Ancient river invasion reshaped estuary, altering coastal environments dramatically.
The Huaihe River estuary changed a lot from 1128 to 1855 due to the Yellow River's sediment-filled water. The estuary got wider and developed sandbars and underwater deltas. The tidal currents kept moving downstream, making the estuary stretch towards the sea. The shape of the estuary became more meandering and the entrance wider. The Huaihe River estuary and the Yellow River estuary have different characteristics and ways they evolved over time.
