Method for setting river movable bed hydraulic model

The invention relates to a method for setting a river movable bed hydraulic model, and belongs to the field of water conservancy. The IPC of the model is E02B 1/02; high-pressure impulsive force of a high-pressure air bag driver is utilized for enabling a sampling probe to be instantly inserted into silting sediment; meanwhile, liquid nitrogen in a liquid nitrogen container rapidly enters the sampling probe; and the fidelity sampling process of bed materials is completed. A horizontal moving mechanism arm and a vertical moving mechanical arm are adopted to move along a horizontal guide rail and a vertical guide rail respectively, and the sampling position can be precisely controlled; due to the fact that the size of the high-pressure air bag driver is fixed, the falling distance of the sampling probe can be determined by the initial position of the vertical moving mechanical arm on the vertical guide rail. Real-time fidelity sampling of a bed material cross section of the movable bed model can be achieved; meanwhile the sampling efficiency is greatly improved; and the great promotion effect on precision and perfect of test data is achieved.