Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
Online ISSN : 2185-467X
ISSN-L : 2185-467X
Annual Journal of Hydraulic Engineering, JSCE, Vol.60
SEDIMENT EROSION AND DEPOSITION IN THE FORMER ARASE DAM RESERVOIR UNDER THE DAM REMOVAL PROJECT
Kazuaki OHTSUKIHiroki IYOOKAYasuo NIHEIYusuke YOSHIMORIShunsuke NAKAMURANorio ONIKURA
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2016 Volume 72 Issue 4 Pages I_853-I_858

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Abstract
 The Arase Dam on the Kumagawa River in Kumamoto Pref., Japan, has been subsumed under removal project as the first high-dam removal in Japan. In March 2015, the dam crest on the right side has been removed with the first flushing and continuity of flow and sediment has been restored. In this study, we conducted elevation measurement with RTK-GNSS and SfM analysis using UAV aerial photo set. As a result of our investigation, we found significant scouring in the upper stream of the dam site caused by several times of floods (Qmax=2000-3000 m3/sec). According to our estimation, 1.5 * 105 m3 of the sediment on former reservoir (26% of total) are washed to the downstream and 1.8 * 105 m3 was found on the immediate downstream of the dam site and it created new sand bar.
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© 2016 Japan Society of Civil Engineers
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