| Project/Area Number |
14102026
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (S)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
水工水理学
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
ISOBE Masahiko The University of Tokyo, Graduate School of Frontier Sciences, Professor, 大学院新領域創成科学研究科, 教授 (20114374)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SATO Shinji The University of Tokyo, Graduate School of Engineering, Professor, 大学院工学系研究科, 教授 (90170753)
KOIBUCHI Yukio The University of Tokyo, Graduate School of Engineering, Assistant Professor, 大学院新領域創成科学研究科, 講師 (60349800)
FUJITA Masafumi University of Yamanashi, Interdisciplinary Graduate School of Medical and Engineering, Research Associate, 大学院医学工学総合研究部, 助手 (60362084)
佐々木 淳 横浜国立大学, 大学院・工学研究院, 助教授 (50292884)
五明 美智男 東亜建設工業(株), 技術研究所, 水理環境研究室長(研究職)
渡辺 晃 東京大学, 大学院・工学系研究科, 教授 (80011138)
|
|---|
| Project Period (FY) |
2002 – 2006
|
| Project Status |
Completed (Fiscal Year 2006)
|
| Budget Amount *help |
¥114,400,000 (Direct Cost: ¥88,000,000、Indirect Cost: ¥26,400,000)
Fiscal Year 2006: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Fiscal Year 2005: ¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Fiscal Year 2004: ¥30,550,000 (Direct Cost: ¥23,500,000、Indirect Cost: ¥7,050,000)
Fiscal Year 2003: ¥30,420,000 (Direct Cost: ¥23,400,000、Indirect Cost: ¥7,020,000)
Fiscal Year 2002: ¥30,290,000 (Direct Cost: ¥23,300,000、Indirect Cost: ¥6,990,000)
|
|---|
| Keywords | Micro-bubble / Oxygen-depleted water / Tokyo Bay / Pelagic and Benthic environment / Mitigation / Sediment oxygen demand / Benthos / Solar-Panel / 底質酸素消費速度 / 現地実験 / モニタリング / 底泥微生物構造解析 / 自動昇降式観測システム / 底質堆積年代推定 |
|---|
| Research Abstract |
Oxygen-deficient water at the bottom of the bay causes serious damage to benthos and other living organisms. This water can be improved by supplying micro-bubbles into it. Although it is not feasible to install micro-bubble generator all throughout the bay but it may be possible to install them in some areas of the bay that are more likely to be affected by anoxic condition and then these areas can serve as a refuge for fishes just prior to the blue tide.
Micro-bubble is efficient in transferring oxygen to water because of its large surface area compared to volume and of its slow rising velocity. To determine the micro-bubble effect in improving water quality and the benthic environment, laboratory and field experiment had been performed.
In the laboratory experiment, the oxygen dissolution efficiency of the micro-bubble was examined under the various conditions. In the field experiment, micro-bubble techniques were found to be effective in transferring oxygen to water in the actual field. A further observation showed characteristic of micro-bubbles diffusion and improvement of sediment oxygen demand. In addition, the supply of micro-bubbles can drive shifts in microbial communities. These results of field experiment will give an idea for a required system to improve the oxygen-depleted water in closed bays.
|
