An les-based microscale airborne hazard model

First responders need a more or less instant estimate of danger zones resulting from accidentally released hazardous materials in order to take immediate action, to coordinate rescue teams and to protect human population and critical infrastructure. To fulfil the need for a sufficient dispersion modelling accuracy while maintaining efficient access to reliable results in a first responders environment, systematic high resolution pre-accidental LES modelling can be combined with 'physical data reduction' in an emergency assessment tool. A typical example of such an approach adjusted to the geometry of the Hamburg inner city area will be presented.