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http://dx.doi.org/10.7780/kjrs.2017.33.3.2

Application of Relative Gravity Surveying and Modeling to Sinkhole Detection  

Kim, Jinsoo (Department of Spatial Information Engineering, Pukyong National University)
Lee, Young-Cheol (The Center for High Energy Physics, Kyungpook National University)
Lee, Jung-Mo (Department of Geology, Kyungpook National University)
Publication Information
Korean Journal of Remote Sensing / v.33, no.3, 2017 , pp. 267-274 More about this Journal
Abstract
The purpose of this research was to develop and present methods to detect sinkholes which can exist underneath the surface of the ground. First, we buried a water tank with dimensions $1.8{\times}0.8{\times}0.8m$ at a distance of 1.8 m from the surface. This played the role of the sinkhole. Secondly, we created a square zone with sides 12 meters away from the buried water tank. Within this zone, we measured the gravity at 1-meter intervals using a Scintrex CG5 relative gravimeter with a resolution of 0.001 mGal. Additionally, we performed three-dimensional (3-D) gravity modeling to calculate the theoretical values of the relative gravity around our model sinkhole. The resulting values for the relative gravity around the sinkhole depended on the method used. The measured effect of gravity was 0.036 mGal and the effect calculated using 3-D modeling was 0.024 mGal. Our results suggest that sinkholes that are similar in size to the water tank used in this study can be detected using relative gravity surveys. Smaller sinkholes can be detected by reducing the intervals between the relative gravity measurements.
Keywords
Sinkhole; Gravity; Relative Gravity Surveying; Gravity Modeling;
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