基于伪卫星测试的并行计算灾害救援中心选定模型构建

Model construction of debris flow disaster rescue center selection based on parallel computing

摘要:

泥石流具有时间和空间群发性、运动持续性、灾害链式性、类型单一性、致灾方式和受灾对象的多样性特点。灾害救援中心位置选取过程是典型的非线性不收敛问题。单纯以线性技术和约束条件为基础的模型面对复杂泥石流灾害指标的情况下，会出现较大偏差。提出基于伪卫星测试结合并行计算的灾害救援中心选定模型设计方法。以泥石流灾害为例，利用离散元法和GPU并行算法构建泥石流运动堆积模型，将沟道泥石流汇流后运动堆积特点和灾害区域当作模拟参照，对泥石流运动进行模拟，根据模拟结果，预测泥石流覆盖范围；利用伪卫星技术计算灾害扩散程度和易发点距离，在救援中心搭建费用与救援成本最低前提下，将用户选择的位置与高度作为已知条件，以期望损失最低为约束，以精度因子为标准得到救援选址的核心区域点，构建基于伪卫星测试的灾害救援中心选定模型。仿真实验表明，设计模型的选址精度和效率较高，可为泥石流灾害后及时救援提供数据支撑。

Abstract:

Debris flow has the characteristics of time and space mass occurrence, movement continuity, disaster chain, single type, disaster causing mode and diversity of disaster affected objects. The location selection process of disaster rescue center is a typical nonlinear and non convergent problem. Under the condition of complex debris flow disaster indicators, the model based solely on linear technology and constraint conditions will have large deviation. A model design method of disaster rescue center selection based on pseudolite test and parallel computing is proposed. Taking the debris flow disaster as an example, the movement accumulation model of debris flow is constructed by using the discrete element method and GPU parallel algorithm. The movement accumulation characteristics and disaster area of debris flow after the confluence of gully debris flow are taken as the simulation reference to simulate the debris flow movement. According to the simulation results, the coverage of debris flow is predicted; The pseudo satellite technology is used to calculate the degree of disaster diffusion and the distance between vulnerable points. On the premise of the lowest construction cost and rescue cost of the rescue center, the location and height selected by the user are taken as the known conditions, with the lowest expected loss as the constraint, and the precision factor as the standard to obtain the core area points for rescue site selection, and a disaster rescue center selection model based on pseudo satellite testing is constructed. The simulation experiment shows that the location accuracy and efficiency of the design model are high, which can provide data support for timely rescue after debris flow disasters...