Contribution of precipitation to groundwater flow systems in three major alluvial fans in Toyama Prefecture, Japan: stable-isotope characterization and application to the use of groundwater for urban heat exchangers

Okakita, Nagisa; Iwatake, Kaname; Hirata, Hiromichi; Ueda, Akira

doi:10.1007/s10040-018-1850-y

Cited by 16 publications

(19 citation statements)

References 40 publications

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“…Craig, 1961;Dansgaard, 1964) in precipitation, and it has been reported that d values varied continuously from about 10‰ in summer to 30‰ in winter with an average of 15.7‰ in this region. This d value has been observed intermittently since 1982 and uctuates in the range of 10.0 − 26.6‰ (Okakita et al, 2019).…”

Section: Seasonal Variation Of Groundwater Ecmentioning

confidence: 86%

“…1b, Table 3). Within this region, Okakita et al (2019) measured precipitation at two observation stations (P1 and P2 in Fig. 1b) every month in the same time frame as this study (May 2012 to May 2014), and their data were used in this study.…”

Section: Sample Locality and Analytical Proceduresmentioning

confidence: 99%

“…There are two precipitation observation sites in the study area, and EC values of precipitation were below 6 mS/m throughout the year. EC values tend to increase in winter (Okakita et al, 2019), when precipitation mainly comes from air masses originating in mainland China. Winter precipitation is more acidic, and rich in SO 4 2− than precipitation in summer (Okakita et al, 2019).…”

Section: Seasonal Variation Of Groundwater Ecmentioning

confidence: 99%

“…EC values tend to increase in winter (Okakita et al, 2019), when precipitation mainly comes from air masses originating in mainland China. Winter precipitation is more acidic, and rich in SO 4 2− than precipitation in summer (Okakita et al, 2019). The EC value of river water is higher than that of precipitation and also tends to rise slightly in winter (Fig.…”

Section: Seasonal Variation Of Groundwater Ecmentioning

confidence: 99%

“…The δ 18 O values for precipitation and river water were set as − 9.0‰ and − 10.7‰, respectively, which are the annual weighted averages (Okakita et al, 2019) at observation site P1 (Fig. 1b) and for Sho River water in this study, respectively (Table 3).…”

Section: Seasonal Variationmentioning

confidence: 99%

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Flow analysis of groundwater with seasonal variation of temperature, electric conductivity, and oxygen isotope for heat utilization in Sho River alluvial fan, Toyama, Japan

Iwatake

Ueda

2021

Preprint

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Seasonal variation of water temperature, electric conductivity, and oxygen isotope composition was determined in the Sho River alluvial fan, western Toyama Prefecture, to examine groundwater heat utilization for indoor climate control. Samples were collected at 31 sites every 2 months for 1 year and at 11 representative sites monthly. The groundwater sources are a mixture of river water and precipitation. The contribution of precipitation to groundwater is generally small along the Sho River but reaches as much as 80% along the Oyabe River and in the south and west of the alluvial fan. Though the origin of the groundwater differs regionally, water temperature is fixed at about 15°C throughout the year in the northern part of the alluvial fan, and open ground source heat pump systems can be used for cooling and heating there.

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Section: Seasonal Variation Of Groundwater Ecmentioning

confidence: 86%

Section: Sample Locality and Analytical Proceduresmentioning

confidence: 99%