A pivotal element for metropolitan planning and an essential component describing the urban design is block typology, affecting pollution concentration. Consequently, this research examines influence of various typologies on pollutant distribution. Four are simulated by ENVI-MET software. These cubic-shaped, L-shaped, C-shaped, linear-shaped models. Urban air quality was assessed using relative...

It is important to simulate a groundwater transport process, e.g., pollutant migration, through the vadose zone and subsequent mixing within the saturated zone to assess potential impacts of contaminants in the subsurface in preliminary stages. It is challenging to simulate heterogeneous soil characteristics and non-uniform initial contaminant concentration. This paper proposes a vertically het...

An Optical Flow technique based on the use of Dynamic Programming has been applied to Particle Image Velocimetry yielding a significant increase in the accuracy and spatial resolution of the velocity field. Results are presented for an interaction between a laminar boundary layer and a cavity. The experimental characterisation of the interaction between a boundary layer and a cavity was develop...

Initially, the paper provides an introduction to the main aspects of existing timedomain methods for identifying linear continuous-time models from discrete-time data and shows how one of these methods has been applied to the identification and estimation of a model for the transportation and dispersion of a pollutant in a river. It then introduces a widely applicable class of new, nonlinear, S...

1. General Modeling Methods 1.1. Pollutant Transport 1.2. Modeling Recommendations 2. Optimization 2.1. The Effect Function 2.2. The Objective Function 2.2.1. The Gradient of the Objective Function 2.3. Constraints 2.4. Algorithmic Considerations 3. Three Important Transport Modes 3.1. Advection and Convection 3.2. Diffusion 3.3. Dispersion 3.4. Combinations 3.4.1. Numerical Considerations 4. C...

[1] The assimilative capacities of estuaries and coastal seas for effluent discharges are predominantly determined by the rates at which pollutant‐bearing effluents are first dispersed and then flushed from the coastal region into the open ocean. The dispersion coefficients and flushing, as measured by the water residence time in the Persian Gulf (Arabian Gulf), were investigated using the thre...

The release of harmful contaminants is a potentially devastating threat to homeland security. Accurate identification of the source strength and location is essential to minimize the impact. Insufficient spatial and temporal resolution as well as inherent uncertainty in wind field data makes characterizing the source and predicting subsequent transport and dispersion extremely difficult. The so...

Despite their importance for pollutant dispersion in urban areas, the special features of dispersion at street intersections are rarely taken into account by operational air quality models. Several previous studies have demonstrated the complex flow patterns that occur at street intersections, even with simple geometry. This study presents results from wind tunnel experiments on a reduced scale...