空气阻力影响下的分层土壤非稳定降雨入渗产流模型
发布时间：2018-10-21 12:02
【摘要】：降雨或灌溉期内,土壤内的空气很难及时全部排出。禁锢在土壤中的空气产生的压力阻碍了土壤水分入渗。针对空气阻力对土壤入渗过程的影响,对Green-Ampt模型进行了改进,提出了非稳定降雨条件下考虑空气阻力作用的分层土壤降雨入渗产流模型(MGAM)。模型中,引入了饱和度系数(Sa)量化入渗水分剖面滞留空气影响下的实际导水系数和实际含水量,引入进水值(hwb)和进气值(hab)量化湿润锋处实际负压水头,并提出由土壤物理性质估算饱和度系数(Sa)、进水值(hwb)和进气值(hab)的参数化方案。为了验证模型适用性,采用MGAM模型模拟分析了室内开展的空气限制条件下的分层土壤非稳定降雨一维入渗产流试验观测成果,包括土壤水分分布特征、土壤累计入渗量和径流强度,并将模型模拟值与试验观测值,以及传统不考虑空气阻力TGAM模型(Traditional Green-Ampt Model)模拟值进行了对比分析,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、土壤含水量均大于实测值,而径流强度小于实测值。
[Abstract]:During the rainfall or irrigation period, the air in the soil is difficult to be completely discharged in time. The pressure of the air trapped in the soil hinders the infiltration of soil water. In view of the influence of air resistance on soil infiltration process, the Green-Ampt model was improved, and a stratified soil rainfall runoff model (MGAM). Was put forward considering the effect of air resistance under the condition of unstable rainfall. In the model, saturation coefficient (Sa) is introduced to quantify the actual water conductivity and actual water content under the influence of residual air in the infiltration water profile, and the influent value (hwb) and the intake value (hab) are introduced to quantify the actual negative pressure head at the wetting front. A parameterized scheme for estimating saturation coefficient (Sa), influent value (hwb) and intake air value (hab) from soil physical properties was proposed. In order to verify the applicability of the model, MGAM model was used to simulate and analyze the results of one-dimensional infiltration and runoff experiment of stratified soil under the condition of air limitation, including the characteristics of soil moisture distribution. The soil accumulative infiltration and runoff intensity were compared with the simulated values of the model and the experimental values, and the simulated values of the traditional TGAM model (Traditional Green-Ampt Model) without considering the air resistance. The results showed that the cumulative infiltration of the soil was simulated by the MGAM model. The soil water content and runoff intensity are in good agreement with the measured results, while the TGAM model simulates the cumulative infiltration of the soil, the soil moisture content is larger than the measured value, and the runoff intensity is less than the measured value.
【作者单位】： 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;
【基金】：国家重点基础研究发展规划项目(2015CB452701) 国家自然科学基金项目(51379215,50939006) 流域水循环模拟与调控国家重点实验室自主研究课题(2016ZY03)
【分类号】：S152.72
本文编号：2285036
[Abstract]:During the rainfall or irrigation period, the air in the soil is difficult to be completely discharged in time. The pressure of the air trapped in the soil hinders the infiltration of soil water. In view of the influence of air resistance on soil infiltration process, the Green-Ampt model was improved, and a stratified soil rainfall runoff model (MGAM). Was put forward considering the effect of air resistance under the condition of unstable rainfall. In the model, saturation coefficient (Sa) is introduced to quantify the actual water conductivity and actual water content under the influence of residual air in the infiltration water profile, and the influent value (hwb) and the intake value (hab) are introduced to quantify the actual negative pressure head at the wetting front. A parameterized scheme for estimating saturation coefficient (Sa), influent value (hwb) and intake air value (hab) from soil physical properties was proposed. In order to verify the applicability of the model, MGAM model was used to simulate and analyze the results of one-dimensional infiltration and runoff experiment of stratified soil under the condition of air limitation, including the characteristics of soil moisture distribution. The soil accumulative infiltration and runoff intensity were compared with the simulated values of the model and the experimental values, and the simulated values of the traditional TGAM model (Traditional Green-Ampt Model) without considering the air resistance. The results showed that the cumulative infiltration of the soil was simulated by the MGAM model. The soil water content and runoff intensity are in good agreement with the measured results, while the TGAM model simulates the cumulative infiltration of the soil, the soil moisture content is larger than the measured value, and the runoff intensity is less than the measured value.
【作者单位】： 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;
【基金】：国家重点基础研究发展规划项目(2015CB452701) 国家自然科学基金项目(51379215,50939006) 流域水循环模拟与调控国家重点实验室自主研究课题(2016ZY03)
【分类号】：S152.72
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