Experimental system for water and sand movement under river network convergence region complex riverbed and simulation method of experimental system

Abstract

The invention discloses an experimental system for water and sand movement under a river network convergence region complex riverbed and a simulation method of the experimental system. The system structurally comprises a main stream water tank, a tributary water tank, a water tank downstream area, an upstream A water box, an upstream B water box, a downstream water box, an A water pumping pipeline, sand adders and a B water pumping pipeline, wherein the upstream of the main stream water tank is communicated with the upstream A water box, the upstream of the tributary water tank is communicated with the upstream B water box, the upstream A water box and the downstream water box are communicated with each other through the A water pumping pipeline to achieve water flow circulation, the upstream B water box and the downstream water box are communicated with each other to achieve water flow circulation, the A water pumping pipeline is provided with an A electromagnetic flowmeter, an A valve, and an A variable frequency pump, the B water pumping pipeline is provided with a B electromagnetic flowmeter, a B valve and a B variable frequency pump, the main stream water tank is provided with an A sand adder, and the tributary water tank is provided with a B sand adder. The experimental system for the water and sand movement under the river network convergence region complex riverbed and the simulation method of the experimental system have the advantages that simulation and observation of flow, sediment movement and bed surface form change of complex riverbeds like dells and longitudinal dunes of river network convergence regions are achieved.

Description

technical field [0001] The invention relates to an experimental system and a simulation method for water and sand movement under a complex river bed in a river network confluence area, and belongs to the field of river dynamics science and technology. Background technique [0002] The economy in the eastern plains of my country is developed and the population is large, but the pollution of rivers and lakes is serious, coupled with the staggered rivers, insufficient hydrodynamic force, poor self-purification ability, severe water security situation, and serious threats to people's water security; The water security of the river network has attracted much attention; the river network confluence in the plain area is an important control node for the confluence, mixing, transport and enrichment of pollutants in the river network water body. It is of great significance to ensure the water safety of the eastern river network in my country. [0003] The main driving forces of pollut...

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Problems solved by technology

[0003] The main driving forces of pollutant transport include convection and turbulent diffusion; however, the "deep pit-sand ridge" bed surface at the intersection has a special shape, the water flow structure is complex, the turbulence is strong, and the convective characteristics are unknown; at the same time, the sediment in the plain area is more It is fine and rich in sticky sand, which has a strong adsorption and desorption effect on pollutants, so sediment movement also plays an important role in the enrichment of pollutants and secondary pollution of water bodies; The law of water and sand movement in the river network is the premise of revealing the law of pollutant transport at the river network intersection; due to the difficulties in the formation, stabilization and solidification of the bed surface, the existing experimental systems and simulation methods for studying the water and sand movement at the river network junction are mainly It does not consider the movement of water and sand under the shape of the bed surface, and the obtained research results also deviate from the actual situation. Therefore, there is an urgent need for an experimental simulation system and simulation method for the movement of water and sand under the complex riverbed in the river network confluence area.

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