Simulation method for barrier lake outburst process

Abstract

The invention discloses a water-sand coupling simulation method for a barrier lake outburst process, and relates to the field of water disaster prevention. The method comprises the steps of adopting acomplete water-sand coupling control equation to describe the barrier lake breach forming and developing process; solving the complete water-sediment coupling control equation by adopting a finite volume method in a high-precision MUSCL-TVD-HLLC format: reconstructing an interface Riemann value variable through MUSCL to enable the interface Riemann value variable to reach second-order precision,inhibiting numerical oscillation through a TVD algorithm, and calculating Riemann flux by adopting HLLC; discretizing terrain source items through a local terrain correction and water depth reconstruction technology; discretizing resistance source items by adopting an implicit method; and processing gravity collapse by adopting a simple geometric method to simulate a breach broadening process. Themethod is suitable for simulating the overtopping outburst process of the natural barrage, and scientific and technological support can be provided for barrage outburst flood prediction and risk assessment.

Description

technical field [0001] The invention relates to the field of water disaster prevention, in particular to a method for simulating a barrier lake burst process. Background technique [0002] The barrier dams formed by earthquakes, rainstorm-induced collapses, and landslides blocking rivers are usually formed by the accumulation of loose earth and rocks, and most of them are in danger of overflowing and collapsing. There are more than 400 recorded barrier lakes in my country, about 85% of which occur in the upper reaches of the Yangtze River and the rivers in the southwest. At present, under the multiple influences of earthquakes, climate change and human activities, the frequency of barrier lake breaches has increased significantly. Once the barrier dam breaks, it will cause extreme floods. For example, in 2000, the Yigong barrier lake in Tibet had a maximum instantaneous flow of 120,000m 3 / s; In 2008, the peak discharge of the Tangjiashan barrier lake burst flood reached 6...

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Problems solved by technology

The fourth assumption is that part of the model adopts the assumption of uniform flow on the backflow surface. However, both the laboratory tank test and the field observation of the barrier dam show that traceability scour is an important mechanism of breach formation, and the time of breach and the process of breach flow have important effects, so this assumption does not apply in the vast majority of cases

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