. Bulletin of the Geological Society of America. Geology. 492 A. W. G. T\'ILSON SHORELINE STUDIES ON ONTARIO AND ERIE that when they had their nets set in deep water during the prevalence of strong easterly winds they would find in drawing the nets that any floating submerged leaves or weeds would be caught on the opposite side of the net, showing that the undercurrent was from the west. This would indicate that the waters, being driven to the west, pile up at Bur- lington beach, and the head of water thus raised forces a portion of the water back as an undercurrent. The seiche oscillations on
. Bulletin of the Geological Society of America. Geology. 492 A. W. G. T\'ILSON SHORELINE STUDIES ON ONTARIO AND ERIE that when they had their nets set in deep water during the prevalence of strong easterly winds they would find in drawing the nets that any floating submerged leaves or weeds would be caught on the opposite side of the net, showing that the undercurrent was from the west. This would indicate that the waters, being driven to the west, pile up at Bur- lington beach, and the head of water thus raised forces a portion of the water back as an undercurrent. The seiche oscillations on the lakes must tend to generate local undercurrents at the ends of the lakes whenever the water rises above the niean level. Out on the open lake the transitory movement of the water before the wind takes the form of a drift, and because of the prevalence of west- erly winds this drift is most frequently identified with the easterly. Figure 7.—Drift Currents in Lake Erie flowing body currents of the lakes. The drift currents vary their direc- tion with the wind that causes them, usually starting a short interval after the wind has commenced to blow and continuing for some time, often several hours and occasionally several days, after the winds that caused them have ceased. Where this drifting surface water impinges on a shore a longshore current is developed, the direction of the current being dependent on the angle at which the drift impinges on the shore- line. These currents, which for convenience may be designated wind currents, are seen during wind storms and reach their maximum velocity at times of the strongest storms. They are so intimately connected with wave and surf movements that both must be considered together. It is when they act in conjunction that active erosion, transportation, and deposition take Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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