Harbour and River Bars
A harbour or river bar is a sedimentary deposit formed at a harbour entrance or river mouth by the deposition of sediment or the action of waves on the sea floor or adjacent beaches. A bar can form a dangerous obstacle to shipping, preventing access to the river or harbour in unfavourable weather conditions or at some states of the tide. Where beaches are suitably mobile, or the river’s suspended and/or bed loads are large enough, wave action can build up a bar to completely block a river mouth, damming the river, preventing access for boats or shipping, and causing flooding in the lower reaches of the river. This situation will persist until the bar is eroded by the sea, or the dammed river develops sufficient head to break through the bar.
Read more about this topic: Shoal
Famous quotes containing the words harbour, river and/or bars:
“Patience, the beggar’s virtue, Shall find no harbour here.”
—Philip Massinger (1583–1640)
“the folk-lore
Of each of the senses; call it, again and again,
The river that flows nowhere, like a sea.”
—Wallace Stevens (1879–1955)
“The last public hanging in the State took place in 1835 on Prince Hill.... On the fatal day, the victim, a man named Watkins, peering through the iron bars of his cell, and seeing the townfolk scurrying to the place of execution, is said to have remarked, ‘Why is everyone running? Nothing can happen until I get there.’”
—Administration for the State of Con, U.S. public relief program (1935-1943)