Institutional Repository
Technical University of Crete
Technical University of Crete
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EL
| URI | http://purl.tuc.gr/dl/dias/612D9363-BEEA-485D-9BE7-097E47485AC9 | - |
| Identifier | https://doi.org/10.1080/02626667.2012.717174 | - |
| Identifier | http://www.tandfonline.com/doi/abs/10.1080/02626667.2012.717174 | - |
| Language | en | - |
| Language | fr | - |
| Extent | 16 pages | en |
| Title | Improving kriging of groundwater level data using nonlinear normalizing transformations—a field application | en |
| Title | Amélioration du krigeage de données piézométriques à l'aide de transformations normalisatrices non-linéaires. Application sur le terrain | fr |
| Creator | Varouchakis Emmanouil | en |
| Creator | Βαρουχακης Εμμανουηλ | el |
| Creator | Christopoulos Dionysios | en |
| Creator | Χριστοπουλος Διονυσιος | el |
| Creator | Karatzas Giorgos | en |
| Creator | Καρατζας Γιωργος | el |
| Publisher | Taylor & Francis | en |
| Description | Δημοσίευση σε επιστημονικό περιοδικό | el |
| Content Summary | The present research study investigates the application of nonlinear normalizing data transformations in conjunction with ordinary kriging (OK) for the accurate prediction of groundwater level spatial variability in a sparsely-gauged basin. We investigate three established normalizing methods, Gaussian anamorphosis, trans-Gaussian kriging and the Box-Cox method to improve the estimation accuracy. The first two are applied for the first time to groundwater level data. All three methods improve the mean absolute prediction error compared to the application of OK to the non-transformed data. In addition, a modified Box-Cox transformation is proposed and applied to normalize the hydraulic heads. The modified Box-Cox transformation in conjunction with OK is found to be the optimal spatial model based on leave-one-out cross-validation. The recently established Spartan semivariogram family provides the optimal model fit to the transformed data. Finally, we present maps of the groundwater level and the kriging variance based on the optimal spatial model. | en |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2015-10-20 | - |
| Date of Publication | 2012 | - |
| Subject | Kriging | en |
| Subject | Gaussian anamorphosis | en |
| Subject | Trans-Gaussian kriging | en |
| Subject | Box-Cox transformation | en |
| Subject | Modified Box-Cox | en |
| Subject | Spartan semivariogram | en |
| Subject | Ungauged basin | en |
| Subject | Groundwater level | en |
| Bibliographic Citation | E. A. Varouchakis, D. T. Hristopoulos and G. P. Karatzas, "Improving kriging of groundwater level data using nonlinear normalizing transformations—a field application," Hydrological Sciences Journal, vol. 57, no. 7, pp. 1404-1419, Sep. 2012. doi: 10.1080/02626667.2012.717174 | en |
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