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The Pacific Northwest Laboratory used a glass-walled hydraulic (water) flume to physically model air flow near an axisymmetric knoll in a neutral atmospheric boundary layer. The knoll was a 1:250 scale model. An upstream velocity profile (1/7 power law), characteristic of a neutral atmospheric boundary layer, was produced by locating a 10-cm-high (4-in.) trip near the flume entrance and by appropriately roughening the flume floor. Mean velocity, rms velocity, and turbulence intensity profilesdoi:10.2172/5569503 fatcat:ab4oia3pobfspf4halgwlbr47e