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| DOI：10.13522/j.cnki.ggps.20180271 |
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| The Influence of Water Depth on Water Leaching from Channel in Hetao Irrigation District |
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ZHANG Jinding,WEI Zhanmin,XU Dawei,YANG Xudong,WANG Fu
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Water Conservancy and Civil Engineering College,Inner Mongolia Agriculture University, Hohhot 010018, China
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| Abstract: |
| 【Objective】Water leaching from channels in irrigation district is affected by many factors and in this paper, we investigate experimentally the role of water depth inside the channel in impacting water leaching.【Method】The experiment was conducted in channels in Hetao Irrigation District, and in the experiment we measured infiltration rate and accumulating infiltration using static water surface method.【Result】①When water depth inside the channel was the same, the cumulative infiltration into soil from the channel bed increased with the infiltration time and both soil infiltration rate and the channel seepage rate decreased as time elapsed, reaching steady state ultimately. ②The accumulated infiltration, soil infiltration rate and channel leaching intensity varied differently with water depth inside the channel. ③Changes in soil moisture in the channel bed was influenced by potential gradient in soil, soil water conductivity and the wetting perimeter.【Conclusion】Water depth inside the channel has a great influence on cumulative infiltration, infiltration rate, water leaching and soil moisture dynamics in the channel bed, with the former three exponentially increasing with the water depth. An optimal water depth of 70 cm can be used under the similar infiltration condition. |
| Key words: channel depth; infiltration characteristics; infiltration rate; cumulative infiltration; the intensity of leakage |
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