深水湖における融氷起源河川水の挙動に関する考察 : レマン湖における口ーヌ川の例(博士論文要旨)
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"Abstract This thesis aims to study the effects of the climatic changes and the effects of the tributary on the limnological system. The first part of the study is about the analyses of the relationships between the climatic changes and the winter thermal conditions of the lake. Earlier (in date of Forel), Lake Geneva, an example of semi-large scale deep lakes, would undergo a complete overturn at the end of every limnological winter. However, the extent of overturn has progressively reduced probably due to global warming. Serious consequences related to the water quality of the deeper part of the lakes, such as oxygen depletion, occur due to this fact. The second part of the study is about understanding the movement of the Rhone inflow into Lake Geneva. On the basis of the analysis of extensive periodical records, it appears that the Rhone inflow attains the maximum point in the lake in spring. Further, the results of the field observations carried out in summer demonstrated that on one hand, the Rhone entered in the thermocline and passed around the north shore of the lake by Coriolis force. Further,We clearly noticed that it reached the central level of the main basin called the ""Grand Lac"" as Well. On the other hand, due to the detailed observations of the conductivity-temperature-depth(CTD) probe (at lm intervals), we observed that the Rhone inflow was divided into two or more depths,connected with the thermal staircases in the thermocline. There is a possibility that the Upper Rhone's intrusion (cold and very turbid water) causes double-diffusive convection and appears to be formed by particle settling from the cold and turbid intrusion of the Upper Rhone River water. A model, using diffusive-advection equations with thermal diffusivity and silt sedimentation, calculated the silt finger formation process. This model confirmsthat the observed profiles were formed by double-diffusive convection. Internal waves affect the intrusion pattern, with single or twin peaks, by altering the thermocline thickness."
- お茶の水地理学会の論文
- 2006-03-20
お茶の水地理学会 | 論文
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