Author(s): G. A. Lawrence
Linked Author(s):
Keywords: No Keywords
Abstract: This paper presents the results of an investigation into the mixing between layers caused by the presence of a two- di mensional obstacle in a steady, two-layer fl ow. Experiments were performed in a flume l2.8 m long. 60 cm high and 38 cm wide. Fresh and salt water. flow over. a fixed obstace. The processes. of entrai nment and mixing are revealed using laser induced fl uor escence, and velocity and conductivity pro-files. Hydraulic principles are used to develop a classification scheme that predicts the regime of flow. In flows with a crest control or an approach control (an internal hydraulic control in the flow approaching the sill) internal hydraulic jumps occur. Mixing between layers ls significant in flows with internal hydraulic jumps; however, much of the entrainment occurs in a shear layer upstream of the jump.
Year: 1985