Naoya OGAWA
Laboratory and Numerical Study on Mixing Process of Turbidity Currents Flowing into a Reservoir
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 driven 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.
The PIV image processing method has not been used to understand the intermediate density driven currents. In this study, laboratory experiments and numerical simulation was carried out to understand flow structures in intermediate density currents flowing into a reservoir. Flow structures observed in intermediate density currents such as Reynolds stress or temporal averaged velocity show reasonable results. Laboratory experiments show good agreement with numerical simulation for temporal changes of velocity fields. The PIV method is efficient methods to measure the flow characteristic of the intermediate driven density current.
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