| 研究実績の概要 |
In this year, the principal investigator completed the remaining work related to data analysis, manuscript writing, sharing research findings in international conferences and national meetings, as well as, article publication in international indexed journals.
To be more specific, the principal investigator achieved the following key tasks:
1. Precipitation and turbidity analysis during rainy season: By analyzing two decades of precipitation data from the Gono River watershed (Hiroshima). This analysis, was conducted using turbidity-discharge (T-Q) loops and an enhanced hysteresis index, the main revealed outcomes:
Frequent intense rainfall events (every 3-4 years) with varying spatial intensity (not confined to a specific zone). Also, clockwise hysteresis patterns indicating that sediment sources from near-channel areas, and anticlockwise patterns indicating erosion from nearby areas. In addition, turbidity peaks during floods potentially reflcted earlier/later arrival of turbid water from distant upstream sources due to intense precipitation.
2. Improved the estimation of continuous river flow direction using the acoustic tomography principles: In this regards, principal investigator improved the guidelines for continuous river flow direction estimation using: i) Cross-shaped underwater acoustic transducer deployments in multi-directional streams, and ii) Triangular deployments in unidirectional streams.
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