Method for determining frictional monthly minimum dredging amount of estuary deep-water channel

The invention discloses a method for determining the frictional monthly minimum dredging amount of an estuary deep-water channel. The method comprises the following steps that: S1) determining the reference water depth value of the minimum dredging amount: Hi is greater than or equal to H'i and is equal to Hc+a, wherein Hi is the water depth of a dredging unit I, H'i is dredging reference water depth, Hc is water depth corresponding to a channel maintenance standard, and a is reserved water depth set for guaranteeing that the channel meets a navigation standard; S2) at the beginning of each month, giving month beginning channel bed surface water depth; S3) simulating and giving the siltation intensity and the month end prediction channel bed surface of the channel dredging unit of the calculated month; and S4) carrying out statistics on the minimum dredging total amount Fmin and the channel unit distribution Fmin=sigma i=1[(Hc+a)-(Hi0-deltaHi)]*Ai of the calculated month, wherein nis a dredging unit number, A