| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Tadaharu 東京工業大学, 大学院・総合理工学研究科, 教授 (50159696)
OKAMOTO Mineo 東京海洋大学, 海洋科学部, 准教授 (70345403)
SAKAI Kazuhito 琉球大学, 農学部, 教授 (10253949)
AKAMATSU Yoshihisa 東京理科大学, 理工学部, 助教 (30448584)
OSAWA Kazutoshi 宇都宮大学, 農学部, 准教授 (30376941)
AKAHORI Ryosuke 東京工業大学, 大学院・理工学研究科, 助教 (50452503)
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| Budget Amount *help |
¥94,900,000 (Direct Cost: ¥73,000,000、Indirect Cost: ¥21,900,000)
Fiscal Year 2009: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2008: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2007: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2006: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2005: ¥61,490,000 (Direct Cost: ¥47,300,000、Indirect Cost: ¥14,190,000)
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| Research Abstract |
The transport processes of sediment and nutrients in a watershed in Ishigaki island, Okinawa, were studied by using various observation methods including stable isotope analysis. They were simulated by using numerical models by identifying several factors from the observations. The models predict that a proper combination of civil engineering countermeasure and change of farming method can reduce the sediment yield from the watershed by 74%. Observations of water quality and coral recruitment test in Nagura bay indicate that the water is eutrophicated and the corals cannot grow for a long time. Based on these observations, a quantitative target of the reduction of sediment and nutrients yield in watershed can be decided rationally.
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