Abstract
The article discusses methodical aspects of groundwater recharge estimation using water table fluctuation analysis method (WTF-method). The analysis operates data set of automated monitoring of water table, meteorological parameters, water content and suction pressure in sandy unsaturated zone soil profile of experimental site of IGS NASU situated in Chernobyl exclusion zone in «Red Forest» waste damp area. Improved procedure (in comparison with the standard version of WTF-method) for estimation of water table recession rate, which is one of the key parameters of recharge estimation, is proposed. Also a method for quantification of specific yield of unsaturated zone soils is described. This method is based on analysis of correlation coefficients between amount of precipitations and corresponding integral (taking to account recession) water table rise. Methods were used for quantification of groundwater recharge at experimental site in Chernobyl «Red Forest» for the 2000-2012years period. The estimated specific yield coefficient for local sandy soils is µ≈0.11. Obtained average value of annual recharge is 295mm/year (210439mm/year for different years) or 47% (37-62%) of precipitation amount. Thecalculated values of groundwater recharge are in good agreement with estimates obtained using other methods.
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