基于HYDRUS-3D的涌泉根灌土壤入渗数值模拟

doi:10.3969/j.issn.1674-8530.2013.06.017

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Abstract With large flow and columnar flow boundary, bubbled root irrigation is greatly different from traditional drip irrigation and infiltrating irrigation. It is therefore necessary to study water movement under bubbled root irrigation from different boundaries. Based on the theory of unsaturated soil water dynamics, combining the characteristics of soil water movement under bubbled root irrigation, an infiltration model with columnar flow boundary was established. The HYDRUS-3D software was applied to solve the model numerically. The model is validated through the contrast of measured values and simulated values of the soil moisture which change over time. The results show that the simulation results are in well agreement with measured values. The relative error between simulated and measured values is less than 10%, both of which are quite consistent. The simulation results can provide some theoretical basis for the rational design and operation of the bubbled root irrigation system. The influences on soil moisture content by dripper discharge and drivepipe opening length were studied through numerical simulation method. The results show that the rate of moisture migration increase as dripper discharge increases; the differences caused by dripper discharge decrease over time. With the same water capacity, the range of soil wetting body slightly decreases as dripper discharge increases. The increases of the opening hole areas have no significant effect on the wetting body shape and size, but it has greater influence on soil moisture distribution.

Key words： bubbled root irrigation column infiltration soil water movement soil moisture content numerical simulation

Received: 31 October 2012 Published: 25 June 2013

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	LI Yao-Gang
	WANG Wen-E
	HU Xiao-Tao

Cite this article:

LI Yao-Gang,WANG Wen-E,HU Xiao-Tao. Numerical simulation of soil water infiltration under bubbled root irrigation based on HYDRUS-3D[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(6): 546-552.

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.2013.06.017 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2013/V31/I6/546

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