Artificial recharge efficiency assessment by soil water balance and modelling approaches in a multi-layered vadose zone in a dry region |
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| Authors: | Mojtaba Pakparvar Hossein Hashemi Meisam Rezaei Wim M Cornelis Gholamali Nekooeian Sayyed Ahang Kowsar |
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| Institution: | 1. Soil Conservation and Watershed Management Research Department, Fars Agricultural and Natural Resources Research and Education Center, AREEO, Shiraz, Iran;2. Center for Middle Eastern Studies and Department of Water Resources Engineering, Lund University, Lund, Sweden;3. Soil Management Department, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium;4. Soil and Water Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran |
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| Abstract: | To assess recharge through floodwater spreading, three wells, approx. 30 m deep, were dug in a 35-year-old basin in southern Iran. Hydraulic parameters of the layers were measured. One well was equipped with pre-calibrated time domain reflectometry (TDR) sensors. The soil moisture was measured continuously before and after events. Rainfall, ponding depth and the duration of the flooding events were also measured. Recharge was assessed by the soil water balance method, and by calibrated (inverse solution) HYDRUS-1D. The results show that the 15 wetting front was interrupted at a layer with fine soil accumulation over a coarse layer at the depth of approx. 4 m. This seemed to occur due to fingering flow. Estimation of recharge by the soil water balance and modelling approaches showed a downward water flux of 55 and 57% of impounded floodwater, respectively. |
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| Keywords: | soil water balance floodwater spreading HYDRUS fingering movement artificial recharge |
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