StalGrowth

StalGrowth is a Open Source and Cross Platform program designed to calculate theoretical growth rates. It is based on physical parameters which influence carbonate precipitation rates (Cave air pCO2, Ca2+-ion-concentration, temperature, drip-rate and water-film thickness). This enables StalGrowth to untangle the complex interaction to identify and quantify seasonal growth rate changes and to deduce the empirical growth of a stalagmites given certain conditions from cave monitoring observations.

Features

• Import from CSV files
• Calculation of seasonal growth averages
• Auto sorting of the data into different seasons
  • Fast growth / Slow growth (user-specified season)
  • Winter / Summer ( Nominal Equinoxes)
• Graphic display of input parameters and results
• Interactive date and growth-rate reader
• Student's T-testing for significance of the season growth rates
• Identification of periods of no-growth or dissolution
• Estimation of seasonal growth bias

How to use:

1. Download using the download zip button on the right.
2. Open the StalGrowth.exe in the Windows Binary Folder.
3. Load your CSV via the load file button.
4. If it loaded correctly (see Input File section for more information) Press the Statistics or Graph Button on the bottom.

Equations:

Empirical Growth Equation:

R0 = 1174 = 1174*(cCa - appcCa) * (FilmThickness/DripInt) *(1.0 - e^exp)

Where exp:

 exp = (-1.0 * (alpha/FilmThickess) * DripInterval)

Where alpha:

 alpha= (0.52 + (0.04*Temp) + (0.004*Temp^2)) * 10^-7;

Apparent Calcium Concentration

appcCa = (5.872* pCO2^0.2526)+((-0.0167*Temp)+1.5146)) * 0.5;

Averaging, Variance, Standard Deviation use the standard formulas.

Input File

The input file of this program is a CSV file with a Header, in the following format:

Timestamp,Drip Interval (s),Error (s),Film Thickness (m),Error (m),Temperature (degC),Error (degC),pCO2 (atm),Error (atm),cCa (mol/m3),Error (mol/m3)
04/28/2005 00:00:00,4,1,0.0001,0.00005,18.27007299,0.2,0.000669456,0.00003,2.02345153,0.01

• Timestamp: Must be written: [MM/DD/YYYY 00:00:00] Specific time is a feature we plan on including

Sample Files are included in the src folder

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If anyone is interested in this proyect or would like to help, contact us!

####Credits:

• The AlgLib Commutiny @ http://www.alglib.net/
• The QT Community @ http://qt-project.org/
• Emanuel Eichhammer for QCustomPlot @ https://www.qcustomplot.com

Thanks, Rolf & Fran89.