SCE-UA算法在TOPMODEL参数优化中的应用

Application of SCE-UA algorithm to optimization of TOPMODEL parameters

以江西修水万家埠流域为例,用SCE-UA算法对TOPMODEL参数进行了优化,并对优化结果进行了检验.结果表明:SCE-UA算法不仅可以用于概念性水文模型和分布式水文模型,还可以用于半分布式水文模型———TOPMODEL;TOPMODEL参数上下边界需根据参数的物理意义和研究流域特性来确定;在SCE-UA算法中,目标函数的建立对于参数优化具有重要作用,在次洪模拟时,目标函数应突出高水过程和洪峰对模拟效果的影响;SCE-UA算法的绝大部分参数取值都可以采用已有研究成果的默认值,只有复合型个数p需要根据具体问题确定.

A case study was performed for Wanjiabu catchment of Jiangxi Province, and the result of parameter optimization by use of SCE-UA algorithm shows that the algorithm is applicable not only for the conceptual hydrological model and distributed hydrological model, but also for the semi-distributed hydrological model TOPMODEL. The upper and lower boundaries of TOPMODEL parameters should be determined according to their physical meanings and the characteristics of the catchment to be studied. In SCE-UA algorithm, the establishment of the objective function is important for parameter optimization, and the effects of high-water flood process and flood peak should be emphasized in the establishment of the objective function for flood simulation. Most parameters in SCE-UA algorithm can take default values from the former study, while the number of complexes should be determined based on specific issues.