基于下垫面特征的包气带厚度估算及水文模拟

Estimating the Thickness of the Air Envelope Based on Subsurface Characteristics and Hydrological Simulation

从新安江模型中的包气带厚度的物理意义出发,考虑土地覆盖因素、地形坡度因素、土壤质地结构因素以及气候条件等因素,分别采用了土地覆被相关法、地形指数回归法以及综合要素法对研究区域的包气带厚度进行了估算。据此计算模型参数流域自由水蓄水容量,并在金沙江下游横江流域进行模拟对比试验。相比之下,综合要素法能更为准确的计算出特定空间尺度下的包气带厚度,模型模拟效果更好,更适用于此区域的模型参数定量计算及水文模拟。

Based on the physical significance of the unsaturated zone depth in the Xin’an Jiang model,we estimated the unsatu⁃rated zone depth by considering the land cover factor,the topographic slope factor and the soil texture structure factor and the climatic conditions,using the land cover correlation method,the topographic index regression method and the integrated elements method.Accordingly,the free water storage capacity of the model parameter basin was calculated and simulated in the Hengjiang River basin of the lower Jinsha River for comparison.In contrast,the integrated element method can calculate the thickness of the air pocket at a specific spatial scale more accurately,and the model simulation is more effective and suitable for quantitative calculation of model parameters and hydrological simulation in this region.