论文部分内容阅读
入渗时间和湿润锋深度关系可依据达西定律和入渗雨水质量守恒即入渗率等于入渗量对时间的导数求解,但Green-Ampt入渗模型以湿润区完全饱和考虑入渗量,同时入渗率也忽略了气阻作用,继而限制了入渗时间和湿润锋深度关系的计算精度。针对这一问题,通过分层假定和增加气阻项的入渗模型分别对入渗量和入渗率进行修正,并应用修正结果计算入渗时间和湿润锋深度的表达式。研究表明:同一入渗深度,考虑气阻项的分层假设模型的入渗时间计算值与实测值吻合度最高,偏离度很低,仅仅围绕实测值有很微小的上下波动,此研究结果对确定如含砂层稳定入渗时间具有重要作用。
The relationship between infiltration time and wetting front depth can be solved according to Darcy’s law and the conservation of infiltration storm water quality, namely, the infiltration rate is equal to the derivative of infiltration rate with time. However, the infiltration model of Green-Ampt is fully saturated considering wetting zone, At the same time, the infiltration rate also neglected the effect of gas resistance, which in turn limits the calculation accuracy of the relationship between infiltration time and depth of wetting front. In response to this problem, infiltration rates and infiltration rates were modified respectively by stratified assumptions and increased infiltration resistance models. The expressions of infiltration time and depth of wetting front were calculated by applying the corrections. The results show that: the same infiltration depth, considering the resistance of the stratified model of the infiltration time calculated by the calculated value and the measured value of the highest degree of deviation is very low, only around the measured value has a slight fluctuation, the results of this study It is important to determine the stable infiltration time as sandy layer.