Abstract
Controlling adverse density currents has been an important issue on water quality and ecosystems of brackish water regions. This study proposes to apply sluice gate for flexible control of density current migration in open channels. Hydraulic characteristics of density flows around a sluice gate are investigated by flume experiments employing the Particle Image Velocimetry technique and numerical calculations by a Large Eddy Simulation model. The results show that the behavior of density front migration under a sluice gate is dominated by internal Froude number of both fresh water and salt water layers, and entrainment of salt water in a downstream region of a dike is influenced by evolution of instantaneous flow structures in a fresh water layer.
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