珠江流域大尺度陆面水文耦合模式的构建及应用

Development of Large Scale Coupled Land Surface and Hydrologic Model System and Its Application in Pearl River Basin

以珠江流域为研究对象，通过更新陆面水文模式所需的下垫面参数数据库，建立适合于珠江流域的大尺度陆面水文耦合模式系统，并利用该模式开展了1963～2006年流域水文水循环过程的数值模拟，通过与实测流量比较，系统考察了陆面水文耦合模型对珠江流域水循环各分量的模拟性能。分析结果表明，该陆面水文耦合模式对珠江流域年平均各水循环要素具有良好的模拟能力；模式对珠江流域干流主要控制水文站的月平均流量也有较高的模拟精度，模式模拟的水量平衡系数均接近1，相关系数均高于0．84，IOA相似度系数均高于0．9；相对而言，模式对流量峰值的模拟能力还有待提高。

In this paper, we updated the digital watershed data set of a coupled land surface and hydrologic model system （CLHMS） for the Pearl River Basin. The water cycle process of the Pearl River Basin during 1963-2006 was simulated using CLHMS. We evaluated the simulation ability of each water cycle component with the measured stream flow. The results show reasonable inter- annual responses of dominant water cycle components and good skills in simulating the monthly river flow of main stream. The wa- ter balance indexes （WBI） are close to 1, the Pearson correlation coefficient （PMC） are above 0.84,the IOA similarity coefficient are above 0.9, the skill of peak flow simulation still need to be improved.