What is the most effective way to prevent beach erosion? put some sandbags at the beach put some big rocks at the beach as a barrier construct resorts at the beach replant mangrove trees, seaweeds and seagrass

The most effective way to prevent beach erosion is to replant mangrove trees, seaweeds and seagrass. The strategic planting of vegetation can be used to help control erosion. The roots of these plants help to anchor the sand and ensure that it is not carried off in erosion. This is why many areas plant seagrass and build marshes along coasts to prevent erosion. 

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