Currents and related problems at Metropolitan Beach, Lake St. Clair / John C. Ayers.

westward current both "south" and "west" switches would make contact and both directions would be recorded.
In the final studies of possible flotsam deflectors and of
details of the alongshore current, a hydrographic model of the
Huron Point region was made. This was a distorted Fronde model
with horizontal scale of 1: 10,000 and vertical scale of 1 v 16
and covered the region from about Harrison Road to east of Huron
Point. An electric fan was used to simulate wind.
In the study of the currents of Lake St. Clair a hydrographic
model of the whole lake was used. This was a distorted Fronde
model with horizontal scale of 1: 60,000 and vertical scale of
1: 1,000. The interior of the modelled delta of the St. Clair
River was excavated in order to provide a stilling basin to quiet
the feed-water simulating the inflow of the St. Clair River.
From the stilling basin the channels of Chenal Ecarte, Johnston
Channel, South Channel, Middle Channel, and North Channel opened
to the body of the lake. At the lower end of the model the
Detroit River opened, below Peach Island, into a second stilling
basin whose outlet was adjusted to the scaled depth of the Detroit
River.
Wind over the lake model was simulated by a linear "wind
horn." Compressed air was led into the ends of a 6-foot plastic
pipe, 2" in diameter, along one side of which a line of small
holes was drilled. From the middle of the pipe a connection lead
to a U-tube manometer. The plastic pipe was mounted in a horizontal venturi box in such way that air flowed from the line of
holes and through the venturi, entraining additional air from

around the plastic pipe. A horizontal flow-smoothing plate was

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