Method for creating three-stage flow passage of meandering riverway in lower Yellow River

The invention relates to a method for creating a three-stage flow passage of a meandering riverway in the lower Yellow River, of which the International Patent Classification (IPC) is E02B1/00 and E02B3/02. The method comprises the following steps of: constructing a control-guide engineering dam which comprises spur dikes made of waterproof earth-rock dams according to the radius of a river bend at the outermost side of a main design riverway; constructing a submerged dam at the chuting section at the tail part of the control-guide engineering dam, wherein the crest elevation is equal to the regulated-flow water level, and the top of the submerged dam is provided with a scour prevention facility; and distributing permeable pile dam at the two sides in a medium-size channel of a straight river section between two bends, wherein the crest elevation of the pile dam is the same as the water level with the local flow of 800m3/s. The three-stage flow passage created by the method can control the river pattern flow passages in different states of the small-size flow passage, medium-size flow passage and flood period, realize the river stability, enhance the capabilities of releasing flood and transferring sands in the riverway, and prevent the Yellow River levee from avulsion, breakdown and other dangerous situations, thereby achieving the goal of the comprehensive treatment of the riverway in the lower Yellow River.