摘要
本文以长江中游螺山—汉口河段为例,采用MIKE11模型进行一维河网水力计算,通过对比分析河道的模拟水位值与实测水位值,确定了糙率n=0.025及合理的模型边界条件。利用Morris筛选法,分析MIKE11模型的糙率灵敏度,计算结果表明,糙率在枯水期、平水期、丰水期的灵敏度都比较接近,但在丰水期的水位变幅要高于平水期和枯水期,枯水期和平水期的水位比较接近。本文以20000m^(3)/s流量为临界流量,根据流量的大小调节糙率。模拟结果表明,通过流量大小来调节糙率这种方式可以优化糙率的选取,提高模型计算精度。
Taking the Luoshan-Hankou reach of the middle reaches of the Yangtze River as an example,the MIKE11 model is used for one-dimensional river network hydraulic calculation.By comparing and analyzing the simulated water level and the measured water level of the river,the roughness n=0.025 and the reasonable boundary conditions of the model are determined.Morris screening method is used to analyze the roughness sensitivity of MIKE11 model.The calculation results show that the sensitivity of roughness in dry season,normal season and wet season is relatively close,but the water level variation in wet season is higher than that in normal season and dry season,and the water level in dry season and normal season is relatively close.This paper takes the 20000m^(3)/s flow rate as the critical flow rate,and adjusts the roughness according to the flow rate.The simulation results show that this method can optimize the selection of roughness and improve the calculation accuracy of the model.
作者
王玉
王敏
WANG Yu;WANG Min(River Department,Yangtze River Scientific Research Institute,Wuhan 430010,China)
出处
《水利建设与管理》
2023年第8期60-64,75,共6页
Water Conservancy Construction and Management
