Relationships between stream water chemistry and watershed geology and topography in the Miomote River System, Niigata, Japan

• KOSHIKAWA Masami Kanao

  National Institute for Environmental Studies

• WATANABE Mirai

  National Institute for Environmental Studies

• TAKAMATSU Takejiro

  Ibaraki University

• HAYASHI Seiji

  National Institute for Environmental Studies

• NOHARA Seiichi

  National Institute for Environmental Studies

• SATAKE Kenichi

  Rissho University

Bibliographic Information

Other Title

• 新潟県三面川水系における渓流水質と集水域の地質および地形の関係
• ニイガタケン ミオモテガワ スイケイ ニ オケル ケイリュウ スイシツ ト シュウスイイキ ノ チシツ オヨビ チケイ ノ カンケイ

Abstract

Stream water chemistry was investigated in relation to watershed geology and topography (area, mean elevation, and mean slope) in the Miomote River System, which is comprised of many small watersheds with different geologies and which has been largely unaffected by human activities such as sewage or acid deposition. Representative geologies of the watersheds included Jurassic sediments, granites, acidic tuffs, and andesites. Concentrations of NO₃^-, non-sea-salt (nss-) SO₄^2-, nss-K, nss-Mg, nss-Ca, Si and Al were measured in stream waters from 62 watersheds during baseflow periods. Stream water chemistry under the influence of rain events was also investigated for 31 watersheds. Primary component analysis (PCA) performed on stream water chemistry data extracted two significant factors explaining 57.2 % of the total variance among the watersheds; the first component was related with the fractional area of acidic tuffs, while the second component was related to the mean elevation of watersheds. Factor loadings suggested as follows: nss-K and Al rose and nss-Mg and nss-Ca decreased as the fractional area of acidic tuffs increased, while Si and NO₃^- rose as mean elevation decreased. Variations of nss-K, nss-Mg, and nss-Ca in stream waters seem to reflect the elemental content in bedrocks. An Al variation seems to reflect the variation of Ca acting as a competitive cation for ion exchange and/or complexation. Variations of Si and NO₃^- appear to reflect variations of temperature, soil thickness and water residence time with the mean elevation of watersheds. Under the influence of rain events, concentrations of Si decreased whereas nss-K, Al, NO₃^- increased. It was presumed that Si in stream waters was supplied mainly from the deep soil layer and weathered bedrock, while nss-K, Al, NO₃^- were supplied mainly from the surface soil layer, under the influence of rain events.

Journal

• Japanese Journal of Limnology (Rikusuigaku Zasshi)

  Japanese Journal of Limnology (Rikusuigaku Zasshi) 72 (1), 71-80, 2011

  The Japanese Society of Limnology

Keywords

• stream water chemistry
• watershed geology
• acidic tuffs
• mean elevation
• rain events

Details

• CRID: 1390001204061837952
• NII Article ID: 10029419163
• NII Book ID: AN0024866X
• DOI: 10.3739/rikusui.72.71
• COI: 1:CAS:528:DC%2BC3MXnsl2iu7k%3D
• ISSN: 18824897
• ISSN: 00215104
• NDL BIB ID: 11113723
• Web Site: https://agriknowledge.affrc.go.jp/RN/2030812559
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11113723
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed