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All Journal Jurnal Teknologi Perikanan dan Kelautan Jurnal Ilmu dan Teknologi Kelautan Tropis Journal of Marine and Aquatic Sciences ILMU KELAUTAN: Indonesian Journal of Marine Sciences Journal of Applied Geospatial Information International Journal of Remote Sensing and Earth Sciences (IJReSES) Asian Journal of Aquatic Sciences

Yuli Naulita

Departemen Ilmu Dan Teknologi Kelautan, FPIK, IPB University, Bogor

Author-ID : 329128

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Environmental Science Library & Information Science Physics

Published : 12 Documents Claim Missing Document

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Articles

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WAVELET DENOISING APPLICATION ON CTD (CONDUCTIVITY TEMPERATURE DEPTH) SIGNALS TO IMPROVE THE QUALITY OF IDENTIFIED OVERTURN REGION Yuli Naulita
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 6 No. 1 (2014): Electronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Turbulent mixing process can be evaluated from density inversions in CTD profiles, that may reveal the overturning eddies. The quality of overturn regions are then determined by the quality of CTD signals. The study removed noise on CTD signals without losing small perturbation which commonly occurred by traditional filter. By applying wavelet denoising in pre-processing data of Thorpe method, more Thorpe displacements indicated overturn regions, were able to detect especially in small density gradients. Therefore, the identified overturn region using the Thorpe method can be applied to a larger region of density gradients. Keywoods: turbulent mixing, overturn, Thorpe method, Thorpe displacement, wavelet denoising.

TOPOGRAPHICALLY INDUCED TURBULENCE ON CONTINENTAL SHELF OFF JOGASHIMA, SAGAMI BAY, JAPAN Yuli Naulita
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 6 No. 2 (2014): Electronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

ABSTRACT Direct turbulence measurements using TurboMAP over a “small ridge” on the continental shelf off Jogashima, Sagami Bay, Japan revealed an active layer of topographically induced turbulence. The active layer ( = 10-7 - 10-6 W kg-1) located at mid-depth of 200 – 250 m, occurred on alternate side of “small ridge” depending on the direction of the tidal current. This active layer was accompanied by rebounded-isopycnal surfaces 26.0 - 26.1 σθ , in which all in qualitative manner showed an internal hydraulic flow control on the shelf. The turbulence friction velocity was two order of magnitude lower than observed- in this active layer explaining a less role of bottom friction than hydraulic flow to the high turbulence layer. Keywords: topographically induced turbulence, continental shelf, internal hydraulic flow

TURBULENT MIXING PROCESSES IN LABANI CHANNEL, THE MAKASSAR STRAIT Yuli Naulita
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 8 No. 1 (2016): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Study on turbulent mixing processes in Labani Channel, the Makassar Strait, was conducted by using the INSTANT (International Nusantara Stratification And Transport) program dataset, in Juli 2005. The turbulent mixing process was evaluated using Thorpe method, where the overturning eddies were revealed by density inversions in CTD (Conductivity Temperature Depth) profiles. All individual identified-overturn regions was validated by the GK’s test (Galbraith and Kelly test) where at first noise on CTD signals had been removed by applying wavelet denoising. A large number of overturn regions with Thorpe scale (LT) less than 0.5 m were detected in the thermocline layer of Makassar Strait. Based on linear relationship between Thorpe and Ozmidov scale, order of magnitude of the turbulent energy kinetic dissipation rate in Labani Channel was estimated about 10-11- 10-5Wkg-1 and density eddy diffusivity Kρ(10-6 – 10-2) m2/s . The strong of turbulen mixing was found at the layer of NPSW at 150 m depth and NPIW at 300 m depth, indicated by high values of Kρ (O = 10-3 – 10-2 m2s-1). It reveals that turbulent mixing has an important role on determining ITF water mass character. Keywoods: turbulent mixing, wavelet denoising, overturn region, Thorpe method, Labani Channel, Makassar Srait.

STRUKTUR VERTIKAL DAN VARIABILITAS ARLINDO YANG MASUK KE TEPI BARAT LAUT BANDA Atmadipoera, Agus S.; Naulita, Yuli; Nugroho, Dwiyoga; Giu, La Ode M. Gunawan
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 12 No. 2 (2020): 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 | DOI: 10.29244/jitkt.v12i2.29142

Arus Lintas Indonesia (Arlindo) merupakan sistem arus antara samudera Pasifik dan Hindia yang melewati Laut Indonesia, seperti melalui jalur primer Selat Makassar ke Laut Flores dan melalui jalur sekunder Selat Lifamatola ke Laut Banda. Penelitian ini bertujuan untuk mengkaji struktur vertikal dan variabilitas Arlindo di Laut Flores Timur (Flores) dan Laut Banda Utara (Banda) yang berasal dari keluaran model laut INDESO antara tahun 2008 dan 2014. Analisis struktur Arlindo dengan menghitung rataan komponen arus secara vertikal. Volume transpor dihitung dari penampang di Laut Banda dan Laut Flores. Deret waktu Arlindo dianalisis variabilitasnya menggunakan filter band-pass dan transformasi wavelet kontinu. Hasil penelitian menunjukkan bahwa Arlindo Banda secara dominan mengalir ke selatan, sedangkan Arlindo Flores mengalir ke timur di sepanjang utara Kepulauan Nusa Tenggara. Struktur vertikal aliran Arlindo mengalami penguatan di kedalaman antara 50 m dan 150 m. Perkiraan total volume transpor selama periode 7 tahun dari kedua jalur Arlindo yang masuk ke Laut Banda bagian barat sebesar 6,27 Sv (±3,81 Sv), yang merupakan kesepakatan baik dengan studi model sebelumnya. Variasi tahunan transpor Arlindo Banda (Flores) maksimum selama musim Barat Laut (Tenggara) dan minimum selama musim Tenggara (Barat Laut). Variabilitas yang mendominasi pada transpor Arlindo Banda ialah periode intra-musiman (ISV) dan semi-tahunan (SAV), sedangkan variabilitas transpor Arlindo Flores didominasi oleh periode tahunan (AV).

Sebaran Suhu Permukaan Laut Teluk Lampung berdasarkan Citra Landsat-8 dan Kaitannya terhadap Indian Ocean Dipole (IOD) Periode Tahun 2013 – 2021: Sea Surface Temperature Distribution in Lampung Bay Based on Landsat-8 Images and its Relation to the Indian Ocean Dipole (IOD) on the Period Year 2013-2021 Nurjaya, I Wayan; Naulita, Yuli; Rastina; Okgareta, Dema
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 15 No. 3 (2023): 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 | DOI: 10.29244/jitkt.v15i3.48441

Suhu permukaan laut merupakan parameter oseanografi yang penting di perairan lautan karena perubahan suhu air laut dapat mengubah ekosistem perairan. Perairan Teluk Lampung yang berasal dari Samudera Hindia dan Laut Jawa yang melewati Selat Sunda akan dipengaruhi oleh Indian Ocean Dipole (IOD). Penelitian ini bertujuan untuk menganalisis pola sebaran Suhu Permukaan Laut (SPL) antar-tahun secara spasial dan temporal dalam kurun waktu 9 tahun terakhir (2013-2021) serta menganalisis pengaruh fenomena IOD terhadap anomali SPL di Teluk Lampung. Metode yang digunakan adalah metode uji regresi, metode deskriptif dan statistik korelatif. Hasil menunjukkan bahwa nilai SST dari ekstraksi citra Landsat-8 dapat mewakili kondisi SPL in situ dengan uji regresi R2=0,6872. Fenomena IOD memengaruhi pola sebaran SPL perairan Teluk Lampung terlihat pada fase IOD positif (2015, 2018 dan 2019) atau fase IOD negatif (2013 dan 2016) menunjukkan adanya anomali Sea Surface Temperature (SST) perairan Teluk Lampung. Korelasi antara IOD dan SPL di Teluk Lampung memiliki dua hasil yaitu pada perairan terbuka (TL3, TL4, dan TL5) berkorelasi sedang (r>0,7) dan korelasi lemah (r<0,2) pada titik pengamatan TL1 dan TL6 yang merupakan titik dekat dengan daratan.

Co-Authors Agung Tri Nugroho Agus Atmadipoera Alan Frendy Koropitan Ariane Koch-Larrouy Dietriech Geoffrey Bengen Dortje Theodora Silubun Giu, La Ode M. Gunawan I Wayan Nurjaya Indra Jaya Jonson Lumban Gaol Khaldun, Muhammad Hafidz Ibnu Lieng, Lieng Nabil Nabil, Nabil NEVIATY PUTRI ZAMANI Nugroho, Dwiyoga Okgareta, Dema Rastina Zamani, Nevianty P

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