Development of an integrated ground model for IJmuiden Ver Gamma using geology, geophysics and geotechnics

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4. Development of an integrated ground model for IJmuiden Ver Gamma using geology, geophysics and geotechnics

This paper describes the development of a Quantitative Integrated Ground Model, a collaborative effort that merges geophysical and geotechnical data in a consistent geological framework. We use geophysical, geotechnical, and biostratigraphic data to define a sequence of five principal seismostratigraphic facies. These facies, characterized by their seismic architecture, lithology, and chronostratigraphic origin, capture the complex geological evolution of the study area. The geological units are further refined to map changes in particle size distributions using geophysical and geotechnical data, always linked to potential geological events. This yields a 3D structural model of the wind farm area, forming the basis for our geotechnical interpretation of each unit. We have also developed a prediction model, using the results of an elastic inversion as input to a neural network to predict the CPT response and prediction range along all seismic lines. This, along with site-specific CPT correlations, allows us to predict geotechnical parameters along all seismic lines, interpolate them within the structural framework, and inform cable or foundation design throughout the wind farm area. An essential part of this workflow is the understanding and inclusion of uncertainties identified in the project's different parts.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

4 - Ground models