The blue dots show the position of the measurements in the lower graphs. CTD profiles from both sides of the rapids show that the fresh surface layer on the upstream side and the denser water beneath it are mixed vigorously in the rapids. Also a denser water mass which was was not detected with the CTD on the upstream side is mixed into the water column. Flow seperation at Whirlpool Point. Eddy in Arran Rapids.
Gas bubbles are visible in the core.
Steller's sea lions. On the downstream side the two water masses are mixed thoroughly throughout the water column showing the importance of mixing in the rapids. Conclusions Measurements of current speed, sea surface slope, and density show the importance of extreme tidal flows for the modification of water masses in a coastal enviroment. B. Baschek , July.