Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging
The efficient operation of shallow groundwater (SGW) monitoring networks is crucial to water supply, in-land water protection, agriculture and nature conservation. In the present study, the spatial representativity of such a monitoring network in an area that has been thoroughly impacted by anthropo...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2018-04-01
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| Series: | Open Geosciences |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/geo-2018-0006 |
| _version_ | 1819116113836900352 |
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| author | Trásy Balázs Garamhegyi Tamás Laczkó-Dobos Péter Kovács József Hatvani István Gábor |
| author_facet | Trásy Balázs Garamhegyi Tamás Laczkó-Dobos Péter Kovács József Hatvani István Gábor |
| author_sort | Trásy Balázs |
| collection | DOAJ |
| description | The efficient operation of shallow groundwater (SGW) monitoring networks is crucial to water supply, in-land water protection, agriculture and nature conservation. In the present study, the spatial representativity of such a monitoring network in an area that has been thoroughly impacted by anthropogenic activity (river diversion/damming) is assessed, namely the Szigetköz adjacent to the River Danube. The main aims were to assess the spatial representativity of the SGW monitoring network in different discharge scenarios, and investigate the directional characteristics of this representativity, i.e. establish whether geostatistical anisotropy is present, and investigate how this changes with flooding. After the subtraction of a spatial trend from the time series of 85 shallow groundwater monitoring wells tracking flood events from 2006, 2009 and 2013, variography was conducted on the residuals, and the degree of anisotropy was assessed to explore the spatial autocorrelation structure of the network. Since the raw data proved to be insufficient, an interpolated grid was derived, and the final results were scaled to be representative of the original raw data. It was found that during floods the main direction of the spatial variance of the shallow groundwater monitoring wells alters, from perpendicular to the river to parallel with it for over a period of about two week. However, witht the passing of the flood, this returns to its original orientation in ~2 months. It is likely that this process is related first to the fast removal of clogged riverbed strata by the flood, then to their slower replacement. In addition, the study highlights the importance of assessing the direction of the spatial autocorrelation structure of shallow groundwater monitoring networks, especially if the aim is to derive interpolated maps for the further investigation or modeling of flow. |
| first_indexed | 2024-12-22T05:11:56Z |
| format | Article |
| id | doaj.art-a1d2a051d7534342abe00d99549f7295 |
| institution | Directory Open Access Journal |
| issn | 2391-5447 |
| language | English |
| last_indexed | 2024-12-22T05:11:56Z |
| publishDate | 2018-04-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Open Geosciences |
| spelling | doaj.art-a1d2a051d7534342abe00d99549f72952022-12-21T18:37:58ZengDe GruyterOpen Geosciences2391-54472018-04-01101647810.1515/geo-2018-0006geo-2018-0006Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed cloggingTrásy Balázs0Garamhegyi Tamás1Laczkó-Dobos Péter2Kovács József3Hatvani István Gábor4Department of Physical and Applied Geology, Eötvös Loránd University, BudapestH-1117, HungaryDepartment of Physical and Applied Geology, Eötvös Loránd University, BudapestH-1117, HungaryDepartment of Physical and Applied Geology, Eötvös Loránd University, BudapestH-1117, HungaryDepartment of Physical and Applied Geology, Eötvös Loránd University, BudapestH-1117, HungaryInstitute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, H-1112Budapest, Hungary, Tel.: +36 70317 97 58The efficient operation of shallow groundwater (SGW) monitoring networks is crucial to water supply, in-land water protection, agriculture and nature conservation. In the present study, the spatial representativity of such a monitoring network in an area that has been thoroughly impacted by anthropogenic activity (river diversion/damming) is assessed, namely the Szigetköz adjacent to the River Danube. The main aims were to assess the spatial representativity of the SGW monitoring network in different discharge scenarios, and investigate the directional characteristics of this representativity, i.e. establish whether geostatistical anisotropy is present, and investigate how this changes with flooding. After the subtraction of a spatial trend from the time series of 85 shallow groundwater monitoring wells tracking flood events from 2006, 2009 and 2013, variography was conducted on the residuals, and the degree of anisotropy was assessed to explore the spatial autocorrelation structure of the network. Since the raw data proved to be insufficient, an interpolated grid was derived, and the final results were scaled to be representative of the original raw data. It was found that during floods the main direction of the spatial variance of the shallow groundwater monitoring wells alters, from perpendicular to the river to parallel with it for over a period of about two week. However, witht the passing of the flood, this returns to its original orientation in ~2 months. It is likely that this process is related first to the fast removal of clogged riverbed strata by the flood, then to their slower replacement. In addition, the study highlights the importance of assessing the direction of the spatial autocorrelation structure of shallow groundwater monitoring networks, especially if the aim is to derive interpolated maps for the further investigation or modeling of flow.https://doi.org/10.1515/geo-2018-0006anisotropydirectional variogram analysisfloodsriverbed clogginggroundwater flowriver diversionkrigingrange ellipsegroundwater level monitoring system |
| spellingShingle | Trásy Balázs Garamhegyi Tamás Laczkó-Dobos Péter Kovács József Hatvani István Gábor Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging Open Geosciences anisotropy directional variogram analysis floods riverbed clogging groundwater flow river diversion kriging range ellipse groundwater level monitoring system |
| title | Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging |
| title_full | Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging |
| title_fullStr | Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging |
| title_full_unstemmed | Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging |
| title_short | Geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the Danube River: implications for river bed clogging |
| title_sort | geostatistical screening of flood events in the groundwater levels of the diverted inner delta of the danube river implications for river bed clogging |
| topic | anisotropy directional variogram analysis floods riverbed clogging groundwater flow river diversion kriging range ellipse groundwater level monitoring system |
| url | https://doi.org/10.1515/geo-2018-0006 |
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