Abstract
A side-cavity zone is often observed in natural rivers. It is generally known that additional shear stress is generated, and it results in depletion of mainstream energy. A part of mean kinetic energy in a main-channel is used for production of a large-scale horizontal circulation in the cavity. However, the detail mechanism such as energy transport is poorly understood. Therefore, we conducted PIV measurements in a laboratory flume and compared space distributions of mean velocity components and Reynolds stress varying a cavity geometry. In particular, a practical calculation method of Reynolds stress was also developed and its accuracy was examined by comparison with the measured data. Furthermore, contributions of components in an energy transport equation were revealed quantitatively.
