Estimation of sedimentation rates for 60 years in Kushiro Mire, Hokkaido, northern Japan, by using Cs-137 and Pb-210
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Accession number;04A0714045
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| Title;Estimation of sedimentation rates for 60 years in Kushiro Mire, Hokkaido, northern Japan, by using Cs-137 and Pb-210 |
| Author;
MIZUGAKI S
(Hokkaido Univ.)
NAKAMURA F
(Hokkaido Univ.)
ARAYA T
(Hokkaido Univ.)
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Journal Title;Suikei Kozo to Ryuiki Dotai ni Motozuku Mizu, Dosha Ryushutsu Kiko to Saigai Kankyo ni kansuru Kenkyu Heisei 12-15 Nendo No.12306008
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Journal Code:N20041657
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ISSN:
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VOL.;NO.;PAGE.126-131(2004)
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| Figure&Table&Reference;FIG.6, REF.5 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The history of sediment deposition for this several decades in the Kushiro Mire into which the Kuchoro River drains was studied. Short-term (up to 20 years) deposition rates and frequency of heavy rainfall events were estimated by the dendrochronological technique studying an even-aged uniform forest and adventitious roots. For medium to long-term (for 40 to 100 years) deposition rates, the radiochronological analysis using Cs-137 and Pb-210 were used. Several massive deposition caused by heavy rainfall events are recognized from the adventitious roots analysis. The highest sedimentation rate occurred in the years from 1965 to 1980 when the Kuchoro River had been extensively channelized. This suggests that the agricultural activities produced a large amount of sediment transported into the wetland through the drainage system. |
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