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Extension variance: an early geostatistical concept applied to assess nitrate pollution in groundwater
- Monitoring and assessing groundwater quality according to European directives and national regulations is usually based on interpolation techniques, e.g. Kriging. However, contour maps of hydrochemical parameters often suggest a spurious local accuracy and can therefore lead to inappropriate action measures. Here, the early concept of extension variance combined with the Voronoi tessellation regionalization is proposed. The mosaic-like representation of pollutant concentrations in Voronoi polygons avoids misinterpretations caused by interpolation. The additional calculation of the extension variance, which is based on fundamental geostatistical assumptions, allows for estimating the probability that a given threshold is exceeded. This concept is further extended to hydraulically delimitable groundwater bodies, thus ensuring that hydraulic boundaries are considered. A method is here described for the assessment of groundwater quality with respect to nitrate concentration in the principal aquifer of the state Mecklenburg-Western Pomerania in Germany.
Author: | Maria-Theresia Schafmeister, Michael Steffen, Karl-Otto Zeissler, Markus Zingelmann |
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URN: | urn:nbn:de:gbv:9-opus-108349 |
DOI: | https://doi.org/10.1007/s10040-023-02666-x |
ISSN: | 1435-0157 |
Parent Title (English): | Hydrogeology Journal |
Publisher: | Springer Nature |
Place of publication: | Berlin |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2023/07/06 |
Date of first Publication: | 2023/09/01 |
Release Date: | 2024/03/07 |
Tag: | EU Water Framework Directive; Geostatistics; Groundwater monitoring; Nitrate; Voronoi tessellation |
Volume: | 31 |
Issue: | 6 |
First Page: | 1463 |
Last Page: | 1473 |
Faculties: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geographie und Geologie |
Collections: | weitere DFG-förderfähige Artikel |
Licence (German): | Creative Commons - Namensnennung 4.0 International |