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Delyuzar Ilahude
Marine Geological Institute of Indonesia, Jl. DR. Junjunan No. 236, Telp. 022 603 2020, 603 2201, Faksimile 022 601 7887, Bandung
Earth & Planetary Sciences

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SEDIMENTATION RATE BASED ON OCEANOGAPHIC PARAMETERS REVIEWS IN THE ESTUARY OF KAPUAS, CENTRAL KALIMANTAN Delyuzar Ilahude
BULLETIN OF THE MARINE GEOLOGY Vol 26, No 2 (2011)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (520.322 KB) | DOI: 10.32693/bomg.26.2.2011.36

Abstract

Secara geografis daerah penelitian terletak di muara Sungai Kapuas Kalimantan Tengah. Kawasan pantai ini sangat terbuka dipengaruhi oleh aksi gelombang dari arah tenggara, selatan, baratdaya dan barat. Di pesisir pantai muara Sungai Kapuas terdapat arus sejajar pantai yang bergerak masuk ke arah muara. Pergerakan arus sejajar pantai tersebut memasok sedimen dari arah tenggara dan barat ke muara. Sedimen tersebut cenderung diendapkan di sisi barat dari muara Kapuas. Hal ini menjadi kendala alur pelayaran di muara Sungai Kapuas. Kata kunci : arus sejajar pantai, muara, Kapuas Geographically, the study area is located on the coast of Kapuas River mouth, Central Kalimantan. This open beach area is affected by wave action from southeast, south, southwest and west direction. The longshore current drifts to the estuary on the coastal zone of the Kapuas River. It gives potential sediment supply from the southeast to the north. The sediment tends to be deposited in the western part estuary of Kapuas.This particular thing evokes the ship navigation in Kapuas estuary. Keywords : longshore current, estuary, Kapuas
MAGNETIC ANOMALY PATTERNS USING TREND SURFACE ANALYSIS APPLICATION (TSA) ON MARINE GEOLOGY MAPPING IN THE BALIKPAPAN WATERS Delyuzar Ilahude
BULLETIN OF THE MARINE GEOLOGY Vol 27, No 1 (2012)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1578.523 KB) | DOI: 10.32693/bomg.27.1.2012.42

Abstract

The application of Trend Surface Analysis (TSA) method an geological and geophysical research in map sheets 1813-1814, Balikpapan Waters and its surrounding, shows the significant value of residual anomaly. The magnetic disseverance of regional and total anomaly value obtained the negative anomaly between -50 nT and -350 nT and positive anomaly between +50 nT and +400 nT. The contour of total and regional anomaly shows the magnetic properties of rocks which characterizes the geological arrangements of the research areas. Residual anomaly yielded from the 2nd order value of regional anomaly might be correlated with the formation of basin structures in the central and northern parts of research area, which is interpreted as a part of Kutai Basin. Keywords : TSA method, magnetic anomaly, geology and geophisics, Balikpapan Waters. Penerapan metode TSA dalam penelitian geologi dan geofisika di Lembar Peta 1813-1814, Perairan Balikpapan dan sekitarnya menunjukkan nilai anomali sisa yang cukup signifikan. Hasil pemisahan nilai anomali magnet regional dan anomaly total diperoleh nilai anomali yaitu antara -50 nT dan –350 nT dan anomali positif antara +50 nT dan +400 nT. Kontur anomali total dan anomali regional memperlihatkan sifat kemagnitan batuan yang mencirikan tatanan geologi daerah penelitian. Anomali sisa dihasilkan dari nilai anomali regional orde ke 2, kemungkinan berkaitan dengan pembentukan struktur cekungan di bagian tengah dan utara daerah penelitian yang ditafsirkan sebagai bagian dari Cekungan Kutai. Kata kunci : metode TSA, anomali magnet, geologi dan geofisika, Perairan Balikpapan.
HEAVY METAL CONTENTS IN MARINE SEDIMENTS AND SEAWATER AT TOTOK BAY AREA, NORTH SULAWESI Delyuzar Ilahude
BULLETIN OF THE MARINE GEOLOGY Vol 25, No 1 (2010)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (453.414 KB) | DOI: 10.32693/bomg.25.1.2010.24

Abstract

The study area is located in north-eastern part of Tomini Bay, approximately 80 km south of Manado city, North Sulawesi. This area is closed to submarine tailing disposal system in Buyat Bay. Five marine sediment samples and four water samples from seawater and dig wells have been used for heavy metals (Hg, As, CN) analyses by using Atomic Absorption Spectrometry (AAS). This study is a part of research conducted by Marine Geological Institute of Indonesia on morphological changes of seabed in the Totok Bay. The result shows that concentration of mercury (Hg) in water samples taken from Ratatotok estuary is higher than standards stipulated Government Regulation (Peraturan Pemerintah/PP) No. 82/2001. Meanwhile, concentration of arsenic (As) is almost reaching its standard threshold, and conversely cyanide (CN) concentration is low. This value of mercury (Hg) concentration taken from Ratatotok estuary is much higher than water samples from of Buyat Bay estuary. Significant concentration of mercury (Hg) analysed from those particular sampling sites indicated high mercury contamination. Therefore, further examination on ground water of dig wells is necessary, especially for mercury analysis (Hg). Furthermore, comparing the formerly obtained data of mercury concentration in the sediment, this particular study concludes that the sediments in the Totok Bay had contaminated by mercury from gold-processing of illegal mining. Keywords: pollution, heavy metal, marine sediment, seawater, Totok Bay Daerah penelitian terletak di bagian timur laut Teluk Tomini, sekitar 80 km selatan kota Manado, Sulawesi Utara. Lokasi ini berdekatan dengan tempat pembuangan limbah tambang bawah laut di Teluk Buyat. Lima contoh sedimen laut, lima buah contoh air dari laut dan sumur telah digunakan untuk analisa logam berat (Hg, As, dan CN) menggunakan metode Atomic Absorption Spectrometry AAS. Studi ini merupakan bagian dari penelitian yang dilakukan oleh Marine Geological Institute of Indonesia tentang perubahan morfologi dasar laut di Teluk Totok. Hasil penelitian menunjukkan bahwa kandungan merkuri dalam contoh air yang diambil dari sekitar muara sungai Ratatotok lebih tinggi dari standar Peraturan Pemerintah/PP No. 82/2001. Sementara itu, konsentrasi arsen (As) hampir mencapai ambang batas standar dan konsentrasi sianida (CN) jauh lebih rendah dari standar ambang batas. Nilai kandungan merkuri di estuari Ratatotok lebih tinggi dibandingkan dengan contoh air yang terukur dari muara sungai di Teluk Buyat. Kandungan merkuri yang tinggi ini menunjukkan adanya indikasi pencemaran logam berat, dan oleh karena itu air di sumur-sumur penduduk perlu dilakukan penelitian lebih lanjut, khususnya untuk analisa merkuri. Selain itu, berdasarkan perbandingan kandungan merkuri dalam sedimen pada penelitian sebelumnya, dapat disimpulkan bahwa Teluk Totok telah mengalami kontaminasi merkuri dari penambangan emas ilegal. Kata kunci: polusi, logam berat, sedimen laut, air laut, Teluk Totok
ABRASION WAVE OBSTRUCTS TOURISM DEVELOPMENT IN COASTAL REGIONS OF BINUANGEUN, LEBAK - BANTEN Delyuzar Ilahude; Udaya Kamiludin
BULLETIN OF THE MARINE GEOLOGY Vol 26, No 1 (2011)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.94 KB) | DOI: 10.32693/bomg.26.1.2011.34

Abstract

Geographically, the study area is located in the southern coast of Java and also exposed to the influence of wave energy from the southeast, south and southwest. The energy flux of waves generated by surface wind components that affect the coastline and the surrounding waters of Binuangeun. The impact of the wave coming from southeast direction caused a continuous abrasion process in Binuangeun coast and its adjacent areas, included the tourism area in the eastern part of Binuangeun coast towards the center of the study area. The current movement along the coast was accompanied by sediments deposition which tends to westward. The value of sediments supply (Vq) in sample area point number 9 was bigger than the sample area number 4 about 33.703 m3/year within the same direction tendency of sediments deposition. Western part of Binuangeun coastal area would presumably become the sediment accumulation point throughout the year, while the erosion process in the central part of the study area were expanding and occured seasonally. Keywords : abrasion, Binuangeun, flux energy Secara geografis daerah penelitian terletak di pesisir selatan Pulau Jawa dan termasuk pantai terbuka terhadap pengaruh energi gelombang dari arah tenggara, selatan dan barat daya. Energi fluks gelombang yang dibangkitkan oleh komponen angin permukaan berpengaruh terhadap garis pantai perairan Binuangen dan sekitarnya. Efek gelombang dari arah tenggara mengakibatkan proses abrasi di pantai Binuangen dan sekitarnya, terutama kawasan wisata bagian timur pantai Binuangen hingga ke bagian tengah. Pergerakan arus sepanjang pantainya disertai oleh pengendapan sedimen yang cenderung mengarah ke barat. Nilai pasokan sedimen (Vq) pada titik tinjau 9 lebih besar dari pada di titik 4 yaitu sebesar 33.703 m3/tahun dengan pasokan sedimen cenderung bergerak ke arah barat. Daerah pesisir kawasan bagian barat Binuangen diperkirakan akan menjadi zona akumulasi sedimen sepanjang tahun, sementara proses erosi di bagian tengah daerah penelitian tetap berkembang dan berlangsung secara musiman. Kata kunci : abrasi, Binuangen, energi fluks
Co-Authors Udaya Kamiludin