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Numerical Simulation of Bed Level Changes Around Structure Due to Waves and Current Nurdjaman, Susanna; Putra, Prayoga Aryandi
Jurnal Teknik Sipil Vol 24, No 3 (2017)
Publisher : Institut Teknologi Bandung

AbstractInteractions between sediments in the marine environment with the dynamics of the ocean can generate sedimentÂ movement. Sedimentation and erosion is the result of these interactions, which often have a negative impact on theÂ harbor waters or coastal environment. The purpose of this research is to understand the process of sedimentÂ transport caused by the dynamics of currents and waves on the basis of morphological changes and the potentialÂ that can lead to scour for coastal protection structures (groin).Coupled model of hydrodynamic model, spectralÂ wave and sediment transport were conducted to study the pattern of sediment movement. Simulations carried out byÂ varying the waveform specification that propagates to the domain model. Verification of maximum velocity magnitudeÂ due to Van Rijn (1987), Nurdjaman and Ningsih (2003), and Adilantip (2012) shows good agreement with theÂ differences value below 5%. While verification of wave height and wave stress radiation with analytical calculationÂ shows good comparison with the mean of differences value 15%. The results of the study indicate that scour depthÂ of 0,955 m was formed at the end of the simulation by the discharge input only. When the discharge combined withÂ the various wave height and periods, scour depth increases by about 3 - 14%. Location of the scour depth coincidesÂ with the location of the maximum velocity at the tip of the groin structures to the left side.AbstrakInteraksi antara sedimen di lingkungan laut dengan dinamika laut dapat menghasilkan pergerakan sedimen. ProsesÂ sedimentasi dan erosi merupakan hasil dari interaksi tersebut yang tak jarang berdampak negatif terhadapÂ perairan pelabuhan ataupun lingkungan pesisir. Tujuan dari penelitian ini yaitu untuk memahami proses transporÂ sedimen yang diakibatkan oleh dinamika arus dan gelombang terhadap perubahan morfologi dasar dan potensinyaÂ yang dapat mengakibatkan gerusan terhadap struktur pelindung pantai (groin). Dilakukan model kopelÂ hidrodinamika, gelombang spektral, dan transpor sedimen untuk mempelajari pola pergerakan sedimen. SimulasiÂ dilakukan dengan memvariasikan perbedaan spesifikasi gelombang yang menjalar terhadap domain model.Â Simulasi dilakukan dengan memvariasikan spesifikasi waveform yang merambat ke model domain. VerifikasiÂ besarnya kecepatan aliran maksimum dari hasil model oleh Van Rijn (1987), Nurdjaman dan Ningsih (2003), danÂ Adilantip (2012) menunjukkan kesesuaian yang baik dengan perbedaan nilai di bawah 5%. Sedangkan verifikasiÂ tinggi gelombang dan radiasi tegangan gelombang dengan perhitungan analitik menunjukkan perbandingan yangÂ baik dengan rata-rata perbedaan nilai 15%. Hasil penelitian menunjukkan bahwa kedalaman gerusan 0,955 mÂ terbentuk pada akhir simulasi dengan input debit sungai saja. Bila ddebit sungai dikombinasikan dengan berbagaiÂ tinggi dan perioda gelombang, kedalaman gerusan meningkat sekitar 3 - 14%. Lokasi kedalaman gerusanÂ bertepatan dengan lokasi kecepatan aliran maksimum pada ujung struktur groin sisi kiri.

Numerical Simulation of Bed Level Changes Around Structure Due to Waves and Current Susanna Nurdjaman; Prayoga Aryandi Putra
Jurnal Teknik Sipil Vol 24 No 3 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2017.24.3.2

AbstractInteractions between sediments in the marine environment with the dynamics of the ocean can generate sediment movement. Sedimentation and erosion is the result of these interactions, which often have a negative impact on the harbor waters or coastal environment. The purpose of this research is to understand the process of sediment transport caused by the dynamics of currents and waves on the basis of morphological changes and the potential that can lead to scour for coastal protection structures (groin).Coupled model of hydrodynamic model, spectral wave and sediment transport were conducted to study the pattern of sediment movement. Simulations carried out by varying the waveform specification that propagates to the domain model. Verification of maximum velocity magnitude due to Van Rijn (1987), Nurdjaman and Ningsih (2003), and Adilantip (2012) shows good agreement with the differences value below 5%. While verification of wave height and wave stress radiation with analytical calculation shows good comparison with the mean of differences value 15%. The results of the study indicate that scour depth of 0,955 m was formed at the end of the simulation by the discharge input only. When the discharge combined with the various wave height and periods, scour depth increases by about 3 - 14%. Location of the scour depth coincides with the location of the maximum velocity at the tip of the groin structures to the left side.AbstrakInteraksi antara sedimen di lingkungan laut dengan dinamika laut dapat menghasilkan pergerakan sedimen. Proses sedimentasi dan erosi merupakan hasil dari interaksi tersebut yang tak jarang berdampak negatif terhadap perairan pelabuhan ataupun lingkungan pesisir. Tujuan dari penelitian ini yaitu untuk memahami proses transpor sedimen yang diakibatkan oleh dinamika arus dan gelombang terhadap perubahan morfologi dasar dan potensinya yang dapat mengakibatkan gerusan terhadap struktur pelindung pantai (groin). Dilakukan model kopel hidrodinamika, gelombang spektral, dan transpor sedimen untuk mempelajari pola pergerakan sedimen. Simulasi dilakukan dengan memvariasikan perbedaan spesifikasi gelombang yang menjalar terhadap domain model. Simulasi dilakukan dengan memvariasikan spesifikasi waveform yang merambat ke model domain. Verifikasi besarnya kecepatan aliran maksimum dari hasil model oleh Van Rijn (1987), Nurdjaman dan Ningsih (2003), dan Adilantip (2012) menunjukkan kesesuaian yang baik dengan perbedaan nilai di bawah 5%. Sedangkan verifikasi tinggi gelombang dan radiasi tegangan gelombang dengan perhitungan analitik menunjukkan perbandingan yang baik dengan rata-rata perbedaan nilai 15%. Hasil penelitian menunjukkan bahwa kedalaman gerusan 0,955 m terbentuk pada akhir simulasi dengan input debit sungai saja. Bila ddebit sungai dikombinasikan dengan berbagai tinggi dan perioda gelombang, kedalaman gerusan meningkat sekitar 3 - 14%. Lokasi kedalaman gerusan bertepatan dengan lokasi kecepatan aliran maksimum pada ujung struktur groin sisi kiri.

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

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

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.

PENGELOLAAN DAN PEMANFAATAN KAWASAN PESISIR PULAU MIANGAS SEBAGAI PULAU KECIL TERLUAR INDONESIA Nagi, Achmad; Jamaluddin, Jamaluddin; Napitupulu, Gandhi; Nurdjaman, Susanna; Setyobudiandi, Isdradjad; Radjawane, Ivonne Milichristi
Jurnal Kebijakan Perikanan Indonesia Vol 15, No 1 (2023): (Mei) 2023
Publisher : Pusat Riset Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jkpi.15.1.2023.%p

Pulau Miangas merupakan salah satu pulau terluar yang berbatasan dengan negara Filipina dan terletak di wilayah administratif Kabupaten Kepulauan Talaud di Provinsi Sulawesi Utara. Sumber daya alam yang ada memiliki potensi yang besar untuk pemanfaatan wilayah pesisir dan laut yang dimilikinya. Tujuan dari penelitian ini adalah menganalisis potensi, kelayakan dan prioritas komersial untuk pemanfaatan sumber daya pesisir Pulau Miangas. Survei dengan pengamatan secara langsung dan metode wawancara digunakan untuk mengumpulkan data dan informasi. sedangkan metode analisis sistem informasi geografis (SIG) digunakan untuk mengevaluasi kelayakan penggunaan lahan di wilayah pesisir. Melalui empat tahapan analisis yang meliputi penyusunan peta wilayah, matriks cakupan per kategori, pemberian bobot dan scoring, serta analisis spasial. Hasil analisis kesesuaian lahan dengan menggunakan SIG menunjukkan bahwa kawasan pesisir Pulau Miangas memiliki potensi untuk berbagai program pembangunan terkait pengelolaan dan pemanfaatan pesisir, seperti kawasan pemukiman, kawasan budidaya rumput laut, kawasan penangkapan ikan, kawasan budidaya keramba jaring apung, budidaya mutiara dan konservasi terumbu karang.Miangas Island is one of the outermost islands bordering the Philippines and is located in the administrative area of the Talaud Islands Regency in North Sulawesi Province. The existing natural resources have great potential for the utilization of coastal and marine areas. The purpose of this study was to analyze the potential, feasibility and commercial priorities for the utilization of coastal resources of Miangas Island. Direct observation surveys and interview methods were used to collect data and information, while geographic information system (GIS) analysis methods were used to evaluate the feasibility of land use in coastal areas. Through four stages of analysis that include the preparation of area maps, coverage matrix per category, weighting and scoring, and spatial analysis. The results of the land suitability analysis using GIS show that the coastal area of Miangas Island has the potential for various development programs related to coastal management and utilization, such as residential areas, seaweed cultivation areas, fishing areas, floating net cage cultivation areas, pearl cultivation and coral reef conservation.

ANALISIS KESESUAIAN PENEMPATAN KERAMBA JARING APUNG IKAN KERAPU DI SELAT MADURA: PERTIMBANGAN KUALITAS AIR LAUT Muhammad, Iqbal; Nurdjaman, Susanna
Jurnal Kebijakan Perikanan Indonesia Vol 16, No 1 (2024): (Mei) 2024
Publisher : Badan Penyuluhan dan Pengembangan Sumberdaya Manusia Kelautan dan Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jkpi.16.1.2024.51-60

Budidaya perikanan sangatlah penting untuk menyeimbangkan produksi ikan yang ada di Indonesia yang saat ini terlalu mengandalkan pada sektor perikanan tangkap. Salah satu alternatif budidaya perikanan adalah dengan keramba jaring apung (KJA). Ikan kerapu merupakan komoditas yang cocok untuk budidaya dengan KJA. Dalam penelitian ini, dilakukan uji kelayakan kualitas air laut sekitar perairan di Selat Madura dengan menggunakan standar baku mutu kualitas air laut untuk ikan kerapu, selanjutnya dilakukan pemetaan kesesuaian lokasi untuk budidaya dengan metode KJA. Data yang digunakan adalah data kualitas air laut dari Marine Coppernicus pada tahun 2021. Kesesuaian lokasi perairan untuk budidaya KJA dikategorikan menjadi 3 kelompok yaitu sangat sesuai (S1), sesuai (S2), dan tidak sesuai (N). Dari hasil pemetaan lokasi kesesuaian perairan untuk budidaya ikan kerapu dengan KJA di Selat Madura, menunjukkan bahwa bagian barat Selat Madura yang meliputi: perairan sekitar Pasuruan, Sidoarjo, Surabaya, Bangkalan, sebagian pesisir Probolinggo dan Sampang masuk pada kategori sesuai (S2) dengan rata-rata skor 56,4 sedangkan untuk perairan sekitar Situbondo, Pamekasan, Sumenep dan sebagian pesisir Probolinggo dan Sampang masuk pada kategori sangat sesuai (S1) dengan rata-rata skor 71,6. Kesesuaian tersebut sangat dipengaruhi beberapa parameter penting seperti batimetri dan kecerahan di daerah tersebut.Fish farming plays a crucial role in Indonesia's efforts to manage its fish production, especially considering the heavy reliance on the capture fisheries sector. One promising method in fish farming involves using floating net cages, known locally as Keramba Jaring Apung (KJA). Grouper fish (Epinephelus fuscoguttatus) are particularly suitable for cultivation using KJA. This study examined the feasibility of seawater quality in the Madura Strait area by applying standard quality criteria tailored for grouper fish. Additionally, it mapped out suitable locations for KJA-based cultivation. The data utilized in this study included seawater quality data from Marine Copernicus for the year 2021. The suitability of locations for KJA farming was classified into three categories: highly suitable (S1), suitable (S2), and not suitable (N). Mapping results revealed that the western part of the Madura Strait, including Pasuruan, Sidoarjo, Surabaya, Bangkalan, and parts of Probolinggo and Sampang coastal areas, fell into the suitable (S2) category with an average score of 56.4. Conversely, Situbondo, Pamekasan, Sumenep, and parts of Probolinggo and Sampang coastal areas were classified as highly suitable (S1) with an average score of 71.6. The suitability of these locations is influenced significantly by crucial parameters such as bathymetry and water clarity in the respective areas.

Briket Batok Kelapa, Energi Alternatif Ramah Lingkungan bagi Desa Kote, Kabupaten Lingga, Kepulauan Riau Nurdjaman, Susanna; Abdullah, Faizal; Cahya, Brian; Al-Ghifari, Khalid; Nur, Syarifudin
Agrokreatif: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 11 No. 2 (2025): Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrokreatif.11.2.276-285

Kote Village, located on Singkep Island in Riau Islands Province, has the potential to utilize coconut shell briquettes as a sustainable alternative energy source. Singkep Island is known for its extensive coconut trees and is a key component of the local economy. A considerable amount of coconut shell waste remains unutilized. Much of this waste is either discarded or burned without use. This underutilized potential offers an opportunity for briquette production, providing a sustainable energy solution for the village community. This community service initiative aims to reduce a region's dependence on conventional energy sources by converting coconut shell waste into briquettes. The implementation method included prototyping a pyrolysis device in Bandung, reconstructing the equipment in Kote Village, and conducting a workshop for the local community. The results show that the briquettes produced are of good quality and have a high calorific value, and the resulting liquid smoke can be used as a natural fish preservative. This initiative analyzes the environmental and economic benefits of coconut shell briquettes, demonstrating that they offer an efficient alternative energy source that can reduce environmental impact and enhance local energy resilience. Furthermore, it emphasizes the potential for local production, empowering villagers to achieve energy independence while supporting the regional economy. This method helps minimize waste while offering a replicable solution for other villages.

Asesmen Temporal Degradasi Lamun di Pesisir Kepulauan Riau, Indonesia Nur, Syarif; Nurdjaman, Susanna
Coastal and Ocean Journal (COJ) Vol 9 No 1 (2025): COJ (Coastal and Ocean Journal)
Publisher : Pusat Kajian Sumberdaya Pesisir dan Lautan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/coj.v9i1.61813

Seagrass plays a crucial role in coastal ecosystems, necessitating its preservation to maintain ecosystem health. This study addresses the degradation of seagrass meadows in the coastal regions of the Riau Islands, Indonesia, utilizing remote sensing techniques and spatial data analysis. Satellite imagery offers a cost-effective means of monitoring seagrass health in shallow coastal waters. In October 2020, the research team conducted the study at six stations—four on Lingga Island and two on Singkep Island. Utilized Sentinel-2 satellite imagery from 2019 and applied the Depth Invariant Index (DII) along with Support Vector Machine (SVM) classification. In-situ observations, conducted simultaneously, validated the satellite data and facilitated seagrass accuracy assessment, including species identification using the Seagrass-Watch (Transect Quadrant) methodology. The results reveal significant seagrass degradation in the Riau Islands. The DII method detected extensive seagrass losses, covering approximately 175 km2 of seagrass meadows across Lingga and Singkep Islands. Species identification confirmed the presence of Halophila ovalis, Halophila minor, Thalassia hemprichii, and identified Enhalus acoroides as the dominant species. This research gives important insights into the temporal degradation of seagrass environments along the coastal regions of the Riau Islands, highlighting the importance of continued monitoring and preservation efforts.

Rumah Garam Daur Ulang Atasi Impor Garam dan Solusi Banjir Rob di Pantura, Jawa Barat nurdjaman, Susanna -; Radjawane, Ivonne M; Taofiqurohman, Ankiq -; Khoirunnisa, Qonitah; Hudzaifah, Hudzaifah; Wulandari, Suci; Septian, Adhi; Umaro, Dimaz Akbar
Farmers : Journal of Community Services Vol 7, No 1 (2026): Farmers: Journal of Community Services
Publisher : Unpad Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/fjcs.v7i1.67550

Wilayah Pantai Utara (Pantura) Jawa Barat masih menghadapi dua permasalahan utama, yaitu ketergantungan pada impor garam akibat produksi lokal yang terbatas serta ancaman banjir rob yang merusak infrastruktur dan mengganggu mata pencaharian. Untuk menjawab hal tersebut, kegiatan pengabdian masyarakat ini memperkenalkan Recycle Salt House, fasilitas produksi garam yang dibangun dari botol plastik bekas sebagai solusi berbiaya rendah dan ramah lingkungan. Desain bertingkat memungkinkan rumah garam tetap berfungsi saat banjir rob sekaligus mendukung pengelolaan limbah plastik. Melalui kegiatan sosialisasi, persiapan, pelatihan, dan pendampingan, program ini berhasil membangun rumah garam di Desa Bungko Lor, Kabupaten Cirebon, yang telah menghasilkan garam pada uji coba awal. Keterlibatan KUD Mina Jaka Bhakti dan pemuda pesisir menunjukkan potensi program ini dalam meningkatkan produksi garam lokal, memberdayakan masyarakat, serta mendukung keberlanjutan lingkungan di wilayah pesisir.

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