faystal kerryanne hawleigh

0 views

Skip to first unread message

Slikk Huisenga

unread,

Aug 4, 2024, 3:13:25 AM8/4/24

to lianiculet

How to Download and Use Gradistat Version 8 for Particle Size Analysis

Gradistat is a software package that allows you to perform grain size distribution and statistics analysis for unconsolidated sediments. It was developed by Simon Blott and Kenneth Pye and published in the journal Earth Surface Processes and Landforms in 2001[^2^]. Gradistat can accept data from different measuring techniques, such as sieving and laser granulometry, and calculate various parameters, such as mean, mode, sorting, skewness, kurtosis, and percentiles. It can also generate graphical outputs, such as frequency and ternary plots.

Gradistat runs within Microsoft Excel and is compatible with versions 2000 to 2010. You can download Gradistat version 8 for free from the website of Kenneth Pye Associates Ltd[^1^], a consultancy firm that specializes in sedimentology and geomorphology. There are two versions available: one for Excel 2000-2003 (.xls) and one for Excel 2007-2010 (.xlsm). You will need to unzip the downloaded file and open it in Excel. The file contains a worksheet with instructions on how to use Gradistat, as well as examples of input and output data.

To use Gradistat, you will need to enter your particle size data in the appropriate columns of the input worksheet. You can use standard or non-standard size classes, as long as they are arranged in ascending order. You can also enter sample names, locations, and other information in the header rows. Gradistat will automatically calculate the statistics and display them in the output worksheet. You can also view the graphical outputs by clicking on the buttons at the top of the output worksheet. You can save, print, or copy the results as you wish.

Gradistat is a useful tool for sedimentologists, geologists, engineers, and anyone who needs to analyze particle size data. It is easy to use and provides reliable results. However, you should always check your data for errors and outliers before using Gradistat, and interpret the results with caution and in context of your research objectives. If you have any questions or feedback about Gradistat, you can contact the authors at simon...@kpal.co.uk or kenne...@kpal.co.uk.

Gradistat is based on the methods of moments and graphical methods for calculating particle size statistics. The moments method uses arithmetic and geometric means and standard deviations to derive the parameters, while the graphical method uses phi units and cumulative frequency curves to plot the data and measure the parameters. Gradistat allows you to compare the results from both methods and choose the most suitable one for your data. Gradistat also provides descriptive terms for the parameters based on the classification scheme of Folk and Ward (1957).

Gradistat can handle different types of particle size data, such as weight percentages, volume percentages, number percentages, or counts. It can also convert between different units, such as millimeters, micrometers, nanometers, or phi units. Gradistat can analyze up to 100 samples and 100 size classes per file. You can also combine multiple files into a single output file using the merge function. Gradistat can also perform basic statistical tests, such as t-test, ANOVA, and correlation analysis, on the output data.

Gradistat is not the only software available for particle size analysis. There are other programs that offer similar or more advanced features, such as GRADISTAT-PRO (a fully revised version of Gradistat that is currently under development), GRANPLOT (a program that produces ternary diagrams and other plots), PSALTS (a program that calculates saltation parameters), and SEDFIT (a program that models sediment transport and deposition). However, Gradistat is one of the most widely used and cited programs in the field of sedimentology and has been proven to be reliable and user-friendly.