| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Land based X-band radar and depth sounding device attached to small fishery boats have been employed to monitor continuously and robustly the morphologies at the river mouth of River Tenryu. X-band radar can scan the boundaries between sea and land borders, and can trace the distributions of river sand bar, river terrace etc. Depth sounders attached to fishery boats collect depths distributions from the river channel to the offshore coastal zone. Several flushing of river sand bar were observed during the study. Flushing is mainly due to the flood, however, sometimes the effect of wave motion became dominant. Position of the plan center of river sand bar was shifting to the river channel side during the study period with a speed of approximately 5 m/year. The river terrace decreased its volume drastically during the study period by 800,000 qubic meters. Both results suggest that the area is in an eroding environment and the morphology of the river mouth will change in the near future.
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