Ramdani Salam
Prodi Kimia FKIP Unkhair Ternate

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Groundwater resources mapping for small island using Geoelectrical Technique the case study of Ternate Island

Indonesian Journal of Geography Vol 51, No 1 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

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Abstract

The measurement of 2D geo-electrical using Wenner Alpha configuration was conducted in the shore line of northern part of Ternate island, in order to know the depth of interface and to analyze the aquifers in conjunction with estimation of ground water potential. Water quality analysis is also conducted in some dug wells, such as in situ water temperature, electrical conductivity, pH, turbidity, dissolved oxygen, and salinity.Due to laboratory analysis, the values of measured parameters of water quality from some dug wells meets to the standards referred, especially for drinking water. The result of interpretation from geo-electrical data showed the depth of interface less than 10m.  From a drilled well data near shore line, indicate about 5m deep of interface. Base on geo-electrical survey, water quality analysis and field observation can be concluded that Ternate Island has limited potential of ground water, especially related to amount of fresh ground water. Which is now days, no alternative source yet of clean water for domestic use.  

ANALISIS BIDANG KONTAK ANTARA AIR TAWAR DAN AIR ASIN DI DAERAH PESISIR PANTAI PULAU TERNATE DENGAN MENGGUNAKAN METODE GEOLISTRIK (STUDI KASUS DI KELURAHAN KOTA BARU TERNATE)

Green Earth Vol 1, No 1 (2012)
Publisher : Green Earth

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Abstract

The decline of freshwater quality in coastal area one of which is caused by the intrusion of seawater inland. The study was conducted to determine the   interface between seawater and freshwater in northern coastal areas of   Ternate island (case study of Kelurahan Kota Baru) using geoelectric method. By compiling the data in certain formats, the data   are  applied to  Res2DinV. The   inversion result  will show an overview  of resistivity distribution of seawater and freshwater.The result shows that the  interface between freshwater and seawater  at Kotabaru coastal areas,  about 28.6 Ωm - 125Ωm.  The interface tends towards the sea, which showed no contamination between  freshwater and seawater, Keywords: Coastal, Interface, Geoelectric

Penentuan Kedalaman Interface pada Bentuklahan Lereng Gunungapi Bawah dan Bentuklahan Dataran Aluvial Kepesisiran di Pulau Ternate

POSITRON: Berkala Ilmiah Fisika Vol 8, No 1 (2018): May Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

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Abstract

Telah dilakukan pengukuran interface menggunakan metode geolistrik 2D di wilayah pesisir Pulau Ternate. Penelitian ini dimaksudkan untuk menentukan keadaan interface dengan mengajukan asumsi sederhana yang berdasar pada prinsip trigonometri dasar. Pengukuran dilakukan di bagian barat sampai barat daya pada bentuklahan lereng gunungapi bawah dan bentuklahan dataran aluvial kepesisiran.   Hasil pengukuran geolistrik pada keseluruhan lintasan menunjukkan,  ketebalan air tawar pada bentuklahan lereng gunungapi bawah berkisar 7 - 13 m dengan nilai resistivitas antara 25,9 – 100 Ωm.   Ketebalan air tawar pada bentuklahan dataran aluvial kepesisiran antara 15 m hingga kurang dari 20 m dengan nilai resistivitas antara 30 – 109 Ωm.   Kedalaman interface pada bentuklahan lereng gunungapi bawah  sekitar 13 m dari permukaan dengan kemiringan 77o, sedang kedalaman interface pada bentuklahan dataran aluvial kepesisiran sekitar 20 m dari permukaan dengan kemiringan 81o.  Hasil pengukuran menunjukkan bahwa ketebalan air tawar di daerah pesisir bagian barat sampai baratdaya pada bentuklahan lereng gunungapi bawah lebih tipis dibandingkan dengan daerah pesisir bagian timur hingga tenggara pada bentuklahan dataran aluvial kepesisiran.