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Using GPR on a Problematic Agricultural Field for Groundwater Protection in a Karst EnvironmentNormal access

Authors: M. Zajc and J. Urbanc
Event name: 10th International Workshop on Advanced Ground Penetrating Radar
Session: Hydrogeophysics
Publication date: 09 September 2019
DOI: 10.3997/2214-4609.201902563
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.16Mb )
Price: € 20

Summary:
Due to the extreme heterogeneity and increasing importance of karst aquifers as water supply sources and their often inadequate protection strategies, the knowledge of subsurface conditions in such areas is vital for the accurate groundwater vulnerability assessments. The presence of agricultural activity can increase the risk of groundwater pollution, therefore a GPR study was conducted on a problematic agricultural field within a karst aquifer. The results gave critical information regarding groundwater vulnerability assessment. The thickness of the top soil and weathered zone was more accurately determined with the 500 MHz antenna, however discontinuities within the limestone were more pronounced with the 250 MHz antenna. Both antennas gave comparable results regarding point anomalies, which probably represent karst features. As the results show both lateral and vertical changes in the subsurface, GPR could also be used in precision agriculture as well as irrigation planning and optimization where soil moisture surveys must first be conducted. GPR results could be used to position the soil moisture tracking probes in representative locations along the agricultural field. By conducting comprehensive studies of agricultural areas within karst aquifers we could contribute to a more precise assessment of groundwater vulnerability and a more sustainable food production.


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