降水头垂直入渗Green-Ampt模型显式近似解研究  

Approximate Explicit Solution to Precipitation Head Vertical Infiltration of Green-Ampt Model

作　　者：范文涛[1] 牛文全[1,2] 张振华[3] 甲宗霞[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]中国科学院/水利部水土保持研究所,陕西杨凌712100 [3]鲁东大学地理与规划学院,山东烟台264025

出　　处：《灌溉排水学报》2012年第1期50-53,共4页Journal of Irrigation and Drainage

基　　金："十二五"863计划课题(2011AA100507);农业科技成果转化资金项目(2010GB2G000470)

摘　　要：在分析降水头入渗过程的基础上,应用Green-Ampt入渗模型,并假定降水头垂直一维入渗也适用于Philip入渗模型的前提下,通过二模型参数间的转换关系建立了适用于降水头垂直一维入渗的累积入渗量的显式函数,并利用3种不同土壤进行了检验。结果表明,降水头垂直一维入渗的累积入渗量可适用于Philip入渗模型,所建立的降水头垂直一维累积入渗量显函数的整体相对误差分别为1.89%、0.02%、0.10%;均方根误差分别为0.13、0.07、0.08,模型的模拟精度较高,能有效地模拟连续降水头条件下的入渗过程。Based on the analysis of precipitation head infiltration,it was on the premise of postulate for precipitation vertical one-dimensional infiltration also being suitable to the Philip infiltration model and applied Green-Ampt infiltration model to study the approximate explicit solution.The proper explicit function to cumulative precipitation vertical one-dimensional infiltration was established with the conversion relationship of the two models and was tested under 3 different soils.The applicability of Philip infiltration model under precipitation head vertical one-dimensional infiltration was verified.The explicit function to cumulative precipitation vertical one-dimensional infiltration was established based on the Green-Ampt infiltration model,whose IRE respectively was 1.89%,0.02%,0.10% and RMSE respectively was 0.13,0.07,0.08.The calculated value of cumulative infiltration tallied with the actual value well.It was suggest that this function had the good precision and could simulate the process of continual precipitation head infiltration effectively.

关 键 词：降水头 GREEN-AMPT模型 累积入渗量 显式函数 

分 类 号：S152.7[农业科学—土壤学]