| Cite this article: | 张 健,魏占民,张金丁,等.渠道土壤含水率的时空变化及渗漏模拟研究[J].灌溉排水学报,0,():-. |
| ZHANG Jian,WEI Zhanmin,ZHANG Jinding,et al.渠道土壤含水率的时空变化及渗漏模拟研究[J].灌溉排水学报,0,():-. |
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| Spatio-temporal Variations of Soil Moisture Content in Channel and Seepage Simulation Study |
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ZHANG Jian1, WEI Zhanmin1, ZHANG Jinding1, YANG Xudong1, SU Rina2
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1.College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University;2.Center of Water Conservancy News Propaganda of Inner Mongolia Municipality
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| Abstract: |
| Proven channel spatial and temporal variations of soil moisture content and different water depths under the condition of channel seepage law, adopt the method of constant hydrostatic test water channel leakage test, a test set up 8 infiltration water head, space-time change law of soil moisture content, analysis of channel to explore the channels to the cumulative infiltration amount under the conditions of different water depth and the change rule of infiltration rate. Based on the experimental study of channel seepage in layered soil in the field, a two-dimensional saturated-unsaturated soil water infiltration model with pressurized head was established. Hydrus-2d software was used to simulate the channel and the channels of homogeneous silty soil and silty loam. The experimental results show that :(1) when the stratified interface exists in the soil profile, the critical interface has a moderating effect on water infiltration, and the time for the lower part of the stratified interface to reach the saturated moisture content increases correspondingly, and after reaching a certain time, the moderating phenomenon disappears, and water infiltration changes linearly and uniformly after passing through the stratified interface. (2) the water moves in the soil, and the change of potential energy is the main driving force. The change of channel water depth causes the change of pressure potential, and the water depth is positively correlated with the gradient of water potential in the soil of the channel bed, so it is positively correlated with the leakage flux. (3) the more viscous and heavy the channel soil, the smaller the pores between the soil particles, the greater the resistance to water leakage, the smaller the hydraulic conductivity, the greater the soil water holding capacity, and the smaller the leakage loss of the channel. The results of this study can provide methods and means for the implementation of water-saving engineering transformation in irrigated areas, the control index of effective utilization coefficient of irrigation water and regional water resources evaluation. |
| Key words: Hydrus-2D; Layered Soil; Channel Leakage; Soil Moisture Content; The Numerical Simulation |
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