| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
|---|
| Outline of Final Research Achievements |
New method for measuring wash load was proposed. Fluvial acoustic tomography system (FATS) with central frequencies (5, 10 and 30 kHz) was deployed in the Ota River, Gono River and Qiantang River. The FATS enabled us to measure cross sectional averaged flow velocity, streamflow and singa-to-noise ratio (SNR). The cross-sectional average suspended sediment concentration (SSC) was deduced from the SNR. Thus, continuous measurements of the wash load was conducted. Although the viscous absorption of sound due to SSC was around 10 times as large as that from an acoustic theory in shallow rivers (Ota and Gono River), the viscous absorption in Qiantang River was comparable with that from the acoustic theory.
|
