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| Influence of water quality on infiltration process of artificial compound soil |
| ZHANG Ruiqing1,2, HE Zhenjia3, SUN Zenghui1,2* |
| 1. Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi′an, Shaanxi 710075, China; 2. Institute of Land Enginee-ring and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi′an, Shaanxi 710021, China; 3. Shaanxi Dijian Guantian Investment Construction Co., Ltd., Baoji, Shaanxi 721001, China |
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Abstract In order to deeply analyze the impact of water quality on the infiltration characteristics of artificial compound soil, indoor soil column simulation experiments were conducted to analyze the impact of water quality on the infiltration characteristics of artificially mixed soil under seven different volume ratios(1∶0, 5∶1, 2∶1, 1∶1, 1∶2, 1∶5, and 0∶1)of a feldspathic sandstone and aeolian sandy soil under two different chemical properties of natural accumulated water and groundwater. The results show that when the artificial composite soil texture is compounded of silty loam, sandy loam, and loamy sand(ratios of sandstone to sandy soil 1∶0, 5∶1, 2∶1, 1∶1, and 1∶2), the infiltration time of the natural water accumulation is significantly longer than the infiltration time of the groundwater. When the artificial composite soil texture is loamy san and sand soil with a ratio of 1∶5 and 0∶1 for the combination of sandstone and sand, there is no significant difference in the infiltration time of the natural water accumulation and the subsurface irrigation water. Using the same water quality, the infiltration time in different ratios of compounded soils decreases from 1∶0, 5∶1, 2∶1, 1∶1, 1∶2, 1∶5, to 0∶1. Under the same sandstone and sandy soil ratio, the cumulative infiltration amount under natural water accumulation treatment is greater than that using groundwater irrigation water treatment. Moreover, the difference in cumulative infiltration is greatest when the ratio of sandstone to sandy soil is 2∶1. The fitting relationship between the cumulative infiltration amount and elapsed time is consistent with the Logarithmic infiltration model. The variation law of the advancing in wetting front migration distance is consistent with the variation laws of the cumulative infiltration. The results show that water quality significantly affects the infiltration performance of artificial compound soil, and the degree of impact is closely related to the type of artificial compound soil texture.
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Received: 19 April 2023
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