| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
|
|---|
| Outline of Final Research Achievements |
Based on the field observation and numerical simulation, this study focuses on the influence of the regional warming trend on the water quality and circulation of the lake as valuable water resources in the study site. Concerning the lake water circulation, the numerical results show that the potential energy of the lake water becomes smaller than the wind-induced turbulent energy for the vertical mixing in February of 1986, 2011 and 2012 during 1986-2013. The simulation study reveals that the decrease in the potential energy is caused by the temporal hiatus in the air temperature increase since 2000 in comparison with 1977-1999. The results on the water quality suggest that the long-term fluctuations of the lake thermal environment due to the regional climate change favor eutrophication and chlorophyll maxima in the deep layer, but that the drastic changes in water quality like red tide cannot occur due to very low concentration of phosphorous in Lake Ikeda.
|
