| Project/Area Number |
13838008
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
水循環システム
|
|---|
| Research Institution | Wakayama University |
|---|
Principal Investigator |
HIRATA Tatemasa Wakayama University, Department of Environmental Systems, Professor, システム工学部, 教授 (30093454)
|
|---|
| 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)
|
|---|
| Project Period (FY) |
2001 – 2003
|
| Project Status |
Completed (Fiscal Year 2003)
|
| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
|
|---|
| Keywords | oxygen isotope / hydrogen isotope / rainfall system / Kii peninsula / rain water / stream water / water vapor / isotope fractionation / 水循環システム / 水素同位体比 / 酸素同位体比 / 蒸発速度 |
|---|
| 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.
|
