Method for renovating movable-bed physical model design in upper Yangtze River pebble beach dangerous sea channel

Abstract

The invention discloses a method for renovating the movable-bed physical model design in an upper Yangtze River pebble beach dangerous sea channel. The method comprises the following steps of: selecting proper model sand; determining a proper model scale; determining the geometrical morphology of the model. According to the method disclosed by the invention, the physical properties of light model sand and natural sand are compared; the motion characteristics of two model sands, i.e. the natural sand and the light sand, are compared from three aspects of sediment start, sand transmission rate and sand wave motion by a 28m flume experiment; the Chongqing urban city Zhuerqi river reach positioned on the Three Gorges varying backwater tail end is selected to research and compare the adaptation of the natural model sand and the light model sand when dredged channel scouring and siltation are simulated via the physical model experiment; the adaptation of the two types of model sand in a bed load movable-bed physical model is analyzed; the characteristics of different types of model sands are combined with the motion characteristics of the water flow and the dredged channel sediment of the upper Yangtze River pebble beach to analyze to obtain the method for renovating the movable-bed physical model design in the upper Yangtze River pebble beach dangerous sea channel.

Description

technical field [0001] The invention belongs to the technical field of river pebble research, and in particular relates to a method for designing a physical model of a dynamic bed for regulation of dangerous waterways in the upper reaches of the Yangtze River with pebbles. Background technique [0002] Due to the complexity of the movement of pebbles and gravels in rivers in natural mountainous areas, it is necessary to fully demonstrate and study the remediation plan before carrying out the remediation project. At present, for the remediation of complex pebble shoals in the upper reaches of the Yangtze River, the method of simulating the remediation effect with physical models is generally used The program was demonstrated and studied, and physical model tests of 15 shoals were carried out during the regulation of the third-level waterway of the Yibin-Chongqing section of the Yangtze River. From the perspective of engineering practice, none of the shoals were regulated after...

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Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a physical model design method for the dynamic bed of pebble beach dangerous channel regulation in the upper reaches of the Yangtze River.

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