[1]邵明安.四种方法推求土壤导水参数的差别及其准确性[J].水土保持研究,1985,(02):54-62.
Shao Mingan.THE DIFFERENCE AND ACCURACY FOR FOUR METHODS DETERMINING SOIL HYDRAULIC PARAMEERS[J].Research of Soil and Water Conservation,1985,(02):54-62.
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Shao Mingan.THE DIFFERENCE AND ACCURACY FOR FOUR METHODS DETERMINING SOIL HYDRAULIC PARAMEERS[J].Research of Soil and Water Conservation,1985,(02):54-62.
四种方法推求土壤导水参数的差别及其准确性
《水土保持研究》[ISSN:1005-3409/CN:61-1272/P]
卷:
期数:
1985年02期
页码:
54-62
栏目:
出版日期:
1900-01-01
- Title:
- THE DIFFERENCE AND ACCURACY FOR FOUR METHODS DETERMINING SOIL HYDRAULIC PARAMEERS
- 摘要:
- 本文研究了四种不同方法推求土壤导水参数的差别和准确性。这四种方法是：（1）根据土壤水分的再分布过程推求土壤的导水参数；（2）水平土柱法测定土壤水分扩散率D（θ），由特征曲线推求导水率K（θ）；（3）利用特征曲线，根据垂直土柱蒸发的实测水分动态过程计算土壤的导水参数；（4）瞬时剖面法测定导水率K（θ），由特征曲线推求扩散率D（θ）。研究结果表明：在相同的土壤含水量范围内，四种方法所获得的导水参数除方法（2）外，其他三种方法获得的值均比较接近；以水分运动基本方程为依据的推求方法（1）、（2）比以达西定律为基础的推求方法（3）、（4）有较高的准确度，其准确度分别为0.85，1.00，0.35和0.45；四种方法的最佳适用范围分别是：（1）0.17≤θ≤0.28；（2）0.20≤θ≤0.29；（3）0.18≤θ≤0.28；（4）0.33≤θ≤0.35。
- Abstract:
- This article is concerned with the problem of difference and accuracy for four methods determining soil hydraulic conductivity and diffusivity. The four methods are:(1)Determining soil hydraulic parameters from redistribution of soil moisture; (2) Measuring hydraulic diffusivity by horizontal infiltration method, calculating hydraulic coductivity using soil-moisture characteristic curve; (3) Computerizing hydraulic couductivity and diffusivity in accordance with soil moisture dynamic profiles of measurement of evaporation from vertical column by usiug soil-moisture characteristic curve; (4)Measuring hydraulic conductivity by transient profile method,obtaining hydraulic diffusivity by calculating based on the characteristic curve. The results indicate that the values of hydraulic couductivity and diffusivity got by different methods are approximate in the same scopes of soil-moisture content except method (2); The accuracies of the method(1) and method(2)which are based on the general flow equation of soil moisture are higher than those of based on Darcy’s Law [i.e. method(3) and method (4)].They relative accuracies are 0.85, 1.00, 0.35 and 0.45 respectively; The usable soil-moisture scopes of four methods are 0.17≤θ≤0.28, 0.20≤ θ≤0.29, 0.18≤θ≤0.28 and 0.33≤θ≤0.35 respectively.
参考文献/References:
[1] 石玉洁等, 蒸发条件下土壤导水率和扩散率的测定, 水利学报, 1984(2).
更新日期/Last Update:
1900-01-01