Multiple geophysical surveys for old landfill monitoring in Singapore

Ke Yin, Huanhuan Tong, Apostolos Giannis, Jing Yuan Wang, Victor W.-C. Chang

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1 Citation (Scopus)

Abstract

One-dimensional boring presents limitations on mapping the refuse profile in old landfills owning to waste heterogeneity. Electrical imaging (EI) and multiple-analysis of surface wave (MASW) were hereby deployed at an old dumping ground in Singapore to explore the subsurface in relation to geotechnical analysis. MASW estimated the refuse boundary with a higher precision as compared to EI, due to its endurance for moisture variation. EI and MASW transection profiles suggested spots of interest, e.g., refuse pockets and leachate mounds. 3D inversion of EI and MASW data further illustrated the transformation dynamics derived by natural attenuation, for instance the preferential infiltration pathway. Comparison of geophysical surveys at different years uncovered the subterranean landfill conditions, indicating strong impacts induced by aging, precipitation, and settlement. This study may shed light on a characterization framework of old landfills via combined geophysical models, thriving landfill knowledge with a higher creditability.

Original languageEnglish
Article number20
JournalEnvironmental Monitoring and Assessment
Volume189
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017
Externally publishedYes

Keywords

  • EI
  • Geophysical method
  • Geotechnical analysis
  • Landfill monitoring
  • MASW

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