A structure built beside the sea can influence places beyond the area it directly occupies. Coastal curr transport lo sediments wh solid barr interrupt fami pathways a cause mov particles t settle i different loca along neighboring shores. Sand may accumulate on one side of a harbor wall while another stretch receives less than before. The wall can therefore protect one place and contribute to change elsewhere. Understanding these connections requires looking beyond the structure itself. A shoreline is part of a moving system, so an intervention must be considered in relation to the wider pattern of transport.

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