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| DOI：10.13522/j.cnki.ggps.2017.12.016 |
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| The Influence of Fracture Network on Overland Flow and Water Infiltration in Soil |
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ZHU Lei, YOU Jin, CHEN Jiuhong
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School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; Efficient Use of Water Resources in Arid Modern Agriculture Ministry of Educational Engineering Research Center, Yinchuan 750021, China
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| Abstract: |
| This paper studied the impact of fracture network on overland flow and water infiltration in soil using dye tracer. By digitizing the two-dimensional dye images, we calculated the parameters related to runoff volume, infiltration volume in the absence and presence of the soil fracture network respectively. The result indicated that compared with the non-fractured soil, the fracture network reduced surface runoff coefficient and increased rainfall infiltration coefficient; the average runoff coefficient with the fracture network reduced by 0.42 and the rainfall infiltration coefficient increased by 0.53 under rainfall intensity of 50 mm/h. The average runoff coefficient with the fracture network reduced by 0.15 and the average rainfall infiltration increased by 0.38 under the rainfall intensity of 30 mm/h. Meanwhile, the fracture network increased infiltration depth and the wetting areas, compared with those in the absence of fracture network. The average rainfall infiltration depth in the presence of the fracture network increased 21.34 cm and the average wetting area increased 36.0% under a rainfall intensity of 50 mm/h, and 5.70 cm and 9.5% under a rainfall intensity of 30 mm/h. |
| Key words: fracture network; overland flow; soil water content; water infiltration in soil |
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