Simplified Relation Model of Soil Saturation Permeability Coefficient and Air-Entry Value and Its Application
| Autor: | Yi Li, Zhijia Wu, Heming Dong, Wentao Li, Gaoliang Tao |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Statistics and Probability
Pore size QA299.6-433 model comprehensive proportionality constant saturated permeability coefficient Statistical and Nonlinear Physics Soil science Permeability coefficient Soil type Soil saturation Loam maximum pore Soil water QA1-939 Thermodynamics QC310.15-319 Saturation (chemistry) Value (mathematics) air-entry value Mathematics Analysis |
| Zdroj: | Fractal and Fractional, Vol 5, Iss 180, p 180 (2021) Fractal and Fractional Volume 5 Issue 4 |
| ISSN: | 2504-3110 |
| DOI: | 10.3390/fractalfract5040180 |
| Popis: | Based on the Tao and Kong (TK) model and the fractal model of the soil–water characteristic curve, a simplified model of the relationship between the saturated permeability coefficient and the air-entry value is established in this study: ks = k0ψa−2. It is shown that the saturated permeability coefficient of soil is determined by its maximum pore size. In order to facilitate the mutual prediction of saturation permeability coefficient and air-entry value, based on the data of five types of soil in the UNSODA database, the comprehensive proportionality constant k0 of the five types of soil were obtained: sand k0 = 0.03051 clay k0 = 0.001878 loam k0 = 0.001426 sandy loam k0 = 0.009301 and silty clay loam k0 = 0.0007055. Based on the obtained comprehensive proportionality constant k0 and the relationship model between saturated permeability coefficient and air intake value, the air-entry value of five kinds of soils in the existing literature and the SoilVision database were calculated. Comparing the calculated air-entry value with the measured one, the results showed that the model simplifies the traditional air-entry value prediction method to some extent and can effectively predict the air-entry value of different types of soil. On the whole, the model better predicts the air-entry value for sandy, clay, and silty clay loam than loam and sandy loam. |
| Databáze: | OpenAIRE |
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