GSLAB - 1 Dionisis Hristopulos

Geostatistics Laboratory (GSLab)

TECHNICAL UNIVERSITY OF CRETE School of Mineral Resources Engineering

Professor Dionisis Hristopulos

Email: dionisi@mred.tuc.gr

Web: http://www.geostatistics.tuc.gr/4908.html

Google Scholar: https://scholar.google.gr/citations?hl=el&user=UosHluAAAAAJ

Research Focus: Development of statistical and stochastic methods for data analysis and applications in environmental problems and energy resources estimation

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Recent Research Activities

Research Topics • Efficient algorithms for processing time series and

scattered space-time data • Scalable models for spatial data • New probabilistic models for extreme events • Simulations of stochastic systems (data driven and model

based) Applications

• Stochastic analysis of groundwater level variability • Simulations of lignite energy content using drill-hole data • Statistical models of earthquake return periods • Analysis of time series (GPS, electricity price fluctuations) • Space-time analysis of rainfall across different scales • Analysis of wind speed fluctuations

Dionisis Hristopulos

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Wind Loading of High-Rise Buildings

Analysis of GPS structural response data and comparison with accelerometer signal from the Republic Plaza Building one of Singapore’s tallest buildings

Raw signals (top)

Dionisis Hristopulos

Hristopulos et al., GPS Solutions, 11 (2007) 85–95

Accelerometer signal and spectrum (top); processed GPS signal and spectrum (left)

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Satellite data reconstruction

Daily column ozone map with missing data due to limited coverage. Source:

NASA, Giovanni online data system

Reconstructed ozone map with Dire-ctional Gradient – Curvature method

Dionisis Hristopulos

Žukovič and Hristopulos, Atmospheric Environment, 77 (2013) 901-909

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Radioactivity Emergency Mapping

Log-values of gamma ground dose rates over Europe with a simulated accidental release of a radioactive plume. Source: BfS, Germany

Reconstructed maps of background and radioactive plume using stochastic optimal linear filter with anisotropy estimation

Dionisis Hristopulos

Hristopulos et al., Computers & Geosciences, 2011

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Analysis of Extreme Event Recurrence Times

Earthquakes are nonlinear, off-equilibrium, non-stationary, spatially distributed phenomena

Stick – slip stochastic model provides justification for Weibull interevent times distribution

Dionisis Hristopulos

Mouslopoulou & Hristopulos, J. Geophys. Res. B, 2011; Hristopulos & Mouslopoulou, Physica A, 2013

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Groundwater Monitoring and Risk Assessment

Wet period, 2003-2004, Mires Basin, Messara valley, Crete

Dry period, 2004-2005, Mires Basin, Messara valley, Crete

Dionisis Hristopulos

Varouchakis and Hristopulos, Advances in Water Resources, 2013