HR: 0800h
AN: H21B-1008    [Abstracts]
TI: Groundwater System Investigation of the Cheonggyecheon Watershed Area
AU: * Choi, D
EM: giaboss@hanmail.net
AF: Seoul National Univ., School of Earth and Environmental Sciences, Seoul, 151-747 Korea, Republic of
AU: Lee, K
EM: kklee@snu.ac.kr
AF: Seoul National Univ., School of Earth and Environmental Sciences, Seoul, 151-747 Korea, Republic of
AU: Hyun, Y
EM: yjhyun@snu.ac.kr
AF: Seoul National Univ., School of Earth and Environmental Sciences, Seoul, 151-747 Korea, Republic of
AU: Kim, Y
EM: yykim@cau.ac.kr
AF: Chung-Ang, Research Institude and Industrial Management, Seoul, 456-756 Korea, Republic of
AB: The Cheonggyecheon is an urban stream in the center of the Seoul, Korea. Because of fundamental solution of the deterioration on covering structure and expressway, the Seoul Metropolis decided 'Cheonggyecheon restoration' and began on July 1, 2003. The purpose of the Cheonggyecheon restoration is a plan for the afforestation in Seoul, but the Cheonggyecheon needs more water for the maintenance of flow. The Cheonggyecheon is a disconnected stream because of a urban stream which has many influenced factors such as pumping out, groundwater leakages into subway stations and leaking water from water supply and sewage line. So, the objectives of this study are analyzing influenced factors in the groundwater budget in the Cheonggyecheon watershed and suggesting the amount of input and output water. There are many factors influenced by the infiltration in this study area such as a flow rate of the stream, a thickness of the stream bed, a grain size of the stream bed, and a permeability of a waterproof material after restoration. For investigation of the hydrogeologic parameter in the study area, we perform the hydraulic tests; pumping test, slug test, and infiltration test. Groundwater quality data were collected for an investigation of the origin of groundwater in the study area and the index parameter after restoration. For estimating a level of sensitive factors after restoration construction, we conduct sand tank test and numerical test. In comparison of the results of the sand tank test and the numerical test, we decide the prime control factor of infiltration water in the Cheonggyecheon watershed, and suggest the amount of water budget in this study site.
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1860 Runoff and streamflow
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting