GIS and SBF for estimating groundwater recharge of a mountainous basin in the Wu River watershed, Taiwan

Hsin Fu Yeh, Hung I. Lin, Shing Tsz Lee, Min Hsiang Chang, Kuo Chin Hsu, Cheng Haw Lee

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The temporal and spatial distributions of precipitation are extremely uneven; so, careful management of water resources in Taiwan is crucial. The long-term overexploitation of groundwater resources poses a challenge to water resource management in Taiwan. However, assessing groundwater resources in mountainous basins is challenging due to limited information. In this study, a geographic information system (GIS) and stable base-flow (SBF) techniques were used to assess the characteristics of groundwater recharge considering the Wu River watershed in central Taiwan as a study area. First, a GIS approach was used to integrate five contributing factors: lithology, land cover/land use, lineaments, drainage, and slope. The weights of factors contributing to the groundwater recharge were obtained from aerial photos, geological maps, a land use database, and field verification. Second, the SBF was used to estimate the groundwater recharge in a mountainous basin scale. The concept of the SBF technique was to separate the base-flow from the total streamflow discharge in order to obtain a measure of groundwater recharge. The SBF technique has the advantage of integrating groundwater recharge across an entire basin without complex hydro-geologic modelling and detailed knowledge of the soil characteristics. In this study, our approach for estimating recharge provides not only an estimate of how much water becomes groundwater, but also explains the characteristics of a potential groundwater recharge zone.

Original languageEnglish
Pages (from-to)503-516
Number of pages14
JournalJournal of Earth System Science
Volume123
Issue number3
DOIs
Publication statusPublished - 2014 Apr

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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