4. The picture below shows a river in Washington discharging to the ocean in a hyperpycnal state, which means the density of the fluid travelling through the channel is greater than that of sea water due to very high suspended sediment concentrations. The density of a debris flow travelling in a channel can be even higher, in some cases approaching that of sediment. Explain how the size of grains entrained from the bed of a channel would be different under flow conditions ranging from just water, to hyperpycnal flow, to debris flow.

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