Naslov
Building the 2D water flow model in the unsaturated zone of Zagreb aquifer in order to quantify aquifer recharge from precipitation

Autori
Bačani, Laura ; Posavec, Kristijan ; Čenčur Curk, Barbara

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Making groundwater in the Danube region visible / Brenčić, Mihael ; Torkar, Anja ; Žvab Rožić, Petra - Ljubljana : Slovenian Committee of International Association of Hydrogelogist - SKIAH, 2022, 15-15

ISBN
978-961-95960-0-5

Skup
5th IAH CEG Conference "Making groundwater in the Danube Region visible"

Mjesto i datum
Rogaška Slatina, Slovenija, 05.10.2022. - 07.10.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
unsaturated flow model, research polygon, precipitation infiltration, groundwater recharge, Zagreb aquifer

Sažetak
The Zagreb aquifer represents the only source of drinking water for the capital of Croatia and is a strategic groundwater resource within the Croatian Waters’ Water Management Strategy. Since a decline in groundwater level has been observed in recent decades (Vujević and Posavec, 2018), it became important to investigate and understand all sources of aquifer recharge. In order to identify and quantify recharge from precipitation, a research polygon was established in the southern part of the Zagreb aquifer at Velika Gorica well field, consisting of a research shaft in the unsaturated zone and a meteorological station. The shaft is equipped with TDR probes and tensiometers that continuously measure soil water content, electrical conductivity and matric potential, and is therefore suitable for the study of precipitation infiltration processes in the unsaturated zone. The electrical resistivity tomography method was performed on the soil surface adjacent to the shaft to obtain the distribution of electrical resistivity values. The area of the unsaturated flow model is 3 m wide and 3 m deep and is divided in 14 layers according to geophysical survey results. Precipitation represents the model inflow, whereas evapotranspiration and water seepage at the bottom boundary represent the model outflow. The lateral model boundaries are presumed to be impermeable. Initial conditions, i.e., initial moisture content values in the model domain are obtained using a MoisturEC program (Terry et al., 2018). Finally, the parameters of the unsaturated zone, i.e., soil water retention curves will be obtained in model calibration process that adjusts sediment parameters in all layers of the model until numerical water contents match measured water contents. Numerical simulation of water flow in the unsaturated zone will be performed using the program HYDRUS 2D. Knowing the exact amount of aquifer recharge due to precipitation can improve the existing regional numerical groundwater flow models and thus contribute to sustainable water management.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Geofizika, Rudarstvo, nafta i geološko inženjerstvo, Interdisciplinarne tehničke znanosti

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