Summary As a result of many years in-house research, the gas dispersion group at Shell Research Ltd. Thornton (United Kingdom) has developed a package of mathematical models, called HGSYSTEM, to study the atmospheric dispersion of accidental pollutant releases with emphasis on denser-than-air materials. HGSYSTEM can simulate different dispersion scenarios (jet dispersion, ... heavy gas dispersion, passive dispersion). HGSYSTEM can model the full HF chemistry and thermodynamics. Most of the modules in the HGSYSTEM package can also be used for more general, non-reactive (ideal gas) releases as well. Validation of the HF-related simulations has been done with the well-known Goldfish Test Series. HGSYSTEM is in wide use for simulation of atmospheric dispersion scanarios for HF and other pollutant releases. It has been assessed against other models and found to rank amongst the best available atmospheric dispersion models in the world. HGSYSTEM sets the standard for HF dispersion calculations. The following major changes have been made to HGSYSTEM 1.0 to obtain HGSYSTEM 3.0.: The thermodynamical models available in HGSYSTEM have been extended. The full HF chemistry and thermodynamical model is now suitable for mixtures of HF, water, and an inert ideal gas. The non-reactive ideal gas description has been extended to multi-compound liquid-vapor mixtures (aerosols). A database containing physical properties for some 30 compounds has been added to HGSTSTEM. This database is needed when using the new two-phase, multi-compound thermodynamical model; the PLUME model for pressurized releases has been extended to model jet dispersion of multi-compound, two-phase mixtures; A new model describing the initial phase of instantaneous releases has been added. A new model to calculate release rates from pressurized vessels is now available; The existing evaporating pool model EVAP has been replaced by a better model, LPOOL, for boiling and non-boiling pools and land and water; The formulation of the lateral spreading in the heavy gas dispersion model HEGADAS has been reviewed and improved; Several options have been added to the time-dependent version of the heavy gas model HEGADAS making it easier to use and to evaluate the results; and HGSYSTEM now contains three post-processors to generate data for graphical output after a pressurized jet release, steady state heavy gas release and a time-dependent heavy gas release respectively.
Use Constraints The datafile is on four 3 1/2 inch DOS diskettes, 1.44M high density. Documentation included; may be ordered separately as PB96-184023 and PB96-184031.
DOS operating system. Language: FORTRAN. 80386 processor or greater, MS-DOS 3.3, 4 MB RAM, 2.5 MB free disk space, and a math coprocessor recommended. Copyright Shell Internationale Research Maatschappij B.V. 1994.
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VIEW RELATED INFORMATION
Description:
A River Mechanics Forum has been established to provide a mechanism for FLDWAV
users (as well as users of other NWS River Mechanics models) to share knowledge
and experiences.
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VIEW PROJECT HOME PAGE
Description:
Some background information on the Simplified Dam Break (SMPDBK) Flood
Forecasting Model is available here.
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GET RELATED SERVICE METADATA (SERF)
Description:
FLDWAV is a generalized flood routing model (written in FORTRAN) which
performs
unsteady flow simulation. It replaces the National Weather Service DAMBRK and
DWOPER models because it combines their capabilities and provides additional
hydraulic simulation features.
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GET RELATED SERVICE METADATA (SERF)
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DAMBRK is a FORTRAN program which, when given the final breach bottom width
and
side slopes, computes the physical dimensions of a dam breach as it forms.
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GET RELATED SERVICE METADATA (SERF)
Description:
BREACH is a FORTRAN program which predicts breach characteristics (size,
shape, rate of formation) and the breach outflow hydrograph resulting from dam
failure. Failure may be initiated by water overtopping or piping through the
dam. Sudden collapse of sections of the breach may also be simulated.
Creation and Review Dates
SERF Creation Date:
2006-03-16
SERF Last Revision Date:
2007-05-31
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