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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Indonesian Journal of Geography JURNAL PESISIR DAN LAUT TROPIS BULETIN OSEANOGRAFI MARINA Jurnal Kelautan Tropis Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil BULLETIN OF THE MARINE GEOLOGY Limits: Journal of Mathematics and Its Applications Jurnal Kebijakan Perikanan Indonesia ComTech: Computer, Mathematics and Engineering Applications Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil
Gandhi Napitupulu
Department of Earth Sciences, Institut Teknologi Bandung, Jl. Ganesa No.10, Lb. Siliwangi, Kecamatan Coblong, Kota Bandung 40132
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Engineering Environmental Science Immunology & microbiology Library & Information Science Mathematics

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Utilization of the coastal area of Miangas Island as the outermost small island of Indonesia Jamaluddin Jamaluddin; Achmad Nagi; Gandhi Napitupulu; Isdradjad Setyobudiandi; Mujizat Kawaroe
Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil Vol 7, No 1 (2023)
Publisher : Sekolah Tinggi Ilmu Pertanian Wuna

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29239/j.akuatikisle.7.1.85-92

Abstract

Miangas Island is one of the outer islands of Indonesia. Determining policies for optimal and sustainable spatial use of coastal areas on Miangas Island requires a deep understanding of the people who live there. Observation survey and interview methods were used to collect primary data. The analysis used is the Analytical Hierarchy Process (AHP) to formulate solutions to land use conflicts in coastal and marine areas. The results of the analysis of conflict resolution on the use of coastal space using AHP show that the criteria that have a large influence on the purpose of conflict resolution analysis are land availability and suitability, and the first priority for alternative spatial development for the coastal area of Talaud Islands Regency is the development of fishery areas.
Kajian Perilaku Gelombang Akibat Adanya Struktur Tiang Pancang Silinder melalui Analisis Spektrum Energi Gandhi Napitupulu; Totok Suprijo; Faruq Khadami; Faizal Ade R. Abdullah; Hening Sesami; Poerbandono; Adi Prasetyo; Juventus Ginting; Eduardo Simanjuntak
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 15 No. 1 (2023): 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.v15i1.42612

Abstract

Struktur pemecah gelombang banyak dimanfaatkan untuk perlindungan pantai dari hantaman gelombang laut yang berpropagasi ke daerah pesisir pantai. Salah satu inovasi pemecah gelombang yang sedang dikembangkan yaitu struktur tiang pancang. Tiang pancang merupakan replikasi batang pohon bakau yang dapat meredam energi gelombang. Tujuan dalam penelitian ini untuk menganalisis efektivitas struktur tiang pancang dengan menganalisis perilaku gelombang sebelum dan sesudah bertabrakan dengan struktur tiang pancang berdasarkan pembagian teori gelombang. Simulasi laboratorium fisik telah dilakukan untuk mendapatkan data gelombang yang berinteraksi dengan struktur tiang pancang. Selanjutnya, dilakukan analisis spektrum energi untuk menentukan spektrum energi gelombang datang, refleksi dan transmisi dari pengukuran wave probe berupa data time series. Masing-masing spektrum energi digunakan untuk melihat kemampuan refleksi dan transmisi dari struktur tiang pancang dari koefisien refleksi dan transmisi. Nilai koefisien refleksi dan transmisi diestimasi dengan persamaan polinomial derajat tiga menghasilkan dan dengan variabel parameter dasar gelombang yaitu tinggi gelombang, periode gelombang dan kedalaman perairan. Titik kritis dari persamaan polinomial menunjukkan nilai koefisien refleksi dan transmisi minimum ketika berada pada daerah Cnoidal dan maksimum ketika berada pada daerah Stokes orde-2.
Utilization of the coastal area of Miangas Island as the outermost small island of Indonesia Jamaluddin Jamaluddin; Achmad Nagi; Gandhi Napitupulu; Isdradjad Setyobudiandi; Mujizat Kawaroe
Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil Vol 7, No 1 (2023)
Publisher : Sekolah Tinggi Ilmu Pertanian Wuna

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29239/j.akuatikisle.7.1.85-92

Abstract

Miangas Island is one of the outer islands of Indonesia. Determining policies for optimal and sustainable spatial use of coastal areas on Miangas Island requires a deep understanding of the people who live there. Observation survey and interview methods were used to collect primary data. The analysis used is the Analytical Hierarchy Process (AHP) to formulate solutions to land use conflicts in coastal and marine areas. The results of the analysis of conflict resolution on the use of coastal space using AHP show that the criteria that have a large influence on the purpose of conflict resolution analysis are land availability and suitability, and the first priority for alternative spatial development for the coastal area of Talaud Islands Regency is the development of fishery areas.
Pemetaan Zona Potensial Penangkapan Ikan Tongkol di Perairan Teluk Banten Achmad Nagi; Gandhi Napitupulu; Ivonne Milichristi Radjawane; Susanna Nurdjaman; Dedi Supriadi; Dewi Nurhayati
Buletin Oseanografi Marina Vol 12, No 3 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i3.50374

Abstract

Ikan Tongkol (Euthynnus affinis) adalah komoditas di perairan Teluk Banten yang memiliki nilai produksi tinggi. Potensi ini bisa dimanfaatkan secara maksimal melalui pengetahuan tentang Zona Potensial Penangkapan Ikan (ZPPI). Penelitian ini bertujuan untuk menganalisis hubungan antara parameter oseanografi (suhu permukaan laut (SPL) dan klorofil-a) dan hasil tangkapan Ikan Tongkol, serta membuat pemetaan ZPPI Ikan Tongkol pada tahun 2014-2019. Prediksi ZPPI dilakukan melalui pendekatan parameter oseanografi berdasarkan citra satelit dan data hasil tangkapan Ikan Tongkol. Rata-rata tertinggi produksi Ikan Tongkol tahun 2014-2019 di Teluk Banten diperoleh selama musim peralihan I dengan SPL 29,92C – 30,98C dan konsentrasi klorofil-a 0,99 – 1,13 mg/m³. Analisis pengaruh SPL dan klorofil-a pada tangkapan dilakukan dengan regresi berganda. Pengaruh SPL dan klorofil-a terhadap hasil tangkapan dinilai cukup kuat berdasarkan dari koefisien korelasi () 0,743 dan koefisien determinasi () sebesar 0,551. Nilai  dapat memberikan penjelasan bahwa SPL dan klorofil-a mempengaruhi hasil tangkapan sebesar 55,1%. Melalui Analisis Wavelet diperoleh persebaran klorofil-a dominan dipengaruhi faktor monsun sedangkan pengaruh IOD (Indian Ocean Dipole) dan ENSO (El Niño–Southern Oscillation) lemah, sehingga pemetaan ZPPI disusun berdasarkan empat musim. ZPPI yang memiliki potensi lokasi terbanyak diperoleh pada musim barat sejumlah 13 titik. Selanjutnya, berkurang pada musim peralihan I sebanyak 10 titik, musim peralihan II sebanyak 6 titik, dan musim timur sebanyak 4 titik.   Mackarel Tuna (Euthynnus affinis) is a commodity in Banten Bay waters that has high production value. This potential can be maximally utilized through knowledge of the Potential Fishing Zone (). This study aims to analyze the relationship between oceanographic parameters (sea surface temperature (SST) and chlorophyll-a) and the catch of Mackarel Tuna, and create PFZ mapping of Mackarel Tuna in 2014-2019. The prediction of PFZ is done through the approach of oceanographic parameters based on satellite imagery and catch data. The highest average production of Mackarel Tuna in 2014-2019 in Banten Bay was obtained during transitional season I with a SST of 29.92°C - 30.98°C and a chlorophyll-a concentration of 0.99 - 1.13 mg/m³. Analysis of the effect of SST and chlorophyll-a on catch was done with multiple regression. The influence of SST and chlorophyll-a on catch was considered quite strong based on the correlation coefficient () of 0.743 and the coefficient of determination () of 0.551. The  value can provide an explanation that SST and chlorophyll-a affect the catch by 55.1%. Through Wavelet Analysis, it is obtained that the distribution of chlorophyll-a is dominantly influenced by monsoon factors while the influence of IOD (Indian Ocean Dipole) and ENSO (El Niño-Southern Oscillation) is weak, so that  mapping is organized based on four seasons. The  that has the most potential locations is obtained in the west season with 13 points. Furthermore, it decreases in the first transition season with 10 points, the second transition season with 6 points, and the eastern season with 4 points.
Impact of Climate Change on Coral Reefs Degradation at West Lombok, Indonesia Susanna Nurdjaman; Muhammad Ikram Nasution; Ofri Johan; Gandhi Napitupulu; Ejria Saleh
Jurnal Kelautan Tropis Vol 26, No 3 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i3.18540

Abstract

Coral reefs are one of the ecosystems that provide economic and environmental benefits to coastal communities in Indonesia. However, coral reef ecosystems are also one of the ecosystems threatened by climate change at the local scale. The waters of North Sekotong, West Lombok, Indonesia, are a tropical coastal system with beautiful coral reefs and marine ecosystems. Coral reef damage has been widespread in this area due to increased water temperatures. Increased water temperature results in coral reef degradation. Field surveys were conducted on May 23-28, 2016, in collaboration with the Marine and Coastal Resources Research and Development Center, Ministry of Marine Affairs and Fisheries, and coral reef mapping using Landsat 7 and Landsat 8 during 2002 - 2016 as well as processing monthly sea surface temperature (SST) data from the AquaModis and Oi SST V2 satellites and daily SST data from the NOAA Coral Reef Watch satellite. Changes in coral cover area were compared with temperature changes due to climate change. The increase in temperature creates a hotspot phenomenon in the coral reef ecosystem, resulting in coral reef degradation. The results showed that coral reefs in this area have degraded by 17.55% or 78.21 Ha from 455.68 Ha (2002) to 367.46 Ha (2016), with a degradation rate of 2.8 Ha/year in 2002 - 2014; 8.1 Ha/year (2014 - 2014) and 36 Ha/year (2015 - 2016) caused by an increase in SST which caused a hotspot phenomenon with a high enough intensity that there was an increase in temperature in 2016 which reached 9.77oC.
RESPON SINGKAT KONSENTRASI KLOROFIL-A TERHADAP PERUBAHAN ARUS EDDY PERMUKAAN DI WILAYAH PERAIRAN TELUK TOLO DAN SEKITARNYA Gandhi Napitupulu; Annisa Aulia Lukman; Rahaden Bagas Hatmaja; Aditya Rakhmat Kartadikaria; Ivonne Milichrisiti Radjawane; Ananda Vista Millina; M Apdillah Akbar; Moses Napitupulu
JURNAL GEOLOGI KELAUTAN Vol 22, No 1 (2024)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.22.1.2024.877

Abstract

Upwelling, sebuah proses oseanografi yang sangat penting, memperkaya air permukaan dengan massa air yang kaya nutrisi dari lapisan yang lebih dalam. Upwelling dapat terjadi sebagai respon dari dinamika arus eddy, dan ini kami temukan salah satunya di perairan Teluk Tolo dan sekitarnya. Penelitian ini menganalisis pengaruh arus eddy terhadap upwelling di wilayah tersebut dengan menggunakan data citra satelit dari Copernicus Marine Environment Monitoring Service (CMEMS),  Copernicus Climate Change Service (C3S) dan model klimat dari ECMWF Reanalysis v5 (ERA 5). Data suhu permukaan laut (SST), klorofil-a permukaan laut (SSC), tinggi permukaan laut (SSH), dan angin permukaan laut (SSW) digunakan untuk memahami bagaimana arus eddy memengaruhi upwelling di wilayah kajian selama periode 15 tahun pengamatan (tahun 2006 hingga 2020). Hasil penelitian menunjukkan jumlah arus eddy yang terbentuk adalah 341 buah (195 buah untuk eddy siklonik (CE) dan 146 buah untuk eddy antisiklonik (AE)). Jumlah maksimum CE (AE) ditemukan pada bulan Januari dan Juni (bulan Juli dan Oktober) serta minimum pada bulan September (bulan Mei). CE menyebabkan anomali negatif SST serta anomali positif SSC dengan perubahan signifikan setelah dua hari CE terbentuk. Karakteristik anomali SST dan SSC pada CE didukung melalui nilai EPV (Ekman pumping velocity) positif (maksimum 3,5x10-6 m/s) yang mengindikasikan adanya upwelling. Sedangkan AE menyebabkan anomali positif SST serta anomali negatif SSC, dan mulai berubah tiga hari setelah AE terbentuk dengan nilai EPV negatif (minimum -1,1x10-6 m/s) yang menandakan adanya downwelling. Pengaruh eddy pada perairan Teluk Tolo dan sekitarnya terhadap upwelling lebih dominan dibandingkan dengan pengaruh angin pada bulan Juni, Juli, dan Agustus.
SEASONAL AND INTRA-SEASONAL VARIABILITY OF OCEAN THERMAL POTENTIAL ENERGY IN THE INDONESIAN EXCLUSIVE ECONOMIC ZONE Totok Suprijo; Gandhi Napitupulu; Nining Sari Ningsih; Denny Basardo Jonatan Sinaga; Audi Rachman
BULLETIN OF THE MARINE GEOLOGY Vol 39, No 1 (2024)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.39.1.2024.866

Abstract

Ocean thermal energy is a promising marine renewable energy resource that can be developed as a clean energy alternative for Indonesia, which is in the equatorial or tropical region. This study assesses the potential of ocean thermal energy as a renewable energy source in the Indonesian Exclusive Economic Zone (EEZ) by estimating the monthly, seasonal, and intra-seasonal variability of ocean thermal energy conversion (OTEC) resources. The Indonesian EEZ spans from 6°N to 11°S and 95°E to 139°E, covering an area of 3,495,698.72 km². Using temperature data from simulations of the Hybrid Coordinate Ocean Model (HYCOM), the study evaluates the potential of OTEC resources over a 50-year period (from January 1964 to December 2013) with a spatial resolution of 0.125°. Estimation of OTEC potential power resources was based on temperature differences at depths of 20 m and 1000 m, following the hybrid cycle working principle.The results of the estimations indicate that the area has a monthly average potential power of 289.73 GW. The estimation also reveals seasonal and intra-seasonal variability in this potential energy, with fluctuations ranging from 280.09 GW in August to 295.65 GW in December, influenced by phenomena such as ENSO (El Niño Southern Oscillation) and IOD (Indian Ocean Dipole). In the Indonesian EEZ, the average potential thermal power decreases to 288.23 GW during an El Niño event and increases to 291.72 GW during a La Niña event. The IOD phenomenon has a similar effect, with potential decreasing to 281.82 GW during a positive IOD event and rising to 292.64 GW during a negative IOD event.
The One-Dimensional (1D) Numerical Model: An Application to Oxygen Diffusion in Mitochondria Cell Gandhi Napitupulu; Achmad Nagi; Mutiara Rachmat Putri; Ivonne Milichristi Radjawane
ComTech: Computer, Mathematics and Engineering Applications Vol. 14 No. 2 (2023): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v14i2.9705

Abstract

The first model of oxygen transport was formulated by August Krogh. However, the investigations conducted have yet to yield a complete analytical model and a widely applicable solution for One-Dimensional (1D) network construction. The research sought to provide numerical and analytical solutions for the oxygen transfer model in mitochondrial cells to enable researchers to estimate the molecular dynamics and diffusion characteristics in mitochondrial cells. The oxygen diffusion process in mitochondria was modeled with ID numerical models. The numerical models used to solve the equations were explicit and implicit. The explicit model consisted of Forward Time Center Space (FTCS) and DuFort-Frankel. Meanwhile, the implicit model had Crank-Nicholson and Laasonen. The numerical solutions of the explicit and implicit were divided into four scenarios with a variation of Δt and compared with the analytical solutions. The results show that the Laasonen method is the best in describing the diffusion process. The best scenario with the lowest slope value and small Root Mean Square Error (RMSE) value is scenario 2 (Δt = 3,33E-4 s and Δx = 2,00E-5 cm). The numerical model and analytical solution show that the time required to reach a steady state is 0,7 s. It indicates oxygen exchange in two sides of the mitochondrial cell after 0,7 s.
VARIABILITY ANALYSIS OF SIGNIFICANT WAVE HEIGHTS AND WIND WAVES IN RIAU ARCHIPELAGO SEA PART ALKI 1 Gandhi Napitupulu; Ayi Tarya; I Gede Merta Yoga Pratama; Ignatius Sonny Winardhie
JURNAL PESISIR DAN LAUT TROPIS Vol. 10 No. 3 (2022): JURNAL PESISiR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.10.3.2022.55019

Abstract

The Riau Archipelago Sea is part of the Indonesian Archipelago Sea Lane (ALKI) 1, with a very high intensity of crossing ships. Analysis of surface wind speed and significant wave height is the most important for the safety and performance of offshore shipping. This research aims to study wave characteristics and wind speed by identifying the main factors that affect significant wave height and surface wind speed. Dominant factors that affect significant wave height and wind speed are needed to decide on the safest path and the best time before crossing in ALKI-1. Temporal and spatial analysis of the seasonal variability of significant wave height and wind speed using ECMWF data for 18 years. The data used are significant wave height data and wind speed every 6 hours during the period 2000 – 2018. Three observation points are used for temporal analysis, it is found that significant wave height and wind speed are influenced by two main factors, namely MJO and Monsoon. Maximum significant wave height and wind speed that occurs in the SON period for points 3 and the DJF period at points 1 and 2. MJO affects directly from phases one to eight for observation points 1, 2, and 3. The 4, 7, and 8 MJO phases affect the value of wave height and wave speed significantly, and the 1, 2, and 5 MJO phases affect wave height and wind speed weakly. Keywords: ALKI 1, MJO, MJO phase, Monsoon, Significant wave height, Wind speed.
Pelacakan Mundur Partikel Sampah dengan Metode Euler-Lagrange di Pelabuhan Ratu Ivonne Milichristi Radjawane; Ilyas Nurfadhil Basuki; Gandhi Napitupulu
Limits: Journal of Mathematics and Its Applications Vol 20, No 3 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/limits.v20i3.18676

Abstract

Masalah yang sering dijumpai pada daerah pesisir adalah banyaknya sampah terapung. Salah satu Kawasan pesisir yang akan menjadi daerah kajian studi ini adalah daerah pariwisata Pelabuhan Ratu yang terletak di bagian Barat Daya pulau Jawa. Tujuan studi ini adalah untuk melakukan pelacakan mundur untuk mencari sumber sampah laut yang berada di Teluk Pelabuhan Ratu. Model hidrodinamika 2 dimensi horizontal digunakan untuk simulasi arus laut dan melacak masing-masing sampah laut sebagai partikel secara mundur terhadap waktu dengan metode Euler-Lagrange. Data input model berupa data batimetri, posisi sampah, kecepatan angin, dan elevasi pasang surut. Hasil trayektori (lintasan) menunjukkan kesesuaian antara hasil pelacakan maju dan pelacakan mundur di mana sebagian besar partikel yang dilacak mundur berakhir di posisi yang dekat dengan posisi awal pelacakan maju. Hasil simulasi juga menunjukkan kesesuaian dalam perpindahan partikel dengan perhitungan manual dan pola trayektori partikel yang berbentuk elips juga sesuai dengan teori arus pasang surut (pasut). Hasil pelacakan mundur partikel di dalam Teluk Pelabuhan Ratu menghasilkan trayektori yang sangat pendek akibat arus yang sangat kecil yang mengindikasi sampah di dalam teluk berasal dari daerah pesisir teluk. Partikel yang bergerak ke arah timur akan diperpanjang trayektorinya pada musim barat dan pada musim timur, partikel yang bergerak ke arah barat diperpanjang trayektorinya.
Co-Authors Abdillah, Muhammad Rais Achmad Nagi Achmad Nagi Achmad Nagi Adi Prasetyo Aditya Rakhmat Kartadikaria Ananda Vista Millina Annisa Aulia Lukman Audi Rachman Ayi Tarya Dedi Supriadi Denny Basardo Jonatan Sinaga Dewi Nurhayati Eduardo Simanjuntak Ejria Saleh Faizal Ade R. Abdullah Faruq Khadami Hassan, Mohd Azamuddin Mohd Hening Sesami I Gede Merta Yoga Pratama Ignatius Sonny Winardhie Ilyas Nurfadhil Basuki Isdradjad Setyobudiandi Isdradjad Setyobudiandi Ivonne Milichrisiti Radjawane Ivonne Milichristi Radjawane Ivonne Milichristi Radjawane Ivonne Milichristi Radjawane Jamaluddin Jamaluddin Jamaluddin Jamaluddin Juventus Ginting Kuswardani, Anastasia Rita Tisiana Dwi M Apdillah Akbar Moses Napitupulu Muhammad Ikram Nasution Mujizat Kawaroe Mutiara Rachmat Putri Nagi, Achmad Nining Sari Ningsih Nurdjaman, Susanna Ofri Johan Poerbandono, Poerbandono Radjawane, Ivonne Milichristi Rahaden Bagas Hatmaja Saleh, Ejria Susanna Nurdjaman Susanna Nurdjaman Totok Suprijo Totok Suprijo Yusarita, Alvi