Longshore drift overall is certainly a good thing. It is a natural process which is vital for the transfer of sediment necessary to construct beaches, which also help to protect against erosion. Longshore drift can have negative impacts where it prevents access to shipping channels and disrupts human activities. Structures such as Groynes are even installed in some areas to help make Longshore Drift more effective in allowing sediment to build up.
Hope that is of help,
Which unis have sent theirs?