1992 Fiscal Year Final Research Report Summary
HYDROLOGICAL AND EROSIONAL ENVIRONMENT INFERRED FROM CHANGES IN TREE RING WIDTH AND GRAIN-SIZE OF POND SEDIMENT
| Project/Area Number |
03640384
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
気象・海洋・陸水学
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| Research Institution | Kobe University |
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Principal Investigator |
KASHIWAYA Kenji The Graduate School of Science and Technology, Kobe University, Assistant Professor, 自然科学研究科, 助手 (30161029)
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| Co-Investigator(Kenkyū-buntansha) |
ISOZUMI Yasuto Chemical Institute, Kyoto University, Associate Professor, 化学研究所, 助教授 (50027603)
MATSUSHITA Mariko Research Institute for Higher Education, Kobe University, Research Associate, 大学教育研究センター, 教務職員 (50110804)
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| Project Period (FY) |
1991 – 1992
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| Keywords | TREE RING / POLLEN / SEDIMENT / GRAIN SIZE ANALYSIS / EROSIONAL ENVIRONMENT |
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| Research Abstract |
Analyses of tree-ring widths that span the past 300-400 yr in samples taken from two areas in the Mt. Myoken-san in the northern area of Hyogo prefecture indicate that tree ring width was small when annual precipitation was large during past 90 years. This tendency was also seen in the age of pre-observatory from historical records ; there happened many floods when the ring width was comparatively small.
Grain-size analysis of pond sediments in Kobe district shows that years of heavy rainfalls can be traced in the grain-size sequences from the ponds located in the heavy rainfall area by the use of 137Cs concentration. These years show up as prominent coarsenings in the grain-size distribution in the heavy rainfall area while there was no prominent coarsenings in the area of no heavy rainfall.
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