Environmental and Pollution
SLAB VIEW 5.1

SLAB View is a graphical user interface for the SLAB model - an atmospheric dispersion model for denser-than-air releases. SLAB View is an ideal tool to predict hazardous zones and potential impacts of accidental releases.

 

SLAB View is able to show you how the release develops over time, as well as what the total footprint of the release will be.

SLAB View can model continuous, finite duration, and instantaneous releases from four types of sources:

  • a ground-level evaporating pool
  • an elevated horizontal jet
  • a stack or elevated vertical jet
  • and a ground-based instantaneous release

The SLAB model was developed in the 1980s by Lawrence Livermore National Laboratory (LLNL), with financial support from the Department of Energy (DOE). The SLAB model is currently distributed and supported by the US EPA.

SLAB View Main Features

Integrated Graphical User Interface

Integrated Graphical User Interface

Fully integrated interface combining easy to use graphical tools, seamless model run, and automated contouring and posting of results.

Multiple Release Types

Multiple Release Types

SLAB View models several different release types:

  • horizontal jet,
  • vertical jet,
  • evaporation pool and
  • instantaneous or short duration evaporation pool.

Plume Release in 3D

3D Visualization

Watch the plume disperse in three dimensions using the 3D View option.  Understanding how a release spreads has never been easier.

SLAB 3D allows you to create animations of plume migration that can be incorporated into most presentation packages.

Export to Google Earth™

Export to Google Earth™

This exciting feature allows you to export the footprint and or puff of the source spill into Google Earth giving you a more realistic image of where the spill will impact surrounding areas.

 

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Output Options

Graphical and Output Options

SLAB View provides you with full control of the appearance of your footprints and puffs. You can specify the footprint levels (ppm) to be displayed, which colors to use, line thickness, and much more.

Extensive Chemical Database

Extensive Chemical Database

SLAB View has an extensive database of chemicals that can be modeled, including their properties.  User defined chemicals can also be added.

Support for Several Base Map Formats

Support for Several Base Map Formats

SLAB View has support for a variety of image and base map formats allowing you to setup your model with confidence and easy visualization and identification of the location of your spill area. Supported base maps include: Bitmap, DLG, DXF, JPEG, LULC, MrSID, Shapefile, and TIFF/GeoTIFF.

Max Concentration Graph

Maximum Concentration Graphs

SLAB View automatically generates graphs displaying the Maximum Concentration Along the Centerline for all the meteorological conditions being modeled. You can specify the Level of Concern (LOC) for the chemical being modeled to be shown in the graph (indicated in this image as a red line).

SLAB Output Report

SLAB Output Report

SLAB View produces several easy ways for you to understand the SLAB output results. You can view the footprint, the puff over time, graphs of maximum concentration alog centerline, and a text report sumarizing the input and output data.

Technical Specifications

SLAB View is an interface for the SLAB model. See below the technical specifications for this model:

Parameter

Description

Model Name

SLAB - An Atmospheric Dispersion Model for Denser-Than-Air Releases

Model Guide

SLAB Model User's Guide

Developed By

Dr. Donald L. Ermak, Lawrence Livermore National Laboratory (LLNL)

Model Type

Steady-state Gaussian Plume model

Time Step

Seconds

Range

Near Field

Terrain

Not modeled

Building Downwash

Not modeled

Source Types

Evaporating pool, horizontal jet, vertical jet or stack, instantaneous or short duration evaporating pool 

Input Meteorology

User defined meteorological conditions

Wind Field

Homogeneous

Release Types

Denser than air plumes

Emission Types

Emergency release, continuous and transient emissions

Atmospheric Chemistry

Not modeled

Output

SLAB produces outputs of chemical concentrations at
various positions downwind and at specified heights above the ground

Regulatory Status

US EPA Alternative Model

System Requirements

This product is a Microsoft Windows-based program that can be installed in the following Windows operating systems:

  • 32-Bit and 64-Bit Operating Systems
  • Microsoft Windows 8
  • Microsoft Windows 7 (Home Premium, Professional and Ultimate Versions)
  • Microsoft Windows Vista (Business and Ultimate Versions)
  • Microsoft Windows XP Professional (Service Pack 3)

Minimum requirements:

  • An Intel Pentium 4 processor (or equivalent) or higher
  • At least 2 GB of available hard disk space
  • 1 GB of RAM (2 GB recommended)

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