2003 Fiscal Year Final Research Report Summary
Analysis of hydrological cycle in atmosphere using hydrogen and oxygen stable isotope ratios
| Project/Area Number |
13838008
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
水循環システム
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| Research Institution | Wakayama University |
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Principal Investigator |
HIRATA Tatemasa Wakayama University, Department of Environmental Systems, Professor, システム工学部, 教授 (30093454)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIZUKA Masahide Wakayama University, Department of Environmental Systems, Research Associate, システム工学部, 助手 (50324992)
EGUSA Nobuyuki Wakayama University, Department of Environmental Systems, Associate Professor, システム工学部, 助教授 (00283961)
II Hiroyuki Wakayama University, Department of Environmental Systems, Professor, システム工学部, 教授 (60283959)
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| Project Period (FY) |
2001 – 2003
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| Keywords | oxygen isotope / hydrogen isotope / rainfall system / Kii peninsula / rain water / stream water / water vapor / isotope fractionation |
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| Research Abstract |
We measured oxygen stable isotope ratios (δ ^<18>O) of surface water in Kii Peninsula, and showed their spatial distribution. As a result, the enriched δ ^<18>O composition of surface waters were distributed in the southeast area and the depleted δ ^<18>O composition of surface waters were distributed in the inland area where the altitude was high (>1000 m). In order to understand the spatial distribution of δ ^<18>O composition of surface water, rainfall characteristics were considered as well as topographic effect. We classified the rainfall characteristics with three zones using a ratio of the total number that means how many times precipitation was simultaneously observed between AMeDAS observation stations: 1)the east and southeast area (zone A), 2)the southwest area (zone B), 3)the northwest area (zone C). From the correlation analysis between δ ^<18>O and topographic data, we can find that the zoning effects on the topographic effect, especially in a meso-scale area. Our observation result shows that the δ ^<18>O composition of surface water was enriched in high precipitation area. This result does not correspond to the isotopic amount effect. We think this reasons that continuous vapor supply from the sea keeps δ ^<18>O composition of rain clouds enriched.
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[Publications] Yamanao, K., Ii, H., Hirata, T., Ishizuka, M.: "New index to determine origin of nitrogen in groundwater using concentrations of SO42-, Cl-, NO2-, NO3-, and NH4+, 1st International Conference on 2003"Groundwater in Geological Engineering. (in press).
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[Publications] Ii, H., Yamanao, K., Hirata, T., Tanaka, T., Nishikawa, M.: "Nitrogen contamination from fertilizer in tea planataion, Kiku River basin, Japan"Groundwater Engineering(A.A.Balkema Publisher). 335-341 (2003)
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[Publications] Tanaka, T., Ii, H., Hirata, T., Nishikawa, M., Umehara, K., Ogawa, Y.: "Groundwater metal and nitrogen contaminations caused by nitrogen fertilizer in tea plantation catchment, the center of Shizuoka, Japan"Journal of hydroscience and hydraulic Engineering. Vol.20(1). 37-47 (2002)
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