砂沟滴灌技术参数模型

Model for estimating technical parameters of sand furrow irrigation

在分析砂沟滴灌土壤入渗规律的基础上,根据水量平衡原理建立了求解砂沟滴灌技术参数(沟宽、沟高、透水边壁高度、滴头流量)的模型,并将恒定水头积水入渗试验和Philip模型用于求解模型中的土壤入渗性能。以该模型计算的技术参数为基础,通过砂沟滴灌试验验证了模型的可行性,并对影响模型精度的因素做出了分析。试验结果表明,该模型能够较精确地设计砂沟滴灌技术参数。二维恒定水头积水入渗试验中,土壤吸渗率和渗透率是灌水时间的函数,砂沟滴灌中变化的积水深度和湿周是影响模型精度的另一个因素。

Based on the analysis of the soil infiltration rule of the Sand Furrow Irrigation （SFI）, a model for estimating the technical parameters for SFI is established according to the water-balance principle. These technical parameters are the ditch width and height, the permeable boundary height, and the emitter discharge rate. The experiments about the constant-head well infiltration and the Philip model are used to estimate the soil infiltration capacity. Based on the technical parameters cal- culated by this model, the experiments about the SFI are carried out to verify the model＇s feasibility. The factors affecting the model＇s accuracy are also analyzed. The results indicate that the model has the high precision to design the technical t）armne- ters for the SFI. The soil water sorption and soil water transmissivity are the function of the time in the two-dimensional con- stant-head well infiltration. The changing water depth and wetted perimeter are other factors affecting the model＇s accuracy.