摘要
为精确模拟流域降雨成洪过程,该文引入了一套基于二维动力波方法的耦合了水文及水动力过程的数值模型。模型采用二阶Godunov格式的有限体积法来保证计算精度并采用GPU加速技术提高了运算效率。通过模拟理论流域、试验流域和实际流域的雨洪过程,发现对于特征简单的小流域及地形复杂范围较广的实际流域,模型模拟流量过程、洪峰流量及水位过程与已有解析解或实测结果吻合度均较高。同时应用GPU加速技术有效解决了动力波方法计算量大的问题,在PC机上仅用了51min便完成了具有56万个计算单元的研究流域内一场16h洪水过程的模拟计算。可见该模型是研究流域雨洪过程的理想工具,能够为洪水形成机理的研究及洪涝灾害管理工作提供技术支持。
Model is within the framework of the second order Godunov-type finite volume scheme to preserve the accuracy of the simulation and employs graphic processing units (GPU)computing technique to accelerate the calculation.After validated by theoretical catchment,test catchment and actual catchment,the results indicate a good agreement between the simulated flow process,flow peak andwater level change process and the analytical or the measured results for small catchment with simple features and actual catchment with large areas of complex terrain.It also effectively solves the problem of large heavy computation burden of dynamic wave method,it taking only 51 minutes on PC machine to calculate a 16h flood process with 560thousand computing units.It is proved that this model is an ideal tool for the rainfall-runoff process simulation in catchment,helping flood mechanism study and flood management.
作者
刘菲菲
侯精明
郭凯华
李东来
许苏秦
张现国
LIU Fei-fei;HOU Jing-ming;GUO Kai-hua;LI Dong-lai;XU Su-qin;ZHANG Xian-guo(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi'an University of Technology,Xi'an 710048,China;Sanmenxia Reservoir Area Hydrology &Resources Bureau of Yellow River Management Committee,Sanmenxia 472000,China;BEIJING CAPITAL co.,LTD,Beijing 100028,China)
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2018年第6期778-785,共8页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金资助(19672016
41330858)
西咸新区海绵城市基础研究资金资助(2018610002000097)~~
关键词
雨洪过程
动力波方法
数值模拟
GPU加速计算
rainfall-runoffprocess
dynamic wave method
numerical simulation
GPU accelerated calculation
