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제안 방법
- In this paper, in order to overcome the increased number of model parameters, we adopt Euler solutions as a priori information to constrain the gravity inversion. The exploration of model parameter space, using prescribed density contrasts, is conducted within the areas where Euler solutions exist.
- However, Euler deconvolution tends to produce too many spurious solutions, depending on the choice of structural index or window size, so it is difficult to interpret gravity data using only the Euler solution method. In this work, we have utilised Euler solutions not as direct interpretations, but as a priori information in the inversion process.
- In the 18m layer, it detected sources but could not resolve each prism. On the other hand, the result using Euler solutions as a priori information to growing body inversion detected and resolved the five prismatic sources separately in each of the 8, 12, and 18 m layers.
- The gravimeter looped back to the base station every two hours for drift correction. The data were tied to the reference station, and earth tide, free-air, and Bouguer corrections were applied. The terrain effect was calculated more precisely by a triangular element method (Rim et al.
- A synthetic model study showed that the inversion algorithm of this study delineate the location of source bodies with high resolution. The scheme was applied to a real field dataset, and the model results showed the development of cavities. Three-dimensional density images of the target area showed the development and distribution of cavities.
- Euler deconvolution tends to produce spurious solutions, and inversion processes sometimes lead to undesirable results because of insufficient a priori information. This study, by adding Euler solutions to gravity inversion, generates more plausible subsurface density distributions. The scheme increased the reliability of the solution by reducing the extent of the inversion model parameter space.
대상 데이터
- The gravity data were collected by a Scintrex CG-3 AutoGrav gravity meter at ~800 stations, with a spacing of 5 m along 17 profiles on paddy paths at about a 30m interval, which provided a semi-gridded dataset. Measurements were made very carefully because of the soft ground surface at the stations.
- ofKorea. The survey site, a Deokbo rice field, is located 3 km north of downtown Muan. The area is being used as a rice field, and has subsidence problems because of excessive pumping for agricultural irrigation.
이론/모형
- A three-dimensional gravity inversion scheme using Euler deconvolution as a priori information was devised. Euler deconvolution tends to produce spurious solutions, and inversion processes sometimes lead to undesirable results because of insufficient a priori information.
- also overlain on the residual anomaly map. The inversion scheme in this study, that is, three-dimensional growing body inversion within spaces around Euler solutions, was applied to the data. The subsurface was divided into four layers of rectangular prismatic cells.
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