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荷兰Cabauw地区一个 10km× 10km区域内的四种主要土壤的水动力学参数用一种实验室直接测定法 (Wind氏蒸发法 )和两种间接方法 (“分段土壤推导函数”、“连续土壤推导函数”)确定 ,而该区域水动力学特性参数的整合则采用两组方案 (聚合土壤参数法和有效土壤参数法 )进行。一个SVAT模型的模拟输出结果———感热通量、潜热通量与实测数据的比较分析表明 :(1)对于用“分段土壤推导函数”确定的土壤水动力学参数的区域整合 ,以“逆模拟法”(有效土壤参数法 )较为可行 ,其模拟感热、潜热的精确性接近参比方案 (“模拟 平均法”) ;(2 )对于实验室直接测定的参数 ,则以几何平均vanGenuchten Mualem经验公式参数的方案 (聚合土壤参数法 )为佳 ;(3)对于“连续土壤推导函数”推导的水动力学参数 ,几何平均土壤组分方案 (聚合土壤参数法 )和“逆模拟法”方案 (有效土壤参数法 )二者均可得到优于参比方案 (“模拟 平均法”)的模拟结果 ,其中以前者最佳 ;(4 )所有区域化参数整合方案中 ,以水平几何平均区域内实验室直接测定的参数的方案最优 ;同时 ,“连续土壤推导函数”法的土壤组分几何平均方案的模型输出精确性接近该最优方案
Hydrodynamic parameters of the four major soils in a 10 km x 10 km area in the Cabauw region of the Netherlands were determined by a direct laboratory method (Wind’s evaporation method) and two indirect methods (“Sub-soil Derivation Function”, “Continuous Soil Derivation function ”), and the integration of hydrodynamic parameters in this area is carried out by two sets of schemes (the method of aggregated soil parameters and the method of effective soil parameters). The results of simulation output of a SVAT model --- sensible heat flux, latent heat flux and measured data show that: (1) For the regional integration of soil hydrodynamic parameters determined by the “piecewise soil derivation function”, “Inverse simulation method” (effective soil parameter method) is more feasible, which simulates the sensible heat and the accuracy of latent heat is close to the reference solution (“simulated average method”); (2) For the parameters measured directly in the laboratory, van Genuchten Mualem empirical formula parameters (polymerized soil parameter method) is better; (3) for the “continuous soil derivation function” derived hydrodynamic parameters, geometric average soil composition scheme (aggregate soil parameter method) and “inverse simulation method ”The results of the proposed scheme (effective soil parameter method) are better than those of the reference scheme (“ averaging method ”), of which the former is the best; (4) All the regionalized parameter integration schemes, In the meantime, the accuracy of the model output of the soil composition geometric averaging scheme of “continuous soil derivation function” approach is close to that of the optimal scheme