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利用离散元法和图形处理器(GPU)并行计算手段建立泥石流运动堆积模型,以自然界沟道泥石流汇流后运动堆积特征及危险范围作为模拟参照,利用所构建的泥石流流通槽完成沟道泥石流不同交汇角汇流模拟试验和堆积危险范围预测,实现了泥石流沟道汇流的可视化模拟和数值模拟。试验结果表明,可视化模拟能够模拟出自然界中泥石流自流通区运动汇流后产生堆积的运动特征;数值模拟实现了锐角条件下仅考虑单因素即沟道交汇角对泥石流堆积危险范围影响的模拟试验。此外,利用GPU并行计算的优势可用于模拟大规模泥石流汇流现象,模型的可扩展性为泥石流汇流堆积危险范围分析向更为复杂的地理环境模拟奠定基础。
By using the discrete element method and the GPU (GPU) parallel computing method, the debris flow accumulation model is established. Taking the movement and accumulation characteristics of the channel debris flow in the nature as a model reference, the debris flows are completed by using the constructed debris flow channel. Corner current confluence simulation test and prediction of heap danger range, the visual simulation and numerical simulation of debris flow channel confluence are realized. The experimental results show that the visual simulation can simulate the movement characteristics of natural debris flow in the self-circulation area, and the simulation results show that the influence of single factor, ie, the crossing angle of the channel, on the danger zone of debris flow accumulation is achieved by numerical simulation. In addition, the advantage of GPU parallel computing can be used to simulate large-scale debris flow confluence. The scalability of the model lays the foundation for more complex geo-environment simulation for debris flow confluence and accumulation analysis.