engleski

Impact of rainfall infiltration on groundwater recharge of the deep quaternary aquifer

Verification of recharge of groundwater in the deep quaternary sand layers covered with leaky deposits of silt and clay has been implemented using mathematical modelling of the aquifer system in conditions of test pumping and during a 10 year exploitation of the Osijek well field Vinogradi. An analytical method of identification of local parameters of leaky aquifer is shown using the Excel program that enables usage of data of the relatively short term testing period while at the same time suppressing outer impacts. Boundary conditions and regional aquifer parameters have been verified by numerical aquifer model calibration on balance of three year data of well field functioning, while the average yearly recharge by rainfall infiltration into aquitard deposit of 96 mm annually has been identified by validation of the model on balance of information obtained in observation of groundwater levels in piezometers and in the pumped wells over ten years period. At the end of the validation period there was a 20 month recess in pumping of the entire well field and the measured recovery of groundwater levels provided an additional reality check of the achieved results. Occurrences of divergent variations of the groundwater levels in some layers and in the water quality during exploitation are explained by combined effects of closing of some of the well screens and the heterogeneity of the aquifer system.

Groundwater recharge ; Groundwater modelling ; Leakage ; Aquifer ; Aquitard ; Well field ; Groundwater quality

Glavni autori su: Duić, Željko i Urumović, Kosta