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All Journal Jurnal Teknologi Perikanan dan Kelautan Jurnal Ilmu dan Teknologi Kelautan Tropis Journal of Marine and Aquatic Sciences ILMU KELAUTAN: Indonesian Journal of Marine Sciences Majalah Geografi Indonesia Jurnal Kelautan : Indonesian Journal of Marine Science and Technology Al-Ahkam Jurnal Kelautan Tropis Panrita Abdi - Jurnal Pengabdian pada Masyarakat Journal of Applied Geospatial Information Jurnal Sumberdaya Akuatik Indopasifik Omni-Akuatika Dinamika Maritim Jurnal Ilmu Kelautan Kepulauan Jurnal Kelautan Nasional Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan Journal of Fisheries & Marine

Nyoman M N Natih

Department Of Marine Science & Technology, IPB University, Bogor 16880, Indonesia

Author-ID : 3360005

Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Library & Information Science Physics Other

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ETHNOOCEANOGRAPHY DAN TITIK TEMU ASPEK SYAR’I DALAM PENENTUAN AWAL BULAN RAMADHAN DAN SYAWAL OLEH JOGURU KESULTANAN TIDORE Salnuddin Salnuddin; I Wayan Nurjaya; Indra Jaya; Nyoman M.N Natih
Al-Ahkam Volume 27, Nomor 1, April 2017
Publisher : Faculty of Sharia and Law, Universitas Islam Negeri (UIN) Walisongo Semarang

Ethnooceanography and the intersection of shar'i aspects to determination of the early of Ramadan and Shawwal by Joguru Sultanate of Tidore. The determination of the early of the new month of Ramadan and Shawwal was very important for Muslims because it is related to the time of worship. Judge syara 'The Sultanate of Tidore (Joguru) has long applied the method of determining the early month of Hijri (Ramadan and Shawwal) through tidal movement observed on "akebai" included in ethooceanography and called Joguru Method (MJ). Hilal that has never been seen in Tidore and its surrounding areas in the long-term cycle of moon (34 years) caused its early moon to be inapplicable due to non-fulfillment of the requirement of hisab (hadith). MJ makes observation (rukyat) change of tidal movement on "akebai" is "ijtihād". The appropriateness of the scientific aspects of ethnoocaenography and the intersection of the shar'i aspects make it a comparative method of determining the beginning of the new month of Hijri in astronomy (hilāl). Required the expansion of the meaning of the “hilāl” as an indicator of the beginning of the month of the Hijri calendar.[]Ethnooceanography dan titik temu aspek Syar’i dalam penentuan awal bulan Ramadhan dan Syawal oleh Joguru Kesultanan Tidore. Penentuan awal bulan baru Ramadhan dan Syawal sangat penting bagi umat Islam karena berkaitan dengan waktu ibadah. Hakim syara’ Kesultanan Tidore (Joguru) telah lama mengaplikasikan metode penentuan awal bulan baru Hijriah (Ramadhan dan Syawal) melalui pergerakan pasang surut yang terpantau pada “akebai” termasuk dalam ethooceanography dan disebut dengan Metode Joguru (MJ). Hilal yang tidak pernah terlihat di wilayah Tidore dan sekitarnya selama siklus jangka panjang (34 tahun) menyebabkan hisab awal bulan tidak dapat diaplikasikan akibat tidak terpenuhinya persyaratan hisab (hadis). MJ melakukan pengamatan (rukyat) perubahan tinggi air pada “akebai” adalah “ijtihad”. Terdapat kesesuaian aspek sains dari ethnoocaenography serta titik temu aspek syar’i yang menjadikan MJ berpotensi sebagai metode utama sekaligus sebagai metode pembanding dari metode umum dalam penentuan awal bulan baru Hijriah. Diperlukan perluasan makna kata “hilal” sebagai indikator awal bulan baru penanggalan Hijriah.

TIDAL RANGE CALCULATION BASED ON THE LOCAL KNOWLEDGE OF THE SAMA ETHNIC GROUP IN THE EASTERN INDONESIA . Salnuddin; I Wayan Nurjaya; Indra Jaya; Nyoman M.N. Natih
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 7 No. 1 (2015): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

The Sama ethnic group (Bajo) is well known as “Indonesian marine people” that dominantly spreaded in coastal region of eastern Indonesian region. Their activities have been adapting with the territorial water as shown in the determination of their home floor height to prevent from the tidal flood. The purpose of this study was to examine the accuracy of the tidal range calculation by local knowledge of the Sama ethnic group (Sama Ethnic Method, SEM). The analysis was done by comparing tidal range result calculated by the Sama Ethnic Method (SEM) with the standardized tidal harmonic constituents. The result showed that the 2nd tidal peaks (DLB-s) in the 15th “Sya’ban” date was the best date to do measurement of a tidal range. In this case, the “Likkas Silapas” (LS) value at the above date was above the mean height water level (MHWL). Meanwhile, in other dates, the LS value was under MHWL value. The result also showed a strong correlation (R2> 90%) between rasio of tidal high on 1st and 2ndpeaks (DLB-s/DLB-m) on 15th Sya’ban date and LS-s value. The local knowledge of the Sama Ethnic Method to determine the tidal range was effective and scientifically proven. Keywords: the Sama Ethnic group, tidal range, Likkas Boe, Likkas Silapas, Sya’ban

DYNAMIC OF SEA LEVEL ANOMALY OF INDONESIAN WATERS Bisman Nababan; Sri Hadianti; Nyoman M.N. Natih
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 7 No. 1 (2015): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

A trend in sea level rise as a result of global warming could be a threat to small islands and coastal areas in Indonesia. The objective of this study was to determine the trend and variability of mean sea level anomaly (MSLA) in Indonesian waters during the 20 years of observation. The data used in this study were monthly MSLA data obtained from the AVISO website (ftp://ftp.aviso.oceanobs.com). Supporting data were the Southern Oscillation Index (SOI) (http://www.gom.gov.au/climate/enso), Dipole Indian Mode (DIM) index (http://gcmd.nasa.gov/records/GCMD_Indian_Ocean_Dipole.html), and the Pacific Decadal Oscillation (PDO) index (http://research.jisao.washington.edu/pdo/). Eigth stations of Indonesian waters were selected to study the variability of MSLA. In general, MSLA variabilities of Indonesian waters had a seasonal pattern, positively correlated with the SOI index, and negatively correlated with DIM and PDO indexes. The partial correlation of DIM was more dominant in west of Sumatra (r=-0.52) and south of Java (r=-0.44), PDO was more dominant in the northern waters of Papua (r=-0.37) and Makassar Strait (r=-0.33), and SOI was more dominant in northern Papua (r=0.52) and less toward the west of Indonesian waters. Overall, the MSLA variability of Indonesian waters can be explained by the variabilities of SOI, DIM, and PDO indexes with the lowest value in Natuna waters by 12% (R2=0.12) and the highest value in the northern waters of Papua by 54% (R2=0.54). Interannual variabilities were observed during ENSO events (SOI<-10) along with the maximum value of DIM index resulted in the lowest value of MSLA. Meanwhile, the highest value of MSLA was found during La Nina events (SOI>10) in conjunction with a minimum value of DIM and PDO indexes. The average rate of sea level rise in Indonesian waters was 5.84 mm/yr, almost two times higher than the average rate of global sea level rise (3.2 mm/yr). Keywords: mean sea level, anomaly, SOI, DIM, PDO, interannual, ENSO

POPULATION STRUCTURE AND MORPHOMETRY OF HORSESHOE CRAB Carcinoscorpius rotundicauda, Latreille 1802 IN KAMPUNG GISI COASTAL AREA OF BINTAN BAY OF RIAU ISLANDS PROVINCE Rika Anggraini; Dietriech G. Bengen; Nyoman Metta N. Natih
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 9 No. 1 (2017): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Horseshoe crab, Carcinoscorpius rotundicauda is frequently found in the coastal zone of Bintan Bay of Riau Islands Province. The study was conducted from August to September 2016 in coastal area of Kampung Gisi, Bintan bay. The aims of the study were to analyse the population structure and morphometric characters of horseshoe crab and its relation to the coastal environmental characteristics. Sampling of horseshoe crab was taken using belt transect method, and coastal environmental parameters were measured in-situ. The results show that b values of length-weight relationship were found to be 3.3 (male) and 2.6 (female) respectively. Furthermore, the growth pattern of males were positive allometric, and females were negative allometric. Horseshoe crab are closely related to sandy mudflats sediment, brackish water salinity and mangrove habitat distribution. Keywords: horseshoe crab, population structure, morphometry, environmental characteristics, Bintan Bay

ANALISIS HAMBUR BALIK AKUSTIK UNTUK KLASIFIKASI DAN PEMETAAN SUBSTRAT DASAR PERAIRAN DI TELUK YOS SUDARSO, KOTA JAYAPURA Baigo Hamuna; Sri Pujiyat; Nyoman Metta N. Natih; Lisiard Dimara
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 10 No. 2 (2018): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Penelitian ini bertujuan untuk mengkaji karakteristik kuat hambur balik akustik dasar perairan. Echosounder bim tunggal Simrad EK15 frekuensi 200 kHz digunakan untuk perekaman data hidroakustik yang dilaksanakan pada tanggal 29 April sampai 2 Mei 2017 di perairan Teluk Yos Sudarso, Kota Jayapura, Provinsi Papua. Pengambilan contoh substrat digunakan untuk data validasi menggunakan sedimen grab. Pengolahan data hasil rekaman akustik menggunakan satuan dasar pencuplikan sebesar 100 ping data perekaman dengan ambang batas nilai E1 adalah -50 dB dan E2 adalah -70 dB. Hasil penelitian menunjukkan bahwa terdapat perbedaan yang signifikan nilai hambur balik akustik antar tipe substrat dasar perairan. Nilai E1 karang -15,62 dB dan E2 -30,70 dB, untuk substrat pasir E1 berkisar antara -28,40 dB sampai -27,36 dB dan E2 berkisar antara -50,96 dB sampai -47,44 dB, sedangkan substrat lumpur E1 berkisar antara -37,81 dB sampai -35,99 dB dan E2 berkisar antara -62,85 dB sampai -54,12 dB. Ukuran butiran substrat sangat berpengaruh terhadap kuat hambur balik akustik dasar perairan. Berdasarkan hasil deteksi akustik, substrat karang berada pada kedalaman 2-3 m, substrat pasir pada kedalaman 2-10 m, dan substrat lumpur dominan pada kedalaman lebih dari 10 m.

ANALISIS POTENSI TSUNAMI DI LOMBOK UTARA Eva Susan Ratuluhain; I Wayan Nurjaya; Nyoman M. N. Natih
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 13 No. 1 (2021): Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitkt.v13i1.29336

The Flores Fault is the one of caused an earthquake on August 5, 2018 in Lombok Island. It is reported that this earthquake with magnitude of 7.0 Mw caused a small tsunami with amplitude of 13.5 cm in the coastal area of Carik village, North Lombok. This study aimed to simulate a potential tsunami hazard from the Flores faults activity using the COMCOT v1.7 tsunami model which estimates potential tsunami height, tsunami arrival time, and potential tsunami affected areas. Historical earthquake data as an epicenter in the simulation was the earthquake on September 2, 2018, with the earthquake magnitude of 7 Mw. On the basis of the earthquake above, the model parameters was chosen, such as the depth of epicenter of 14 km, width fault area of 47.9 x 15.9 km, dislocation of 2.5 m, strike of 284o, slip of 64o, and dip of 88o. Simulation layer is divided into 3 layers based on nesting grid system with 464 m, 232 m and 77 m resolution, respectively. Bathymetric data were obtained from GEBCO with a 15-arc second grid size. Tsunami propagation simulation has been performed for duration of 30 minutes, which produced an initial tsunami height of 0.9 m. The maximum tsunami height revealed from the simulation was between 1-2.5 m on land. Estimated arrival time of the tsunami in North Lombok was ftom 3 to 13 minutes. Simulation result showed that sub-district area of Bayan, Kayangan, Tanjung, and Gangga are affected potentially areas by the tsunami. The maximum height and arrival time of the tsunami in North Lombok have the potential to be destructive and can cause casualties, so that mitigation efforts are needed, such as socialization and training in dealing with tsunami hazards, planting coastal vegetation that is suitable for the substrate on the coast, and building offshore breakwaters.

Analysis of Characteristics and Turbulent Mixing of Seawater Mass in Lombok Strait Amir Yarkhasy Yuliardi; Agus S. Atmadipoera; Gentio Harsono; Nyoman Metta N. Natih; Kentaro Ando
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 26, No 2 (2021): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.26.2.95-109

The Lombok Strait, as one of the outlet straits, is part of the ITF route, which is directly adjacent to the Indian Ocean. There is a sill in the Lombok Strait, which is a place for internal wave generation. Leg-1 data from the Japan Agency for Marine-Earth Science and Technology in collaboration with the Agency for the Assessment and Application of Technology which is part of the Tropical Ocean Climate Study Expedition including CTD Yoyo and ADCP taken using ship vehicles R/V Kaiyo. CTD Snapshot from PUSHIDROSAL using the KRI Spica 934 vehicle part of the Opssurta Baruna Jaya 2 Expedition. Determination of seawater mass stratification with the criteria for the thermocline layer is ≥ 0.05 °C.m-1. Four types of water masses were identified, Java Sea, mixed seawater mass (Java Sea - ITF) which occurred diapycnal mixing, North Pacific Subtropical Water (NPSW) and North Pacific Intermediate Water (NPIW). The seawater mass stratification in the Lombok Strait based on temperature, salinity and density which are seen to follow the internal tidal pattern. The average values for energy dissipation and vertical diffusivity for each layer and replication were 5.73 x 10-7 W.Kg-1 and 3.67 x 10-2 m2.s-1 for CTD Yoyo and 2.25 x 10-6 W.Kg-1 and 7.38 x 10-2 m2.s-1 for CTD Snapshot. The value obtained is greater than the open ocean and straits in other studies. The high shear value confirms this in the thermocline layer. The Richardson gradient value> 0.25 is relatively constant in the thermocline layer.

Variation of Tidal Range Based On Hijra Calendar And Its Relation With Ethno-Oceanography of The Sama Tribe In Eastern Indonesia Salnuddin Salnuddin; I Wayan Nurjaya; Indra Jaya; Nyoman M.N Natih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 22, No 2 (2017): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Based on Ethno–Oceanography of the Sama tribe in Eastern Indonesia, they measured and determined tidal range when Sya’ban taking place. Why do they do so? The questions and objective of this study were intended to respond the scientific fundamental of Ethno-Oceanography of the Sama tribe. In order to achieve the objective of this study, the tidal range value in each Hijra month was compared and analyzed statistically (ANOVA). Tidal Analysis results showed that the tidal range at Sya’ban was higher and the deviation was lower than the other months. Moreover, ANOVA results showed that Sya’ban was significantly different (P<0.05) on Highest High Water Level (HHWL) throughout Hijra month. Keywords: Sama Tribe, Sya’ban, Hijra Calendar

Amplitude Variations of Tidal Harmonic Constituents in Bitung Station (Variasi Amplitudo Konstituen Harmonik Pasang Surut Utama di Stasiun Bitung) Salnuddin Salnuddin; I Wayan Nurjaya; Indra Jaya; Nyoman M N Natih
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 20, No 2 (2015): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Perhitungan konstituen harmonik pasang surut masih menggunakan metode konvensional, pengembangan metode dominan pada sistem komputasinya dan menggunakan sistem penanggalan Masehi. Penelitian ini bertujuan untuk mengetahui, apakah amplitudo konstituen harmonik yang dihitung dari pengelompokan data berdasarkan penanggalan Hijriah memberikan karakter yang relatif sama (stabil) dibulan yang sama dibandingkan dengan penanggalan Masehi. Perbandingan tersebut dilakukan pada 10 konstituen harmonik utama pasang surut, guna membandingkan perhitungan tunggang air dari nilai konstituen dan dari Metode Suku Sama (MSS). Hasil analisis data menunjukkan bahwa nilai deviasi amplitudo sangat kecil dari masing-masing konstituen harmonik pada perhitungan berdasarkan sistem kalender Hijriah, dimana amplitudo pada bulan Sya’ban relatif stabil dan lebih tinggi dibandingkan pada bulan lainnya. Nilai koefisien determinan (R2) untuk data awal pasang surut pada fase bulan baru (BB) dan bulan purnama (BP) lebih tinggi dibandingkan data awal pada fase bulan lainnya. ANOVAmenghasilkan konstituen K1dan S2terpengaruh jika data dimulai saat fase bulan kuartil I (KW1) dan purnama (BP), sedangkan saat fase awal kuartil 2 (KW2) terjadi pada konstituen P1 dan K2, MS4 dan M4. Dengan demikian, perhitungan amplitudo konstituen harmonik lebih optimum jika data dimulai saat fase bulan baru atau mengikuti penanggalan Hijriah.

Patterns and Tidal Characteristics of East Coast of Bintan Island, Riau Archipelago Province Mario Putra Suhana; I Wayan Nurjaya; Nyoman Metta N. Natih
Journal of Applied Geospatial Information Vol 2 No 1 (2018): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v2i1.642

Tide is one of the important factors that affect the oceanographic processes around widely as waters flow. Tides also give significant effects against the dynamic of coastal area. This research was conducted considering the importance roles of tides data against all oceanographic phenomenon that gives the effects on activities around the area of coastal waters. This research was conducted around the area of east coast of Bintan Island Riau Archipelago Province in December 2017. Tidal data is retrieved from the global tidal modelling uses MIKE 21. The results of the analysis show the range of tidal height on the east coast of Bintan Island during 2007-2017 is 0.70-3.50 m of height range with the average of mean sea level (MSL) is 2.20-2.60 m. Generally, tidal fluctuations on east coast of Bintan Island form an asymmetric pattern which is a common pattern occurring in any waters. The tidal type of the east coast of Bintan Island is mixed predominantly semi diurnal with the value of formzahl number in each station respectively is 1.19-1.44. The interesting phenomenon obtained from this research is during 2007-2017 the maximum of sea level height in each station tends to decrease, this is considered attractive because over the past 20 years earth surface temperature have tended to increase so that melting of ice in polar has implications for increasing of sea water volume. Keywords: Tide, harmonics component, oceanography, east coast of Bintan Island

Co-Authors Abdul Motalib Angkotasan Abdurrachman Baksir, Abdurrachman Achmad, M. Djanib Agus Atmadipoera Amir Yarkhasy Yuliardi Asep Sandra Budiman, Asep Sandra Baigo Hamuna Baigo Hamuna Baigo Hamuna Baigo Hamuna Baigo Hamuna Beale, Calvin S. Beginer Subhan Bisman Nababan Darmiyati Muksin Daud, Asmar Hi Dea Fauzia Lestari, Dea Fauzia Dedi Sugianto Dietriech Geoffrey Bengen Dondy Arafat Eko S Wibowo Endang Sunarwati Srimariana Erwin Maulana Ferawati Runtuboi Firdaut Ismail Gentio Harsono Husmayani, Wa Ode I Wayan Nurjaya Ikbal Marus Ikbal Marus, Ikbal Indra Jaya Indra Jaya Indra Jaya Irmalita Tahir Irmalita Tahir, Irmalita Ismail, Firdaut Joko Santoso Jonson Lumban Gaol Karman, Amirul Kemal Taj Kentaro Ando Khairunnisa Khairunnisa Kotta, Raismin Krisna Rendi Awalludin Leica Febby Shafitri Lisiard Dimara Mario Putra Suhana Marlis Yulianto Meutia Samira Ismet Mochamad Tri Hartanto Muhamad Gilang Arindra Putra Muhamad Gilang Arindra Putra Muhamad Muliadi Muhammad Agus Muljanto Najamuddin N Najamuddin Najamuddin, Najamuddin Nebuchadnezzar Akbar Neviaty P Zamani NEVIATY PUTRI ZAMANI Neviaty Putri Zamani Paembonan, Rustam E Rasidi, Rasidi Rastina Rastina Ratuluhain, Eva Susan Rika Anggraini Risandi Dwirama Putra Riyadi Subur, Riyadi Riza Aitiando Pasaribu Rustam E Paembonan Rustam Effendi Paembonan, Rustam Effendi Sallatu, Muh Ashry Salnuddin Salnuddin, Salnuddin Salnuddin, Salnudin Sartini Baddu Selviani, Selviani Septy Heltria Siolimbona, Abdul Ajiz Sri Hadianti Sri Pujiyat Sri Pujiyati Steven Solikin Syamsul Bahri Agus, Syamsul Bahri Syawaludin Alisyahbana Harahap Tarigan, Nurhayati Wahab, Iswandi Wahyu W Pandoe Wibowo, Eko S Zulfikar, Andi

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