Program PDunne

(c) R. Muñoz-Carpena & J. Alvarez Benedí

2002, University of Florida (USA) & S.I.D.T.A. – Valladolid (Spain)

Download Pdunne program, sample inputs and documentation - Windows (4.5Mb), Unix (77.5Kb), MacOSX (254Kb),

1. Description

Program to calculate the field K_s method based on the Philip-Dunne permeameter. The permeameter is based on T. Dunne apparatus and data from the Amazon River basin, as presented by Philip (1993). The apparatus consists on a vertically inserted pipe of internal radius r_i filled with water to a depth D_o at time t=0. Philip (1993) replaced the disk-shaped water supply surface of radius ri by a spherical supply surface of equal area with radius r_o=0.5 r_i and applied an approximate dimensional analysis based on the Green-Ampt model to propose flow equations. A simplified procedure for calculating field K_s based on Philip's (1993) dimensionless analysis of this case is presented by de Haro (1998) and followed here. More details on the field application of this permeameter and solution procedure can be found in Muñoz-Carpena et al. (2002).

The program runs in DOS and UNIX mode and is written in FORTRAN. Command line UNIX and DOS versions as well as a complete MS-Windows interface and a simple MacOSX one are available for download (follow links above).

2. Program usage and output

For Windows installations, locate setup in the distribution media and start it by clicking twice with the mouse on the windows icon. Follow the instructions on the MS-Windows installer to complete installation.

For DOS installations, unpack the contents of the ZIP package on a directory. The program (pdunne.exe) and sample files will be written into this directory. A unix package with a compilation script is available from the authors upon request.

The DOS and UNIX program inputs are chosen as arguments from the command line. A short description of the program use can be obtained by executing the program with no arguments:

> pddune <return>

Name: pdunne

(PDUNNE Philip-Dunne permeameter data)

Version: 0.3 DOS and UNIX, 08/28/2002

(c) 2000 - R. Munoz-Carpena

Use: pdunne input_file

input_file: name of input file (1-12 chars.)

For example, if your executable is named pdunne.exe (pdunne in UNIX), and the input file test.pd then you would type:

> pdunne test.pd <return>

This will produce a program output file in the working directory named pd.out. The file can be imported and edited in any standard text editor or word processor. When working with the MS-Windows GUI the press the button “Evaluate” after filling in the required inputs. After the calculations are done a new window appears with the results, options to rename the output file to a different name other that pd.out, and copy the data in clipboard for use in other applications.

3. Input file structure

The program input file must be written in ASCII or text format (be sure to select this option when saving the file with the editor of your choice). In the MS-Windows version of the program the GUI creates the input file after the user inputs the required data in the form provided. This is a sample input file:

File: test.pd

'Inputs from Philip(1993)' --> Description of data (40 char.)

0.030, 0.30 --> ri, ho (m), pipe dimensions

0.200 3600.0 10000.0 --> inc.theta_i, tmed_i, tmax_i(s) (i=1,n)

0.200 3420.0 10500.0

Where:

r_i (m)= internal radius of the pipe

h_o (m) = water depth in pipe at t=0

inc_theta_i = Dq, volumetric soil moisture increment in wetted area from the start to end of the experiment

tmed_i (s) = time for the water to reach a depth of Do/2

tmax_i (s) = and time when the depth of water is zero in the pipe

The user could edit the enclosed sample file, replace the contents with the values from the case to analyze, and change the name to new name reflecting the new application.

4. Program License

This program is distributed as FREEWARE/ PUBLIC DOMAIN under the terms of GNU-License. If the program is found useful the authors ask that acknowledgment is given to its use in any resulting publication and the authors notified. The source code is available from the authors upon request.

Dr. Rafael Munoz-Carpena Associate Professor, Hydrology & Water Quality Agricultural and Biological Engineering University of Florida 287 Frazier Rogers Hall, PO Box 110570 Gainesville, FL 32611-0570 tel: (352) 392-1864 x287; fax: (352) 392-4092 http://carpena.ifas.ufl.edu/ ; email: carpena@ufl.edu

Dr. Javier Alvarez- Benedí Researcher S.I.D.T.A., Valladolid Apdo 172 47080 Valladolid (Spain) Office: +34-983-414435 Fax. +34-983-414780 E-mail: javier@iq.cie.uva.es

References

De Haro, J.M., K. Vanderlinden, J.A. Gómez and J.V. Giráldez. 1998. Medida de la conductividad hidráulica saturada del suelo mediante el infiltrómetro de Philip-Dunne. In: A. González and E. Romero (eds.). Progresos en la Investigación en la Zona no Saturada. Ed. Universidad de Huelva. pp.129-147. 1998.

Gómez,J.A., J.V.Giráldez, and E.Fereres. 2001. Analysis of infiltration and runoff in an olive orchard under no-till. Soil Sci. Soc.Am. J. 65:291–299.

Philip, J.R. 1993. Approximate analysis of falling-head lined borehole permeameter. Water Resour. Res., 29(11):3763-3768.

Muñoz-Carpena. R., C.M. Regalado, J. Alvarez-Benedí, and F.Bartoli. 2002. Field comparison of the new Philip-Dunne permeameter vs. other methods for measuring saturated hydraulic conductivity. Soil Science, 167(1):9-24.

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