含水量

定义

${\displaystyle \theta ={\frac {V_{w}}{V_{\text{wet}}}}}$

${\displaystyle u={\frac {m_{w}}{m}}}$

${\displaystyle u'={\frac {m_{w}}{m_{\text{wet}}}}}$

${\displaystyle u''={\frac {m_{w}}{m_{\text{dry}}}}}$

${\displaystyle \theta =u\times SG}$.

导出量

${\displaystyle S_{w}={\frac {V_{w}}{V_{v}}}={\frac {V_{w}}{V\phi }}={\frac {\theta }{\phi }}}$

${\displaystyle \Theta ={\frac {\theta -\theta _{r}}{\theta _{s}-\theta _{r}}}}$

测量

直接测量

${\displaystyle V_{w}={\frac {m_{w}}{\rho _{w}}}={\frac {m_{\text{wet}}-m_{\text{dry}}}{\rho _{w}}}}$

${\displaystyle m_{\text{wet}}}$${\displaystyle m_{\text{dry}}}$是样品烘干前后的质量；
${\displaystyle \rho _{w}}$是水的密度；

${\displaystyle u'={\frac {m_{\text{wet}}-m_{\text{dry}}}{m_{\text{wet}}}}}$

${\displaystyle u''={\frac {m_{\text{wet}}-m_{\text{dry}}}{m_{\text{dry}}}}}$

实验方法

${\displaystyle p={\frac {W-D}{D}}}$

(J/kg 或 kPa)

(vol/vol)

θa等于：

θa ≡ θfc − θpwp

参考文献

1. ^ T. William Lambe & Robert V. Whitman. Chapter 3: Description of an Assemblage of Particles. Soil Mechanics First. John Wiley & Sons, Inc. 1969: 553. ISBN 0-471-51192-7.
2. ^ van Genuchten, M.Th. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils (PDF). Soil Science Society of America Journal. 1980, 44 (5): 892–898 [2016-11-05]. doi:10.2136/sssaj1980.03615995004400050002x. （原始内容 (PDF)存档于2013-06-18）.
3. ^ Dingman, S.L. Chapter 6, Water in soils: infiltration and redistribution. Physical Hydrology Second. Upper Saddle River, New Jersey: Prentice-Hall, Inc. 2002: 646. ISBN 0-13-099695-5.
4. ^ F. Ozcep; M. Asci; O. Tezel; T. Yas; N. Alpaslan; D. Gundogdu. Relationships Between Electrical Properties (in Situ) and Water Content (in the Laboratory) of Some Soils in Turkey (PDF). Geophysical Research Abstracts. 2005, 7 [2016-11-05]. （原始内容存档 (PDF)于2016-03-03）.
5. ^ 存档副本. [2016-11-05]. （原始内容存档于2017-12-02）.
6. ^ 存档副本. [2007-08-22]. （原始内容存档于2007-09-29）.
7. ^ Lawrence, J. E. & G. M. Hornberger. Soil moisture variability across climate zones. Geophys. Res. Lett. 2007, 34 (L20402): L20402. Bibcode:2007GeoRL..3420402L. doi:10.1029/2007GL031382.