基于孔隙分形维数的土壤大孔隙流水力特征参数研究

根据数字图像制备分析技术得到大孔隙数目、大小和形状等特征数据,用分形理论计算孔隙分形维数,并对两类不同质地土壤的孔隙分形维数进行分析比较,应用基于孔隙分形维数的大孔隙分形模型,建立了土壤水分特征曲线和非饱和导水率的预测模型。结果表明,孔隙分形维数D_v可定量描述不同质地土壤结构,其模型预测精度优于颗粒大小分布估计的分形模型,可用于实际问题的研究。

Hydraulic characteristic parameters of macrospore flow based on spacing fractal dimension

According to the characteristic data such as the number,size and shape of the macrospore through the digital image purchase and analysis technique,the pole fractal dimensions of the two different textures are calculated and compared by using the fractal theory.The predicting model of soil moisture characteristic curve and non-saturation hydraulic conductivity are obtained by using the macrospore fractal model.The results show that the pole fractal dimension D_v can describe the soil structure of the different textures,and the model based on it produces better results compared with those of the fractal model obtained from the particle size distribution estimation.