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Defining Geometric Similarity in Soils

^a Agricultural and Food Engineering Dep., Indian Institute of Technology, Kharagpur, India 721302
^b Dep. of Geography and Environmental Engineering, Johns Hopkins Univ., Baltimore, MD 21218-2686
^c School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-2051

View larger version (30K): [in a new window]   Fig. 1. Unscaled soil water retention curves for sand (S), sandy loam (SL), loam (L), silt loam (SiL), clay loam (CL), silty clay loam (SiCL), silty clay (SiC), and all 247 soils combined together.

View larger version (20K): [in a new window]   Fig. 2. Retention parameters for seven soil textural classes (S, sand; SL, sandy loam; L, loam; SiL, silt loam; CL, clay loam; SiCL, silty clay loam; SiC, silty clay). Symbols represent estimated parameters and solid lines represent the trend lines through each textural cluster.

View larger version (16K): [in a new window]   Fig. 3. Mean ln(hm) and mean standard deviations of the pore size distribution () for seven soil textural classes. The error bars indicate the standard error for each textural class. The numbers in parentheses shown in abscissa are the number of water retention curves used in each textural class.

View larger version (35K): [in a new window]   Fig. 4. Scaled water retention curves along with their reference retention curve for sand (S), sandy loam (SL), loam (L), silt loam (SiL), clay loam (CL), silty clay loam (SiCL), silty clay (SiC), and all soils combined together.

View larger version (18K): [in a new window]   Fig. 5. Coefficient of variation CV (%) of sample standard deviations for the pore radii distribution function and the RMSE for each soil texture. The numbers in parentheses shown in abscissa are the number of water retention curves used in each textural class.

View larger version (22K): [in a new window]   Fig. 6. Root-mean-squared errors plotted as a function of the coefficient of variation (%) of the standard deviations for the scaled WRCs representing different sub-populations of (a) all soils and (b) silt loam and silty clay loam soil.