120 J. BE. Hilgard—Tidal Waves and Currents. 
changed§ during violent storms, when the direction of the 
waves happens to be oblique to that of the channel; or, when 
the sea runs directlyjupon the channel, the depth of water 
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EFFECT OF SINKING STONE-FLEET ON CHARLESTON BAR. 
may be considerably diminished, for the time being, by_ the 
sand rolled up by the waves. But in all these cases it 1s 
found that the normal depth is speedily restored by the scour 
