摘要
现有的城市暴雨径流模型大都结构复杂、计算量大且耗时长,不利于城市洪涝快速预报预警。利用分布式水文模型的优势,以DEM数据为基础,构建栅格单元上的坡面产汇流计算模式。以英国沃夫河谷为研究典型,结合最陡坡度汇流原理、使用SCS-CN法计算产流,设计一种考虑填洼净雨损失量的坡面产汇流简易算法。经验证,模型模拟效果精度较高。使用经遗传算法率定的参数组合进行模拟,纳什效率系数达到0.8967。该模型实现了精细化下垫面的城市洪涝简易快速计算。
Most of the existing urban storm runoff models are complex in structure,intense in calculational complexity.These characteristics are not conducive to the rapid forecasting and early warning of urban flood.A surface runoff calculation model was built to combine the advantages of distributed hydrological model and DEM data.The smallest compute unit of this model is cell,which subtilize the information of underlying surface.Moreover,the rule of runoff generation and concentration was designed based on the principle of steepest slope and the SCS-CN method.An application of the model was conducted in Wharfedale in England.The simulated outflow with optimized parameters which selected by genetic algorithm fits well with the observed outflow,with the Nash efficiency coefficient reached to 0.8967.The model realizes a simple and fast calculation of flood of fine surface.
作者
张瓅丹
陈晓宏
王喻鸣
ZHANG Lidan;CHEN Xiaohong;WANG Yuming(School of Civil Engineering,Sun Yat-Sen University,Zhuhai 519082,China;Center for Water Resources and Environment,Sun Yat-Sen University,Guangzhou 510275,China;Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute,Guangzhou 501275,China)
出处
《水文》
CSCD
北大核心
2023年第6期51-57,73,共8页
Journal of China Hydrology
基金
国家自然科学基金资助项目(U1911204,51861125203)
国家重点研发计划资助项目(2021YFC3001000)。
关键词
水文模型
产汇流计算
DEM
城市洪涝
hydrological modeling
confluence calculation
DEM
urban flood
