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《Chinese Journal of Atmospheric Sciences》 2013-05
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Calibration of Parameters in Soil Moisture Equation with Shuffled Complex Evolution Algorithm

LI Deqin;ZHANG Shuwen;DUAN Yunxia;CUI Jin;Institute of Atmospheric Environment,China Meteorological Administration;Key Laboratory for Semi-Arid Climate Change of the Ministry of Education,Lanzhou University;Shenyang Meteorological Service;  
In this study,by using an observing system simulation experiment,a shuffled complex evolution algorithm(SCE-UA) is evaluated in terms of the effectiveness and efficiency of calibrating parameters in one-dimensional Richards equation,including soil components and all physical parameters.The result shows that the ability of calibrating parameters with SCE-UA depends on not only the uncertainty ranges of parameters but also their sensitivity degrees.For sensitive parameters,unique optima parameter estimates can be easily obtained.However,for insensitive ones,there exists an "insensitive range",and only suboptimal parameters are obtained in this range.By increasing training times and reducing the parameters' range,the performance of parameter calibration in the insensitive range can be improved.Moreover,the overdetermination of the model parameters may result in suboptimal parameter estimates,and a good calibration effectiveness can be archived by appropriately setting parameters and adding constrains and criterions.
【Fund】: 国家自然科学基金资助项目41105064、41075074;; 半干旱气候变化教育部重点实验室(兰州大学)开放基金;; 公益性行业(气象)科研专项GYHY201006016
【CateGory Index】: S152.71
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