PEGGHy non-conformal structural model

DOI

10.24396/ORDAR-184

Closed

2025-07-16

Description:

PEGGHy stands for Platform for Experimental Geophysics, Geotechnics and Hydrogeology. It is a 52m x 20m x 4m subsurface volume which holds artificial, fully controlled geological structures and heterogeneities. Thanks to photogrammetric data acquired by drone, a structural model of the platform has been built using SKUA-Gocad V22. This repo holds a .mx Gocad object which gathers polylines (.pl objects) to represent the heterogeneities (tubes, concrete blocks, and a barrel) and non-conformal surfaces (.ts objects) to represent the faults and the horizons of the platform.

Authors:

paul cupillard

Uploaded on 2025-07-16

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Methodology

- Coordinate Reference System:

The CRS of the model is a local RGF93. The horizontal translation vector from the true RGF93 to the local RGF93 is X0 = 932005.676, Y0 = 6843676.461, meaning that any point (Xtrue, Ytrue) in the true RGF93 frame is moved to the local RGF93 frame by Xlocal = Xtrue - X0, Ylocal = Ytrue - Y0. The origin (X0, Y0) of the local frame corresponds to the south corner of the L1T pulling chamber.

- Uncertainties:

The precision on the surface and heterogeneity locations ranges from 1cm in the well-constrained regions to >20cm in parts of the model where no photogrammetric data are available. In particular, two concrete blocks (block_east and block_west) and a tube (metal_d10_east_deep) are not visible in the photograms.

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PEGGHy non-conformal structural model

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