UK-ADMS - A NEW APPROACH TO MODELING DISPERSION IN THE EARTHS ATMOSPHERIC BOUNDARY-LAYER

The UK atmospheric dispersion modelling system is a computer code for modelling the dispersion of buoyant or neutrally buoyant gaseous and p articulate emissions to the atmosphere. It comprises a number of indiv idual modules, each dealing with either one aspect of the dispersion p rocess or data input and output. Each module can be modified independe ntly to keep it, and hence the whole model, scientifically up-to-date. Emissions can be of any duration. The effects of plume rise, wet and dry deposition, radio-active decay, hilly.and variable roughness terra in, coastal regions and large buildings are allowed for. Fluctuations in concentration about the calculated mean are also modelled for time scales less than one hour. Output includes mean values, variances and percentiles of air concentration, dosage (time integrated concentratio n raised to some power), and deposition to the ground. For emissions o f radio-active isotopes estimates can be made of the ground level gamm a-radiation dose rate beneath the plume. A user interacts with the mod el via a system of menus based on Microsoft Windows so that it is easy to use.