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KMID : 0363420160300030042
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Journal of Korean Oriental Pediatrics
2016 Volume.30 No. 3 p.42 ~ p.51
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Analysis of Groundwater Use and Discharge in Water Curtain Cultivation Areas: Case Study of the Cheongweon and Chungju Areas
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Moon Sang-Ho
Ha Kyoo-Chul
Kim Yong-Cheol
Yoon Pil-Sun
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Abstract
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Korean agricultural areas that employ water curtain cultivation (WCC) have recently suffered extensive groundwater shortages due to an increase in the number of facilities. The primary focus of this study is to measure the daily groundwater use and discharge rates in the Cheongweon and Chungju pilot areas, while the second focus is to estimate the total amount of groundwater used in WCC areas nationwide in Korea. Taking into consideration several factors, including motor type, outflow abilities of wells, records of daily minimum temperatures below 0oC, and the number of running wells according to weather variations, we estimated that 53,138 m3/ha of groundwater had been used in the 4-hectare Cheongweon pilot area during the winter period of late 2011 through early 2012. On a prorated areal basis, we can calculate that the total groundwater used nationwide was 0.57 billion m3 in WCC areas of 10,746 m2. This value is quivalent to 33.7% of the total agricultural groundwater use (1.69 billion m3) in Korea. During 9-22 February 2012, the daily water discharge rate in the 4-ha Cheongweon pilot area ranged from 2,079 to 2,628 m3, averaging 2,341 m3. Combining this value with meteorological records for 94 days with a daily minimum temperature below 0oC results in an estimated groundwater volume of 54,990 m3/ha for the pilot area during the 2011-2012 winter period. The total amount of groundwater used nationwide in WCC areas would then be 0.59 billion m3, equivalent to 34.9% of the total agricultural groundwater use in Korea. In the Chungju area, the groundwater discharge rate was estimated to be less than 805 m3/ha. This value, combined with weather data for 108 days with a daily minimum temperature below 0oC in this area, can be applied to infer that the total groundwater volume used in WCC areas nationwide is no more than 55% of the total agricultural groundwater use in Korea.
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KEYWORD
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Cheongweon, Chungju, water curtain cultivation, groundwater use and discharge, daily minimum temperature
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