Characterization of Ground Penetrating Radar Reflection Patterns in the Peatlands of Kubu Raya Regency, Indonesia
DOI:
https://doi.org/10.11113/mjfas.v22n2.4863Keywords:
Dielectric Contrast, Ground Penetrating Radar, Peatland, Reflection PatternsAbstract
Ground Penetrating Radar (GPR) is a geophysical method that uses electromagnetic waves to map utilities and subsurface layers. It transmits electromagnetic waves, reflects them when they contact the medium, and then records them. Peatlands have unique properties, characterized by low density due to their composition of partially decomposed organic matter and a very high water storage capacity of up to 90% of the total volume. This research aims to interpret the reflection patterns in the subsurface layer of peatland areas. This research used a Plug-in Cobra GPR SE70 system operating at 80 MHz. The research location was in Rasau Jaya Sub-district, Kubu Raya Regency, Indonesia. Data acquisition in the field applied ten tracks with lengths varying from 162 m to 287 m. The data processing consisted of several stages, namely static correction, subtract-mean (dewow), Butterworth bandpass, background removal, average subtraction, and manual gain. The results showed that the reflection patterns on the peat layer showed random/irregular diffraction and undulated (hummocky) with high amplitude. In contrast, the reflection patterns on the clay layer showed parallel to wavy patterns with low amplitude. The results also showed that the peat layer thickness at the research location ranged from 1.07 m to 2.78 m. These findings serve as an essential reference for GPR surveys using the same approach in other areas to improve carbon reserve estimates and assess hydrological risks in peatlands of Kubu Raya Regency.
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