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Distribution of Sea Surface Temperature and Salinity in the Karimata Strait Yuliardi, Amir Yarkhasy; Firdaus, Randi; Heltria, Septy; Prayogo, Luhur Moekti; Nugroho, Agung Tri; Rahmalia, Diah Ayu; Sari, Ratna Juita
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.1.10-15

The Karimata Strait possesses unique characteristics influenced by its geographical location and the local, regional, and global impacts on its physical, biological, and chemical parameters, contributing to its potential as a significant fishing ground. This study aims to observe and analyze the physical oceanographic parameters, including temperature, salinity, and sea surface currents, within the Karimata Strait. The dataset comprises monthly averaged data, resulting in a single representative value for each month. Key physical parameters examined include temperature, salinity, and the horizontal (u) and vertical (v) current components. The patterns of sea surface temperature (SST) and salinity distribution in the Karimata Strait exhibit significant variations between the west and east monsoons. During the west monsoon season, the South China Sea influenced the region with lower SST and higher salinity than the Java Sea. In contrast, the east monsoon demonstrates an inverse pattern with warmer, fresher waters from the Java Sea moving towards the strait. Additionally, the horizontal distribution of these parameters highlights the critical role of sea currents in dispersing physical oceanographic characteristics within the region. These findings underscore the dynamic nature of the Karimata Strait's oceanography, influenced by seasonal monsoon shifts, water masses from adjacent seas, and freshwater inputs from rivers, crucial for understanding the broader Indonesian Throughflow (ITF) system and its implications for regional climate and marine ecosystems.

Pengukuran Topografi Ketinggian: Studi Kasus Menggunakan Metode Real-Time Kinematic (RTK) GPS Geodetik R6 Prayogo, Luhur Moekti; Muhsoni, Firman Farid
Rekayasa Vol 17, No 3: Desember, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i3.27337

Large-scale topographic information is often difficult to obtain accurately. Technological advances in the field of surveying provide sophisticated instruments with varying degrees of accuracy. One of the widely used instruments is the Global Positioning System (GPS) Geodetic R6, which has an accuracy of up to 5-10 mm and the ability to capture L1 and L2 signals. This research aims to conduct altitude topography mapping using GPS Geodetic R6 in the coastal area of Kamal, Bangkalan Regency, Madura. The method used is Real-Time Kinematic (RTK) with a configuration of two base stations. The first base is located at Trunojoyo University Park Madura (coordinates: S 7°07'44.99587“, E 112°43'23.81230”, elevation: 6.81 meters), while the second base is located in front of Jalan Raya Telang Church (coordinates: S 7°07'46.65292“, E 112°42'46.91250”, elevation: 3.40 meters). The measurement results show that the average elevation in Telang Village, Kamal District, ranges from 3.29 to 7.89 meters with a Root Mean Square Error (RMSE) of 3.65. This research confirms that the R6 Geodetic GPS has high accuracy capabilities in topographic measurements, making it very reliable for precision mapping of coastal areas. This finding makes a significant contribution in supporting various development and mitigation needs in coastal areas.

Dinamika Distribusi Spasial-Vertikal Massa Air di Jalur Barat dan Timur Arlindo pada Musim Barat: Dynamics of the Spatial-Vertical Distribution of Water Masses in the West and East Indonesian Throughflow Routes in the Wet Season Yuliardi, Amir Yarkhasy; Prayogo, Luhur Moekti; Joesidawati, Marita Ika
MIYANG Vol 2 No 2 (2022): Jurnal Miyang Edisi November 2022
Publisher : Faculty of Fisheries and Marine, Universitas PGRI Ronggolawe, Tuban, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55719/jmiy.v2i2.532

Perairan timur Indonesia merupakan jalur Arus Lintas Indonesia (Arlindo) yang merupakan bagian dari sirkulasi massa air global. Arlindo memiliki dua jalur utama, jalur barat dan jalur timur yang berperan penting dalam mentransfer properti massa air dari Samudera Pasifik menuju Samudera Hindia. Indonesia yang memiliki batimetri kompleks menyebabkan terjadi dinamika pada jalur Arlindo. Untuk mengungkap dinamika massa air yang terjadi secara spasial dan vertikal pada jalur Arlindo, telah dilakukan kegiatan penelitian dengan memanfaatkan data reanalysis dengan paramater suhu dan salinitas. Data suhu dan salinitas ini didapatkan dari 9191 titik yang tersebar pada 115 – 140 BT dan 10 LU – 12.5 LS. Analisis dinamika distribusi spasial mencakup perairan timur Indonesia pada kedalaman 0 m, 250 m dan 500 m. Analisis dinamika distribusi vertikal kolom air pada jalur barat dan timur Arlindo yang diwakilkan masing-masing 4 stasiun pengamatan pada wilayah yang signifikan dilalui oleh Arlindo. Hasil analisis menunjukkan suhu dan salinitas terdistribusi dari perairan utara Papua masuk ke perairan Indonesia. Suhu yang hangat teridentifikasi sebagai kolam air hangat Pasifik barat. Distribusi vertikal massa air terstratifikasi kedalam tiga lapisan, lapisan tercampur, lapisan termoklin/haloklin dan lapisan dalam. Terjadi penurunan nilai salinitas pada stasiun-stasiun di Samudera Pasifik dengan ciri salinitas tinggi yang semakin tereduksi seiring memasuki perairan Indonesia. Teridentifikasi beberapa jenis massa air, South Pacific Subtropical Water (SPSW) dan North Pacific Subtropical Water (NPSW) pada lapisan termoklin dari Samudera Pasifik. Terdapat pula massa air asli pada laut banda, massa air laut jawa pada permukaan yang menawarkan lapisan permukaan dan jejak massa air dari Samudera Hindia.

Analisis Komponen Harmonik dan Elevasi Pasang Surut pada Alur Pelayaran Perairan Cilacap: Harmonic Component Analysis and Tidal Elevation in Shipping Lanes in Cilacap Waters Yuliardi, Amir Yarkhasy; Prayogo, Luhur Moekti; Spanton M, Perdana Ixbal
MIYANG Vol 3 No 1 (2023): Jurnal Miyang Edisi April 2023
Publisher : Faculty of Fisheries and Marine, Universitas PGRI Ronggolawe, Tuban, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55719/jmiy.v3i1.644

Cilacap merupakan kabupaten yang mempunyai luas area mencapai 225.360,840 ha yang terletak pada wilayah Jawa Tengah bagian selatan. Kabupaten ini menghadap langsung dengan Samudera Indonesia disebelah selatannya. Karakteristik elevasi harmonik suatu wilayah perairan bermanfaat untuk mengetahui interaksi pembentuk pasang surut pada wilayah tertentu. Hal ini dibutuhkan untuk keperluan pengelolaan lingkungan lebih lanjut serta bangunan pantai dan kegiatan lain di wilayah pesisir. Penelitian ini dilakukan menggunakan data primer berupa data elevasi pasang surut yang terekam setiap jam selama satu 31 hari pada bulan Januari 2019. Analisis harmonik menggunakan T-Tide untuk mengekstrak komponen-komponen pasang surut. Komponen pasut yang dominan diantaranya Q1, O1, NO1, K1, N2, M2. Perairan cilacap memiliki tipe pasang surut yang diklasifikasikan sebagai pasang surut campuran condong harian ganda dengan nilai indeks Formzahl sebesar 0.531856. Elevasi muka air laut di Perairan Cilacap MSL yang menunjukan nilai rata-rata muka air laut sebesar 3.46m, HAT 4.74m, MHWL 4.3m, MLWL 2.62m dan LAT 2.18m.

Investigation of the Tidal Character in Bawean Island East Java Using Admiralty Method Prayogo, Luhur Moekti; Hanif, Muhammad
Jurnal Perikanan dan Kelautan Vol. 27 No. 1 (2022): February
Publisher : Faculty of Fisheries and Marine, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jpk.27.1.1-5

Bawean Island is one of the islands in Gresik Regency, East Java, where almost all its territory is a coastal environment. This region's tidal oceanographic condition is critical because this area has a lot of potential for marine tourism and relatively shallow waters. This study aims to determine the tidal characteristics in the waters of Bawean Island, East Java, using the Admiralty method. This method was chosen because it can calculate the tidal component with only 15 days of data and can be used in various water conditions. The data used is tidal data from the Geospatial Information Agency (BIG) on November 1-15, 2020. From this research, it can be concluded that tidal analysis using the Admiralty method produces nine components, including M2, S2, N2, K1, O1, P1, M4, MS4, and K2. The four components determine the type of tide, namely O1, K1, M2, and S2, with amplitude values of 11.79347, 30.14857, 55.72241, and 63.69851. The calculation with the Formzahl number equation yields a value of 0.3512 (0.25 <F <1.5), which means that the tidal type in Bawean Island, East Java, has a mixed type with a semidiurnal tendency (double daily).

Tidal Characteristics in the Northern Coast of Central Java (a Case Study in Semarang, Indonesia) Prayogo, Luhur Moekti; Yuliardi, Amir Yarkhasy; Spanton, Perdana Ixbal

Publisher : Fishery Product Technology Study Program, Yudharta University, Pasuruan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35891/lempuk.v3i2.5643

Tides are a phenomenon that affects the dynamics of coastal waters. This study aims to analyze the characteristics of tides on the North Coast of Semarang, Central Java using the Least Square method. The tidal data used is in September 2020 from the Geospatial Information Agency open source data. The results showed that the tidal pattern in this area is dominated by a semi-diurnal component with a Formzahl number of 1.44, which means that the tidal type is mixed tending to be semi-diurnal. The main component identified is M2 (0.4 meters), which is the main semi-diurnal component influenced by the gravitational force of the moon. In addition, the S2 component (0.3 meters), which is a semi-diurnal component influenced by the gravitational force of the sun. In addition, the influence of extreme weather such as storms causes an increase in tide height, which triggers tidal flooding and coastal abrasion. The study concludes that an understanding of tidal characteristics is essential for sustainable coastal management. The results of this analysis can be used as a basis for mitigating environmental impacts, such as abrasion and tidal flooding, as well as for optimizing the economic activities of tide-dependent coastal communities, such as fisheries and ponds.

Analisis Variasi Musiman Suhu, Salinitas, dan Arus Permukaan di Perairan Madura Yuliardi, Amir Yarkhasy; Rachman, Herlambang Aulia; Sari, Ratna Juita; Rahmalia, Diah Ayu; Nugroho, Agung Tri; Prayogo, Luhur Moekti
Indonesian Journal of Oceanography Vol 6, No 4 (2024): Indonesian Journal of Oceanography
Publisher : University of Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijoce.v6i4.24477

Perairan sekitar Pulau Madura mencakup Laut Jawa di utara dan perairan selatan yang berbatasan dengan Pulau Jawa merupakan wilayah dengan dinamika oseanografis kompleks. Penelitian ini bertujuan untuk menganalisis variasi musiman Sea Surface Temperature (SST), Sea Surface Salinity (SSS), dan arus permukaan dan mengidentifikasi pengaruh monsun dan debit sungai terhadap kondisi oseanografis selama periode 2 tahun (2019-2020). Data debit sungai diperoleh dari Seasonal Reforecasts of River Discharge dari Global Flood Awareness System, sementara data parameter fisis laut diperoleh dari Global Ocean Physics Reanalysis. Hasil penelitian menunjukkan bahwa daerah pesisir yang berbatasan dengan Laut Jawa dan perairan di selatan Pulau Madura dipengaruhi secara signifikan oleh debit sungai dan siklus musiman monsun. Debit sungai yang tinggi selama musim hujan menyebabkan penurunan salinitas di perairan khususnya di selatan Madura. SST meningkat pada musim barat dan menurun pada musim timur. Perairan selatan Madura cenderung lebih stabil dengan pola arus yang dipengaruhi oleh kondisi geografis yang lebih tertutup. Pola arus di Laut Jawa berbalik arah setiap musim, sedangkan arus di selatan Madura cenderung konstan sepanjang tahun. Penelitian ini mengungkap perbedaan dinamika oseanografis antara perairan utara dan selatan Pulau Madura, serta pentingnya interaksi antara monsun dan debit sungai dalam membentuk kondisi lingkungan laut di wilayah ini.

Distribution of Sea Surface Temperature and Salinity in the Karimata Strait Yuliardi, Amir Yarkhasy; Firdaus, Randi; Heltria, Septy; Prayogo, Luhur Moekti; Nugroho, Agung Tri; Rahmalia, Diah Ayu; Sari, Ratna Juita
Journal of Coastal and Ocean Sciences Vol. 6 No. 1 (2025): January 2025
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.6.01.10-15

The Karimata Strait possesses unique characteristics influenced by its geographical location and the local, regional, and global impacts on its physical, biological, and chemical parameters, contributing to its potential as a significant fishing ground. This study aims to observe and analyze the physical oceanographic parameters, including temperature, salinity, and sea surface currents, within the Karimata Strait. The dataset comprises monthly averaged data, resulting in a single representative value for each month. Key physical parameters examined include temperature, salinity, and the horizontal (u) and vertical (v) current components. The patterns of sea surface temperature (SST) and salinity distribution in the Karimata Strait exhibit significant variations between the west and east monsoons. During the west monsoon season, the South China Sea influenced the region with lower SST and higher salinity than the Java Sea. In contrast, the east monsoon demonstrates an inverse pattern with warmer, fresher waters from the Java Sea moving towards the strait. Additionally, the horizontal distribution of these parameters highlights the critical role of sea currents in dispersing physical oceanographic characteristics within the region. These findings underscore the dynamic nature of the Karimata Strait's oceanography, influenced by seasonal monsoon shifts, water masses from adjacent seas, and freshwater inputs from rivers, crucial for understanding the broader Indonesian Throughflow (ITF) system and its implications for regional climate and marine ecosystems

Investigasi Karakter Pasang Surut di Pulau Bawean Jawa Timur menggunakan Metode Admiralty Prayogo, Luhur Moekti; Hanif, Muhammad
Jurnal Perikanan dan Kelautan Vol. 27 No. 1 (2022): February
Publisher : Fakultas Perikanan dan Kelautan Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/

Bawean Island is one of the islands in Gresik Regency, East Java, where almost all its territory is a coastal environment. This region's tidal oceanographic condition is critical because this area has a lot of potential for marine tourism and relatively shallow waters. This study aims to determine the tidal characteristics in the waters of Bawean Island, East Java, using the Admiralty method. This method was chosen because it can calculate the tidal component with only 15 days of data and can be used in various water conditions. The data used is tidal data from the Geospatial Information Agency (BIG) on November 1-15, 2020. From this research, it can be concluded that tidal analysis using the Admiralty method produces nine components, including M2, S2, N2, K1, O1, P1, M4, MS4, and K2. The four components determine the type of tide, namely O1, K1, M2, and S2, with amplitude values of 11.79347, 30.14857, 55.72241, and 63.69851. The calculation with the Formzahl number equation yields a value of 0.3512 (0.25 <F <1.5), which means that the tidal type in Bawean Island, East Java, has a mixed type with a semidiurnal tendency (double daily).

Peningkatan Potensi Sumberdaya Lokal Melalui Pelatihan Cipta Produk Desa dalam Pembuatan Garam Biru (Blue Salt) di Desa Pliwetan Kabupaten Tuban, Jawa Timur Perdana Ixbal Spanton; Prayogo, Luhur Moekti; Sudianto, Achmad; Jumiati
Jurnal ABDILAWE Vol 3 No 1 (2025): April 2025
Publisher : Lembaga Pengabdian Kepada Masyarakat Universitas PGRI Ronggolawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55719/as.v3i1.1693

Desa Pliwetan yang terletak di Kecamatan Palang, Kabupaten Tuban, memiliki luas wilayah sekitar ±3,4 ha dengan lima sektor utama: perikanan, ekonomi, peternakan, pertanian, dan perdagangan. Meskipun memiliki potensi pertanian yang baik, terutama dalam bidang pertambakan garam, sebagian besar penduduknya masih tergolong prasejahtera. Salah satu inovasi yang dikembangkan untuk meningkatkan kesejahteraan masyarakat adalah produksi garam biru (blue salt) melalui sistem tunel. Kelompok tani garam di desa ini berperan penting dalam mendorong masyarakat agar lebih inovatif dalam mengelola hasil tambak. Penelitian ini menunjukkan bahwa produksi garam biru tidak hanya mampu meningkatkan pendapatan petani garam, tetapi juga membuka peluang pasar yang lebih luas dengan adanya permintaan dari luar daerah seperti Cirebon, Yogyakarta, Ngawi, Bali, dan Magelang. Produk garam biru dijual dengan harga Rp8.000 per ¼ kg. Inovasi ini menjadi strategi potensial dalam meningkatkan nilai tambah komoditas lokal serta kesejahteraan ekonomi masyarakat pesisir.

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