Beach Changes at Westhampton Beach, New York, 1962-1973.
COASTAL ENGINEERING RESEARCH CENTER FORT BELVOIR VA
Pagination or Media Count:
Repetitive surveys of the above MSL beach were made along 20 profile lines at Westhampton Beach, on the south shore of Long Island, New York, from 1962 to 1973. After the study had begun, a large groin field 15 groins with associated beach fill was constructed in the middle of the area being surveyed. The data show that shoreline erosion of 2 to 3 meters 6.6 to 9.8 feet per year within and updrift of the groin field was reversed after groin construction shoreline erosion downdrift west of the groin field accelerated to at least 28 meters 96 feet per year. Profile lines updrift east of the groin field accreted at a rate of 1.10 meters 3.6 feet per year as measured at the MSL shoreline and showed an increase of 3.68 cubic meters per meter 1.47 cubic yards per foot per year in sand stored on the beach above MSL. The shoreline within the groin field accreted at a rate of 3.45 meters 11.3 feet per year and the beach unit volume increased at a rate of 11.92 cubic meters per meter 4.75 cubic yards per foot per year, including beach fill. Downdrift of the groin field the profiles showed an average MSL shoreline gain of 0.66 meters 2.2 feet per year and an average unit volume loss of 0.12 cubic meter per meter 0.05 cubic yard per foot per year. The largest changes measured resulted from the storm of 22 March 1973, which eroded the shoreline an average of 20 meters 65.6 feet and removed an average of 29 cubic meters per meter 11.6 cubic yards per foot of beach front above the MSL elevation. Beach changes were found to be seasonal, with the least amount of sand above MSL from January to May.
- Physical and Dynamic Oceanography
- Hydrology, Limnology and Potamology