Which mechanism causes increased coastal erosion near large river estuaries when upstream dams alter streamflow patterns?

💡 Explanation

When dams alter streamflow, sediment transport decreases because the dams trap the sediment load, leading to less replenishment of coastal sediment. Therefore, increased coastal erosion results from reduce sediment replenishment, rather than altered salinity, currents, or storm surge buffering, which don't directly link to sediment supply.

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