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Johanis Dominggus Lekalette
Pusat Penelitian Laut Dalam, Lembaga Ilmu Pengetahuan Indonesia
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PHOSPHATE AND NITRATE DISTRIBUTION IN INNER AMBON BAY DURING NORTHWEST AND SOUTHEAST MONSOON Idha Yulia Ikhsani; Malik Sudin Abdul; Johanis Dominggus Lekalette
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (668.978 KB) | DOI: 10.14203/widyariset.2.2.2016.86-95

Abstract

This study has compared the distribution of nutrients phosphate and nitrate concentrations in the inner Ambon Bay during two different seasons: Northwest and Southeast monsoon. The result showed that the nutrient concentrations in the Southeast monsoon were higher than those in the Northwest monsoon, both for phosphate and nitrate. The ranges of phosphate concentrations on the surface and near the bottom of the bay during the Northwest monsoon were 0.0471-0.0549 mg/L and 0.0549–0.1176 mg/L, while the ranges of nitrate concentrations were from undetected to 0.0976 mg/L on the surface, and 0.0956–0.5870 mg/L near the bottom of the bay. Meanwhile, the phosphate and nitrate concentration on the surface during the Southeast monsoon were 0.0495–0.0676 mg/L and 0.0247–0.4019 mg/L, while near the bottom the concentrations were 0.0495–0.1802 mg/L and 0.0247– 0.7944 mg/L. These results indicated that phosphate and nitrate concentrations in the inner Ambon Bay have exceeded the marine water standard quality, which can be categorized as polluted. High concentrations of phosphate and nitrate during Northwest monsoon could be caused by run-off from the mainland area that enters the bay trough the river. On the other hand, the enrichment of nutrients in the inner Ambon Bay during the Southeast monsoon could be dominated by the “nutrient-rich water mass” from Banda Sea that enters the inner Ambon Bay.
PHOSPHATE AND NITRATE DISTRIBUTION IN INNER AMBON BAY DURING NORTHWEST AND SOUTHEAST MONSOON Idha Yulia Ikhsani; Malik Sudin Abdul; Johanis Dominggus Lekalette
Widyariset Vol 2, No 2 (2016): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.2.2.2016.86-95

Abstract

This study has compared the distribution of nutrients phosphate and nitrate concentrations in the inner Ambon Bay during two different seasons: Northwest and Southeast monsoon. The result showed that the nutrient concentrations in the Southeast monsoon were higher than those in the Northwest monsoon, both for phosphate and nitrate. The ranges of phosphate concentrations on the surface and near the bottom of the bay during the Northwest monsoon were 0.0471-0.0549 mg/L and 0.0549–0.1176 mg/L, while the ranges of nitrate concentrations were from undetected to 0.0976 mg/L on the surface, and 0.0956–0.5870 mg/L near the bottom of the bay. Meanwhile, the phosphate and nitrate concentration on the surface during the Southeast monsoon were 0.0495–0.0676 mg/L and 0.0247–0.4019 mg/L, while near the bottom the concentrations were 0.0495–0.1802 mg/L and 0.0247– 0.7944 mg/L. These results indicated that phosphate and nitrate concentrations in the inner Ambon Bay have exceeded the marine water standard quality, which can be categorized as polluted. High concentrations of phosphate and nitrate during Northwest monsoon could be caused by run-off from the mainland area that enters the bay trough the river. On the other hand, the enrichment of nutrients in the inner Ambon Bay during the Southeast monsoon could be dominated by the “nutrient-rich water mass” from Banda Sea that enters the inner Ambon Bay.
Aplikasi Metode Geolistrik Konfigurasi Dipole-Dipole untuk Identifikasi Daerah Rawan Longsor (Studi Kasus di Desa Poka, Ambon) Rian Amukti; Cahya Damayanti; Abdul Kadir Yamko; Johanis Dominggus Lekalette
TEKNIK Vol 42, No 1 (2021)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i1.29035

Abstract

Bencana longsor merupakan salah satu jenis bencana yang sering terjadi di Indonesia yang menyebabkan banyak korban jiwa dan kehilangan harta benda. Kota Ambon merupakan daerah potensi longsor yang tinggi. Hal ini karena Kota Ambon merupakan daerah dengan kemiringan lereng yang curam, dan curah hujan yang tinggi sehingga dibutuhkan kajian untuk menanggulangi hal tersebut sebagai upaya mitigasi bencana. Penelitian ini bertujuan untuk mengetahui bidang gelincir longsoran dan arah longsoran sebagai dasar untuk identifikasi daerah rawan longsor dengan menggunakan metode geolistrik konfigurasi dipole-dipole. Penelitian ini telah dilakukan di Desa Poka, Kota Ambon, Propinsi Maluku. Pengukuran geolistrik menggunakan alat AGI Ministing dengan pengambilan data sebanyak 5 lintasan. Berdasarkan hasil analisis didapatkan bahwa lapisan tanah yang didominasi dengan lempung dan gamping. Hasil rekonstruksi menunjukkan bahwa topografi daerah tersebut merupakan lereng dengan kemiringan 45o-80o, dan bidang gelincir terdapat setiap lintasan dengan kontras resistivitas ±25-60 Ωm  pada kedalaman 5-15 meter, sedangkan arah longsoran mengarah pada arah tenggara.
Co-Authors Abdul Kadir Yamko Cahya Damayanti Idha Yulia Ikhsani Malik Sudin Abdul Rian Amukti