A 60-year record of rainfall from the sediments of Jinheung Pond,Jeongeup, Korea |
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Authors: | Wook-Hyun Nahm Gyoo Ho Lee Dong-Yoon Yang Ju-Yong Kim Kenji Kashiwaya Masayoshi Yamamoto Aya Sakaguchi |
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Institution: | (1) Geological & Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 305-350, Korea;(2) E&P Team, Korea Gas Corporation (KOGAS), Seongnam, Gyeonggi, 463-754, Korea;(3) Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa 920-1192, Japan;(4) Low Level Radioactivity Laboratory, Kanazawa University, Kanazawa 920-1192, Japan |
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Abstract: | This paper describes mean grain-size data from the 137Cs- and 210Pb-dated sediment core BS-3 (33-cm long) recovered from Jinheung Pond, located in the southwestern part of the Korean Peninsula.
Grain-size analysis of the Jinheung Pond sediments shows a clear signal for changes in annual precipitation over the past
60 years. Instrumental records of annual precipitation (AP) and the annual summation of the precipitation of >50 mm per day
(AP50), which reflects the energy available for sediment transport, correlate well with the mean grain-size distributions
measured in the core. The most plausible mechanism for this response in mean grain size is variations in the annual amount
and intensity of precipitation. Heavy precipitation enhances soil erosion over the catchment area and increases the transport
capacity of streams and rivers. Thus, coarser mean grain size should reflect higher precipitation, and smaller mean grain
size should reflect lower rainfall. In the data from core BS-3, however, grain-size peaks attributed to increased annual precipitation
are not prominent. This is because a dam prevents removal of fine particles from the pond via the outflow. Therefore, the
mean grain-size value represents somewhat larger sediments together with fine clays. The results of this study show that sediments
of dammed lakes and ponds are well suited for high-resolution environmental investigations, especially for records of changes
in precipitation over time. |
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