scholarly journals Assessing the river water - groundwater interaction and sources of groundwater recharge based on oxygen and hydrogen isotope analyses in the Tedori River Alluvial Fan

2018 ◽  
Vol 60 (2) ◽  
pp. 205-221
Author(s):  
Yumi YOSHIOKA ◽  
Maho ITO ◽  
Kimihito NAKAMURA ◽  
Hiroshi TAKIMOTO ◽  
Takeo TSUCHIHARA
Keyword(s):  
Groundwater Recharge ◽  
River Water ◽  
Hydrogen Isotope ◽  
Alluvial Fan ◽  
Isotope Analyses

Multiple‐indicator study of the response of groundwater recharge sources to highly turbid river water after a landslide in the Tedori River alluvial fan, Japan

2020 ◽  
Vol 34 (16) ◽  
pp. 3539-3554
Author(s):  
Yumi Yoshioka ◽  
Kimihito Nakamura ◽  
Hiroshi Takimoto ◽  
Shinji Sakurai ◽  
Takao Nakagiri ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
River Water ◽  
Alluvial Fan ◽  
Recharge Sources ◽  
Multiple Indicator

Influence of a dual monsoon system and two sources of groundwater recharge on Kofu basin alluvial fans, Japan

2016 ◽  
Vol 48 (4) ◽  
pp. 1071-1087 ◽  
Author(s):  
Takashi Nakamura ◽  
Kei Nishida ◽  
Futaba Kazama
Keyword(s):  
Mass Balance ◽  
Groundwater Recharge ◽  
River Water ◽  
Isotopic Analysis ◽  
Alluvial Fan ◽  
Alluvial Fans ◽  
Recharge Sources ◽  
Balance Analysis ◽  
Monsoon System ◽  
Mass Balance Analysis

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 δ18O 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 d-excess indicates pre-monsoon precipitation contributes 46–68% and 39–65% to groundwater of the Kamanashigawa and Midaigawa alluvial fans, respectively.

scholarly journals Application of a Self-Organizing Map of Isotopic and Chemical Data for the Identification of Groundwater Recharge Sources in Nasunogahara Alluvial Fan, Japan

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 278 ◽  
Author(s):  
Takeo Tsuchihara ◽  
Katsushi Shirahata ◽  
Satoshi Ishida ◽  
Shuhei Yoshimoto
Keyword(s):  
Groundwater Recharge ◽  
Groundwater Resources ◽  
Paddy Rice ◽  
Alluvial Fan ◽  
Rice Fields ◽  
Isotopic Ratios ◽  
Self Organizing Map ◽  
Recharge Sources ◽  
Different Origins ◽  
Self Organizing

Paddy rice fields on an alluvial fan not only use groundwater for irrigation but also play an important role as groundwater recharge sources. In this study, we investigated the spatial distribution of isotopic and hydrochemical compositions of groundwater in the Nasunogahara alluvial fan in Japan and applied a self-organizing map (SOM) to characterize the groundwater. The SOM assisted with the hydrochemical and isotopic interpretation of the groundwater in the fan, and clearly classified the groundwater into four groups reflecting the different origins. Two groundwater groups with lower isotopic ratios of water than the mean precipitation values in the fan were influenced by the infiltration of river water flowing from higher areas in the catchments and were differentiated from each other by their Na+ and Cl− concentrations. A groundwater group with higher isotopic ratios was influenced by the infiltration of paddy irrigation water that had experienced evaporative isotopic enrichment. Groundwater in the fourth group, which was distributed in the upstream area of the fan where dairy farms dominated, showed little influence of recharge waters from paddy rice fields. The findings of this study will contribute to proper management of the groundwater resources in the fan.

The effect of the variation of river water levels on the estimation of groundwater recharge in the Hsinhuwei River, Taiwan

2009 ◽  
Vol 59 (6) ◽  
pp. 1297-1307 ◽  
Author(s):  
Jung-Wei Chen ◽  
Hsun-Huang Hsieh ◽  
Hsin-Fu Yeh ◽  
Cheng-Haw Lee
Keyword(s):  
Groundwater Recharge ◽  
River Water ◽  
Water Levels
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