HR: 0800h
AN: H41C-0655    [Abstracts]
TI: Denitrification of Shallow Groundwater in an Agriculture Area, Korea
AU: * Lee, E
EM: genesislej@hanmail.net
AF: Department of Earth System Sciences, Yonsei University, 134 Sinchon-dong, Seodaemun- gu, Seoul, South Korea, Seoul, 120-749, Korea, Republic of
AU: Woo, N
EM: ncwoo@ysgeo.yonsei.ac.kr
AF: Department of Earth System Sciences, Yonsei University, 134 Sinchon-dong, Seodaemun- gu, Seoul, South Korea, Seoul, 120-749, Korea, Republic of
AU: Lee, S
EM: sdlee@yonsei.ac.kr
AF: Department of Earth System Sciences, Yonsei University, 134 Sinchon-dong, Seodaemun- gu, Seoul, South Korea, Seoul, 120-749, Korea, Republic of
AU: Kim, Y
EM: betty07211004@hotmail.com
AF: Department of Earth System Sciences, Yonsei University, 134 Sinchon-dong, Seodaemun- gu, Seoul, South Korea, Seoul, 120-749, Korea, Republic of
AU: Lee, B
EM: byungsun94@korea.com
AF: Rural Research Institute, Korea Rural Community & Agriculture Corporation, 487, Poildong, Euwang-si, Kyonggi-do, Euwang, 437-703, Korea, Republic of
AU: Lee, M
EM: wlsgml72@hanmail.net
AF: Rural Research Institute, Korea Rural Community & Agriculture Corporation, 487, Poildong, Euwang-si, Kyonggi-do, Euwang, 437-703, Korea, Republic of
AU: Hyun, S
EM: mgodo@ieg.or.kr
AF: Korea Institute of Nuclear Safety, 114, Yuseoung, Daejeon-si, Choochung-do, Daejeon, 305-600, Korea, Republic of
AB: This study was initiated to assess the potentials for nitrate contamination of water supply from the up-gradient agricultural areas. The study site is a small farmland, located in the upper stream of Gwang-gyo reservoir, a water supply source for the Suwon City, Korea. Livestock manure has been used in many of small farmlands as a natural fertilizer in the area. Water levels and quality has been monitored 12 monitoring wells installed into the shallow unconfined aquifer from a since Feb., 2007. Field survey with sampling was conducted in February, April and June representing before, in the beginning of and after the application of fertilizer, respectively. Nitrate levels in groundwater exceeded the Korean Drinking Water Guideline of 10 mg/L of NO₃-N only in April samples of mw12 and mw7 with 10.2 mg/L and 11.2 mg/L, respectively. During that sampling period, much manure was found on the land surface, indicating fertilizer application for farming. However, mw8, only 7-m apart from mw7, showed nitrate level of 1.5 mg/L NO₃-N. The mw8 shows lower DO and higher DOC, HCO₃, and Fe and Mn concentrations than those of mw7, implying more reduced conditions. Consequently, the significant spatial variation in nitrate levels was attributed to the biogeochemical reactions and subsequent denitrification in the shallow aquifer.
DE: 1800 HYDROLOGY
SC: Hydrology [H]
MN: 2007 Fall Meeting