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Authors: Folch, A.* 
Costa, A.* 
Hankin, R. K. S.* 
Title: twodee-2 : A Shallow Layer Model for Dense Gas Dispersion on Complex Topography
Issue Date: 28-Nov-2007
Keywords: Dense gas transport
Fortran code
Gas hazard
Computational model
Subject Classification05. General::05.08. Risk::05.08.01. Environmental risk 
Abstract: twodee-2 is a Fortran 90 code based on a previous code (twodee). It is de- 8 signed to solve the shallow water equations for fluid depth, depth-averaged horizon- 9 tal velocities and depth-averaged fluid density. The shallow layer approach used by 10 twodee-2 is a compromise between the complexity of CFD models and the simpler 11 integral models. It can be used for forecasting gas dispersion near the ground and/or 12 for hazard assessment over complex terrains. The inputs to the model are topog- 13 raphy, terrain roughness, wind measurements from meteorological stations and gas 14 flow rate from the ground sources. Optionally the model can be coupled with the 15 output of a meteorological processor which generates a zero-divergence wind field 16 incorporating terrain effects. Model outputs are gas concentration, depth-averaged 17 velocity, averaged cloud thickness and dose. The model can be a useful tool for gas 18 hazard assessment by evaluating where and when lethal concentrations for humans 19 and animals can be reached.
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