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Philip模型参数推求湿润锋平均基质吸力Sf准确性
引用本文:王红闪,黄明斌,董翠云.用Philip模型参数推求湿润锋平均基质吸力Sf准确性[J].水土保持通报,2004,24(2):41-45.
作者姓名:王红闪  黄明斌  董翠云
作者单位:中国科学院水利部,水土保持研究所,陕西,杨凌,712100
基金项目:中国科学院知识创新工程重要方向资助项目(KZCX3-SW-442); 中国科学院水土保持研究所领域前沿专项经费项目"坡面土壤侵蚀预报物理模型"资助
摘    要:修改的适用自然降水入渗的Green—Ampt模型是模拟坡面降水入渗、产汇流的常用手段,该模型中一个重要参数——湿润锋平均基质吸力Sf的准确取值对提高计算精度有重要作用。在分析Philip入渗模型和Green—Ampt入渗模型的基础上,建立了两模型参数间的转化关系,并尝试用Philip模型参数间接推求Green—Ampt模型中的参数Sf。通过对积水入渗资料的处理和用降水产流资料进行准确性检验,结果发现,对黄土高原黑垆土而言,用Philip模型参数间接推求Green—Ampt模型中的湿润锋平均基质吸力Sf是可行的,与直接用Green—Ampt模型获得的Sf值具有相同的精度。

关 键 词:Philip入渗模型  Green-Ampt入渗模型  湿润锋平均基质吸力  黑垆土
文章编号:1000-288X(2004)02-0041-05
收稿时间:2003/7/21 0:00:00
修稿时间:2003年7月21日

Validity of Average Potential Suction Sf of Wetting Front Calculated by Parameters in Philip Infiltration Equation
WANG Hong-shan,HUANG Ming-bin and DONG Cui-yun.Validity of Average Potential Suction Sf of Wetting Front Calculated by Parameters in Philip Infiltration Equation[J].Bulletin of Soil and Water Conservation,2004,24(2):41-45.
Authors:WANG Hong-shan  HUANG Ming-bin and DONG Cui-yun
Institution:Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi Province, China;Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi Province, China;Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi Province, China
Abstract:The modified Green-Ampt infiltration equation which is suitable to describe infiltration during an unsteady rain is widely used to simulate infiltration and runoff on the slope land.The average potential across the wetting front Sf is one of the most important parameters in it, whose validity is dependent on S f .The theoretical relationships among the parameters of the Philip equation and Green-Ampt equation are analyzed,and parameter S f in Green-Ampt equation can be calculated by the parameters values of the Philip equation. The infiltration experiments with surface ponding and unsteady rain were carried at the Changwu A gri-ecological Station in 1996, and the different values of Sfcalculated by Green-Ampt equation and parameters of the Philip equation were obtained based on the infiltration data w ith surface ponding. The validity of different Sf's values was compared by the runoff data of unsteady rain on a plane via the modified Green-Ampt equation by Chu (1978).The results showed that S f calculated by the parameters of Philip equation was valid for simulating the infiltration and runoff on a plane on the Heilu soil of theLoess Plateau.
Keywords:Philip infiltration equation  Green-Ampt infiltration equation  average potential across the wetting front  Heilu soil
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