TY - JOUR
T1 - Combination of geostatistics and self-organizing maps for the spatial analysis of groundwater level variations in complex hydrogeological systems
AU - Varouchakis, Emmanouil A.
AU - Solomatine, Dimitri
AU - Corzo Perez, Gerald A.
AU - Jomaa, Seifeddine
AU - Karatzas, George P.
PY - 2023
Y1 - 2023
N2 - Successful modelling of the groundwater level variations in hydrogeological systems in complex formations considerably depends on spatial and temporal data availability and knowledge of the boundary conditions. Geostatistics plays an important role in model-related data analysis and preparation, but has specific limitations when the aquifer system is inhomogeneous. This study combines geostatistics with machine learning approaches to solve problems in complex aquifer systems. Herein, the emphasis is given to cases where the available dataset is large and randomly distributed in the different aquifer types of the hydrogeological system. Self-Organizing Maps can be applied to identify locally similar input data, to substitute the usually uncertain correlation length of the variogram model that estimates the correlated neighborhood, and then by means of Transgaussian Kriging to estimate the bias corrected spatial distribution of groundwater level. The proposed methodology was tested on a large dataset of groundwater level data in a complex hydrogeological area. The obtained results have shown a significant improvement compared to the ones obtained by classical geostatistical approaches.
AB - Successful modelling of the groundwater level variations in hydrogeological systems in complex formations considerably depends on spatial and temporal data availability and knowledge of the boundary conditions. Geostatistics plays an important role in model-related data analysis and preparation, but has specific limitations when the aquifer system is inhomogeneous. This study combines geostatistics with machine learning approaches to solve problems in complex aquifer systems. Herein, the emphasis is given to cases where the available dataset is large and randomly distributed in the different aquifer types of the hydrogeological system. Self-Organizing Maps can be applied to identify locally similar input data, to substitute the usually uncertain correlation length of the variogram model that estimates the correlated neighborhood, and then by means of Transgaussian Kriging to estimate the bias corrected spatial distribution of groundwater level. The proposed methodology was tested on a large dataset of groundwater level data in a complex hydrogeological area. The obtained results have shown a significant improvement compared to the ones obtained by classical geostatistical approaches.
KW - Box-Cox
KW - Geostatistics
KW - Groundwater
KW - Machine learning
KW - Self-organizing maps
KW - Transgaussian Kriging
UR - http://www.scopus.com/inward/record.url?scp=85153038391&partnerID=8YFLogxK
U2 - 10.1007/s00477-023-02436-x
DO - 10.1007/s00477-023-02436-x
M3 - Article
AN - SCOPUS:85153038391
SN - 1436-3240
VL - 37
SP - 3009
EP - 3020
JO - Stochastic Environmental Research and Risk Assessment
JF - Stochastic Environmental Research and Risk Assessment
IS - 8
ER -