双层异步迭代洪水演进模拟算法

发布时间：2018-05-04 07:34

  本文选题：洪水演进 + 双层异步迭代　； 参考：《武汉大学学报(信息科学版)》2016年12期

【摘要】：均一化迭代是基于栅格数据的洪水演进模拟常采用的迭代策略,存在设定迭代步长与栅格单元实际所需时间不一致的问题,直接影响到栅格单元水位、流量的计算精度。针对该问题,提出了一种双层异步迭代策略。外层迭代控制洪水演进时刻,内层迭代则通过分析不同栅格单元洪水的流速特征,实现迭代步长及迭代次数的自适应设定。采用商用FloodArea软件、均一化迭代算法及双层异步迭代算法,分别对福建省万安流域暴雨洪水历史数据进行模拟。该算法模拟结果的平均误差比FloodArea小0.361m,比均一化迭代算法小0.654m,说明该算法能有效提高洪水演进模拟的整体精度。
[Abstract]:Homogenization iteration is an iterative strategy commonly used in flood routing simulation based on grid data. There is a problem that the iteration step size is not consistent with the actual time required by the grid unit, which directly affects the calculation accuracy of the water level and discharge of the grid cell. To solve this problem, a double-level asynchronous iterative strategy is proposed. The outer iteration controls the flood routing time, and the inner iteration adaptively sets the iteration step and iteration times by analyzing the flood velocity characteristics of different grid units. Using commercial FloodArea software, uniform iterative algorithm and two-layer asynchronous iterative algorithm, the historical data of torrential rain and flood in Wanan basin of Fujian Province are simulated respectively. The average error of the simulation results is 0.361m less than that of FloodArea and 0.654m smaller than that of homogeneous iterative algorithm, which shows that the algorithm can effectively improve the overall accuracy of flood routing simulation.
【作者单位】： 中国地质大学(武汉)信息工程学院;内蒙古自治区航空遥感测绘院;
【基金】：国家自然科学基金(41501584)~~
【分类号】：P333.2
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本文编号：1842149