3D digital geological modelling of paleo-surfaces. A case study from the national nuclear waste depository site in Hungary

Gergely Korody, G. Jordán

Research output: Contribution to journalArticle

Abstract

The site of the final disposal facility for radioactive waste of the Paks Nuclear Power Plant at Bátaapáti in Hungary is under intensive geological survey, including paleo-environmental and paleo-surface investigations. The objective of this paper is to present the results of a borehole database analysis and modelling for the pre-Quaternary paleo-surface reconstruction in this important area. Data are heights above sea level of this paleo-surface measured in drill cores. The analysis is based on the assumption that a geological process such as hill slope erosion produces a statistically homogeneous distribution of the measured variable, paleo-surface depth in this case. During spatial trend analysis the obtained six statistically significant paleo-surface depth populations are divided into 13 trend surfaces significant at the 95% confidence level. The model gained by merging the 13 local trend surfaces describe the overall slope conditions. The other surface model is obtained by the accurate linear Triangular Irregular Network (TIN) interpolation capturing all the local details of morphological information. The original 10m grid TIN model is generalised by average smoothing filter with window size increasing from 25m to 1,000m in order to reveal morphological 'trends' at various spatial scales. Analysis of morphological lineaments confirm that major valleys run along regional fault lines, while secondary erosion processes forming the smaller side valleys act at scales below 1km. In this way the pre-Quaternary and younger paleo-valleys can be distingushed from the higher spatial scale tectonic forms. The stationary residuals remaining after trend removal enables detailed surface reconstruction by kriging interpolation.

Original languageEnglish
Pages (from-to)237-252
Number of pages16
JournalCarpathian Journal of Earth and Environmental Sciences
Volume9
Issue number4
Publication statusPublished - 2014

Fingerprint

radioactive waste
modeling
valley
interpolation
erosion
trend analysis
nuclear power plant
lineament
kriging
smoothing
geological survey
borehole
sea level
filter
tectonics
trend
analysis

Keywords

  • Granite
  • Paleo-surface
  • Smoothing
  • Tectonic geo-morphometry
  • Tin
  • Trend

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

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title = "3D digital geological modelling of paleo-surfaces. A case study from the national nuclear waste depository site in Hungary",
abstract = "The site of the final disposal facility for radioactive waste of the Paks Nuclear Power Plant at B{\'a}taap{\'a}ti in Hungary is under intensive geological survey, including paleo-environmental and paleo-surface investigations. The objective of this paper is to present the results of a borehole database analysis and modelling for the pre-Quaternary paleo-surface reconstruction in this important area. Data are heights above sea level of this paleo-surface measured in drill cores. The analysis is based on the assumption that a geological process such as hill slope erosion produces a statistically homogeneous distribution of the measured variable, paleo-surface depth in this case. During spatial trend analysis the obtained six statistically significant paleo-surface depth populations are divided into 13 trend surfaces significant at the 95{\%} confidence level. The model gained by merging the 13 local trend surfaces describe the overall slope conditions. The other surface model is obtained by the accurate linear Triangular Irregular Network (TIN) interpolation capturing all the local details of morphological information. The original 10m grid TIN model is generalised by average smoothing filter with window size increasing from 25m to 1,000m in order to reveal morphological 'trends' at various spatial scales. Analysis of morphological lineaments confirm that major valleys run along regional fault lines, while secondary erosion processes forming the smaller side valleys act at scales below 1km. In this way the pre-Quaternary and younger paleo-valleys can be distingushed from the higher spatial scale tectonic forms. The stationary residuals remaining after trend removal enables detailed surface reconstruction by kriging interpolation.",
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