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KMID : 1024520140230040605
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Journal of the Environmental Sciences
2014 Volume.23 No. 4 p.605 ~ p.613
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Delay Time Estimation of Recharge in the Hancheon Watershed, Jeju Island
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Kim Nam-Won
Na Han-Na
Chung Il-Moon
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Abstract
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In this work, the delay time for groundwater recharge was estimated by comparing simulated recharges by means of
SWAT(Soil and Water Assessment Tool) model and WTF(Water Table Fluctuation) method. The delay time for groundwater
recharge means that the time when the water from rainfall travelled through vadose zone just after getting out of soil zone
bottom. As measuring this delay time is almost impossible, we used to compare the estimated values from modeling(SWAT) and analytic method(WTF). The test site is Hancheon watershed which has 8 groundwater measurement stations. The results show that the altitude has a linear relationship with the estimated delay time values. To validate these results, we conducted corelation analysis between transformed groundwater levels and observed ones. The results showed that computed groundwater levels have good corelation(R2=0.97, 0.87, respectively). The estimated delay time would be used for the groundwater behaviour characteristics in vadose zone. As recharge rates vary according to the height, the delay time is thought to be an import variable for the proper groundwater recharge estimation.
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KEYWORD
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Recharge, Water table fluctuation method, Vadose zone, Delay time
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