Abstract
The depth of inflowing layer into the artificial reservoir has been studied as a problem of density current. In this paper, the author tried to make clear the behavior of the water movement in the Sagami Reservoir, in particular, the trace of inflowing water and the process of circulation at the vertical profile.
From the results of observation, it may be considered that the movement of inflowing water in the reservoir is governed by the distribution of physical and chemical properties, especially, by the formation of thermal stratification. In the Sagami Reservoir, it was observed that the river water flows into the standing water, due primarily to temperature difference. The inflowing water flows into the equivalent density layer in reservoir water, forming a clear boundary between the inflowing and the standing water. A current flowing upstream is produced at the surface of the reservoir as a counter flow of the density current.
Taking into account of these hydraulic properties, it is concluded that the inflowing water which is warmed before it reaches the reservoir flows through directly to the outlet without making strong mixing. This may results in small advective heat transfer to the reservoir making exceptional characteristics as the Japanese artificial reservoir.
