Jump to content

Talk:Water retention curve

Page contents not supported in other languages.
From Wikipedia, the free encyclopedia

Hysteresis

[edit]

.There is no unique relationship between Ψ and θ because moisture relations exhibit hysteresis. Diurnal hysteresis presents a huge challenge in measuring soil moisture content with intruments that measure potenntial.

Hysteresis arises from differences in (soil) wetting behaviour causing dry soil to re-wet. Hysteretic behaviour means that, for example, at a tension of 5kPa (0.05 bar) the water content of a field fine sand sample could be anything between 0.08 vwc to 0.25 vwc.(This is a worst scenario but has been recorded).[1]

See [2], [3], [4]

Paleorthid 21:25, 5 April 2006 (UTC)[reply]

Graph incorrect

[edit]

The graph shown is incorrect. Matric potential should be negative kPa, not positive. Atrian 16:36, 27 December 2006 (UTC)[reply]

The graph is indeed correct. Often times the absolute value of potential is shown to eliminate the need for a negative y-axis.Mjt9400 (talk) 16:20, 19 November 2009 (UTC)[reply]

kPa is much more commonly used than hPa and would be preferable for the graph Haresfur (talk) 22:30, 14 April 2020 (UTC)[reply]

Curve Models

[edit]

I changed the heading to reflect that this section talks about modelling the curves not just the parameters. Hopefully, others will be added as they are alluded to in the text.Haresfur (talk) 22:57, 14 April 2020 (UTC)[reply]

The description of the van Genutchen model is incomplete because the meaning of the different parameters (and how they are determined) is absent. The van Genutchen model might warrant its own page but I'm not knowledgable enough to add the content here or on its own page.Haresfur (talk) 22:57, 14 April 2020 (UTC)[reply]

Graph captiontext is incorrect

[edit]

The graph contains the german soil type discriptions, Ss is sandy sand or (pure sand), Uu silty silt (or normal silt), Ll is loamy loam and Tt clay clay. there is no graph for peat See Ad-Hoc-Ag Boden, Bodenkundliche Kartieranleitung, Edition 5, ISBN 3-510-95920-5 Feb. 19. 2010 Christian K

Reference

[edit]

Plan to see this developed into an inline cite in support of the importance of the Buckingham 1907 related article content:

Buckingham, 1907: An Appreciation

T. N. Narasimhan Vadose Zone Journal 4:434-441 (2005). doi:10.2136/vzj2004.0126 Convenience link: http://www.olemiss.edu/sciencenet/saltnet/buckingham_1907_vaj_may_05.pdf.

"Nearly a century ago, Edgar Buckingham published a seminal work on the movement of soil moisture that is part of the foundation of modern soil physics. It also constitutes a pioneering contribution in the study of multiphase flow in porous media." -- Paleorthid (talk) 18:12, 18 January 2016 (UTC)[reply]

[edit]

Hello fellow Wikipedians,

I have just modified one external link on Water retention curve. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 21:44, 24 January 2018 (UTC)[reply]