Stochastic delineation of well capture zones in aquifers of Choushui River alluvial fan in central Taiwan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The delineation of well capture zones is of great importance to accurately define well head protection area (WHPA) for potential groundwater resources and the public security. Natural aquifer systems typically involve different extent of heterogeneity in aquifer parameters and such parameter variations can directly influence the estimations of flow fields and the delineations of WHPAs. This study employs an unconditional approximate spectral method (ASM) associated with backward particle tracking algorithm to delineate stochastic well capture zones in aquifers of Choushui River alluvial fan (CRAF) in central Taiwan. The analysis integrates hourly-recorded groundwater observations from 1995 to 2013 to be the mean flow field. We implement the developed model to 187 Taiwan Water Corporation (TWC) wells for domestic water supplies in CRAF. With predefined small-scale heterogeneity for hydraulic conductivity, the uncertainty of capture zones are obtained based on the observed pumping rates at TWC wells. Results of the analyses show that the average distances of mean capture zones in the first layer of CRAF are about one kilometer from the TWC wells. The small-scale hydraulic conductivity can induce capture zone uncertainties ranging from meters to tens of meters in one year depending on the complexity of the flow field. The uncertainty zones of WHPA in CRAF can be served as the basis to conduct risk analysis for drinking water.

Original languageEnglish
Title of host publicationICCST 2015 - The 49th Annual IEEE International Carnahan Conference on Security Technology
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages427-432
Number of pages6
ISBN (Electronic)9781479986910
DOIs
StatePublished - 21 Jan 2016
Event49th Annual IEEE International Carnahan Conference on Security Technology, ICCST 2015 - Taipei, Taiwan
Duration: 21 Sep 201524 Sep 2015

Publication series

NameProceedings - International Carnahan Conference on Security Technology
Volume2015-January
ISSN (Print)1071-6572

Conference

Conference49th Annual IEEE International Carnahan Conference on Security Technology, ICCST 2015
Country/TerritoryTaiwan
CityTaipei
Period21/09/1524/09/15

Keywords

  • approximate spectral method
  • capture zone
  • Choushui River alluvial fan
  • heterogeneity

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