Abstract
The flow of water in the middle and surface layers around and over a lake bar was examined in terms of horizontal and vertical velocities, and divergence. These quantities were mapped and the patterns correlated with the general current velocity, wind conditions, and obstruction by the bar.1) The bar caused two types of flow around it. In the unstratified layer above the thermocline the flow continued right over the bar, although the exact pattern of motion depended upon the current speed and the geography of the bar.2) In the thermocline there was a strong tendency for the water to flow around the bar, although considerable upwelling and sinking of the layer occurred. Helical rotors appeared on either side of the bar.3) Internally consistent and detailed patterns of circulation were observed on a small scale without excessive expenditure of time or money.
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