Edi Kusmanto
Center for Research and Development of Oceanology, Indonesian Institute of Science (P2O-LIPI), Jakarta, Indonesia

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Suhu dan Salinitas Permukaan Merupakan Indikator Upwelling Sebagai Respon Terhadap Angin Muson Tenggara di Perairan Bagian Utara Laut Sawu (Surface Temperature and Salinity are Indicators of Upwelling In Response to Southeast Moonson in the Savu Sea) Tubalawony, Simon; Kusmanto, Edi; Muhadjirin, Muhadjirin
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 17, No 4 (2012): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

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Abstract

Laut Sawu merupakan bagian perairan Indonesia yang secara langsung berbatasan dengan Samudera Hindia. Di bagian utara, terutama perairan selatan Selat Flores, Selat Lamakera dan Selat Alor merupakan perairan dinamik dengan perubahan suhu dan salinitas permukaan yang signifikan pada musim angin muson tenggara. Dinamika perairan tersebut terutama di lapisan permukaan sangat dipengaruhi pola tiupan angin muson. Pada bulan Juni-Juli angin muson tenggara bertiup dengan kekuatan maksimum di sebagian wilayah Indonesia termasuk di bagian utara Laut Sawu. Tiupan angin tersebut menyebabkan pergerakan massa air permukaan cenderung bergerak ke arah barat. Keadaan tersebut menyebabkan terjadinya pengangkatan massa air lapisan dalam ke permukaan di bagian utara Laut Sawu. Suhu permukaan laut di laut Flores berkisar antara 27,45-27,79 oC dengan rerata 27,62?0,14 oC, sedangkan pada stasiun pengamatan di bagian selatan dan berhubungan langsung dengan Laut Sawu, suhu perairan berkisar 25,25-26,75 oC dengan rerata 25,90?0,43oC. Secara umum sebaran suhu pada lapisan permukaan laut pada kedalaman 0-5 m menunjukkan semakin ke selatan massa air permukaan laut semakin dingin. Pusat konsentrasi massa air dengan suhu terendah di selatan Selat Alor berkisar antara 25,25-25,89oC. Dinginnya massa air perairan bagian utara Laut Sawu mengindikasikan kemungkinan terjadi pengangkatan massa air dalam ke permukaan pada perairan tersebut.Kata kunci: Laut Sawu, upwelling, salinitas, suhu permukaan laut, termoklinSavu Sea waters are part of Indonesia waters which is located directly adjacent to Indian Ocean. The northern part of Savu Sea particularly in the south of Flores Strait, Lamakera Strait and the Strait of Alor waters are dynamic with changes in temperature and salinity of the surface which is significant at southeast monsoon season. The dynamics of these waters, especially in the surface layer is strongly influenced by the monsoon wind patterns. In June-July, the monsoon winds blowing from southeast with maximum strength in parts of Indonesia, including in the waters of the northern Sea Savu. The wind causes the movement of surface water masses tend to move westward. These circumstances would to bring deeper and colder waters to the surface layer in the northern part of Savu Sea. Sea surface temperature in the Flores Sea ranged from 27.45 to 27.79?C with a mean 27.62 ? 0.14?C, whereas the observation stations located in the south and deal directly with the Savu Sea, water temperatures in the range 25.25 to 26.75?C with a mean 25.90 ? 0.43?C. In general, the temperature distribution on the surface layer of the ocean at a depth of 0-5 m to the south indicates that the mass of sea water gets colder. Central mass concentration of water with the lowest temperature in the southern Strait of Alor range from 25.25 to 25.89?C. The cold waters of the northern part of the Savu Sea water mass indicates the possibility upwelling of water mass in the Savu waters.Key words: Savu sea, upwelling, salinity, sea surface temperature, thermocline
Arus Rip di Perairan Pesisir Pangandaran, Jawa Barat (Rip Current in Pangandaran Coastal Water, West Java) Kusmanto, Edi; Setyawan, Wahyu Budi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 18, No 2 (2013): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

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Abstract

Perairan pesisir Pangandaran adalah bagian dari perairan pesisir Teluk Parigi dan merupakan bagian yang paling tenang. Keadaan tersebut menyebabkan pantai Pangandaran berkembang menjadi tempat tujuan wisata pantai yang terkenal. Penelitian dilakukan di bagian pantai dimana arus rip diketahui sering terjadi. Gambaran tentang arus rip dilakukan dengan pengamatan visual dan pendekatan analisis kondisi morfologi pantai, batimetri atau morfologi dasar laut, kondisi gelombang, kecepatan dan arah arus, serta kekeruhan. Hasil penelitian ini menunjukkan bahwa arus rip merupakan kejadian yang umum di kawasan pesisir Teluk Parigi, dan sering muncul di bagian tertentu pantai Pangandaran yang telah dipandang aman. Swell dengan kisaran periode 6,57? 8,91 dt dari Samudera Hindia dengan arah hampir tegak lurus garis pantai diduga merupakan gelombang pencetusnya. Hasil penelitian menunjukkan enam arus rip dengan kecepatan berkisar dari 0,8?1 m.dt-1. Rekaman data kekeruhan membuktikan arus rip tersebut membawa muatan sedimen dari tepi pantai ke tengah laut. Data batimetri di lokasi penelitian memperlihatkan adanya morfologi dasar laut yang bergelombang membentuk punggungan dan lembah memanjang dari pantai ke arah laut lepas. Posisi kejadian arus rip yang tidak spesifik di lembah atau punggungan menunjukkan tidak adanya kontrol morfologi dasar laut terhadap kejadian arus rip. Kata kunci: arus rip, swell, pantai pasir, perairan pesisir, Pangandaran Pangandaran coastal waters is coastal tourism site that situated at the calmest part of Parigi Bay coastal waters. The favorable coastal area condition has made the coastal zone growth to be favorite coastal tourism site. The study site was coastal segment where rip currents frequently occur. This research was conducted by visual observation of rip currents and coastal morphology analysis approach, bathymetry survey, wave conditions, the speed and direction of currents, and turbidity. Results of this study indicate that rip currents are common phenomena at the Parigi Bay coastal area, and the currents frequently occur at several parts of the Pangandaran coastal zone, which are supposed to be safe. The rip currents could be identified visually. Swell with periods of 6.57 to 8.91 s propagating from the Indian Ocean in nearly normal direction to the coastline of Pangandaran could be the cause of rip currents. During field work of this study, it was recorded the existing of six rip currents with speeds in the range of 0,8?1 m.s-1. Obtained backscatterance records indicated that the recorded rip currents transport sediment load seaward from swash zone. Bathymetry data records of the study area showed an existing of undulating submarine morphology with axis lines normal to coastline. However, position of the rip current occurrence had no a good correlation with the undulating morphology. The facts indicate that no control of seabed morphology on rip current occurrence. ? Keywords: rip current, swell, sandy beach, coastal waters, Pangandaran
OBSERVATION OF COASTAL FRONT AND CIRCULATION IN THE NORTHEASTERN JAVA SEA, INDONESIA Atmadipoera, Agus S.; Kusmanto, Edi; Purwandana, Adi; Nurjaya, I Wayan
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 7, No 1 (2015): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Jurnal Ilmu dan Teknologi Kelautan Tropis

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Abstract

The structure and spatial extent of a coastal front and circulation in the shallow (<55 m depth) northeastern Java Sea in Indonesia was investigated with a new dataset of high-resolution conductivity-temperature-depth (CTD) and along-track shipboard acoustic Doppler current profiler (SADCP) during a DIKTI-LIPI 2010 joint research cruise on R.V. Baruna Jaya 8.  The coastal front separates fresh warm coastal water derived mainly from Barito River discharge and the saline, cool Java Sea water.  The surface fresh water plume extends approximately 760 km from the Barito River estuary to the south, and its thickness varies from the surface to 10 m and 20 m depth, depending on its proximity to the fresh water source.  The front is aligned a northeast and east direction, probably related to a meandering of strong northeastward monsoon current in the eastern part of the Java Sea during the observation time. Keywords: hydrographic measurement, coastal front, Matasiri Islands, Barito River, the northwest monsoon current