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| Experimental study and simulation on cumulative infiltration characteristics of soil water under wide ridge furrow irrigation |
| WANG Shunsheng1, CHEN Chunlai1, WANG Aibin2, FU Yuliang1* |
| 1. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450046, China; 2. Yellow River Institute of Hydraulic Research, Zhengzhou, Henan 450003, China |
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Abstract To explore the characteristics of soil moisture accumulation and infiltration changes under wide ridge furrow irrigation, on the basis of field experiment, the effects of different groove width(40 cm, 50 cm, 60 cm)and ditch depth(20 cm, 25 cm, 30 cm)on the cumulative infiltration with time were studied by using HYDRUS-2D software simulation combined with theoretical analysis and nume-rical simulation, and the method of research is mainly focused on the single wide into the ditch flow rate of 0.5 L/(s·m), water after 15 min. The results showed that: when the ditch depth was constant, the cumulative infiltration at 60 cm and 50 cm increased by 21.88% and 7.88% compared with 40 cm, the larger the groove width, the greater the cumulative infiltration, and when the groove width was constant, the cumulative infiltration at 30 cm and 25 cm decreased by 3.80% and 2.05%, compared with 20 cm, the larger the ditch depth, the smaller the cumulative infiltration. On the basis of the capacitive charging model, the calculation model of cumulative infiltration under the condition of different groove width and depth is established, and the relationship between cumulative infiltration and time is exponential function, and by using the test data calculation model is verified, and the calculation precision of model is higher, the results can provide reference for improving wide ditch infuse water technology.
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Received: 11 October 2019
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