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鉴于糙率的选取是河网数值模拟结果准确与否的关键,以清河某河段为例,采用MIKE 11软件进行一维河网水力计算,对比分析了河道水位实测值与计算值,确定了合理的模型参数及边界条件,进而在保持其他条件不变的情况下,通过改变主河槽糙率值,采用摩尔斯分类筛选法进行糙率局部灵敏度分析,计算得出灵敏度判断因子为1.14,表明糙率在数值模型计算中为高灵敏参数。
In view of that the selection of roughness is the key to the accuracy of the numerical simulation of river network, taking a river section of Qinghe River as an example, the hydraulic calculation of one-dimensional river network is carried out with MIKE 11 software. The measured and calculated values of river water level are compared and analyzed Reasonable model parameters and boundary conditions, and then under the condition of other conditions remain unchanged, by changing the roughness value of the main channel, the use of Morse classification screening method for local sensitivity analysis of roughness, the calculated sensitivity to determine the factor of 1.14, indicating Roughness is a highly sensitive parameter in numerical model calculations.