How do upstream dams reduce the amount of sediment reaching the Mississippi River delta?

Upstream dams significantly reduce the amount of sediment reaching the Mississippi River delta by capturing and impounding the river's sediment load within reservoirs.12

When a river's flow is obstructed by a dam, the water velocity decreases, causing suspended particles to settle and deposit on the reservoir floor rather than continuing downstream. Because these dams effectively trap silt and other debris, the lower reaches of the river are deprived of the sediment necessary to maintain the delta's landmass. Consequently, the delta is left vulnerable to erosion by marine processes, as it no longer receives the annual sediment additions that historically helped counteract wave action and land loss.314