摘要
选择7种水文模型分别在中国北部3个半湿润流域做模拟对比,分析不同水文模型在各流域的适用性,并使用贝叶斯模型平均法对不同模型集合,比较各种集合方法的优势,研究贝叶斯模型平均法的应用效果.研究结果表明,以蓄满产流模式为主的模型在半湿润流域应用效果较好,针对不同流域特点对传统模型进行改进可以提高模拟精度.贝叶斯模型平均法能提供较好的确定性预报结果和概率预报结果,仅对少数模拟效果好的模型进行集合,并不能有效提高预报精度,适当增加参与集合的模型数量能使贝叶斯模型平均法更好地综合各模型优势,提高预报结果的精度.
Watershed hydrological simulation is a measure to simulate the real world hydrological processes based on hydrological models. A large number of conceptual hydrological models have been invented driven by different generalizations of the identical hydrological process. The advantages of different models can be investigated by comparison of different hydrological models. Ensem-ble forecasting is a means that integrates several model results to obtain more reliable and stable predictions. Arithmetic Mean, W’eighted Averaging and Bayesian Model Averaging are three common ensemble forecasting methods. In this study, seven hydrologi-cal models were applied and compared in three semi-humid watersheds in the northern China to explore the applicability of different models in each watershed. Bayesian Model Averaging scheme were used to integrate these models to compare the advantages of d if-ferent combinations, and the application effect o f Bayesian Model Averaging scheme was studied. The results show that models with saturation-excess mechanisms have a good simulation effect in semi-humid watersheds. Traditional models are improved based on the characteristics of different watersheds, and the accuracy of simulation is higher after improvement. The certainty forecasting re-sults and probabilistic forecasting results are provided by Bayesian Model Averaging scheme. The integrated result of few good- simu-lated models shows poor stability. Bayesian Model Averaging scheme can take advantages of each model efficiently and provide high-precision forecasting results by increasing the number of integrated models properly.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2017年第6期1491-1501,共11页
Journal of Lake Sciences
基金
国家自然科学基金项目(41130639
51179045)
水利部公益项目(201501022)联合资助
关键词
半湿润流域
水文模拟
模型对比
贝叶斯模型平均法
Semi-humid watershed
hydrological simulation
models comparison
Bayesian Model Averaging
