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| DOI：10.13522/j.cnki.ggps.2019171 |
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| Study on Experiment and Simulation of Cumulative Infiltration under the Wide Ridge Furrow Using HYDRUS |
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WANG Shunsheng, LIU Shuaiye, FU Yuliang, WANG Aibin, CHEN Chunlai, YAN Yongfang
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1.Department of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; 2.Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China
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| Abstract: |
| 【Background】Wide ridge irrigation technology belongs to the category of ditch irrigation, and its water infiltration process is two-dimensional infiltration. Soil volume mass, texture, irrigation ditch type, furrow specification, soil initial moisture content and pressure head during irrigation would affect the infiltration of water. At present, many scholars have carried out research on the characteristics of furrow irrigation and infiltration through a large number of indoor and outdoor experiments, but the research on wide ridge irrigation is less, and there is no more systematic model of wide ridge irrigation and infiltration.【Objective】In order to explore the influence of pressure head and initial soil moisture content on cumulative infiltration. 【Method】The effects of both on the accumulated infiltration of soil were analyzed based on the Hydrus-2D simulation of the wide ridge irrigation process of homogeneous soil under 5 different initial moisture content and pressure water head conditions. On the basis of the capacitive charging model, an empirical model of the infiltration volume and the infiltration time of the irrigation with wide ridges and furrows was established. 【Result】 With the increase of pressure head, the accumulated infiltration amount of soil under wide ridge and furrow irrigation increased, and decreased with the increase of moisture contents. The simulation value of the empirical model is close to the measured value of the verification test, and the simulation effect of the model is better. 【Conclusion】 Increasing the pressure head or decreasing the initial moisture content of the soil is beneficial to the increase of the accumulated infiltration in the irrigation of wide ridges and furrows. The established model of accumulated infiltration of wide ridge irrigation has great accuracy. |
| Key words: wide furrow irrigation; cumulative infiltration; model; Hydrus-2D; soil |
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