2011 Fiscal Year Final Research Report
Effect of the algal growth in the estuary on enhance of the settlement of suspended particles
| Project/Area Number |
22760372
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Hydraulic engineering
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| Research Institution | Yamaguchi University |
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Principal Investigator |
YAMAMOTO Kouichi 山口大学, 大学院・理工学研究科, 准教授 (50355955)
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| Project Period (FY) |
2010 – 2011
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| Keywords | 水理学 / 環境水理学 |
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| Research Abstract |
Under water micro video scope was developed to measure floc settling velocity and applied to the suspended sediment floc in the Chikugo River estuary. The effective densities of the flocs were measured successfully. The floc density distribution function was proposed from the floc settling speed and their diameters. The floc density distribution function varied with tide. In ebb tide, floc densites were smaller than in flood tide. This fact shows that the flocs in flood tide mainly consists of the mud which was suspended from the river bed. Mass settling flux was also calculated. When suspended sediment contains algae or algal residuals, the settling velocity showed lower value. On the other hand, containing high concentration of extracellular polymeric substances(EPS) made settlement velocity high.
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