Method for river dredging and management and ait construction

The invention relates to a method for dredging and management and ait construction, which belongs to the techniques of environment protection and hydraulic engineering. The method comprises the following steps of: protecting dikes along both shores of a river by a light and hard shell dike method; arranging a nose dike in the middle position of the gradually-wide section of the river along the upstream end of a longitudinally ridged sand sill; according to the shape of the sand sill, hard shell sheet piles gradually extending to the downstream along both sides of the nose dike to form an aequilate river surface; inserting sheet piles, connecting the sheet piles into a whole, throwing the dredged mud into a range surrounded by the hard shell sheet piles, and then gradually forming a man-made island; marking a helix-shaped man-made bay on the downstream of the gradually-narrow section of the river to form a fixing sand point on the sudden-widen river; and then planting and fixing sand on the man-made island. Th