| Dynamic effects of Super Absorbent Polymer on physical properties and water infiltration of soil |
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| DOI：10.7606/j.issn.1000-7601.2013.05.027 |
| Key Words: Super Absorbent Polymer saturated water content saturated hydraulic conductivity soil water diffusivity infiltration simulation |
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| Abstract: |
| Super Absorbent Polymer (SAP) is of important significance in mitigating agricultural drought. However, its role in water retention ultimately fades away due to its degradation after application. Therefore, the investigation of the dynamic change of soil physical properties and the mechani
sm of moisture movement caused by degradation of SAP is the key for its proper application. Based on the typical amount of SAP used in agriculture, the dynamic impacts of SAP on soil physical properties and one dimensional soil moisture were analyzed. The results showed that the attenuation of SAP performance after its application into soil was the most fundamental reason for the constant change
of soil physical properties. After treated with SAP, the saturated mass water content of soil was significantly increased, and the saturated hydraulic conductivity was reduced. However, as the SAP performance attenuated, the saturated moisture content showed a downward trend and the saturated hydraulic conductivity showed an upward trend. After treated with SAP, the water diffusivity of soil exhibited a curved surface and showed a gradually expanding trend with the attenuation of its performance. The forward speed of moist sharp point of infiltration in SAP treated soil was reduced, which was mainly because that the saturated moisture content of soil was increased and the soil pores were clogged due to the expansion of SAP after it was applied. By investigating the water diffusivity and hydraulic conductivity of SAP treated soil at different time periods, a one dimensional water movement equation was finally established. It was proved to be feasible with the accuracy within an allowable range. |
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