Budyko-Fu模型下气候季节性指标中水热变化时相差的选取研究

常斐杨; 刘文兆; 周海香; 宁婷婷

Selection of time-phases of water and heat in climate seasonality indexes under Budyko-Fu model

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DOI：10.7606/j.issn.1000-7601.2019.03.27

Key Words: Budyko-Fu equation climate seasonality index time-phase of water-heat streamflow catchment water balance

Author Name	Affiliation
CHANG Fei-yang	Institute of Soil and Water Conservation，Northwest A&F University，Yangling，Shaanxi 712100，China
LIU Wen-zhao	Institute of Soil and Water Conservation，Northwest A&F University，Yangling，Shaanxi 712100，China Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau，Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources，Yangling，Shaanxi 712100，China
ZHOU Hai-xiang	Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau，Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources，Yangling，Shaanxi 712100，China
NING Ting-ting	Key Laboratory of Ecohydrology of Inland River Catchment，Northwest Institute of Ecology and Environmental Resources, Chinese Academy of Sciences，Lanzhou，Gansu 730000，China

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Abstract:

Budyko models have been widely used in studying the catchment water-heat coupling process in recent years，among which Budyko-Fu model received greater attentions. Taking Jinghe River on the Loess Plateau as an example，the relationship between the controlling parameter，ω，in Budyko-Fu model and three climate seasonality indexes were analyzed in this study. The three climate seasonality indexes included SI1-considering the monthly precipitation departure in a year，SI2-considering the amplitude difference between seasonal variations of precipitation and potential evapotranspiration by sinusoidal simulation，and SAI-considering the time-phase differences between seasonal variations of precipitation and potential evapotranspiration on the basis of SI2. Then，the impact of time-phases change of both precipitation and potential evapotranspiration on the calculation of SAI was discussed，so there were two indexes，SAI1 and SAI2. Further，the effects of different climate seasonality indexes on streamflow simulation were compared. The results showed that in the analysis of catchment water-heat coupling process，the SAI2 performed well，in which the time-phases of water-heat seasonality were determined by the mean annual precipitation and potential evapotranspiration and remained unchanged from year to year. The coefficient of determination (R²) in the semi-empirical equation of ω given by SAI2 and NDVI was 0.746. The simulation accuracy of annual streamflow using this equation was also improved.