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首页> 外文期刊>Nordic hydrology >Influence of a dual monsoon system and two sources of groundwater recharge on Kofu basin alluvial fans, Japan
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Influence of a dual monsoon system and two sources of groundwater recharge on Kofu basin alluvial fans, Japan

机译：双季风系统和两个地下水补给源对日本甲府盆地冲积扇的影响

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摘要

This study investigates the contribution ratios of different groundwater recharge sources and influence of a dual monsoon system in Kofu basin, central Japan, through the hydrogen and oxygen isotopic analysis of precipitation, river water, and groundwater. The study is focused on the area of the Kamanashigawa and Midaigawa alluvial fans, which are formed by two main rivers. Precipitation isotopic content exhibits significant seasonal variability. Also, river water presents d-excess values higher than annual precipitation at plain areas (9 and 10‰), suggesting that two different air-masses contribute to precipitation, corresponding to the monsoon and pre-monsoon periods. The results of this study allow estimation of relative contributions of different sources to groundwater and influence of a dual monsoon system. The mass-balance analysis of the δ~(18)O to identify the groundwater source indicates the river water contributes 38-100% of the recharge, while precipitation contributes 29-62% in Kamanashigawa alluvial fan. In the case of Midaigawa alluvial fan, river water contributes 77-99% in the northern part; in the southern side, 30-93% of contribution comes from precipitation. The mass-balance analysis of the of-excess indicates pre-monsoon precipitation contributes 46-68% and 39-65% to groundwater of the Kamanashigawa and Midaigawa alluvial fans, respectively.
机译：本研究通过对降水，河水和地下水的氢和氧同位素分析，研究了日本中部甲府盆地不同地下水补给源的贡献率和双重季风系统的影响。这项研究的重点是由两条主要河流形成的河梨川和御堂川冲积扇地区。降水同位素含量表现出明显的季节性变化。同样，河水的d超额值高于平原地区的年降水量（9和10‰），这表明对应于季风和季风前期，两种不同的空气质量促成降水。这项研究的结果可以估算不同来源对地下水的相对贡献以及双季风系统的影响。对δ〜（18）O进行质量平衡分析以识别地下水源，表明河水占补给量的38-100％，而降水在Kamanashigawa冲积扇中占29-62％。以Midaigawa冲积扇为例，北部的河水占77-99％。在南部，贡献的30-93％来自降水。过量物质的质量平衡分析表明，季风前降水分别对Ka梨川和冲绳川冲积扇的地下水贡献了46-68％和39-65％。

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  • 来源
    《Nordic hydrology》 |2017年第4期|1071-1087|共17页
  • 作者

    Takashi Nakamura; Kei Nishida; Futaba Kazama;

  • 作者单位

    Interdisciplinary Center for River Basin Environment University of Yamanashi,4-3-11 Takeda,Kofu Yamanashi 400-8510,Japan;

    Interdisciplinary Center for River Basin Environment University of Yamanashi,4-3-11 Takeda,Kofu Yamanashi 400-8510,Japan;

    Interdisciplinary Center for River Basin Environment University of Yamanashi,4-3-11 Takeda,Kofu Yamanashi 400-8510,Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    alluvial fan; d-excess values; groundwater; hydrogen and oxygen isotopes of water; monsoon system;

    机译：冲积扇d-超值;地下水;水的氢氧同位素季风系统;

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