Theory 25/River deltas/Rate lens
Deltas Grow at Supply Rate
The claim
Delta progradation rate is set by the rate of sediment supply relative to accommodation creation, not by total supply.
01Mechanism
Land advances only where deposition outpaces subsidence and sea-level rise; the rate comparison sets the direction.
02Prediction
Progradation should track the rate difference.
03Refutation
Progradation tracking supply would remove accommodation.