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| Simulation of infiltration of soil after mixed with different components of gravels |
| Wu Haijiao1, Hu Zhenhua1, Li Fei2, Wang Zhen1 |
1.Forestry College, Shanxi Agricultural University, 030801,Taigu,Shanxi,China;
2.Water Conservancy Bureau of Jinzhong Municipality,030600,Yuci, Shanxi,China |
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Abstract There are often different sizes of gravels in mining waste land, and their presence changes the physical characteristics of the soil, leading to the difference in infiltration. With three different sizes (1.30 -1.70, 2.30 -2.80 and 3.90 -4.30 cm), five different proportions (0, 15%, 30%, 45% and 60%) of gravels mixed with soil as materials, their infiltrations were studied. Results are shown as follows. 1) When gravels were mixed with soil, with the increase their proportion, the values of initial infiltration rate and steady infiltration rate of the mixture increased, while the stable infiltration time reduced, illustrating that the addition of gravels is in favor of soil water infiltration and stable infiltration. 2) As the size of particles was not uniform, the size distribution of medium particles was better than that of bigger particles or smaller particles, the initial infiltration rate of that mixed with medium particles was the largest, and the stable infiltration time was the longest. 3) By fitting the experimental data with the Kostiakov formula and universal empirical formula, we found that both of them can better express the experimental infiltration process. A further comparison showed that the universal empirical formula is more suitable for simulating the infiltration process of the experimental earth-rock mixture. The results would serve as a reference for forecasting runoff and soil erosion in mining area.
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Received: 18 September 2013
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