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USING GEORADAR AS A DAM POREWATER PRESSURE MEASUREMENT: CASE STUDY OF SUTAMI DAM
Yoyok Adisetio Laksono (a*), Siti Zulaikah (a), Sutrisno (a), Zulkifli Yusop (b), Moch Bagas Setya Rahman (a), Qorny Faren Anggana (a)

a) Department of Physics, Universitas Negeri Malang
* yoyok.adisetio.fmipa[at]um.ac.id
b) Centre for Environmental Sustainability & Water Security (IPASA), Faculty of Civil Engineering, Universiti Teknologi Malaysia


Abstract

The piezometer is generally used as a porewater pressure gauge at the core of the dam. Piezometer is placed in the upstream and downstream where if the upstream porewater pressure is higher than the downstream, the dam is in good condition. The piezometer that is planted in the dam can be damaged and the replacement is not possible to be done because it is embedded deep in the core of the dam. Because the piezometer basically measures the height of the water table to the piezometer so that if the height of the water table in the core of the dam is known, so the value of the pressure in the dam is known also. One way to find out the water level is to measure it by using georadar. The purpose of this study was to determine the feasibility of georadar to finding the porewater presure. As a case study, this study was conducted at the Sutami dam which still has a functioning piezometer. Measurements are made by B-scan at the location above the piezometer in the middle of the dam. The Radargram from the GPR is then analyzed in two steps, namely (1) determining the type of core material of the dam, and (2) calculating the pore pressure based on the water level and comparing the result with actual value from piezometer. The result shows that georadar can be used as a substitute for piezometers to measure porewater presure.

Keywords: georadar, porewater presure, dam, Sutami dam

Topic: Electromagnetic Methods

Link: https://ifory.id/abstract/HR4we8L9QFrm

Conference: International Conference on Electromagnetism, Rock Magnetism and Magnetic Material (ICER3M 2019)

Plain Format | Corresponding Author (Yoyok Laksono)

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