ATLANTIC ESTUARINE TIDES 



Hudson River Tides 



409 





 

 4.6 



I 



19 

 4.2 



h. m. 



5 49 



6 36 



II 



15 

 3.6 



h. m. 



5 49 



6 36 



III 



3.3 



h. m. 



5 44 



6 41 



IV 



3.3 



h. in. 

 5. 47 



6 38 



V 



MX 



3.3 



h. to. 



5 43 



6 42 



VI 



"X 



3.4 



fc. TO. 



5 27 



6 58 



VII 



9% 

 3.2 



A. TO. 



5 19 



7 6 



VIII 

 10 

 3.0 



/?,. TO. 



4 57 



7 28 



IX 



9X 



2.9 



h. to. 

 4 52 



7 33 



X 



9X 



2.4 



h. to. 



4 42 



7 43 



XI 



8 



H. W. interval from 



Sandy Hook. 

 H. W. advance in last 



hour (miles). 

 Mean tide range 



(feet). 



h. m. 



6 7 



h. to. 



6 18 













The two curves below, which I owe to the courtesy of the 

 Superintendent of the Coast Survey, show 48 hours of continuous 

 observation at Albany and Sandy .Hook. Both are on the same 

 scale, and they well illustrate the extremes met in a river. The 

 Albany tide, figure A, shows the characteristic steep front of 

 waves that have traveled far in shallow water. The Hudson gets 

 aid in its struggle with coastwise sands at Sandy Hook from the 

 constant westward flow of water from Long Island sound through 

 East river and out to sea* 



In closing this examination of estuary tides it appears that 

 the} r vary from the type in our area only as their estuaries vary 

 from the type of a river valley, narrow above and wide below, 

 partly drowned in the sea. ..The commonest modification of this 

 geographic type on the Atlantic coast results from the tendency 

 of coastwise sands to close the bay mouths. This agency is evi- 

 dent at the mouths of the Hudson and Delaware; it gives the 

 Chesapeake tides of a river type and encloses the mouths of the 

 drowned valleys further south, forming the sounds in which 

 lunar tides are less significant than the effects of prevailing 

 winds. 



* H. Mitchell : Ann. Rep. U. S. Coast Survey, 1886. 



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