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首页> 外文期刊>Soil Science Society of America Journal >Using Particle-Size Distribution Models to Estimate Soil Hydraulic Properties
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Using Particle-Size Distribution Models to Estimate Soil Hydraulic Properties

机译:使用粒度分布模型估算土壤水力特性

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摘要

Mathematical models for soil water retention characteristic [h()] and unsaturated conductivity function [K()] from particle-size distribution (PSD) and bulk density data are indirect and empirical approaches to estimate these hydraulic functions. Often times, mathematical models are fit to sparse PSD data sets to provide the input for h() and K() functions. The objective of this study was to determine whether the choice of a particular mathematical model to represent the continuous PSD significantly affects the predicted soil hydraulic properties. We considered four PSD models with between one and four fitting parameters. For most of the soils, the one-parameter Jaky model for generating PSD input, resulted in the best estimate of soil hydraulic properties. This finding indicates that the linear relationship between the PSD and the void-size distribution (VSD) (or between particle volume and pore volume) defined by the AP model would be not appropriate for most soils. This result suggests that the nonlinear relationship between the PSD and the VSD of the Jaky model would more appropriate. The PSD generated by other models provided better input to the h() and K() functions for clay soils.
机译:由粒度 分布(PSD)和堆积密度数据得出的土壤保水特性 [h()]和非饱和电导率函数[K()]的数学模型是间接的和经验 方法来估计这些液压功能。通常, 数学模型适合稀疏PSD数据集,从而为h()和K()函数提供 输入。这项研究的目的是确定选择代表连续PSD的特定数学模型是否会显着影响预测的土壤水力特性。 我们考虑了四个 PSD模型,它们具有一到四个拟合参数。对于 的大多数土壤,用于生成 PSD输入的单参数Jaky模型导致对土壤水力学特性的最佳估计。 表示由AP模型定义的 PSD与空隙尺寸分布(VSD)之间(或粒子 体积与孔体积之间)的线性关系不是 适用于大多数土壤。该结果表明,PSD与Jaky模型的VSD之间的非线性 关系将更合适。其他模型生成的PSD为粘土的h()和K()函数提供了更好的输入

著录项

  • 来源
    《Soil Science Society of America Journal》 |2003年第4期|1103-1112|共10页
  • 作者

    Sang Il Hwang; Susan E. Powers;

  • 作者单位

    Dep. of Civil and Environmental Engineering, Clarkson Univ., 8 Clarkson Ave., Potsdam, NY 13699-5710;

    Dep. of Civil and Environmental Engineering, Clarkson Univ., 8 Clarkson Ave., Potsdam, NY 13699-5710;

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