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Journal Articles

Relationships between sediment concentrations from $$^{10}$$Be analysis and morphometric aspect in Sangun catchment Area, Fukuoka Prefecture, Japan

Pachri, H.*; Mitani, Yasuhiro*; Ikemi, Hiroaki*; Nakanishi, Ryunosuke*; Kokubu, Yoko

Journal of Geological Resource and Engineering, 3(4), p.163 - 172, 2015/09

Recently, the contributions of slope failures have been difficult to quantify over the time scales of the sediment concentrations in Sangun catchment area, Fukuoka Prefecture. This paper describes how cosmogenic nuclide methods have provided information about the geomorphic process by utilizing $$^{10}$$Be. The $$^{10}$$Be/$$^{9}$$Be ratios were measured by AMS. We assume that the cosmogenic nuclide concentrations stored in the sediment of a river can increase or decrease, depending on the amount of mixing of sediments during transport through the fluvial system. As results, the $$^{10}$$Be concentrations have been calculated to determine the short term sediment mixing rate in the catchment area. Therefore, the relationship between the morphometrics of the drainage basin, the sediment concentration by $$^{10}$$Be analysis and the contribution of landslides to landscape changes over timescales of several years have been investigated in Sangun catchment area.

Oral presentation

A Study of sediment movements in mountainous catchments by beryllium isotopes analysis

Ikemi, Hiroaki*; Pachri, H.*; Kokubu, Yoko; Mitani, Yasuhiro*; Kuroki, Takahito*

no journal, , 

One of issues in the comprehensive river-sediment management is to develop how to estimate a sediment production from a mountainous stream. In this study, beryllium isotopes of quartz extracted from sediment samples have been analyzed by JAEA-AMS-TONO to clarify a sediment dynamics in mountain streams. The sediment samples have been collected at four riverbeds and one hillslope in two different sub-catchments (A and B) of a Mesozoic granitic block located in the Umi-kawa river basin, Fukuoka. The sample of the catchment B shows a little bit higher value in $$^{10}$$Be-content than those of catchment A. This result indicates that the river sediment in the catchment B includes quartz grains that have been exposed on a ground surface for a long time compared with the catchment A. It is also possible that the river sediment in the catchments A contains more landslide materials because the landslide materials, which have come from a deeper part, might have a lower value in $$^{10}$$Be-content.

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