Velocity Measurements in a Rectangular Embayment Attached to a Straight Open Channel

MUTO, Yasunori, IMAMOTO, Hirotake, ISHIGAKI, Taisuke

Velocity measurements were carried out in a straight open channel with a rectangular embayment. Two laser Doppler anemometers (LDA) and an electromagnetic current meter (EMC) were employed. Flow exchange between the main flow region and the dead zone, formed within the embayment, is investigated. Turbulent shear region induced at around the junction between the main flow and the dead zone is also studied.Rough sketch of the flow structure drawn from preliminary experiments indicates that large circulating flow is induced in the embayment for the inbank case, however such a circulation cannot be seen for the overbank case. In this case flow exchange between the embayment and its adjacent flood plain takes place in a quite complex manner. Aspect ratio of the embayment also affects the exchange process. For the tested cases arectangular embayment, whose aspect ratio is 3, exchanges more effectively than the square embayment case due to instability of the dominant circulating flow formed in the embayment.

Velocity Measurements in a Rectangular Embayment Attached to a Straight Open Channel

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