| Project/Area Number |
17K00614
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Modeling and technologies for environmental conservation and remediation
|
|---|
| Research Institution | Tottori University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2017-04-01 – 2021-03-31
|
| Project Status |
Completed (Fiscal Year 2020)
|
| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
|
|---|
| Keywords | 底質 / 溶出 / 栄養塩 / 海水侵入 / 水圏現象 / 生態系 |
|---|
| Outline of Final Research Achievements |
The purpose of this study was to understand the effects of seawater intrusion into a freshwater body on water quality and biomass. We collected bottom sediment from brackish lakes and tidal rivers close to freshwater, adjusted the salinity to be equal to seawater (equal to or 1/128 times) using artificial seawater, and reproduced the elution test simulating seawater intrusion by changing the temperature, etc. The results showed that there was no difference in pH and dissolved oxygen concentration depending on salinity, but the higher the salinity, the greater the amount of ammonium nitrogen and phosphate phosphorus eluted. Based on the results of the simulated laboratory experiments, numerical calculations showed that there was a change in the plankton community and an increase in the amount of nutrients and other substances transferred due to the anoxic condition of the bottom layer after the salinity increased.
|
| Academic Significance and Societal Importance of the Research Achievements |
研究の結果より，海水侵入の初期に底質からの溶出した栄養塩類は，細菌および動物プランクトン相に利用されるものと考えられた．本実験の成果を踏まえて海水侵入後の水質および物質循環を検討することが重要となる可能性が示唆されたと考えている．
気候変動あるいは人為改変により淡水湖沼に海水が侵入した場合に，生物種に大きな変化が発生するのみならず，物質循環にも大きな影響が発生することが示唆されるものである．
|
