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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis JGE (Jurnal Geofisika Eksplorasi) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) OLDI (Oseanologi dan Limnologi di Indonesia) Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan OSEANA Bulletin of Geology Jurnal Geosaintek
Septriono Hari Nugroho
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Biochemistry, Genetics & Molecular Biology Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Library & Information Science Other

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Subsurface Sediment Distribution in The Sumba Waters, East Nusa Tenggara Putra, Purna Sulastya; Nugroho, Septriono Hari
Oseanologi dan Limnologi di Indonesia Vol 2, No 3 (2017)
Publisher : Oseanologi dan Limnologi di Indonesia

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

Abstract

Marine geological survey of the Ekspedisi Widya Nusantara 2016 was conducted in the Sumba Waters on 4 to 26 August 2016 using  Baruna Jaya VIII research vessel. The aim of this survey was to reveal the type and characteristics of the subsurface sediments of the Sumba Waters. A total of 13 samples were taken from the different depth in the subsurface bottom of the sea using grabbing methode with box corer. Grain size analysis were conducted using Mastersizer 2000 to understand the characteristics and the sediment type distribution. In general, the type of the subsurface sediment in the Sumba Waters is ranging from medium to very coarse sandy silt. Distribution of the subsurface sediments is correlated to depths. Grain size of the sediments in the Sumba Strait is coarser than in the western and southern of Sumba Island that directly connected to the Indian Ocean. Distribution of the subsurface sediment showing that the sediment, which are distributed further away from the coast is poorly sorted. The deposition of the subsurface-sea sediment is interpreted to represent a calm, and slow sedimentation mechanism under uniform suspension process.
Characteristics of Grain Size Distribution on Beaches Sediment of Sumba Island, Nusa Tenggara Timur Based on Grainsize and Geochemical Data Nugroho, Septriono Hari; Putra, Purna Sulastya
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 3 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (259.673 KB) | DOI: 10.33332/jgsm.geologi.20.3.153-164

Abstract

Study of beaches sediment characteristics were conducted on three beaches on Sumba Island, East Nusa Tenggara.The research is a part of Widya Nusantara Expedition which conducted by using Research Vessel of Baruna Jaya VIII. The aim of this study is to determine the characteristics of coastal deposits through the observation of grain size by using the grain size trend analysis approach (Grain Size Trend Analysis, commonly abbreviated as GSTA) and geochemical analysis. A total of 36 samples were taken on each coast representing high tide, transition and low tide along the coast. A grain size analysis was performed using a Malvern Mastersizer 2000 that was processed with Gradistat 4.0 software. Geochemical analysis was carried out using X-ray fluorescence spectrometry (XRF). The distribution of beach sediments is dominated by moderate sand - coarse sand and differences on content of geochemical elements (Ca, Sr, Fe, K, and Ti). The coastal conditions that are connected to the Indian Ocean (B1) have different characteristics from the beach that connected to the Sumba strait (B5 and B7). GSTA analysis showed sediment of Laboya Beach finer than sediment on Waikelo and Melolo Beach. Geochemical elements on Laboya Beach indicates different values than others. It indicates there are differences in the provenance and composition of sediment on the all three beaches. The supply of coastal deposits on these three beaches is influenced by the mechanism of precipitation of the walls and the processes of waves and rivers.Keywords: distribution, sediment, grainsize, geochemical, XRF, beach sediment.
Prediksi luas genangan pasang surut (rob) berdasarkan analisis data spasial di Kota Semarang, Indonesia Septriono Hari Nugroho
Jurnal Lingkungan dan Bencana Geologi Vol 4, No 1 (2013)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4549.219 KB) | DOI: 10.34126/jlbg.v4i1.51

Abstract

ABSTRAKFokus dalam penelitian ini adalah memprediksikan luas genangan pasang surut (rob) yang terjadi di Kota Semarang. Simulasi model digunakan untuk mengetahui kondisi genangan rob di tahun 2015 dan 2030. Analisis spasial merupakan metode yang digunakan untuk membuat model tersebut dengan menggunakan data model elevasi digital (DEM) yang diformulasikan menggunakan skenario peramalan. Skenario yang dijalankan adalah (1) skenario genangan akibat penurunan muka tanah dan perubahan rata-rata muka laut (MSL) serta (2) skenario genangan akibat perubahan MSL saja. Pemodelan dilakukan dengan asumsi bahwa tidak ada perubahan penggunaan lahan dan tidak ada konservasi kawasan pesisir selama periode 5 sampai 20 tahun ke depan. Hasil pemodelan menunjukkan bahwa luas genangan dengan skenario 1 lebih besar dari skenario 2, yaitu 8.527,78 ha > 6.662,63 ha (2015) dan 17.692,45 ha > 13.029,58 ha (2030). Upaya penanggulangan banjir rob adalah menutup pintu masuk air laut pada saat air pasang, dan mengoptimalkan bangunan pelabuhan dan tanggul di sepanjang pantai Semarang sebagai penahan banjir yang cukup efektif.Kata kunci: analisis spasial, genangan rob, model elevasi digital (DEM), perubahan rata-rata muka laut(MSL), penurunan muka tanahABSTRACTThe focus of this study is prediction of tidal inundation (rob) in Semarang city, Indonesia. The simulation model of tidal inundation used to understand the condition of tidal inundation in 2015 and 2030. Spatial Analysis is a method to build the model using digital elevation model (DEM) which formulated by forecast scenarios. Scenario run: (1) Scenario of inundation due to land subsidence and changes in mean sea level (MSL), (2) Scenario of inundation because of mean sea level changes only. The modelling was done by assuming that there is no land use changes and conservation of coastal area over a periode of 5 to 20 years. The model results showed that the area of inundation with scenario 1 is larger than scenario 2 about 8,527.78 ha > 6,662.63 ha (2015) and 17,692.45 ha > 13,029.58 ha (2030) respectively. The effort to control tidal flood is to close the entrance of sea water during high tide, and to optimize building and dykes along the coast of Semarang as an effective flood barrier.Keywords: spatial analysis, tidal inundation, digital elevation model (DEM), changes in mean sea level (MSL),land subsidence
Mitigasi dampak kenaikan muka laut di Pantai Alam Indah Kota Tegal Jawa Tengah melalui pendekatan Geomorfologi Septriono Hari Nugroho
Jurnal Lingkungan dan Bencana Geologi Vol 3, No 1 (2012)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1804.341 KB) | DOI: 10.34126/jlbg.v3i1.34

Abstract

SARIPenelitian terkait penanganan kenaikan muka air laut di kawasan wisata Pantai Alam Indah Kota Tegal dilakukan dengan pembuatan profil pantai. Metode yang digunakan adalah survei lapangan dengan analisis deskriptif korelatif. Pantai Alam Indah relatif landai, dengan kemiringan bibir pantai antara 1 – 70, tersusun oleh endapan pasir dan termasuk jenis pantai abrasi. Profil pantai diukur dengan waterpass portable, sehingga dapat diketahui muka laut sekarang dan dapat dibuat prediksi kenaikan muka laut masa datang. Dari hasil pengukuran diperoleh ketinggian dataran pantai sekitar 0,2 – 1,8 m dpl. Apabila kenaikan muka laut di prediksi menjadi 0,5 m maka seluruh segmen pantai akan mampu menghadapi kenaikan muka laut, sehingga air tidak masuk ke daratan. Apabila kenaikan muka air laut naik menjadi 0,8 – 1 m maka sebagian besar dataran pantai terutama bagian timur akan tergenang oleh limpasan air tersebut. Bagian barat dan tengah pantai, hanya mampu menahan air yang datang hingga ketinggian 0,8 m. Persoalan ini dapat ditanggulangi dengan meninggikan dataran tepi pantai, dengan cara pembuatan deretan groin di sepanjang pantai. Deretan groin akan bermanfaat untuk menstabilkan garis pantai, sebagai penangkap sedimen sehingga akan meninggikan dataran tepi pantai dan kawasan tersebut dapat dijadikan kawasan wisata pantai yang aman.Kata kunci: mitigasi, kenaikan muka laut, profil, pantaiABSTRACTThe research related to sea level rise anticipation in tourism area of Alam Indah Beach, Tegal city, handled by making of beach profile. The method used in this research was a field survey with correlative description analysis. The Alam Indah beach has relatively gentle slope, of which the shore line angle ranges between 1o to 7o; it is composed of sand deposits, and it is included to abrasion beach. The beach profile measured by portable water pass, so the present sea level can be reecognized and the future sea level can be predicted. By measuring the coastal plain, the height is obtained which is about 0.2 to 1.8 m above MSL. If the increase of sea level was predicted to 0.5 m, the entire coastal segment will be able to deal with the increase of sea level, so the water does not inundate the land. But, if the sea level increases to
SEDIMENT DISTRIBUTION BASED ON GRAIN SIZE ANALYSES IN WEDA BAY, NORTHERN MALUKU Septriono Hari Nugroho; Abdul Basit
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (503.766 KB) | DOI: 10.29244/jitkt.v6i1.8644

Abstract

An integrated study of sediment distribution was conducted in Weda Bay, Northern Maluku to provide general information on transportation and deposition process based on sediment grain size distribution. The study was conducted during the Weda Bay Expedition using the “Baruna Jaya VII” research vessel in March 13th –22th 2013. Sieving method (granulometric) was used to analyze the grain size. The results indicated that in general the pattern of sea floor sediment distribution was dominated by clay – sand grain-sized. The current speed influenced the sediment transport, deposition, and distribution.  Larger fractions of sediment were quickly settled on the sea floor due to stronger currents around Southern area (Widi islands), meanwhile the lesser fractions of the transported away into other places with weaker currents conditions. Keywords: current, the Weda Bay expedition, granulometric, grain size, sediment distribution
KARAKTERISTIK UMUM DIATOM DAN APLIKASINYA PADA BIDANG GEOSAINS Septriono Hari Nugroho
OSEANA Vol 44 No 1 (2019)
Publisher : Pusat Penelitian Oseanografi LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/oseana.2019.Vol.44No.1.32

Abstract

AN OVERVIEW OF DIATOM AND ITS APPLICATIONS ON THE GEOSCIENCE AREA. Diatoms have been being studied in many countries. Diatoms provide a valuable and well-understood means on biomonitoring – one of which is focused on the base of the aquatic foodweb and highly representative of water quality. They are found in most aquatic environments and the sys tematic and taxonomic investigations of modern and fossil diatoms have been supported by numerous stud ies of distributional ecology. Diatom systematics, taxonomy and ecology indeed offer a wide scope of applications - from water quality to environmental monitoring and biostratigraphy as well as on geoscience area. The application of diatom analysis in determining whether drowning was the cause of death has proven to be a valuable tool in forensic science. Furthermore, diatoms can provide a record of environmental conditions because their relationship to water quality and aquatic habitat has been already known, and the diatom cell wall, which is silicified to form a frustule, is well-preserved, easily detectable and occurs in high numbers in sediment and water. However, this should not be limited to simply make an inventory of data: thoughtful ecology and paleo-ecology will assist in predicting the environmental impact of pollution and climate changes.
SEDIMEN LAUT SEBAGAI PROXY DALAM MENENTUKAN DINAMIKA IKLIM DI MASA LAMPAU Septriono Hari Nugroho
OSEANA Vol 43 No 3 (2018)
Publisher : Pusat Penelitian Oseanografi LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/oseana.2018.Vol.43No.3.58

Abstract

MARINE SEDIMENT AS PROXY TO DETERMINE CLIMATE DYNAMICS IN THE PAST. Studying the dynamics of climate change in the past is important and necessary, because it can serve as a basis for understanding the modern climate and the causes of its variations and changes. Evidence of past climatic conditions is usually archived on traces in nature that provide a proxy of past climatic conditions that we can explore. One of the major sources of proxy data for paleoclimate reconstruction is marine sediment. Microfossils usually used for quantitative proxy is foraminifer, diatom, pollen and etc. For the purposes of paleoclimate, the most important material is foraminifera. The paleoclimate results from the remains of carbonate and silica organisms have been generated from four types of analyzes: (a) oxygen isotope composition, especially calcium carbonate in foraminifer test (b) quantitative interpretation of species and its spatial variation through (c) the ratio of Mg / Ca to the foram test, which is related to temperature, and (d) the morphological variation in certain species resulting from environmental factors.
ANALISIS INPUT SEDIMEN SEJAK PLEISTOSEN AKHIR DI PERAIRAN UTARA PAPUA, SAMUDRA PASIFIK Damanik, Adrianus; Maryunani, Khoiril Anwar; Nugroho, Septriono Hari; Putra, Purna Sulastya
JURNAL GEOLOGI KELAUTAN Vol 19, No 1 (2021)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.19.1.2021.663

Abstract

Perairan Indonesia, salah satunya Perairan Utara Papua, memiliki peran penting dalam sirkulasi global, yaitu sebagai salah satu pintu masuk Arlindo yang mengalir dari Samudra Pasifik menuju Samudra Hindia. Rekonstruksi perubahan input sedimen sejak ~19 ribu tahun lalu dilakukan pada sampel sedimen laut dalam (OS-07) sepanjang 246 cm yang diambil dari kedalaman 4327 m di Perairan Utara Papua, Samudra Pasifik. Sampel diambil pada Ekspedisi Nusa Manggala 2018 dengan menggunakan penginti gravitasi pada Kapal Riset Baruna Jaya VIII. Rekonstruksi input sedimen dilakukan berdasarkan data kandungan unsur kimia Fe, Ti, dan Rb dan normalisasi unsur darat terhadap unsur laut. Input sedimentasi yang tinggi ditunjukkan pada Plesitosen Akhir (~19.5-16 ribu tahun BP) yang kemudian menurun pada pada ~12.5-10 ribu tahun BP yang diinterpretasikan berkaitan dengan peristiwa Younger Dryas. Pada Kala Holosen, input sedimen yang tinggi ditunjukkan pada ~8-5 ribu tahun BP dan ~2-0,5 ribu tahun BP, dan input sedimen yang rendah pada ~11-8 ribu tahun BP dan ~5-2 ribu tahun BP.
BIOSTRATIGRAFI DAN PALEOEKOLOGI WILAYAH LEPAS PANTAI BARAT DAYA SUMBA SEJAK PLEISTOSEN AKHIR BERDASARKAN KUMPULAN FORAMINIFERA PLANKTONIK Ardi, Ryan Dwi Wahyu; Maryunani, Khoiril Anwar; Yulianto, Eko; Putra, Purna Sulastya; Nugroho, Septriono Hari
Bulletin of Geology Vol 3 No 2 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.2.3

Abstract

Foraminifera are microfaunas/microfossils that frequently applied in geology especially for biostratigraphy and paleoecological analysis. This research aim to create biozonation and paleoecological analysis in the region off the southwest coast of Sumba based on planktonic foraminiferal assemblages. This region heavily affected by northwest monsoon – southeast monsoon shift and located next to one of the ITF’s outflow paths (Ombai Strait – Savu Sea) which eventually form its ecological condition. A 235 cm long deep sea sediment core coded ST08 will be used as research material. Foraminifera specimens were determined quantitatively by observing approximately 300 specimens for each split. Each taxon determined from that part then calculated for each individu that was found while different taxa determined from other splits are considered to be one. Biozonation was determined based on either Blow biozonation or Bolli and Saunders biozonation. One zone was obtained based on Blow biozonation which is N23 zone, equal to Pleistocene – Holocene. Two zones were determined based on Bolli and Saunders biozonation which are Globigerinella calida – Clavarotella bermudezi zone (below 147 cm depth), equal to Late Pleistocene and Globorotalia fimbriata zone (0 – 147 cm depth), equal to Holocene. Paleocological analysis focused on the thermocline depth parameter inferred from the relative abundance of thermocline dweller taxa that consist of Neogloboquadrina dutertrei, Puleniatina obliqueloculata, and Globorotalia menardii. Themocline dweller abundance were relatively higher during Pleistocene (49,76 – 75,66%, average 60,01%), indicating shallower thermocline (eutropic condition) while during Holocene its abundance relatively lower (33,90 – 57, 17%, average 45,77%), which indicated thermocline deepening (more oligotropic condition). Those conditions were related to the southeast monsoon domination during Pleistocene (stronger ITF) before its weakening on Holocene which induced northwest monsoon strengthening (weaker ITF).
REKONSTRUKSI PERUBAHAN SUHU PERMUKAAN LAUT BERDASARKAN KUMPULAN FORAMINIFERA DI PERAIRAN UTARA PAPUA, SAMUDRA PASIFIK Damanik, Adrianus; Maryunani, Khoiril Anwar; Nugroho, Septriono Hari; Putra, Purna Sulastya
Bulletin of Geology Vol 4 No 1 (2020): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2020.4.1.4

Abstract

Foraminifera merupakan salah satu proksiterbaik yang digunakan untuk mengetahui kondisi paleoekologi seperti penentuan suhu permukaan laut. Suhu permukaan laut menjadi parameter ekologi yang penting untuk membedakan karakteristik oseanografi pada suatu perairan/cekungan. Penelitian ini melakukan rekonstruksi suhu permukaan laut (SPL) di Perairan Utara Papua berdasarkan kumpulan foraminifera planktonik. Pada penelitian ini digunakan sedimen inti dengan kode OS-07yang diambil pada Ekspedisi Nusa Manggala 2018. Wilayah ini dipilih karena merupakan pintu masuk arlindo (arus lintas Indonesia)sebagai bagian dari sirkulasi globals ehingga Perairan Utara Papua dianggap akan merekam kejadian iklim global. Metoda yang digunakan adalah Modern Analogue Technique (MAT) dan pengelompokan foraminifera di Pasifik mengikuti Parker (1960)dalam Boltovskoy dan Wright (1976). Hasil analisis suhu menggunakan kedua metoda tersebut menunjukkan polaperubahan yang sama. Pada interval kedalaman 246-88 cm dominasi foraminifera zona tropik rendah sedangkan pada kelompok foraminifera subtropik, transitional, dan subantartik mengalami peningkatan yang diinterpretasikan kondisi suhu yang relatif lebih rendah. Foraminifera pada interval kedalaman 88-0 cm mengalamipeningkatan dan terdapat dominasi kelompok foraminifera tropik yang diinterpretasikan adanya kondisi suhu yang relatif lebih tinggi. Hal ini juga selaras dengan hasil rekonstruksi SPL berdasarkan MAT dari data kumpulan foraminifera yang menunjukkan adanya dua pola SPL yaitu pada kedalaman 246-88cm dan 84-0 cm. Peralihan kedua pola, interval kedalaman 86 cm, diinterpretasikan sebagai batas perubahan dari Pleistosen ke Holosen. Perbedaan suhu pada rata-rata untuk bulan Februari pada Pleistosen adalah 1,33oC lebih dingin dibandingkan pada Holosen dan perbedaan suhu pada bulan Agustus adalah 0,82oC lebih dingin pada Pleistosen dibandingkan pada Holosen. Kata kunci: Foraminifera, SPL, MAT, Samudra Pasifik
Co-Authors Abdul Basit Ardi, Ryan Dwi Wahyu Aswan Aswan Cut Novianti Rachmi, Cut Novianti Damanik, Adrianus Dasapta Erwin Irawan, Dasapta Erwin Defny Holidin EKO YULIANTO Galih Kusumah, Galih Hendy Irawan, Hendy Juneman Abraham Keukeu Kaniawati Rosada Kustiati Kustiati Maryunani, Khoiril Anwar Moch Tanzil Multazam Nurhazman Abdul Aziz, Nurhazman Abdul Nurhidayah, Efrilia Mahdilah Pamungkas, Ageng Digdya Garin Purna Sulastya Putra, Purna Sulastya Puteri, Winda Eka Mandiri