不同目标函数对水文模型模拟效果影响研究
发布时间：2018-08-30 09:09
【摘要】：水文模型的模拟效果与目标函数的选取直接相关,最常用的目标函数是纳什系数。纳什系数存在不足之处,因此产生了纳什系数的变形形式,主要包括对数形式、开方形式、绝对值形式和相对值形式。目前,不同目标函数(如纳什系数及其变形形式)对模拟效果影响的研究相对较少。以黑河流域上游为研究区,应用FLEX-Topo水文模型、采用MOSCEM-UA参数优化算法,通过设定不同的目标函数,从纳什系数、相关系数、平均绝对误差和平均值之差4个数值指标评估模拟效果,从而揭示各变形形式对整体模拟效果的影响。结果表明:(1)4种纳什系数变形形式的模拟结果中,开方形式的模拟效果最好;(2)以纳什系数为目标函数的模拟结果会高估洪峰流量,而以变形形式的模拟结果略好,但都会低估基流流量;(3)目标函数分别为纳什系数和开方形式的模拟结果相差不大,但开方形式对洪峰流量的模拟略好,且相关系数更高。黑河流域的水文模拟建议采用开方形式。
[Abstract]:The simulation effect of hydrological model is directly related to the selection of objective function, and the most commonly used objective function is Nash coefficient. Because of the deficiency of Nash coefficient, the deformation form of Nash coefficient is produced, including logarithmic form, square form, absolute value form and relative value form. At present, the effect of different objective functions (such as Nash coefficient and its deformation form) on the simulation effect is relatively few. Taking the upper reaches of Heihe River Basin as the study area, using FLEX-Topo hydrological model and MOSCEM-UA parameter optimization algorithm, by setting different objective functions, from Nash coefficient, correlation coefficient, The difference between the mean absolute error and the average value is four numerical indexes to evaluate the simulation effect, so as to reveal the influence of different deformation forms on the overall simulation effect. The results show that: (1) the results of the four kinds of Nash coefficient deformation form are the best, (2) the simulation results with Nash coefficient as the objective function will overestimate Hong Feng's flow rate, while the result of deformation form is better. (3) the simulation results of the objective function of Nash coefficient and square form are not different, but the square form of Hong Feng flow simulation is better, and the correlation coefficient is higher. The hydrological simulation of Heihe River Basin is suggested to be in the form of prescription.
【作者单位】： 北京林业大学自然保护区学院;亚利桑那州立大学;南方科技大学环境科学与工程学院;
【基金】：国家自然科学基金项目(91325302,91425303)
【分类号】：P333
本文编号：2212629
[Abstract]:The simulation effect of hydrological model is directly related to the selection of objective function, and the most commonly used objective function is Nash coefficient. Because of the deficiency of Nash coefficient, the deformation form of Nash coefficient is produced, including logarithmic form, square form, absolute value form and relative value form. At present, the effect of different objective functions (such as Nash coefficient and its deformation form) on the simulation effect is relatively few. Taking the upper reaches of Heihe River Basin as the study area, using FLEX-Topo hydrological model and MOSCEM-UA parameter optimization algorithm, by setting different objective functions, from Nash coefficient, correlation coefficient, The difference between the mean absolute error and the average value is four numerical indexes to evaluate the simulation effect, so as to reveal the influence of different deformation forms on the overall simulation effect. The results show that: (1) the results of the four kinds of Nash coefficient deformation form are the best, (2) the simulation results with Nash coefficient as the objective function will overestimate Hong Feng's flow rate, while the result of deformation form is better. (3) the simulation results of the objective function of Nash coefficient and square form are not different, but the square form of Hong Feng flow simulation is better, and the correlation coefficient is higher. The hydrological simulation of Heihe River Basin is suggested to be in the form of prescription.
【作者单位】： 北京林业大学自然保护区学院;亚利桑那州立大学;南方科技大学环境科学与工程学院;
【基金】：国家自然科学基金项目(91325302,91425303)
【分类号】：P333
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