SCE-UA算法在TOPMODEL参数优化中的应用

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.

Application of SCE-UA algorithm to optimization of TOPMODEL parameters

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.