File:Shore processes and shoreline development (1919) (14761700224).jpg

Identifier: shoreprocessessh00john (find matches)
Title: Shore processes and shoreline development
Year: 1919 (1910s)
Authors: Johnson, Douglas Wilson, 1878-1944
Subjects: Shorelines Coasts
Publisher: New York : John Wiley & Sons, Inc. (etc., etc.)
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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drawn from Lj^dd to the point of the nessthe succession of ridges is fairly regular. During the reign ofElizabeth, the distance from Lydd church to the extremity ofthe point was three miles, according to Redman^^. In 1860, asshown by sheet No. 4 of the Geological Survey of Great Britain,this same distance was nearly four miles, indicating that thepoint advanced seaward about one mile in a little less than threecenturies, which is equivalent to an annual advance of a littleover 6 yards. Redman^* studied the rate of advance as indi-cated by various lines of evidence accessible to him in 1852 andconcluded that the average annual increase, during two cen-turies has at least amounted to nearly 6 yards. Drew^^ foundthat from 1794 to 1860 the annual advance was about 5^ yards. There are about 25 beach ridges showai on Drews map (Sheet4, Geological Survey of Great Britain), as crossing the last mileof the distance from Lydd to the point of the ness. Although RATE OF BEACH RIDGE FORMATION 423
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424 SHORE RIDGES AND THEIR SIGNIFICANCE Drew states that south and southeast of Rye the ridges are morenumerous than could be shown upon the map, in discussingthe changes near the point of the Dungeness he says that he inserted all the fulls or shingle ridges on the previouslyfeatureless Ordnance map^^. Gulliver-^ counted twenty-threesuccessive shorelines on the east side of the ness betweenLydd and the sea, and as the ridges there cover a breadthof about a mile, and are shown by the Ordnance map to bebetween 20 and 25 in number, it would seem fair to assumethat near the point of the Dungeness one ridge was built on anaverage every 11 or 12 years. It should be noted that some ofthe ridges, especially those closest to the point, are short, andthat they are formed of material easily and rapidly secured fromthe south side of the ness which has long been suffering activeerosion; both of which facts would lead us to expect an unusu-ally rapid development of ridges near the point. That this

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