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Analysis of the Effects of Drainage Systems in Wetlands Based on Changes in Groundwater Level, Soil Moisture Content, and Water Quality
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  • Journal title : The Journal of Engineering Geology
  • Volume 26, Issue 2,  2016, pp.251-260
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2016.2.251
 Title & Authors
Analysis of the Effects of Drainage Systems in Wetlands Based on Changes in Groundwater Level, Soil Moisture Content, and Water Quality
Kim, Chang-Hoon; Ryu, Jeong-Ah; Kim, Deog-Geun; Kim, Gyoo-Bum;
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 Abstract
Groundwater flow due to hydraulic gradients across a geologic barrier surrounding a dam reservoir can cause swamps or wetlands to form on the downstream side of the dam, thereby restricting land use. The difference in head between the reservoir level and the downstream groundwater level creates a hydraulic gradient, allowing water to flow through the geologic barrier. We constructed a drainage system at the Daecheong dam to study the effects on groundwater levels and soil moisture contents. The drainage system consisted of a buried screened pipe spanning a depth of 1-1.5 m below a land surface. Groundwater levels were monitored at several monitoring wells before and after the drainage system was installed. Most well sites recorded a decline in groundwater level on the order of 1 m. The high-elevated site (monitoring well W1) close to the reservoir showed a significant decline in groundwater level of more than 2 m, likely due to rapid discharge by the drainage system. Soil moisture contents were also analyzed and found to have decreased after the installation of the drainage system, even considering standard deviations in the soil moisture contents. We conclude that the drainage system effectively lowered groundwater levels on the downstream side of the dam. Furthermore, we emphasize that water seepage analyses are critical to embankment dam design and construction, especially in areas where downstream land use is of interest.
 Keywords
Geologic barrier;drainage system;groundwater level;soil moisture content;
 Language
Korean
 Cited by
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