Water, Air, and Soil Pollution

, Volume 85, Issue 3, pp 1867–1872 | Cite as

Mechanism of acid-neutralization in two Japanese watersheds

  • Hideshi Ikeda
  • Yoichi Miyanaga
Part VIII Ground Water Acidification and Countermeasures


In Japan, acidification of terrestrial water has not yet been reported except lakes acidified by volcano or mine. However, acid deposition in Japan is as much as those in northern Europe and north-eastern U.S.A., and acidification of terrestrial water may occur in future. In order to predict long-term acidification, it is necessary to understand acid-neutralization mechanism in watershed. Therefore, two experimental watersheds study for geology, hydrology, and water chemistry were conducted. On the basis of these data, chemical change in percolation of precipitation through watersheds and acid-neutralization mechanism are analyzed. The principal results are: (1) Acid deposition is neutralized continuously in percolation of precipitation from ground-surface to aquifer, (2) Chemical weathering of primary minerals plays an important role in the acidneutralization in the watersheds, and should be quantified and taken into account in the long-term prediction of acidification.

Key words

Watershed Japan Chemical weathering Input-output budget 


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Hideshi Ikeda
    • 1
  • Yoichi Miyanaga
    • 1
  1. 1.Environmental Science Department, Abiko Research LaboratoryCentral Research Institute of Electric Power IndustryChibaJapan

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