Aulia Try Atmojo
Program Studi Teknik Geomatika, Institut Teknologi Sumatra, Lampung, Indonesia

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ANALISIS KARAKTERISTIK ARUS LAUT DAN TRANSPOR MASSA AIR DI PERAIRAN SEKITAR PULAU ENGGANO DENGAN MENGGUNAKAN MODEL NUMERIK 3D Iwan Pramesti Anwar; Mukti Dono Wilopo; Aulia Try Atmojo
JURNAL ENGGANO Vol. 6 No. 2 (2021)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31186/jenggano.6.2.%p

Abstract

GLORYS12V1 merupakan produk dari model numerik 3 dimensi fisika oseanografi dengan resolusi horizontal 1/12o x 1/12o (sekitar 8 km x 8 km) dan 50-layer terhadap kedalaman. Arus laut merupakan salah satu parameter dinamika oseanografi yang berhasil disimulasikan dengan baik oleh model tersebut. Arus laut terhadap kedalaman dapat digunakan untuk kajian tranpor volume. Dengan menggunakan GLORYS12V1 dapat dikaji arus permukaan dan transpor volume rata-rata bulanan di perairan sekitar Pulau Enggano dan sekitarnya selama tahun 2013. Kecepatan arus permukaan bervariasi antara 0-0,75 m/detik. Sementara itu, untuk arus terhadap kedalaman berkisar antara 0-1 m/detik dengan arah dan besar arus bervariasi terhadap kedalaman. Bahkan untuk bulan-bulan tertentu antara permukaan hingga kedalaman 50 m arah nya berbeda dengan kedalaman >50 m hingga dasar. Arus terhadap kedalaman di barat laut dengan tenggara Pulau Enggano memiliki perbedaan arah pada bulan-bulan musim peralihan seperti April dan November. Sementara untuk besarnya relatif sama yaitu pada kisaran 0-1 m/detik. Kemudian transpor volume terhadap kedalaman yang melalui perairan antara Pulau Enggano dengan daratan Sumatra berkisar antara -2 Sv sampai 2 Sv, (1 Sv=106 m3/detik). Nilai positif (negatif) menunjukan arah transport ke barat laut (tenggara). Transpor maksimum berada pada kedalaman 100-700 m pada bulan April-Mei dan Oktober-November menuju barat laut sedangkan bulan Februari-Maret dan Juni-Juli menuju tenggara. Perbedaan arah transpor terhadap kedalaman terjadi pada bulan Februari-Maret (musim barat) dan Juni-Juli (musim timur). Sedangkan pada musim peralihan I dan peralihan II transpor terhadap kedalaman arahnya cenderung seragam yaitu menuju tenggara. Korelasi antara transpor volume dengan kecepatan angin lokal menunjukan kuat searah dari permukaan hingga kedalaman 20 m. Selanjutnya, dari kedalaman 20-300 m korelasi tranpor volume dengan angin berlawanan. Terakhir, dari kedalaman 300 m hingga dasar korelasinya searah namun tidak signifikan. Hal tersebut mengindikasikan bahwa kecepatan arus dan transpor volume di Perairan Pulau Enggano dan sekitarnya dipengaruhi oleh kecepatan angin lokal untuk permukaan - 20 m dan pengaruh regional untuk kedalaman > 20 m. KATA KUNCI: Perairan Pulau Enggano, Arus Laut, Transpor VolumeABSTRACTGLORYS12V1 is a product of a 3-dimensional numerical model of oceanographic physics with a horizontal resolution of 1/12o x 1/12o (approximately 8 km x 8 km) and 50 layers to depth. Ocean currents are one of the parameters of oceanographic dynamics which the model has successfully simulated. Ocean currents to depth can be used for volume transport studies. Thus, by using GLORYS12V1, it is possible to study the average monthly surface currents and transport volumes in the waters around Enggano Island and its surroundings during 2013. The surface current velocity varies between 0-0.75 m/s. Meanwhile, current with depth ranged from 0-1 m/s with the direction and magnitude of the currents vary with depth. Even for certain months, the direction is different between the surface to a depth of 50 m, with a depth of > 50 m to the bottom. Currents to deep in the northwest and southeast of Enggano Island have different directions in the transitional season months, such as April and November. Meanwhile, the magnitude is relatively the same, namely in the range of 0-1 m/s. Then the transport volume to depth through the waters between Enggano Island and mainland Sumatra ranges from -2 Sv to 2 Sv, (1 Sv=106 m3/s). A positive (negative) value indicates the direction of transport to the northwest (southeast). Maximum transport is at a depth of 100-700 m in April-May and October-November towards the northwest while February-March and June-July towards the southeast. The difference in transport direction with depth occurs in February-March (west season) and June-July (eastern season). Meanwhile, in transition seasons I and II, the direction of transport towards depth tends to be uniform, namely towards the southeast. The correlation between volume transport and local wind speed shows the unidirectional strength from the surface to a depth of 20 m. Furthermore, from a depth of 20 m-300 m, the volume transport correlates with the opposite wind. Finally, from a depth of 300 m to the base, the correlation is unidirectional but not significant. This indicates that current velocity and volume transport in the waters of Enggano Island and its surroundings are influenced by local wind speeds for surface – 20 m and regional influences for depths > 20. KEYWORDS : Enggano Island’s waters, Sea current, Volume transport
Modeling of tsunami run-up using terrain model data based on photogrammetry processing product (case study at Way Muli Village, Rajabasa, South Lampung) Muhammad Ulin Nuha; Naufal Hilmi; Adhitya Erlangga Pamungkas; Chantika Dwi Novita; Adam Irwansyah Fauzi; Aulia Try Atmojo; Rizky Ahmad Yudanegara
Elipsoida : Jurnal Geodesi dan Geomatika Vol 4, No 01 (2021): Volume 04 Issue 01 Year 2021
Publisher : Department of Geodesy Engineering, Faculty of Engineering, Diponegoro University,Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/elipsoida.2021.11493

Abstract

Photogrammetry has become a trend in large-scale mapping today. The ability to produce large-scale geospatial products in a relatively short time and low cost is very beneficial for mapping. The ability of high temporal and spatial resolution also makes photogrammetry used in the disaster mapping process. In this study, the DEM approach from photogrammetry was used for input data in tsunami run-up modeling activities in Way Muli Village. High temporal and spatial capabilities are utilized for the production of surface roughness and elevation which are key parameters for rigorous inundation modeling. The modeled inundation results show that the run-up limit achieved in residential areas is on the main road with a maximum distance of inundation from the shoreline is an average of 80 m. The results obtained can be used by the village government to preparedness in dealing with the tsunami.
ANALISIS ZONA POTENSI PENANGKAPAN IKAN BERDASARKAN SPL, KLOROFIL-A, DAN BOAT DETECTION SERTA MENGKAJI RZWP3K, LAMPUNG Jodi Hans Sitorus; Aulia Try Atmojo; Samsul Bachri; Hardian Sy. Prayitno; Imam Komarita
Jurnal Teknologi Perikanan dan Kelautan Vol 13 No 1 (2022): MEI 2022
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3538.639 KB) | DOI: 10.24319/jtpk.13.89-102

Abstract

In 2021, the Marine Affairs and Fisheries Office of Lampung Province only recorded fish volume and production data at the technical executive unit in Kota Agung. This will make a difficulty for fishermen outside the technical executive unit of Kota Agung to determine fishing locations and for researchers to determine the potential of all water areas. The study aimed to obtain the distribution value of Sea surface temperature (SST) and Chlorophyll-a, the results of potential fishing zones, and to analyze regulations related to fishing throughout Lampung waters. Determination of potential pelagic fish locations based on SST, Chlorophyll-a, and boat detection parameters. The data was obtained by utilizing AQUA-MODIS and SNPP-VIIRS Level 3 satellite imagery. The methods used are Inverse Distance Weighting (IDW) Interpolation and Kernel Density Estimation (KDE). In March-April 2022, areas of high potential for pelagic fish with SST 27-28°C and chlorophyll-a 1.1-1.9 mg/m³ are in the waters of Tanggamus Regency, South Lampung, East Lampung, and Bandar Lampung City. Whereas in the waters of West Lampung Regency, it has a low potential with SST 29-30°C and chlorophyll-a 2.2-3.1 mg/m³. The interviews with fishermen and the Marine Affairs and Fisheries Office of Lampung Province revealed that there were still violations of the application of RZWP3K in the Allowed Catches (JTB) by fishermen, with catches exceeding the allowed catches (5-10 tons per day). Therefore, the application of fishing permits (SIPI) for small fishermen 5-15 GT and fishing business permits (SIUP) need to be reaffirmed, especially in potential areas.