ABSTRAKTujuan penyelidikan geofisika ini adalah memprediksi kejenuhan airtanah pada batuan di areal rencana penelitian pilot plant Underground Coal Gasification berdasarkan metode tahanan jenis. Kejenuhan tersebut diinterpretasikan berdasarkan distribusi tahanan jenis (ρ) batuan di bawah permukaan tanah. Data kejenuhan airtanah pada batuan sangat diperlukan dalam operasional gasifikasi batubara bawah tanah, terutama yang berkaitan dengan proses pembakaran lapisan batubara dan gasifikasinya. Dari hasil pemrosesan data dapat diinterpretasikan bahwa hampir seluruh batuan di bawah permukaan di area rencana penelitian memperlihatkan kondisi jenuh dengan airtanah sampai kedalaman 300 meter, yang ditandai dengan nilai ρ<100 Ωm. Kondisi ini merupakan hal yang memerlukan perhatian serius,terutama pada proses pembakaran dan gasifikasi yang lapisan batubaranya terletak di kedalaman 250-300 meter dari permukaan. Nilai ρ>100 Ωm hanya dijumpai pada lintasan tertentu dan pada kedalaman relatif dangkal. Oleh karena itu, sangat disarankan melakukan uji pompa untuk mengetahui potensi akuifer secara kuantitatif. Penyelidikan ini memberikan peringatan dini kemungkinan adanya zona jenuh airtanah yang akan berpengaruh pada proses gasifikasi.Kata kunci: geolistrik, tahanan jenis, kejenuhan airtanah pada batuan, pembakaran, gasifikasi lapisan batubara.
ABSTRACT
The purpose of this geophysical study is to predict the groundwater saturation of rocks in the area of research plans for Underground Coal Gasification pilot plant with geoelectric resistivity method. The saturation is interpreted by the distribution of resistivity (ρ) rocks in the subsurface
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Electricity measurement methods, especially 3-phase power measurement are often constrained by several things, such as the use of several measuring devices for several measurement methods and must be carried out repeatedly to get the accuracy and precision of measurement data, sometimes even the measurement data collection must be obtained within a certain timeframe that is not effective and efficient. Retrieval of measurement data with a measuring instrument must be done by installing a measuring module in the circuit and then the data must be recorded manually. This method has the potential for errors in data collection and data collection. To get over a problem, a measurement method was developed using the IEM3255 module to measure 3 phase power, where the measurement data read can be connected to a web server with the MQTT protocol using IoT (Internet of Thing) technology. With this method, 3-phase power measurement data such as current, voltage, power, frequency and power factor can be stored and read from gadget connected to the internet network.
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