A viscoelastic model for groundwater level changes in the Cho-Shui River alluvial fan after the Chi-Chi earthquake in Taiwan

Yun Bin Lin, Yih Chi Tan, Tian Chyi Jim Yeh, Chen Wuing Liu, Chu Hui Chen

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

A viscoelastic model is developed to simulate the groundwater level changes in the Cho-Shui River alluvial fan in Taiwan after the Chi-Chi earthquake. An analytical solution is derived with the assumption that no leakage occurred in confined aquifers during the coseismic period. The solution is used to analyze the data collected from a high-density network of hydrologic monitoring wells in the Cho-Shui River alluvial fan. The simulated groundwater level changes agree with the observations. The viscosity coefficient of the model was found to correlate with the hydraulic conductivity of the aquifer. The field observations and the simulations reveal the influence of geological structures and heterogeneity on the groundwater changes and locations of sediment liquefactions in the alluvial fan during the Chi-Chi earthquake. Possible applications to imaging subsurface hydraulic heterogeneity are discussed using information about groundwater level changes induced by earthquakes.

Original languageEnglish (US)
Pages (from-to)W042131-W0421312
JournalWater Resources Research
Volume40
Issue number4
DOIs
StatePublished - Apr 2004

Keywords

  • Chi-Chi earthquake
  • Delineation
  • Groundwater level changes in wells
  • Sand/gravel formation
  • Viscoelastic model

ASJC Scopus subject areas

  • Water Science and Technology

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