| 马 英,冯绍元,刘晓东,苏冬源.考虑禁锢空气影响的层状土壤Green-Ampt入渗模型及试验验证[J].水利学报,2011,42(9): |
| 考虑禁锢空气影响的层状土壤Green-Ampt入渗模型及试验验证 |
| A modified Green-Ampt model for water infiltration in layered soils with air entrapment and its experimental validation |
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| DOI： |
| 中文关键词: 入渗 改进Green-Ampt模型 层状土壤 禁锢空气 试验验证 |
| 英文关键词: water infiltration modified Green-Ampt model layered soils air entrapment experimental
validation |
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| 中文摘要: |
| 为考虑土壤孔隙中禁锢空气对入渗水流的阻滞作用，引入饱和度系数Sa （Sa小于1） 来量化湿润区的饱和程度，建立了改进的层状土壤Green-Ampt入渗模型 （MGAM），并提出了由土壤物理特性参数估算Sa的计算公式。为检验MGAM的适用性，分别在室内长土柱和田间进行层状土壤的积水入渗试验，并采用 MGAM、传统的Green-Ampt模型（TGAM） 和由Bouwer法修正的Green-Ampt模型 （BGAM） 对入渗过程进行模拟。结果表明：估算得到的 Sa反映了湿润区的真实饱和程度与持水能力；TGAM模 |
| 英文摘要: |
| A modified Green-Ampt model （MGAM） was proposed in this study to simulate water infiltration in layered soils with entrapped air. A saturation coefficient Sa （less than 1） was introduced in MGAM
to account for the effect of air entrapment on infiltration. The Sa could be approximately determined from soil physical properties. Infiltration experiments in a laboratory layered soil column and field layered soil profile were conducted to test the applicability of MGAM. For comparison，the infilt-ration process was also simulated by the traditional Green-Ampt model （TGAM） and the Bouwer Green-Ampt model （BGAM） . The estimated Sa values by these model were very close to the measured saturation degree of soil layers at the termination of experiment. The simulation results indicate that the TGAM significantly overestimated the infiltration rate and cumulative infiltration，whereas the BGAM considerably underestimated the infiltration rate and cumulative infiltration. Furthermore，the depths of wetting front simulated by TGAM and BGAM were considerably smaller than the measured values. The comparison result shows that，the MGAM provided satisfactory simulation results，and it adequately described the infiltration process in both the laboratory soil column and field soil profile. |
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