Effective Application of a Mechanical Circulator for Reducing Hypoxia in an Estuarine Trench
| Autor: | Susumu Kanayama, Kota Nakase, Seiji Kino, Jun Sasaki |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
geography
Engineering geography.geographical_feature_category 010504 meteorology & atmospheric sciences 010505 oceanography business.industry Circulator Hypoxia (environmental) Ocean Engineering Estuary 01 natural sciences Volumetric flow rate Draft tube Impeller Modeling and Simulation Trench Geotechnical engineering business Surface water 0105 earth and related environmental sciences Civil and Structural Engineering |
| Zdroj: | Coastal Engineering Journal. 51:309-339 |
| ISSN: | 1793-6292 2166-4250 |
| Popis: | Application of a mechanical circulator was considered to reduce hypoxia and anoxia in an estuarine trench by numerical examination in terms of the required flow rate and direction along with the physical mechanism of its effectiveness. We then developed a prototype of the circulator, generating downward flow by an impeller attached to the main body of the circulator floating on the surface, in which the surface water is being transported to the bottom through a flexible draft tube connected to the floating body. The effectiveness of the proposed mechanical circulator was verified by performing field tests in a dredged trench in Tokyo Port of Tokyo Bay, while monitoring current and water and sediment quality. The field test results showed that the mechanical circulator achieved the desired effects, including reduction in hypoxia and improvement of water and sediment quality in the trench. We also applied a primitive equation model and found that the model can successfully reproduce the field test results. ... |
| Databáze: | OpenAIRE |
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