基于陆面水文耦合模型CLHMS的黄河源区水循环模拟与分析

Simulation and Analysis of Yellow River Source Area of Hydrological Cycle Based on Land Surface Hydrologic Model CLHMS

以黄河源区作为研究对象,建立适合于黄河源区的大尺度陆面水文耦合模式,并利用该模式开展1971-2014年该流域水文水循环过程的数值模拟,通过干流主要水文站流量资料对模型的模拟精度进行率定和验证。分析结果表明,模型模拟的水量平衡系数接近于1,Pearson相关系数高于0.85,而纳什效率系数高于0.72,因此模式对流量峰值的模拟能力有待提高。模式模拟水循环主要要素的时空分布有较高的精度和准确性,因此该模式适用于黄河源区水文循环模拟。

Setting the Yellow River source area as the research area,a macro-scale land surface hydrological model is established. The model is then applied to carry out numerical simulations of hydrological cycle in the basin between 1971 and 2014. Simulation accuracy is calibrated and validated by using discharge data from main gauging stations located at main streams. The results of simulations indicate that,water balance coefficient is close to 1,and correlation coefficient is higher than 0.85,with Nash efficiency factor higher than 0.72. Therefore,the capacity of the model to simulate peak flows is yet to be improved. While the spatial and temporal distribution of the main elements of hydrological cycle simulated has a relatively high precision and accuracy,this model can be applied to simulate hydrological cycle in the Yellow River source area.