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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Chart Datum Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Joko Prihantono, Joko
Peneliti Pada Pusat Penelitian dan Pengembangan Sumber Daya Laut dan Pesisir, Balitbang KP, Kementerian Kelautan dan Perikanan
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology

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Sedimentary Environment of a Modern Carbonate Platform of Karimunjawa Islands, Central Java Solihuddin, Tubagus; Utami, Dwi Amanda; Salim, Hadiwijaya Lesmana; Prihantono, Joko
Indonesian Journal on Geoscience Vol 6, No 1 (2019)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4221.051 KB) | DOI: 10.17014/ijog.6.1.57-72

Abstract

DOI: 10.17014/ijog.6.1.57-72Sitting in a biodiversity “hotspot” of the mid-Sunda Shelf region, Karimunjawa Islands have currently been the priority for marine biodiversity conservation. Knowledge of surface sediments on modern carbonate platform is one of essential information to support conservation policies, but such has received little attention from reef researchers. This study describes the sediment characteristics of the selected modern carbonate platforms of Karimunjawa Islands through integrated sediments and satellite data analysis. Textural group of sediments indicates that moderate to poorly sorted gravelly sands are dominant with no grading pattern concerning geomorphological and habitat succession from landward to seaward. Sediment compositions are predominantly bioclastic components, comprising coral and mollusks as the highest and the second highest estimated order of abundance. The reworked grains and rock fragments, although present, are not volumentary abundant. The carbonate sedimentary facies is primarily composed of mud-lean packstone with additional proportion of grainstone and packstone. There are only slight distinct sedimentological characteristics for all benthic habitats as shown by the principal component analysis revealing overlap relationship between sediment parameters and benthic habitats. The study provides the first characterization of sediments which operate on the modern carbonate platform of Karimunjawa Islands along with their controlling factors and specialized nature.
Sebaran dan Estimasi Ketebalan Sedimen Permukaan Dasar Laut Berdasarkan Nilai Koefisien Refleksi Sub Bottom Profiler (Studi Kasus Perairan Utara Serang, Banten) Ardiyarta, Bayu; Prihantono, joko; Mulyadi, Dikdik S.; Mustika Alam, Tasdik
Jurnal Chart Datum Vol. 4 No. 2 (2018): JURNAL CHART DATUM
Publisher : Sekolah Tinggi Teknologi Angkatan Laut (STTAL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37875/chartdatum.v4i2.132

Abstract

Peningkatan aktivitas di bidang reklamasi pesisir berupa penambangan pasir dan mineral, operasi pengerukan (dredging) serta pembangunan sarana pemukiman diwilayah pesisir membutuhkan peta-peta dasar laut yang akurat. Sub Bottom Profiler (SBP) merupakan salah satu instrument akustik bawah air yang mempunyai frekuensi yang rendah, sehingga mampu menggambarkan lapisan sedimen dibawah dasar laut. Informasi jenis sedimen dasar laut dapat dilakukan dengan menggunakan metode akustik bawah laut termasuk dengan menggunakan SBP. Keunggulan SBP dibandingkan instrument akustik bawah air lainnya adalah dapat digunakan untuk mengestimasi ketebalan sedimen permukaan tersebut. Pada penelitian ini telah dilakukan klasifikasi sedimen permukaan dasar laut di perairan utara Kabupaten Banten dengan cara menghitung nilai koefisien refleksi data SBP dengan membandingkan energi pantulan (ERx) dengan energi yang dipancarkan (ETx) yang kemudian dikalibrasi dengan data sampling sedimen yang juga diambil pada saat survei dilakukan. Sedangkan ketebalan sedimen permukaan dilakukan dengan melakukan picking horizon di penampang SBP antara lapisan dasar laut dengan reflector yang pertama. Selisih antara dua reflector tersebut merupakan nilai ketebalan. Area survei adalah perairan utara kabupaten Serang Banten karena lokasi ini merupakan area penambangan pasir, sehingga memiliki jenis sedimen yang homogen. Hasil dari penelitian ini adalah nilai koefisien refleksi dengan rata-rata 0.3076 sampai dengan 0.4501 yang kemudian diklasifikasikan sesuai dengan tabel Hamilton 1982 pasir kasar, pasir halus, pasir sangat halus dan pasir lembut. Nilai ketebalan sedimen berkisar antara 0 sampai dengan 6.3 meter dengan rata-rata 1.47 meter.
Pendugaan Potensi Volume Akuifer Menggunakan Metode Geolistrik di Pulau Gili Ketapang, Probolinggo, Jawa Timur Pryambodo, Dino Gunawan; Prihantono, Joko
EKSPLORIUM Vol. 40 No. 1 (2019): MEI 2019
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2019.40.1.5415

Abstract

Geoelectric measurement using Schlumberger configuration was carried out in Gili Ketapang Island, a small island with a population density of 12,356 people/km2. The measurement conducted at 8 locations using a vertical electrical sounding (VES) method. The result of geoelectric data processing shows aquifer resistivity value ranging from 2.71–206 Ωm at the sandy limestone lithology. The largest aquifer volume potency based on the 2D groundwater aquifer model is in the K-03 and K-17 location. The 3D groundwater aquifer model shows that the aquifer volume is 27,689,400 m3 or about 27.689.400.000 liters. The groundwater inside the aquifer will last within 68 years in a condition where there is no population increase. Besides, the groundwater also lasts even there is no water addition inside the aquifer, by natural or artificial
Co-Authors Ardiyarta, Bayu Dino Gunawan Pryambodo, Dino Gunawan Hadiwijaya Lesmana Salim, Hadiwijaya Lesmana Mulyadi, Dikdik S. Tasdik Mustika Alam, Tasdik Mustika Tubagus Solihuddin Utami, Dwi Amanda