| 毛晓敏,姚立强,冯绍元,王莹莹.层状土条件下混凝土衬砌渠道渗漏及土壤水分分布的数值模拟[J].水利学报,2011,42(8): |
| 层状土条件下混凝土衬砌渠道渗漏及土壤水分分布的数值模拟 |
| Numerical simulation on canal seepage and soil water distribution for concrete lining canal with layered soil structure |
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| DOI： |
| 中文关键词: 渠道衬砌 渠道渗漏 分层土壤 饱和-非饱和土壤水流 数值模拟 HYDRUS-2D |
| 英文关键词: canal lining canal seepage layered soil saturated-unsaturated soil water flow numerical simulation HUDRUS-2D |
| 基金项目: |
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| 中文摘要: |
| 基于我国西北干旱区石羊河流域复杂层状土条件下进行的混凝土衬砌渠道渗漏试验，建立了考虑混凝土衬砌层和层状渠床的饱和-非饱和有压土壤水入渗模型。采用HYDRUS-2D对渠道渗漏和土壤水分分布进行了数值模拟研究。模型模拟结果和实测渗漏量、实测渠道周边土壤含水率等吻合较好，表明该模型对于模拟复杂层状渠床情况下的渠道渗漏比较可靠。在此基础上，进一步模拟分析了渠道衬砌和土壤层状结构特性对渠道渗漏产生的影响，以及层状土和均质土在湿润峰行进方面的区别。结果表明渠道渗漏强度受渠道衬砌形式的影响最大，其次为渠床附近的弱渗透性 |
| 英文摘要: |
| Based on the canal seepage ponding test in the Shiyang River basin in northwest China，a satu?rated-unsaturated flow model with pressure infiltration was established for canal seepage with concrete lining and distinct layered canal bed. The HYDRUS-2D was applied for the simulation of canal seepage and the induced soil water content variation. The simulation results agree well with the data of monitored canal seepage and the soil water content variation，which indicates that the model is reliable for the canal seepage simulation under the complex soil structure. In addition，further simulations were carried out to examine the effect of canal lining and soil characteristics in soil layers on canal seepage，and to compare the difference of wetting advancement for layered soil and homogeneous soil. The results show that canal seepage is greatly influenced by the canal lining，followed by the soil layer near the bank with weak permeability. However，the soil layer with strong permeability tends to inhibit canal seepage to some extent. Under similar canal seepage rate，the soil water dynamics with layered soil can be significantly different from that of homogeneous soil. |
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