Validity of Average Potential Suction Sf of Wetting Front Calculated by Parameters in Philip Infiltration Equation

WANG Hong-shan; HUANG Ming-bin; DONG Cui-yun

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Validity of Average Potential Suction Sf of Wetting Front Calculated by Parameters in Philip Infiltration Equation

- Validity of Average Potential Suction Sf of Wetting Front Calculated by Parameters in Philip Infiltration Equation
- Bulletin of Soiland Water Conservation Vol. 23, Issue 2, Pages: 41-45(2004)
- 作者机构：
  
  中国科学院水利部水土保持研究所,陕西杨凌,712100
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- Published：2004
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WANG Hong-shan, HUANG Ming-bin, DONG Cui-yun. Validity of Average Potential Suction Sf of Wetting Front Calculated by Parameters in Philip Infiltration Equation[J]. Bulletin of Soiland Water Conservation, 2004, 23(2): 41-45.
DOI：

WANG Hong-shan, HUANG Ming-bin, DONG Cui-yun. Validity of Average Potential Suction Sf of Wetting Front Calculated by Parameters in Philip Infiltration Equation[J]. Bulletin of Soiland Water Conservation, 2004, 23(2): 41-45. DOI：

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S

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S

。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S

值具有相同的精度。

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.

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