Naoya OGAWA
A laboratory experiment on intrusion of intermediate density driven current
Tokuzo HOSOYAMADA
The murky waters harm environments in dam reservoir especially in case of heavy rain. When the reservoir has strong density stratification, the murky water generates intermediate density currents. Destruction of density stratification caused by the density currents is crucial effects on environment in the reservoir. Understanding the phenomena is important for environmental management of the dam reservoir. This study focused on the shape of intermediate density currents formed in the interface of two phase flow. A series of laboratory experiments on the currents were carried out.
In the result, the head shape strongly depends on relative density of two phase flow. The thickness is affected by the inflow condition. Flow velocity distribution was also measured from image processing algorithm PIV method. The method examined temporal change of velocity in the fixed measuring range. The results showed that the velocity is the fastest at the gravity head in the currents and decreases with time, on the contrary the thickness increases.
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