| Comparison analysis of Philip model and Green-Ampt infiltration model under condition of added γ-PGA |
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| DOI：10.7606/j.issn.1000-7601.2017.03.12 |
| Key Words: γ-poly glutamic acid Philip model Green-Ampt model soil water infiltration |
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| Abstract: |
| The application of γ-poly glutamic acid is gradually budding in water-saving irrigation, because of aggravating drought and severe soil degradation. Based on the vertical one-dimensional infiltration experiment in laboratory, analyzed the effect of γ-PGA on soil water infiltration and carried out the comparative analysis of Philip model and Green-Ampt infiltration model. The results indicated that: Compared with the control group as the treatment of no added γ-PGA, both the cumulative infiltration volume and infiltration rate total presented a monotonic decreasing trend along with increasing γ-PGA amount. The fitting results by two infiltration models were showed that: The suction and infiltration rate was presented a decreasing trend in Philip formula. The saturated hydraulic conductivity, the product by saturated hydraulic conductivity with soil water suction total presented a decreasing trend, but the soil water suction was no obvious change in Green-Ampt formula. Moreover, the results of comparison analysis by Philip model and Green-Ampt infiltration model were indicated that: The consistency of fitting parameters and calculating parameters were good in Philip model, but the consistency of parameters in Green-Ampt model was poor. The coincidence degree of the cumulative infiltration volume calculated by Philip model parameter with the measured cumulative infiltration volume was high, the root mean square error was less than 0.5. But the coincidence degree of the cumulative infiltration volume calculated by the Green-Ampt model parameters with the measured cumulative infiltration volume was poor, the root mean square error was large than 0.5. It was explained that using the Philip infiltration model should be more accurate to determine the infiltration parameters under the conditions of added γ-PGA. |
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