Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4539
Authors: Folch, A.* 
Costa, A.* 
Hankin, R. K. S.* 
Title: TWODEE-2: A shallow layer model for dense gas dispersion on complex topography
Journal: Computers & Geosciences 
Series/Report no.: 3/35 (2009)
Publisher: Elsevier
Issue Date: 2009
DOI: 10.1016/j.cageo.2007.12.017
Keywords: Dense gas transport
Fortran code
Gas hazard
Computational model
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
05. General::05.01. Computational geophysics::05.01.99. General or miscellaneous 
05. General::05.08. Risk::05.08.01. Environmental risk 
Abstract: TWODEE-2 is a FORTRAN 90 code based on previous code (TWODEE). It is designed to solve the shallow water equations for fluid depth, depth-averaged horizontal velocities and depth-averaged fluid density. The shallow layer approach used by TWODEE-2 is a compromise between the complexity of CFD models and the simpler integral models. It can be used for forecasting gas dispersion near the ground and/or for hazard assessment over complex terrains. The inputs to the model are topography, terrain roughness, wind measurements from meteorological stations and gas flow rate from the ground sources. Optionally the model can be coupled with the output of a meteorological processor which generates a zero-divergence wind field incorporating terrain effects. Model outputs are gas concentration, depth-averaged velocity, averaged cloud thickness and dose. The model can be a useful tool for gas hazard assessment by evaluating where and when lethal concentrations for humans and animals can be reached.
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