Growth of River Deltas

[Hydroeccentricity]

I know that deltas can expand over time (the Mississippi in the past, the Shaat al Arab, the Huang He, et al), or they can contract (the Mississippi in the present, some parts of the Nile Delta). But I can't seem to find anything, on JSTOR, or google, or my university library, that gives me any information about what causes this process. Presumably it's caused by some equilibrium, or lack their of, between silt deposition and sea wave buffeting. But how do these variables work? Is sea buffeting constant chronologically and geographically? Is there a predictable relationship between the amount of silt put into the river by agriculture and the rate of delta formation? It seems to be pretty random how deltas change. For example, the Huang He reaches the sea further east than it did at the beginning of the neolithic, due to silt deposition. But the Nile river delta hasn't moved in two thousand years, and has only slightly moved in five thousand years, despite being famously silty. The Mississippi delta grew, but now it's shrinking, despite higher erosion upstream than in the past. Is there any scientific research whatsoever into what causes deltas to grow or shrink?

[mèþru]

This video explains it pretty well: https://www.youtube.com/watch?v=A47ythEcz74