Wakes concentration type

It is noted that there are two types of dispersion model at the discrete scale, both based on idealised calculations. One type considers how dispersion is affected by individual obstacles and their wakes, while the other concentrates more on dispersion defined by groups of obstacles along and above street canyons. Such models have the capability of being combined and extended. Future work should include the special problems of dispersion in particular building complexes and the use of real time data to assess and predict releases whose occurrence is not detected until consequences have become apparent. 

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