Footnote:
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Description:
Source: https://erdc-library.erdc.dren.mil/jspui/ ; Repetitive surveys of the above MSL beach were made along 20 profile locations on Ludlam Beach, New Jersey, from 1962 to 1972. The surveys provided data on temporal and spatial beach volume change and shoreline position. Storm changes were highly variable, with adjacent profiles often showing opposite trends. Sand volume losses from above MSL, resulting from seven storms, averaged in 2.3 yards per cubic foot, or 80,000 cubic yards per storm. For three of the seven storms the average change in MSL shoreline position suggested accretion while the beaches actually suffered a volumetric loss. Clear seasonal trends in the volume of sand above MSL were evident. A net accretion occurred from June through October, while November through May was a period of sand loss. The average seasonal range in sand volume above MSL was 18 cubic yards per foot. The seasonal range of sand volume change within the Sea Isle City groin system, located in the middle of the study area, averaged less than 10 cubic yards per foot. Yearly changes in sand volume varied from a gain of 2.9 cubic yards per foot t o a loss of 4.6 cubic yards per foot. Net yearly sand volume changes over the 10-year survey interval averaged -1.12 cubic yards per foot per year (a loss of 40,000 cubic yards per year from the entire island above MSL). The average MSL shoreline retreat rate for the same interval was 8.2 feet per year. The inlets bounding Ludlam Beach are characterized by an erratic shoreline, submarine bars, and shoal movements which typify inlets along sandy coasts. Corson Inlet, on the north , widened and migrated south at an average rate of 92 feet per year over the study period. Townsend Inlet migrated southward at an average rate of 9 feet per year. The inlets remove sand from the littoral cone at the expense of downdrift beaches. Thus material is released gradually or abruptly, such as following the March 1962 storm. A sand wave initiated by this unique event contained about 240,000 cubic yards ...