A coupled numerical simulation method for water ice and sand based on river ice dynamics

Abstract

The invention relates to a numerical simulation method based on river ice dynamics coupled with water, ice and sand, including: input of basic conditions, operation of a non-constant water flow module based on finite elements, calculation of hydraulic elements, update of riverbed topographic information, and calculation to obtain The hydraulic elements and updated riverbed terrain information are transmitted to the glacier movement module, the calculation and update of each glacier element under water and sediment conditions, the calculated glacier elements and updated riverbed topographic information are fed back to the unsteady water flow module to update the hydraulic elements, and the calculations are performed sequentially. Coupling time hydraulic elements, ice elements and river bed topography information until the end time. The method of the invention can accurately simulate unsteady water flow changes, river ice dynamic process, non-uniform sediment movement and river bed scour-silting changes, and can be widely used in the research of river ice problems in high-latitude rivers. Compared with the traditional river dynamics model, the simulation method can be applied to the study of water ice and sand problems in different rivers and different seasons, and has a wider scope of application.

Description

technical field [0001] The invention relates to a water ice-sand coupling numerical simulation method based on river ice dynamics, which is a water conservancy engineering method and a method for simulating the interaction of water ice and sand in a river by using a computer based on actual technical data. Background technique [0002] All high-latitude rivers are affected by seasonal river ice. The river ice process under low temperature conditions in winter not only causes changes in river channel resistance, induces ice floods, but also significantly affects river sediment transport capacity and channel evolution. Affected by the low temperature in winter at high latitudes, as the river water body continues to lose heat, changes such as ice flowers, drift ice and ice sheets appear in the river. Ice flakes and drift ice will dissipate the kinetic energy of the water body, thereby affecting the sediment-carrying capacity of the river and the evolution of the river channel i...

AI Technical Summary

Problems solved by technology

These studies have the following limitations: first, the influence of winter freezing process on river flow, sediment transport, and river bed evolution in northern rivers is ignored, and cannot accurately reflect the change of river channels in different seasons; Changes in sediment concentration and riverbed erosion under extreme conditions such as dams are not conducive to the prevention and mitigation of river disasters, and cannot meet the safety requirements of winter water delivery for northern rivers; third, the influence of river ice on the kinetic energy and potential energy of the water body cannot be accurately calculated The change of water level under the influence of river ice cannot correctly evaluate the sediment transport and river bed erosion and deposition laws during the glacial period.

The traditional river dynamics model cannot consider the unique seasonal river ice process of northern rivers, and cannot simulate the complex water-ice-sand coupling in actual engineering

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