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STUDY OF SHORELINE CHANGES AT JENEBERANG RIVER DELTA, MAKASSAR Sakka, Sakka; Purba, Mulia; Nurjaya, I Wayan; Pawitan, Hidayat; Siregar, Vincentius P.
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 3 No. 2 (2011): Elektronik 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 | Full PDF (568.813 KB) | DOI: 10.29244/jitkt.v3i2.7826

Abstract

The study of shoreline changes during 1990 - 2008 in the delta of the River Jeneberang, Makassar was conducted by evaluating sediment transport into and out of a cell. Longshore sediment transport was computed by considering the influence of heights and angles of the breaking waves. Results of calculation of sediment transport showed that the dominant of sediment transport was to the north during the arrival of the southwest and west waves, and to the south when the wave coming from the northwest. Comparison between shore profiles resulting from model and coastline satellite imagery showed similarity. The difference between the two tend to be occurred at the head land part of the shoreline. This was due to complexity of coastal dynamic at the area. The results of the 19 years shoreline simulation showed that there was a tendency of abrasion at the upsteam head land part as the wave energy tend to converge and accretion at the bay part as the wave energy tend to diverge. Abrasion mainly occurred at Tanjung Bunga (head land) where the coast retreat 181.1 m. Accretion occur in the bay area (Tanjung Merdeka) where the coast advance to the sea for about 59.8 m. The shoreline tend to be stable when the profile was straight such as Barombong Coast.Keywords: abrasion, accretion, sediment transport, shoreline changes.
ALGORITMA UNTUK DETEKSI TUMPAHAN MINYAK DI LAUT TIMOR MENGGUNAKAN CITRA MODIS Sudibjo, Muhammad; Siregar, Vincentius P.; Gaol, Jonson Lumban
Jurnal Teknologi Perikanan dan Kelautan Vol 4 No 1 (2013): MEI 2013
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1148.41 KB) | DOI: 10.24319/jtpk.4.41-62

Abstract

Tumpahan minyak di Laut Timor yang terjadi pada tahun 2009 telah menyebarkan minyak seluas 10.842.81 km2. Tumpahan minyak ini berhasil dideteksi oleh satelit Moderate Resolution Imaging Spectroradiometer (MODIS). Tujuan dari penelitian ini adalah membandingkan hasil deteksi tumpahan minyak dari beberapa algoritma dengan citra menggunakan citra MODIS dan melihat perbedaan visual yang dihasilkan. Algoritma yang digunakan adalah Oil Spill Index, Fluorescence Index, Principal Component Analysis (PCA), Normalized Difference Vegetation Index (NDVI). Visualisasi tumpahan minyak yang terlihat pada citra MODIS dengan algoritma oil spill indeks dan fluorescence index lebih cerah dibandingkan dengan badan air disekitarnya dan juga memiliki nilai piksel lebih tinggi, sedangkan visualisasi minyak menggunakan algoritma PCA dan NDVI lebih gelap dibandingkan dengan badan air disekitarnya dan juga memiliki nilai piksel yang lebih rendah. Hasil uji akurasi yang dilakukan terhadap algoritma oil splill index, fluorescence index, PCA, NDVI berturut-turut sebagai berikut 41%, 46%, 41%, dan 60%
EVALUASI KESESUAIAN LAHAN TAMBAK UDANG DI KECAMATAN CIJULANG DAN PARIGI, CIAMIS, JAWA BARAT Syaugy, Afwan; Siregar, Vincentius P.; Arhatin, Risti Endriani
Jurnal Teknologi Perikanan dan Kelautan Vol 3 No 2 (2012): NOVEMBER 2012
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1039.76 KB) | DOI: 10.24319/jtpk.3.43-56

Abstract

Selection of wrong location fishponds will cause the problems, such as increasing the cost of construction, operational, and may cause environmental degradation. The purpose of this study was to evaluate the land suitability for shrimp farms considering the coastal and river border planning maps in Kecamatan Cijulang and Parigi. This study uses the Geographic Information Systems (GIS) to determine the level of compliance of existing shrimp farms in the area. The parameters taken into calculated are: land use; soil texture; soil type; land slope; distance from the river; distance from the shore; water pH, and salinity. The result of the spatial analysis was added by limiting factor coastal and river border, so the extensive shrimp farms area is 23.8 ha divided into three classes of suitability, namely very accordance (11.7 ha or 49.0%); accordance (1.0 ha or 4.3%), and not in accordance (11.1 ha or 46.6%). There are no shrimp farms in the area of conditional suitability. The existing farm in this region is almost entirely located in the area that should be a river border. In order to keep a sustainable shrimp farms management, it is needed a good cooperation between the management of the shrimp farms and the government.
HUBUNGAN KONSENTRASI KLOROFIL-A DAN SUHU PERMUKAAN LAUT DENGAN HASIL TANGKAPAN IKAN PELAGIS UTAMA DI PERAIRAN LAUT JAWA DARI CITRA SATELIT MODIS Putra, Ega; Gaol, Jonson Lumban; Siregar, Vincentius P.
Jurnal Teknologi Perikanan dan Kelautan Vol 3 No 2 (2012): NOVEMBER 2012
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1173.748 KB) | DOI: 10.24319/jtpk.3.1-10

Abstract

This research aims to study spatial and temporal variation of chlorophyll-a concentration and sea surface temperature as well as his relationship with pelagic fish catches in Java Sea. The results showed in 2006th-2010th sea surface temperaturerice occurs by 1°C which monthly average range between 27,9°C ? 31,4°C. Sea surface temperature are relatively higher in transitional seasons compared to west season and east season. Chlorophyll-a concentration in area of research ranging from 0,22 mg/m³- 1,15 mg/m³. Chlorophyll-a concentration value each month fluctuates follow wind of progress. Maximum value of chlorophyll-a concentration happening in wesh season and minimum value occurs in transitional season 2. Layang scad, banyar fish and eastern little tuna has a negative response to sea surface temperature especially in east season. As for sardine fish and fringescalle sardine show absence of a direct relationshop between sea surface temperature with CPUE value catches. Sardine fish and fringescalle sardine show any positive response to rising chlorophyll-a concentration, while for layang scad, banyar fish and eastern little tuna an increase value of chlorophyll-a concentration does not have a direct impact on rising CPUE value of third type of this fish.
PROFIL BATIMETRI HABITAT PEMIJAHAN IKAN TERUMBU HASIL INTEGRASI DATA INDERAJA SATELIT DAN AKUSTIK: STUDI KASUS PERAIRAN SEKITAR PULAU PANGGANG, KEPULAUAN SERIBU Agus, Syamsul B.; Siregar, Vincentius P.; Bengen, Dietrich G.; Hanggono, Aryo
Jurnal Teknologi Perikanan dan Kelautan Vol 3 No 1 (2012): MEI 2012
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1975.297 KB) | DOI: 10.24319/jtpk.3.45-61

Abstract

Remote sensing technology, both optic and acoustic, serves as major tool for mapping bathymetry synoptically and efficiently. In complex coral cays as Kepulauan Seribu, bathymetric profile may change gradually due to naturally controlled reef accretion/erotion, sand/coral exploitation activities, storms, and mostly several types of fishing techniques (muroami and blast fishing). In this paper, elaboration on bathymetric profiles originated from coupled optic-acoustic dataset will be applied in account for understanding reef fish spawning habitats. A total of 17 reef sites were surveyed in situ to record reef fish with spawning cues (eg: female gravid, male change color, aggregation, etc) in between October 2010-March 2012. A 2008 Quickbird imagery and single beam acoustic data were gridded at 1 m by interpolation using Inverse Distance to Power method resulted in 2-dimension and 3-dimension bathymetric maps thus revealing complex detail of seabed at shallow and deeper depths. Terrain profiles depicting lateral view of bathymetric profile for each reef site were used to describe geomorpological features supporting its role as spawning habitat.
KLASIFIKASI HABITAT BENTIK BERBASIS OBJEK DENGAN ALGORITMA SUPPORT VECTOR MACHINES DAN DECISION TREE MENGGUNAKAN CITRA MULTISPEKTRAL SPOT-7 DI PULAU HARAPAN DAN PULAU KELAPA Prabowo, Nico Wantona; Siregar, Vincentius P.; Agus, Syamsul Bahri
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 10 No. 1 (2018): 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 | Full PDF (1030.367 KB) | DOI: 10.29244/jitkt.v10i1.21670

Abstract

Teknik klasifikasi berbasis objek dengan algoritma machine learning SVM untuk citra resolusi tinggi di Indonesia sampai saat ini masih terbatas khususnya untuk pemetaan terumbu karang, oleh karena itu diperlukan kajian lebih lanjut mengenai perbandingan metode maupun penerapan algoritma sebagai alternatif dari proses klasifikasi. Penelitian ini bertujuan memetakan habitat bentik berdasarkan klasifikasi menggunakan metode OBIA dengan algoritma support vector machine dan decision tree di Pulau Harapan dan Kelapa. Segmentasi dilakukan menggunakan algoritma multiresolution segmentation dengan faktor skala 15. Metode OBIA diterapkan pada citra terkoreksi atmosfer dengan skema klasifikasi habitat bentik yang telah ditentukan sebelumnya. Akurasi keseluruhan dari penerapan algoritma SVM dan DT masing-masing sebesar 75,11% dan 60,34%. Analisis nilai Z statistik yang diperoleh dari penerapan dua algoritma yang digunakan yakni sebesar 2,23, dimana nilai ini menunjukkan bahwa klasifikasi dengan algoritma SVM berbeda nyata dengan hasil dari penggunaan algoritma DT.  
PEMETAAN ZONA GEOMORFOLOGI EKOSISTEM TERUMBU KARANG MENGGUNAKAN METODE OBIA, STUDI KASUS DI PULAU PARI (GEOMORPHIC ZONES MAPPING OF CORAL REEF ECOSYSTEM WITH OBIA METHOD, CASE STUDY IN PARI ISLAND) Anggoro, Ari; Siregar, Vincentius P.; Agus, Syamsul B.
Jurnal Penginderaan Jauh dan Pengolahan Data Citra Digital Vol. 12 No. 1 Juni 2015
Publisher : Indonesian National Institute of Aeronautics and Space (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini menggunakan penerapan klasifikasi berbasis obyek (OBIA) untuk pemetaan zona geomorfologi ekosistem terumbu karang di Pulau Pari. Penerapan metode OBIA menggunakan algoritma multiresolusi segmentasi dengan parameter skala yang berbeda pada setiap level. Metode klasifikasi yang digunakan untuk level 1 dan 2 dengan klasifikasi kontekstual. Hasil menunjukkan akurasi keseluruhan untuk level 1 (level terumbu) sebesar 97% dan level 2 sebesar 87% (zona geomorfologi). Hasil penelitian ini menunjukkan bahwa metode OBIA mampu memetakan dengan baik dan dapat menjadi metode alternatif pada pemetaan zona geomorfologi ekosistem terumbu karang untuk di wilayah lainnya.Kata Kunci: Segmentasi, OBIA, Zona geomorfologi, Pulau Pari
KLASIFIKASI MANGROVE BERBASIS OBJEK DAN PIKSEL MENGGUNAKAN CITRA SENTINEL-2B DI SUNGAI LIONG, BENGKALIS, PROVINSI RIAU Rosmasita, .; Siregar, Vincentius P.; Agus, Syamsul B.
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 10 No. 3 (2018): 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 | Full PDF (1885.166 KB) | DOI: 10.29244/jitkt.v10i3.22182

Abstract

ABSTRAK Penelitian pemetaan mangrove di Sungai Liong, Bengkalis Provinsi Riau sangat terbatas, sehingga ketersediaan data spasial di wilayah ini masih sangat terbatas. Pemanfaatan citra satelit dapat dijadikan alternatif dalam menyediakan data spasial secara efektif dan efesien. Penelitian ini bertujuan untuk memetakan mangrove sampai tingkat komunitas menggunakan citra sentinel 2B dengan metode klasifikasi berbasis objek/OBIA dan membandingkannya dengan teknik klasifikasi berbasis piksel. Algoritma yang digunakan pada penelitian ini adalah support vector machine (SVM). Pengembangan skema klasifikasi mangrove pada penelitian ini di bagi menjadi 2 level, yaitu kelas penutup lahan di sekitar mangrove dan kelas komunitas mangrove. Data yang digunakan untuk klasifikasi kelas penutup lahan adalah data foto udara yang diperoleh dengan menggunakan pesawat tanpa awak (unmanned aerial vehicle/UAV) dan untuk klasifikasi komunitas menggunakan data transek tahun 2013. Akurasi keseluruhan  (OA) yang diperoleh untuk klafikasi penutup lahan mangrove dengan kedua teknik klasifikasi berbasis objek dan piksel berturut-turut adalah 78,7% dan 70,9%. Sedangkan akurasi keseluruhan (OA) untuk klasifikasi komunitas mangrove berbasis objek dan piksel berutru-turut yaitu 76,6% dan 75,0%. Sekitar 7,8% peningkatan akurasi pemetaan penutup lahan dan sekitar 1,6% peningkatan akurasi pemetaan komunitas mangrove yang diperoleh dengan metode klasifikasi berbasis objek. ABSTRACTResearch on mangrove mapping at the Liong River Bengkalis Riau Province was very limited, therefore the spatial data availability of mangrove in Liong River is also very limited. The use of satellite remote sensing to map mangrove has become widespread as it can provide accurate, effecient, and repeatable assessments. The purposed of this study was to map mangrove at the community level using sentinel 2B imagery based on object-based classification method (OBIA) and it compared pixel-based classification at Liong River, Bengkalis, Riau Provinc. This study was used support vector machine (SVM) algorithm. The scheme classification use is that land cover and mangrove community. The classification data of land cover was collected using unmanned aerial vehicle (UAV) and community mangrove was using transect data of 2013. The result of land cover classification and community mangrove indicated that object-based classification technique was better than pixel-based classification. The highest an overall accuracy of land cover is 78.7% versus 70.9%, whereas mangrove community is 76.6 versus 75.0%. Approximately 7.8% increase in accuracy can be achieved by object-based method of classification for land cover and 1.6% for mangrove community.
GEOMORPHOLOGY ZONATION AND COLUMN CORRECTION FOR BOTTOM SUBSTRAT MAPPING USING QUICKBIRD IMAGE Selamat, Muhammad Banda; Jaya, Indra; Siregar, Vincentius P.; Hestirianoto, Totok
Jurnal Teknologi Perikanan dan Kelautan Vol 3 No 1 (2012): MEI 2012
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (703.758 KB) | DOI: 10.24319/jtpk.3.17-25

Abstract

Salah satu kelemahan metode koreksi kolom air adalah dapat memunculkan bias dalam estimasi rasio koefisien atenuasi.  Bias ini berkontribusi pada nilai akurasi tematik peta substrat dasar. Studi ini menggunakan pendekatan zonasi geomorfologi untuk meningkatkan akurasi tematik peta substrat yang dihasilkan dari metode koreksi kolom air.  Nilai piksel citra Quickbird dikonversi ke radiansi dan dilanjutkan dengan koreksi kolom air untuk menghasilkan peta substrat dasar dengan tiga tema: substrat dominan pasir, lamun dan karang.  Data lapangan dikelompokkan menggunakan metode Bray curtis dan menjadi dasar bagi reklasifikasi.  Profil geomorfologi dicitra disadap dari gabungan kanal hijau dan merah, mengacu pada hasil survei batimetri.  Akurasi tematik metode kombinasi ini dapat mencapai lebih dari 80%.
POTENTIAL FISHING GROUND MAPPING BASED ON GIS HOTSPOT MODEL AND TIME SERIES ANALYSIS: A CASE STUDY ON LIFT NET FISHERIES IN SERIBU ISLAND Rivai, Andi Alamsyah; Siregar, Vincentius P.; Agus, Syamsul B.; Yasuma, Hiroki
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (419.159 KB) | DOI: 10.29244/jitkt.v9i1.17948

Abstract

Information on the spatial and temporal of fishing activity can optimize a fisheries management and increase their economical and biological benefit. For effective management and good understanding of fishing activities, information about fishing ground is crucial. In this study, we aimed to analyze the spatio-temporal of lift net fisheries in Kepulauan Seribu by analyzing their fishing season, investigating their hotspot of fishing ground using GIS-based hotspot model, and mapping the potential fishing ground of each target species. We found that anchovy and scad could be caught throughtout the year, while sardine and squid had high fishing season in west monsoon. Hotspot of fishing ground of lift net fisheries in Kepulauan Seribu waters generally was concentrated around Lancang Island and in southern part of Kotok Island. Potential fishing ground for sardines was located in around Lancang Island on west monsoon. Squids were highly distributed around Lancang Island in December to January and around Lancang and Rambut Islands in November. Anchovy and scad had more potential fishing ground in around Kepulauan Seribu waters.  Keywords: fishing ground, lift net, hotspot, fishing season