of Marine and Aquatic Sciences Vol 2 No 2 (2016)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Finite Volume Coastal Ocean Model (FVCOM) is using for numerical modeling of hydrodynamic tidal water in west coast of Badung regency, Bali. The model result is validation with field observations data in the area using the equation Root Mean Square Error (RMSE). Field tidal data elevation of sea level elevation measurements were obtained by using the palm of tidal. Field data speed and direction of sea currents obtained using Lagrangian method. Excellent results obtained with RMSE values tidal elevation of sea level by 0.24 m dan RMSE values for sea current is 0.125 m/s. The results of model simulations show sea current patterns in the waters of the west coast of Badung regency, Bali relatively the same at the spring tide and neap tide conditions. The pattern of sea currents at high tide shows current vector that moves in toward the water of the west coast of Badung regency area from Bali Strait and the Indian Ocean. At the time of low tide sea current vector movement towards Bali Strait and the India Ocean. Sea current velocity in the eastern waters of the west coast of Badung regency (longitude of 115,05°– 115,17°) is higher than the sea current velocity in western waters area (longitude of 114,95°– 115,05°). Sea current velocity in the waters of the west coast of Badung regency on the condition of the spring tide range from 0.005 to 0.025 m/s, on the other side the sea current velocity on the neap tide conditions range from 0.005 to 0.012 m/s.

Persepsi Nelayan Terhadap Status Konservasi Hiu dan Pengaruhnya Terhadap Penangkapan Hiu: Studi Kasus di Kabupaten Badung, Provinsi Bali Eriq Imanuel; I Gede Hendrawan; Ni Luh Putu Ria Puspitha
Journal of Marine and Aquatic Sciences Vol 4 No 2 (2018)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Shark is one of top predator that can define and control marine food chain. Shark breeding process is relatively slow and increase of catching activity has even given worse impact to shark population. Several endangered shark species has already protected the catch activity was banned. Some of them, such as Alopias superciliosus are found in Benoa and Kedonganan harbour. This condition happened because of not enough information and knowledge transfer to the local community about the protected species and catching regulation. Based on that information,the research about fishermen perception on shark conservation status and its correlation with the shark catch is important to be conducted. Data was collected using quisioner through interview approach. All the respondent is men with the age ranged from 16-67 years old, and 98% of respondent is labor. About 55% of the respondent graduated from elementary school. The result showed that the fisherman perception of shark conservation status categorized as good, while shark catch that is related with conservation in Badung district is categorized very good. The correlation of fisherman perception to shark conservation status with shark catching effort is negative, and significant to the shark catching effort (?=0,05) in Badung district. It means that if the fisherman perception to the shark conservation status in Badung district increased, so that the catch effort will be decrease.

Analisis Kualitas Perairan Pada Wilayah Perairan Pulau Serangan Bagian Utara Berdasarkan Baku Mutu Air Laut Ni Luh Gede Rai Ayu Saraswati; I Wayan Arthana; I Gede Hendrawan
Journal of Marine and Aquatic Sciences Vol 3 No 2 (2017)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Water quality monitoring is one of important activity, especially in coastal water, which susceptive with pollution. Water area of Serangan Island is a tidal flat area, influenced by fresh water and sea water inputs. The existence activities, such as cage aquaculture and tourism, and input from river, are threatened to decrease the water quality in north of Serangan water. This research was conducted to the condition of water quality based on water quality standard for aquatic organisms and its spatial distribution. The parameters measured were temperature, salinity, pH, DO, turbidity, and BOD5, in 8 sample points. Some parameters measured directly on water surface (temperature, salinity, pH and DO) and the others were analyzed in laboratory (turbidity, and BOD5). BOD5 was analyzed by standard method of Delzer & McKenzie. Based on research, the result of temperature values ranged from 28,9°C-30,5°C; salinity 29,6 ppt-32,7 ppt; pH 7,7-7,9; DO 3 mg/L-4,4 mg/L; turbidity 1,9 ntu-7,6 ntu; and BOD5 2,8 mg/L-5,4 mg/L. The water quality in Serangan had a different spatial distribution in each parameters. Overall, based on research result, the water quality condition in the body water of Serangan island was good and suitable to support aquatic organisms living.

Co-Authors Alan Frendy Koropitan Alexis Chappuis Andrianus Sembiring Ariandini, Yovita Astiti Ratnasari Bambang Sukresno Candra Saputra Cok Istri Yudhantari Devi Ulinuha Diana Paramita Ratnawati Dika Madyawan Dra. Ni Wayan Arini, M.Pd. . 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 Made Khrisna Putra Astaman I Dewa Made Krisna Putra Astaman I Dewa Nym. Nurweda P., I G. A. Widagda I Gede Dananjaya Bagaskara I Gede Surya Risuana 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 Wayan Arthana I Wayan Gede Astawa Karang I Wayan Matsya Deva Nagendra 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 Komang Bayu Permana Komang Indah Vitri Lestari Kuncoro Teguh Setiawan 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 Made Dewi Damayanti Ni Nyoman Raka Wulandari 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 Rizaldi Cahya Bramasta Samantha Julia Blandina Lumban Tobing Sartika Ristama Silitonga Sukarasa, I Ketut Susumu Kanno Timothy Kenoly WAYAN SANDI Widiastuti Karim Widiastuti Widiastuti Yasuhiro Sugimori Yasuhiro Sugimori YASUHIRO SUGIMORI Yasuo Furushima Yesie Rahayu Ananingtyas Yulianto Suteja

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