On Long Island\'s ocean shoreline, you have probably heard that beach sand moves
ID: 110442 • Letter: O
Question
On Long Island's ocean shoreline, you have probably heard that beach sand moves alongshore from east (Montauk) to west (Coney Island), but on any particular day you might see waves pushing sand to the east instead. At East Hampton waves on some days move 265,000 cubic yards of sand to the east every year and on other days, waves move 387,000 cubic yards of sand annually. What is the magnitude of the net average longshore transport? In which direction is it going? (with the process in detail, please)
Explanation / Answer
Let 'L' be the length of the beach
=> from the question we can see that there is 265,000 cubic yards of sand to east and 387,000 cubic yards of sand to west
=> net loss = 387000-265000 =122000cubic yards
let k be the net average longshore transport
122,000 / L / k =1
from the rule of one cubic yard per foot per foot where l is length of beach
=> k = 122000/ L and it will be towards west
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