Identifying the Effects of Groundwater Recharge on Nitrate Concentration in the Eastern Kofu Basin Using 2H, 18O and 15N

DOI Web Site Web Site 7 Citations 50 References
  • NAKAMURA Takashi
    Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • OSADA Yoshimi
    Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • KAZAMA Futaba
    Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi

Bibliographic Information

Other Title
  • 水素・酸素および窒素安定同位体組成からみた甲府盆地東部地下水の涵養源と硝酸イオン濃度分布特性
  • スイソ サンソ オヨビ チッソ アンテイ ドウイタイ ソセイ カラ ミタ コウフ ボンチ トウブ チカスイ ノ カンヨウゲン ト ショウサン イオン ノウド ブンプ トクセイ

Search this article

Abstract

A stable isotopic technique was used to identify the effects of groundwater recharge on nitrate concentration in the alluvial fans of the eastern Kofu basin. Precipitation, groundwater and river water samples were collected from the Fuefukigawa and Hikawa—Kanegawa alluvial fans. The samples were analyzed for nitrate concentration, water δD and δ18O and nitrate δ15N. A wide range of nitrate concentrations was observed in the groundwater of both alluvial fans. The observed δ15N values suggest that the major sources of nitrate are the fertilizers used in orchards. Similarly, the values of δD and δ18O shows that precipitation and river water are the sources of groundwater recharge for both aquifers. Furthermore, a strong positive correlation was observed between nitrate concentration and δ18O values. Nitrate concentration increases with an increase in δ18O value, where lower δ18O values correspond to river water and higher δ18O values correspond to precipitation. It is suggested that precipitation acts as a carrier and river water acts as a diluent in nitrate loading from terrestrial catchments.

Journal

Citations (7)*help

See more

References(50)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top