Note: The background image of the title is colored according to the atmospheric life time (before deposition on the surface) of individual particles of an ash cloud that consists of a large number of particles. It shows a filamentary, fractal structure characteristic to any chaotic system. The time between the life times of initially nearby particles may even reach several days or weeks. volcano advection image

EN RePLaT-Chaos HU

For the illustration of the chaotic behavior of the advection of volcanic ash clouds and other atmospheric pollutants

RePLaT-Chaos is an application for simulating the global-scale atmospheric spreading of pollutant clouds. The pollutant clouds consist of aerosol particles or gas particles. RePLaT-Chaos is also a suitable tool for studying the so-called chaotic features of the advection. The application is a simpler version of the previously developed RePLaT (Real Particle Lagrangian Trajectory) model.

In three-dimensional flows, as it is the case in the atmosphere, the advection of pollutants is chaotic. The advection dynamics of pollutants shows typical characteristics of the chaos, such as sensitivity to the initial conditions (the trajectories of initially nearby particles diverge within short time), irregular motion, and complex but regular (fractal) structures. It can be easily observed in the RePLaT-Chaos simulations that pollutant clouds do not disperse in the atmosphere like dye blobs on clothes, rather an initially compact pollutant cloud becomes soon strongly stretched, its length grows rapidly, while becoming filamentary, tortuous and folded. The application can also calculate two quantities which describe the chaoticity of the advection. The stretching rate (topological entropy) characterizes the rate of the exponential stretching of pollutant clouds, while the escape rate quantifies the deposition rate of particles falling out from the atmosphere to the surface.

In the full version each simulation parameter can be changed. The student version includes more animation and explanation for the observable phenomena.

RePLaT-Chaos full version
Author: Tímea Haszpra

Alternative 1: download installer

(for 64 bit Windows)

Files:

Launch the application:

  1. Download RePLaT-Chaos_installer.exe/RePLaT-Chaos-met_installer.exe to your computer (anywhere).
  2. Click the exe. It will install the application in the folder that you choose.
  3. If you have chosen to download the file without meteorological data, you can download met_data.zip later. (The location of the meteorological data should be given during setting up the simulation parameters.)
  4. Launch the application by clicking on RePLaT-Chaos.exe.

Alternative 2: download application

(for Windows and Linux if Java Runtime Environment 1.8 is available on your computer)

Files:

Launch the application:

  1. Download RePLaT-Chaos.zip to your computer (anywhere) and unpack it. Folder RePLaT-Chaos is created.
  2. Launch the application by typing

    java -jar RePLaT-Chaos.jar

    in Terminal/Command prompt from the folder RePLaT-Chaos.
    (Accessing Terminal: for Windows: type cmd in the search box of Start Menu and click the icon of the Command prompt; for Linux: open Terminal. You can reach the folder by typing cd <path to folder RePLaT-Chaos>.)

RePLaT-Chaos-edu for students
Author: Tímea Haszpra and Mária Kiss

Alternative 1: download installer

(for 64 bit Windows)

Files:

Launch the application:

  1. Download RePLaT-Chaos-edu_installer.exe to your computer (anywhere).
  2. Click the exe. It will install the application in the folder that you choose.
  3. Launch the application by clicking on RePLaT-Chaos-edu.exe.

Alternative 2: download application

(for Windows and Linux if Java Runtime Environment 1.8 is available on your computer)

Files:

Launch the application:

  1. Download RePLaT-Chaos-edu.zip to your computer (anywhere) and unpack it. Folder RePLaT-Chaos-edu is created.
  2. Launch the application by typing

    java -jar -Xmx1024m RePLaT-Chaos-edu.jar

    in Terminal/Command prompt from the folder RePLaT-Chaos-edu.
    (Accessing Terminal: for Windows: type cmd in the search box of Start Menu and click the icon of the Command prompt; for Linux: open Terminal. You can reach the folder by typing cd <path to folder RePLaT-Chaos-edu>.)

The projects are supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences, by the National Research, Development and Innovation Office (NKFIH) under Grants PD-121305, FK-124256 and by the MTA–ELTE Theoretical Physics Research Group. The student version is supported by the Pedagogy Research Program of the Hungarian Academy of Sciences.

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Web page is created by: Tímea Haszpra