Presentation Information
[AHW24-P03]Effects of mountainous water recharge to groundwater quality of alluvial fan
*Takashi NAKAMURA1, Kei NISHIDA1, Futaba KAZAMA1 (1.ICRE, University of Yamanashi)
Keywords:
Groundwater recharge,Alluvial fan,Isotopes,End-member mixing analysis,Mountainous water resource
In this study, the hydrogen and oxygen stable isotopes (dD and d18O) and chemical compositions of environmental water were employed to identify the effects of mountainous water recharge for groundwater quality on alluvial fan.
The study area is Midaigawa alluvial fan, located in western Kofu basin on central Japan, which is formed by Raised-bed River discharged from the mountain watershed.
The groundwater samples were collected from 25 deep wells (100~300m) in June-2010, Novenber-2011 and Novenber-2012. Those wells were located on Midaigawa alluvial fan and adjacent mountain. Four End-member mixing analysis using isotope value and chemical compositions revealed spatial variation in the contribution ratios for various groundwater sources. This presentation focused on groundwater recharge from mountain area to alluvial fan. It also found the relationship between contributions of mountainous water on groundwater and chemical composition.
Acknowledgment
This study was supported by the Kurita water and environment Foundation (No.14B063).
The study area is Midaigawa alluvial fan, located in western Kofu basin on central Japan, which is formed by Raised-bed River discharged from the mountain watershed.
The groundwater samples were collected from 25 deep wells (100~300m) in June-2010, Novenber-2011 and Novenber-2012. Those wells were located on Midaigawa alluvial fan and adjacent mountain. Four End-member mixing analysis using isotope value and chemical compositions revealed spatial variation in the contribution ratios for various groundwater sources. This presentation focused on groundwater recharge from mountain area to alluvial fan. It also found the relationship between contributions of mountainous water on groundwater and chemical composition.
Acknowledgment
This study was supported by the Kurita water and environment Foundation (No.14B063).