갈수기 지하수 물 사용량 저감 및 기저유출 수질 개선 방안 연구

초록

Based on the current status of groundwater usage in the dry season through field surveys, this study tried to suggest countermeasures to reducegroundwater usage and to improve the water quality of baseflow from agricultural fields. For this purposes, basins with water curtain cultivationpreceded were targeted where decreases of groundwater due to continuous use of groundwater in spring and winter annually observed. From monitoringgroudwater usage of the study watershed, 130,058, 130,105 m3/day of water was pumped in during the water curtain cultivation period(October-February) in the Shindun, Seokwon watershed respectively. And the pilot application of the smart automated sensor-based water curtaincultivation system (smart WC system) developed in this study to reduce groundwater consumption has been conducted. As a result, the efficiency ofthe smart WC system when threshold temperature is set as 6.3 ℃ was 21.1% compared to conventional cultivation and efficiency increased as thresholdtemperature gets lower. Lastly, in this study, culvert drainage and Bio-filters were installed and rainfall monitoring was performed 15 times in orderto analyze the baseflow securement and pollutant loads behavior. As a result, the test-bed with culvert drainage and Bio-filter installed together generated61.4% more baseflow (4.974 m3) than the test-bed with only culvert drainage was installed (3.056 m3). However, the total pollutant load of all waterquality contents (BOD, COD, T-N, TOC) except for the SS and T-P was found to be greater in the culvert drain and Bio-filter installed than in theculvert drain test-bed

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