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Time-series analysis of three years of groundwater level data (Seoul, South Korea) to characterize urban groundwater recharge

Gi-Tak Chae, Seong-Taek Yun, Dong-Seung Kim, Kyoung-Ho Kim and Yongsung Joo
Time-series analysis of three years of groundwater level data (Seoul, South Korea) to characterize urban groundwater recharge
Quarterly Journal of Engineering Geology and Hydrogeology (February 2010) 43 (1): 117-127

Abstract

A time-series analysis was performed on 3 years of daily groundwater level data from 34 monitoring wells in the bedrock aquifer of Seoul to understand the characteristics of groundwater recharge in an urban setting and thereby provide a policy background for sustainable groundwater management. The cross-correlation function was used to estimate the lag time of groundwater level change after a rainfall event. Based on the lag time, monitored wells are classified into two groups. The delay was very short (1-7 days) in Group I wells (n=12), whereas Group II wells (n=22) showed a longer delay (17-58 days). Such variable response was considered to reflect differences in the transmission of hydraulic pressure induced by recharging rainwater through the unsaturated zone. The estimated delay time showed significant correlation with the elevation, depth to groundwater level, and thickness of soil (or alluvium). The shorter delay Group I wells generally had shallower groundwater levels and were preferentially located toward mountainous areas. Group I wells also tended to be located in areas with thinner soil (or alluvium) cover. However, ground cover characteristics (e.g. pavement) around wells had no correlation with the delay time. The characteristics of groundwater recharge in this urban setting therefore appear to be controlled by natural conditions such as topography and soil thickness, rather than by land use. The study suggests that natural conditions should be more carefully considered in the designation of Groundwater Preservation Areas.


ISSN: 1470-9236
EISSN: 2041-4803
Serial Title: Quarterly Journal of Engineering Geology and Hydrogeology
Serial Volume: 43
Serial Issue: 1
Title: Time-series analysis of three years of groundwater level data (Seoul, South Korea) to characterize urban groundwater recharge
Affiliation: Korea University, Department of Earth and Environmental Sciences, Seoul, South Korea
Pages: 117-127
Published: 201002
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 24
Accession Number: 2010-029005
Categories: HydrogeologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch maps
N37°25'32" - N37°41'55", E126°45'55" - E127°11'06"
Secondary Affiliation: Dongguk University, KOR, South Korea
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201017
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