| 甘永德,贾仰文,王康,王浩,魏娜.考虑空气阻力作用的分层土壤降雨入渗模型[J].水利学报,2015,46(2): |
| 考虑空气阻力作用的分层土壤降雨入渗模型 |
| Rainfall infiltration model considering gas resistance effect in layered soil |
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| DOI： |
| 中文关键词: 分层土壤 Green-Ampt模型 入渗产流 空气阻力 |
| 英文关键词: multi-layered soil Green-Ampt model infiltration-runoff air resistance |
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| 中文摘要: |
| 基于室内试验资料，建立了非稳定降雨条件下考虑空气阻力作用的Green-Ampt模型（Modified Green-AmptModel， MGAM），其包括非稳定降雨条件下土壤积水入渗过程和非积水入渗过程、湿润锋运移过程、积水入渗状态和非积水入渗状态相互转化过程。为了量化空气阻力作用影响程度，引入了饱和度系数Sa，并提出饱和度系数计算方法。同时应用MGAM 和传统的Green-Ampt 模型（Tranditional Green-Ampt Model，TGAM）模拟了径流强度、土壤累计入渗量和土壤剖面含水量，并和实测值进行了对比分析。结果表明：MGAM 模型模拟的土壤累计入渗量、土壤含水量和径流强度均与实测结果吻合良好，而TGAM 模型模拟土壤累计入渗量、剖面含水量均大于实测值，而径流强度小于实测值。 |
| 英文摘要: |
| Based on the result of scientific experiments， an algorithm considered air resistance effect was proposed for simulating infiltration into layered soil profile under unsteady rainfall. The model includes ponding and no ponding infiltration under unsteady rainfall， tracks the movement of wetting front， checks the ponding status， and handles the shift between ponding and no ponding conditions. A saturation coefficient （Sa） was introduced to account for the effect of air resistance. The Sa could be approximately determined by soil physical properties. At the same time， the model （MGAM） and the traditional Green-Ampt model （TGAM） were applied to simulate runoff rate， soil water content and cumulative infiltration， and compared with the observed data in the experiments. The results indicate that calculated runoff rate， soil water content and soil cumulative infiltration by MGAM are all in good agreement with that of the observed，but the soil water content and soil cumulative infiltration calculated by TGAM are larger than the observed， and the calculated runoff rate is less than the observed. |
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