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| Effects of water temperature on soil water infiltration characteristics under drip irrigation |
| LIU Lihua, FEI Liangjun, ZHU Hongyan |
| Institute of Water Resources and Hydro-electric Engineering, Xi′an University of Technology, Xi′an,Shaanxi 710048, China |
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Abstract In order to determine the effect of different water temperature on soil water infiltration characteristics of drip irrigation, the research about Xi′an Silty loam water infiltration has been carried out by drip irrigation simulation experiment at the water temperature of 4, 20, 30, 40 ℃. The results show that: The migration distance of the wetting front increases with the infiltration time. at the same infiltration time, with the water temperature rising, the migration distance of the wetting front and dripper discharge will increase. The model of horizontal (vertical) migration distance of the wetting front, the infiltration time and water temperature was established under the condition of drip irrigation water infiltration at different water temperatures, its correlation coefficient is greater than 097. The average moisture content of the wetted body is closely related to the infiltration water temperature and time. The higher the infiltration water temperature, the smaller the average water content of the soil. The isolpeth map of soil moisture content in the wetted body are closer to the drip distance from near to far and from the sparse to the dense distribution. With the infiltration of water temperature continues to rise, infiltration into the same depth of time required to gradually reduce and the greater the impact on soil temperature. The change of soil layer temperature in the depth range of 15 cm below soil surface is more prominent within 400 minutes of infiltration time. The conclusion could provide the reference for further studies of drip irrigation technology.
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Received: 09 March 2017
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