Which risk escalates when human-constructed levees significantly constrain a deltaic river's natural floodplain?

💡 Explanation

When deltaic river floodplains are constricted, reduced sediment deposition occurs because the levees channelize flow velocity, preventing sediment settling onto the floodplain, resulting in decreased sediment delivery downstream. Therefore increased sediment starvation results, altering delta morphodynamics rather than biodiversity changes, salinity changes, or mangrove expansion.

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