[1]石玉洁,杨新民,史竹叶.黄土高原几种质地土壤的水分扩散率[J].水土保持研究,1985,(02):29-37.
Shi Yujie,Yang Xinmin,Shi Zhuye.THE WATER DIFFUSIVITY OF DIFFERENT TEXTURE SOILS IN THE LOESS PLATEAU[J].Research of Soil and Water Conservation,1985,(02):29-37.
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Shi Yujie,Yang Xinmin,Shi Zhuye.THE WATER DIFFUSIVITY OF DIFFERENT TEXTURE SOILS IN THE LOESS PLATEAU[J].Research of Soil and Water Conservation,1985,(02):29-37.
黄土高原几种质地土壤的水分扩散率
《水土保持研究》[ISSN:1005-3409/CN:61-1272/P]
卷:
期数:
1985年02期
页码:
29-37
栏目:
出版日期:
1900-01-01
- Title:
- THE WATER DIFFUSIVITY OF DIFFERENT TEXTURE SOILS IN THE LOESS PLATEAU
- 摘要:
- 本文采用水平土柱入渗法，测定了四种不同质地、不同孔隙度土壤的水分扩散率。结果表明，粘粒含量较多和孔隙度较小的土壤，单位时间内入渗水量较少，渗到既定距离需要的时间较长。各种质地土壤的扩散率D都随含水量增加而增加。当饱和度相同时，质地愈粘重，扩散率愈小。扩散率和孔隙度呈正相关。本文建立了土壤扩散率D和饱和度c的幂函数方程。将其运用到非饱和水分运动方程中，以有限差分数值计算法，所得土壤含水量的计算值和实测值比较接近，说明这些经验公式有一定的可靠性。
- Abstract:
- The water diffusivity was determined for four soils with different texture and porosity using an infiltration method of horizontal columns. Experiments show that infiltrating water into a given distence needs longer time for the soils having higher content of clay and less porosity.The diffusivity D increase with increasing of soil water content θ for different texture soils. At the identical saturation. G, the clayer the soil texture, the less the diffusivity is. The positive relation exists between soil diffusivity and porosity in the same texture soils. The experiential formulas of power function form between diffusivity D and saturation G is proposed in present peper. Calculated values obtained by these formulas through numerical calculation method of limited difference in unsaturated water movement equation approach measured values. It is explained that these experiential formulas are reliable.
参考文献/References:
[1] 清华大学水利系.水资源及农田水利教研组, 土壤水动力学, 1982, 2.32-33页.
[2] R.R.Bruce and Klute. The maasurement of soil moisture diffisivity, Soil Sci Soc.of Amer.Proc, Vo1.20, No.4, 1056, p453-462.
[3] RAY D Jackson.Porosity and soil-water diffusivity relitions, Soil Sci. Soc. of Amer.Proc. Vol, 27, No.2, 1963, p123-126.
[4] 清华大学水利系农水教讲组, 一维非饱和土壤水有限差分数值计算研究, 1981.
[5] 孙讷正, 地下水流的数学模型和数值方法, 地质出版社, 1981, 103-104页.
更新日期/Last Update:
1900-01-01