Monitoring groundwater variation by satellite and implications for in-situ gravity measurements

Yoichi Fukuda, Keiko Yamamoto, Takashi Hasegawa, Toshiyuki Nakaegawa, Jun Nishijima, Makoto Taniguchi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


In order to establish a new technique for monitoring groundwater variations in urban areas, the applicability of precise in-situ gravity measurements and extremely high precision satellite gravity data via GRACE (Gravity Recovery and Climate Experiment) was tested. Using the GRACE data, regional scale water mass variations in four major river basins of the Indochina Peninsula were estimated. The estimated variations were compared with Soil-Vegetation-Atmosphere Transfer Scheme (SVATS) models with a river flow model of 1) globally uniform river velocity, 2) river velocity tuned by each river basin, 3) globally uniform river velocity considering groundwater storage, and 4) river velocity tuned by each river basin considering groundwater storage. Model 3) attained the best fit to the GRACE data, and the model 4) yielded almost the same values. This implies that the groundwater plays an important role in estimating the variation of total terrestrial storage. It also indicates that tuning river velocity, which is based on the in-situ measurements, needs further investigations in combination with the GRACE data. The relationships among GRACE data, SVATS models, and in-situ measurements were also discussed briefly.

Original languageEnglish
Pages (from-to)3173-3180
Number of pages8
JournalScience of the Total Environment
Issue number9
Publication statusPublished - Apr 15 2009

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution


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