Science · 6 pages · 12 min
Why a river builds a delta
A river drops its sediment where the current slows, and the deposits build new land.
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From the opening
A delta forms where a river meets standing water and slows enough to drop the sediment it has been carrying. Sand and mud accumulate, the bed rises, and the channel splits into distributaries across the new deposit. The opening covers where the current drops its load, how distributaries switch lobes, and why some mouths build no delta.
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Inside
- Where the current drops its load
- How distributaries switch lobes
- Why some mouths build no delta
- What a dam does to the supply
- Where the idea stops applying
- A distinction worth keeping
Sources
- Deposition where river flow enters standing water
- River-dominated, wave-dominated, and tide-dominated delta shapes