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All Journal IJOG : Indonesian Journal on Geoscience Geoid - Journal of Geodesy and Geomatics
Tubagus Solihuddin
Center for Research and Development of Marine and Coastal Resources
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Engineering Environmental Science

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A Drowning Sunda Shelf Model during Last Glacial Maximum (LGM) and Holocene: A Review Solihuddin, Tubagus
Indonesian Journal on Geoscience Vol 1, No 2 (2014)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1022.155 KB) | DOI: 10.17014/ijog.v1i2.182

Abstract

DOI: 10.17014/ijog.v1i2.182Rising sea levels since the Last Glacial Maximum (LGM), some ~20,000 years ago, has drowned the Sunda Shelf and generated the complex coastal morphology as seen today. The pattern of drowning of the shelf will be utilized to assess likely timing of shoreline displacements and the duration of shelf exposure during the postglacial sea level rise. From existing sea level records around Sunda Shelf region, “sea level curve” was assembled to reconstruct the shelf drowning events. A five stage drowning model is proposed, including 1) maximum exposure of the shelf at approximately 20,500 years Before Present (y.B.P.), when sea level had fallen to about -118 m below present sea level (bpl.), 2) melt water pulse (MWP) 1A at ~14,000 y.B.P. when sea level rose to about -80 m bpl., 3) melt water pulse (MWP) 1B at ~11,500 y.B.P., when sea level was predicted around -50 m bpl., 4) Early-Holocene at ~9,700 y.B.P, when sea level was predicted at about-30 m bpl, and 5) sea level high stand at ~4,000 y.B.P., when sea level jumped to approx. +5 m above present sea level (apl.). This study shows that the sea level fluctuated by more than 120 m at various times during LGM and Holocene. Also confirmed that sea level curve of Sunda Shelf seems to fit well when combined with sea level curve from Barbados, although the comparison remains controversial until now due to the considerable distinction of tectonic and hydro-isostatic settings.  
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

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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.
STUDI PERUBAHAN MUATAN PADATAN TERSUSPENSI ( TSM ) DI SELAT MADURA AKIBAT PEMBUANGAN LUMPUR LAPINDO Arifin, Irfan Samsul; Sukojo, Bangun Muljo; Solihuddin, Tubagus
GEOID Vol. 5 No. 1 (2009)
Publisher : Departemen Teknik Geomatika ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/geoid.v5i1.1276

Abstract

Semburan Lumpur lapindo yang terjadi di Kecamatan Porong Kabupaten Sidoarjo yang  kemudian dialirkan  di kali porong yang bermuara di Selat Madura akan berpengaruh terhadap kondisi perairan di Selat Madura.Salah satunya Muatan Padatan Tersuspensi (TSM). Maka diperlukan pemantauan perubahahan Muatan Padatan Tersuspensi (TSM) di Selat Madura Tersebut. Dalam penelitian ini digunakan data citra ASTER Selat Madura tahun 2005, 2006, 2007 dan 2008. Metode yang digunakan adalah  mengkonversi  nilai Digital number ke dalam bentuk refkektan dan memasukkan algortihma syarief budhiman sehingga nilai Muatan Padatan Tersuspensi (TSM) dapat diketahui. Kemudian tahap selanjutnya adalah tahap kasifikasi dimana Muatan Padatan Tersuspensi (TSM) tersebut terbagi dalam beberapa kelas  yang tersebar di perairan Selat Madura Surabaya, Sidoarjo Dan Pasuruan.    Hasil penelitian menunjukkan perubahan muatan padatan tersuspensi (TSM) akibat pembuangan Lumpur Lapindo di Selat Madura sangat bervariatif dimana dari tahun 2005 sampai tahun 2008 nilai Muatan Padatan Tersuspensi (TSM) terjadi penambahan dan penurunan dalam setiap kelasnya. Pada kelas 0-25 mg/l mengalami kenaikan dari 5029,350 Ha menjadi 16405,166Ha, kelas 25-50 mg/l mengalami penurunan dari 13236,863 Ha menjadi 12461,497 Ha, kelas 50-75 mg/l mengalami kenaikan dari 18242,147 Ha menjadi 23082,983 Ha, kelas 75-100 mg/l mengalami penurunan dari 14696,356 Ha menjadi  2256,934 Ha Sedangkan kelas > 100 mg/l mengalami penurunan dari 5326,725 Ha menjadi 1066,536 Ha. Dari uji statistik menunjukkan bahwa Hubungan antara data citra dengan dua pengambilan data lapangan yang diambil dalam waktu yang berbeda mempunyai hubungan yang signifikan yaitu R² = 52,1% pada pengambilan data pertama dan R² = 57,8% pada pengambilan data yang kedua sedangkan untuk nilai RMS rata-rata sebesar 0,274  dan RMS total sebesar 3,286.  
Co-Authors Arifin, Irfan Samsul Bangun Muljo Sukojo, Bangun Muljo Hadiwijaya Lesmana Salim, Hadiwijaya Lesmana Joko Prihantono, Joko Utami, Dwi Amanda