Research on the 3D implicit potential field modeling method for urban underground space based on the open-source GemPy

Zhou LIAO, Mei LI

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Earth Science Frontiers ›› 2024, Vol. 31 ›› Issue (3) : 482-497. DOI: 10.13745/j.esf.sf.2024.2.30

Research on the 3D implicit potential field modeling method for urban underground space based on the open-source GemPy

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Abstract

Three-dimensional geological modeling is essential for urban subterranean space planning and management. In the era of geological big data, there is a shift towards implicit modeling techniques. While commercial software like GeoModeller and Surpac offer implicit modeling capabilities, they are proprietary and lack open-source accessibility. This paper focuses on the open-source GemPy modeling platform, utilizing three-dimensional implicit potential field modeling techniques and presenting an algorithmic solution for geological pinch-outs. The proposed approach is integrated into GemPy’s foundational modeling architecture. Through a case study of a specific urban area, the paper demonstrates the workflow for fine-scale three-dimensional geological modeling. A modeling dataset is created using borehole data and the potential field method, along with pan-Kriging interpolation, to establish a three-dimensional geological model of the urban area. Specialized techniques are employed to address urban pinch-outs. To visualize geological interfaces in the model, 18 engineering geological layers are individually displayed. The model’s accuracy is assessed using stratified K-fold cross-validation, including metrics like the Pearson correlation coefficient (CC). Experimental results show that the three-dimensional implicit potential field geological modeling method in GemPy is suitable for urban geological structures, providing a reliable foundation for decision-making in urban subterranean development.

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three-dimensional geological modeling / implicit potential field method / GemPy / stratigraphic pinch-outs / urban subterranean space

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Zhou LIAO , Mei LI. Research on the 3D implicit potential field modeling method for urban underground space based on the open-source GemPy. Earth Science Frontiers. 2024, 31(3): 482-497 https://doi.org/10.13745/j.esf.sf.2024.2.30

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