HYSPLIT Radiological (HYRad) Modeling Package

Development and Custodial Organization:
National Oceanic and Atmospheric Administration (NOAA)
Air Resources Laboratory (ARL)
Field Research Division (FRD)
1750 Foote Drive
Idaho Falls, ID  83402
Phone: (208) 526-2329
Fax: (208) 526-2549
Web: http://www.noaa.inel.gov/ 
HYRad Webpage:  http://www.noaa.inel.gov/hysplit/ 
(registration required)
Key Contacts: 
Kirk L. Clawson, Division Director & Research Meteorologist
Kirk.Clawson@noaa.gov; (208) 526-2742
Roger Carter
Roger.Carter@oaa.gov; (208) 526-2745
Dennis Finn
Dennis.Finn@noaa.gov; (208) 526-0566
Brad Reese
Brad.Reese@noaa.gov; (208) 526-5707
The HYSPLIT radiological (HYRad) modeling package was created to provide emergency response personnel and emergency planners at the Idaho National Laboratory (INL) with a set of software tools for rapidly evaluating the potential health and safety impacts of an airborne release involving radioactive material. HYRad uses a Lagrangian particle model to calculate individual nuclide air concentration, individual nuclide deposition, cumulative concentration or deposition, gross concentration, total exposure, eight radiological doses, and ingestion doses. The capabilities to perform model simulations from multiple sources, calculate dose rates, and provide for the display of plume animations are in development. The software is used for consequence assessment, hazard assessment, and safety analysis of facilities handling nuclear material. 
HYRad has been developed for use at the Department of Energy’s (DOE) INL facility. It was developed to replace the MDIFF puff diffusion model, first released in 1995 (Sagendorf 1995, 1996; Sagendorf and Carter 1999). MDIFF itself replaced MESODIF (MESOscale DIFfusion), another puff diffusion model first released in 1974 (Start and Wendell 1974). HYRad is built upon the foundation provided by the Air Resources Laboratory (ARL) HYSPLIT model. The initial version of HYSPLIT was created in 1979 by ARL headquarters staff and it has evolved continuously up through the present time. The HYSPLIT model has been widely used in a variety of plume dispersion and air quality modeling applications. HYSPLIT is most widely used as a web-based software application that runs on a Linux server.
Beginning in 2008, staff from the Field Research Division (FRD) of ARL acquired ARL’s developmental radiological package and added several new capabilities. During the same time period, FRD staff developed a new browser-based GUI running inside the Adobe Flash plugin that features dynamical interactivity in a Google Maps environment. The loss of Flash support by Google has recently spurred a shift to the utilization of alternatives to Google Maps for the display of plumes with a similar user experience. User requests are submitted from the browser to a web server and then configured into the appropriate control files and passed to a Linux server for HYSPLIT processing. FRD also extended the capability to access a mesonet database to utilize mesonet observations to drive plume dispersion. The capability to utilize mesonet observations for plume modeling has been used for INL Emergency Operation Center (EOC) applications since the inception of MESODIF in 1974. However, that capability has been upgraded and now includes the calculation of turbulence parameterization and mixing depth for ingest into the HYSPLIT model. It is possible that some components of HYRad will eventually be adopted into the main comprehensive ARL HYSPLIT software package.
The HYRad software project is a comprehensive effort that incorporates several primary components. These include:
     1.The utilization of a mesonet database to generate gridded 3-d meteorological fields.The utilization of a mesonet database to generate gridded 3-d meteorological fields
2. The utilization of weather forecast model-generated 3-d meteorological fields
4. Radiological dose calculations for emission sources having multiple nuclides
5. The plotting of radiological doses and the individual nuclide concentrations and depositions
6. Development of a new graphical user interface (GUI)
7. The scripts necessary for linking these components and executing the programs and other supporting software
8. Software Quality Assurance (SQA) documentation
A schematic outline (Figure 1) in the HYRad User’s Guide Vol. I, Operator Manual, outlines how HYRad processes a model run request and the interrelationships between the principal programs and files. There are three additional companion volumes to the User’s Guide that provide a comprehensive description of all facets of HYRad.
HYRad has been successfully tested on the following web browsers:
Internet Explorer version 7.0 and above
Firefox version 3.0 and above
Chrome version 7.0 and above
Minimum hardware requirements are a Pentium4 processor with 2 GB of memory and 512 MB RAM.
Software Quality Assurance Level:
  • Draxler R.R. and G.D. Hess (2004) Description of the HYSPLIT_4 Modeling System. NOAA Tech. Memo ERL ARL-224.
  • Draxler, R., B. Stunder, G. Rolph, A. Stein, and A. Taylor (2009) HYSPLIT4 User’s Guide, Version 4.9, January, 2009.
  • Sagendorf, J. F. (1995) Atmospheric Transport and Diffusion Modeling for the Test Reactor Area Facility. Technical Report ARLFRD 95-88(c).
  • Sagendorf, J. F. (1996) Atmospheric Transport and Diffusion Modeling for ICPP Short Term Releases. ARL Field Research Division Technical Report ARLFRD 96-88(g).
  • Sagendorf, J.F. and R.G. Carter (1999) MDIFF Transport and Diffusion Model, User’s Manual. ARLFRD 99-88(g), Air Resources Laboratory, Field Research Division, Idaho Falls, ID.
  • Start, G.E. and L.L. Wendell (1974) Regional effluent dispersion calculations considering spatial and temporal meteorological variations. NOAA Tech. Memo, ERL ARL-44, 63 pp.