User talk:Paleorthid/Archive 2

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== Article Licensing ==

Hi, I've started a drive to get users to multi-license all of their contributions that they've made to either (1) all U.S. state, county, and city articles or (2) all articles, using the Creative Commons Attribution-Share Alike (CC-by-sa) v1.0 and v2.0 Licenses or into the public domain if they prefer. The CC-by-sa license is a true free documentation license that is similar to Wikipedia's license, the GFDL, but it allows other projects, such as WikiTravel, to use our articles. Since you are among the top 2000 Wikipedians by edits, I was wondering if you would be willing to multi-license all of your contributions or at minimum those on the geographic articles. Over 90% of people asked have agreed. For More Information:

Multi-Licensing FAQ - Lots of questions answered
Multi-Licensing Guide
Free the Rambot Articles Project

To allow us to track those users who muli-license their contributions, many users copy and paste the "{{DualLicenseWithCC-BySA-Dual}}" template into their user page, but there are other options at Template messages/User namespace. The following examples could also copied and pasted into your user page:

Option 1

I agree to [[Wikipedia:Multi-licensing|multi-license]] all my contributions, with the exception of my user pages, as described below:

OR

Option 2

I agree to [[Wikipedia:Multi-licensing|multi-license]] all my contributions to any [[U.S. state]], county, or city article as described below:

Or if you wanted to place your work into the public domain, you could replace "{{DualLicenseWithCC-BySA-Dual}}" with "{{MultiLicensePD}}". If you only prefer using the GFDL, I would like to know that too. Please let me know what you think at my talk page. It's important to know either way so no one keeps asking. -- Ram-Man (comment| talk)

Thanks for kudo

Very nice of you mate, especially coming from a soil scientist. Long time since I took horticulture in college, and I live in place with almost no soil now (Florida Keys). I tried to make the article at least a bit more readable. Glad you think I succeeded! Obviously could still use a lot more info, fascinating subject. DavidH July 7, 2005 20:59 (UTC)

PET notes

Penman notes

The concept of PET was first developed by H. L. Penman in the 1940's. Penman, H.L. 1948. Natural evaporation from open water, bare soil and grass. Proceedings of the Royal Society of London, A193: 120-146.

crop coefficient

A crop coefficient a coefficient calculated as the ratio of reference evapotranspiration and crop evapotranspiration for any crop. It is useful to compute the irrigation demand of any crop based on its growth stage.

Models

Benke-Massey. A combined radiation-temperature approach, PET in the Benke-Massey model is a function of solar radiation, based on latitude, and air temperature.
Blaney-Criddle (1950, 1958). A temperature method.
SCS modified Blaney-Criddle (SCS, 1967) A temperature method. Considered not very accurate. Underestimates under dry, windy or hot conditions. Overestimates under cloudy, humid or calm conditions.
Hargreaves. (1985) Basically a radiation approach, this model also uses some temperature data.
Jarvis-McNaughton (1986). Derived from modified Penman-Monteith.
Jensen-Haise. (1963)
Kharuffa
Kohler.
McCloud (1955). A temperature approach.
Penman (1948): A combined radiation-temperature approach, Penman equations require temperature, relative humidity, wind speed, saturation vapor pressure, and net radiation. It also uses complicated unit conversions and lengthy calculations. A variation of Penman-Monteith uses only air temperature data.
Penman (1963): A combined radiation-temperature approach.
FAO24 Modified Penman (Doorenbos & Pruitt1977). A combined radiation-temperature approach.
modified FAO Penman (allen, 1998). A combined radiation-temperature approach.
IFAS Penman (Jones,1984).
ASCE modified Penman (Walter,2000) A combined radiation-temperature approach
Penman-Monteith (Monteith 1973). A combined radiation-temperature approach, it also depends on plant cover type.
modified Penman-Monteith (Linacre 1977). Appears this is also known as Linacre ((1977, 1984, 1991). Linacre reportedly uses temperature data alone.
ASCE Penman-Monteith (Jensen, 1990). A combined radiation-temperature approach
Priestly-Taylor (1972). A combined radiation-temperature approach, it also depends on plant cover type. PET is based on solar radiation with daily minimum and maximum air temperature.
Hargreaves and Samani (1982,1985): Hargreaves-Samani use air temperature data.
Thornwaite (1944,1948): Using a temperature based model, Thornwaite developed a monthly regional water balance model with 3 components (Precipitation, Overland Runoff, Evaporation) and comprised of 4 parameters (Precipitation, Temperature, Latitude, Soil Water Holding Capacity). This model was used as the basis for many future development of regional water balance models.Thornwaite is known to systematically underestimate PET in more arid regions and seasons.
Thornwaite and Mather (1955). A temperature-based approach with only two parameters.
Turc (1961). A radiation-based approach.

sources

references

http://www.vcrlter.virginia.edu/gopher/Publications/Personal%20Reference%20Lists/Hayden

Thornwaite, C.W., and Mather, J.R. (1957). Instructions and Tables for Computing Potential Evapotranspiration and the Water Balance. Publications in Climatology, X(3):185-198. 0006 CL.

This is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page.