2016 Fiscal Year Final Research Report
Clarification of sludge sedimentation mechanism in tidal flat and its application to restore method for tidal flat
| Project/Area Number |
15K18124
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Hydraulic engineering
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| Research Institution | Hiroshima University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 巻き上がり / 液性限界値 / 吸着イオン / 間隙水のイオン強度 / 電気二重層厚 |
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| Outline of Final Research Achievements |
Aggravation of tidal flat caused by excess deposition of sediment. Property of sediment greatly changes by amount of organic matter, ion of pore water. Considering cohesion and repulsion of sediment based on DLVO theory, ionic strength of pore water and adsorbed ion are important parameters determining electric double layer thickness and surface potential. It is expected that when the ionic strength becomes higher, the electric double layer becomes thinner and sediment tends to aggregate easily. In this study, to understand the sludge sedimentation mechanism, relationship among liquid limit (=liquidity), adsorbed cation of sediment, ion concentration, and amount of organic matter.
The results revealed that amount of adsorbed ion have a little effect for liquid limit. Ionic strength have a strong relationship to liquid limit, when ionic strength become increase, liquid limit become decrease. When amount of organic matter decrease 1.5%, liquid limit decrease 42%.
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| Free Research Field |
海岸工学
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