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Variation Characteristics of Hydraulic Gradient and Major Flow Direction in the Landfill Soils

매립지 토양층의 수리경사와 주 흐름 방향의 변동특성

  • Kim, Tae-Yeong (GeoGreen21 Co., Ltd) ;
  • Kang, Dong-Hwan (Department of Environmental Geosciences, Pukyong National University) ;
  • Kim, Sung-Soo (Department of Environmental Geosciences, Pukyong National University) ;
  • Kwon, Byung-Hyuk (Department of Environmental Atmospheric Sciences, Pukyong National University)
  • 김태영 ((주)지오그린21) ;
  • 강동환 (부경대학교 환경지질과학과) ;
  • 김성수 (부경대학교 환경지질과학과) ;
  • 권병혁 (부경대학교 환경대기과학과)
  • Published : 2009.03.31

Abstract

Hydraulic gradient of the landfill soils is estimated by Devlin (2003) method, and its variation characteristics from rainfall and permeability of the aquifer material are analyzed. The study site of 18 m $\times$ 12 m is located in front of the Environment Research Center at the Pukyong National University, and core logging, slug/bail test and groundwater monitoring was performed. The sluglbail tests were performed in 9 wells (except BH9 well), and drawdown data with elapsed time for bail tests were analyzed using Bouwer-Rice and Hvorslev methods. The average hydraulic conductivity estimated in each of the test wells was ranged $1.991{\times}10^{-7}{\sim}4.714{\times}10^{-6}m/sec$, and the average hydraulic conductivity in the study site was estimated $2.376{\times}10^{-6}m/sec$ for arithmetic average, $1.655{\times}10^{-6}m/sec$ for geometric average and $9.366{\times}10^{-7}m/sec$ for harmonic average. The permeability of landfill soils was higher at the east side of the study site than at the west side. Groundwater level in 10 wells was monitored 44 times from October 2 to November 7, 2007. The groundwater level was ranged 1.187$\sim$1.610 m, and the average groundwater level range in each of the well showed 1.256$\sim$1.407 m. The groundwater level was higher at the east side than at the west side of the study site, and this distribution is identify to it of hydraulic conductivity. The hydraulie gradient and the major flow direction for 10 wells were estimated 0.0072$\sim$0.0093 and $81.7618{\sim}88.0836^{\circ}$, respectively. Also, the hydraulic gradient and the major flow direction for 9 wells were estimated 0.0102$\sim$0.0124 and $84.6822{\sim}89.1174^{\circ}$, respectively. The hydraulic gradient of the study site increased from rainfall (83.5 mm) on October 7, causing by that the groundwater level of the site with high permeability was higher. The hydraulic gradient estimated on and after October 16 was stable, due to almost no rainfall. Thus, it was confirmed that the variation of the hydraulic gradient in the landfill soils was controlled by the rainfall.

Keywords

Landfill soils;Hydraulic conductivity;Groundwater level;Rainfall;Hydraulic gradient;Major flow direction

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