Dust Emission Study consultant is capable of independently performing difficult and complex work requiring thorough knowledge of the subject matter and significant experience within the designated company area or specific engineering discipline. Prepares correspondence and interfaces with state and federal regulatory agencies regarding technical or regulatory issues. Performs independent evaluations to determine validity of recorded emissions data. Designs, implements and operates cost effective monitoring programs ranging from small fence line studies to large complex air shed monitoring networks.
During the construction of new worksites and demolition of existing ones, air pollutants are generated that can have adverse off site impacts. These include particulate matter, motor vehicle emissions and odours. Dust is a major pollutant that can be generated from numerous construction activities. It is therefore important to understand the factors influencing its generation in order to reduce the potential environmental impacts associated with its dispersal.
A wide range of models and methodologies have been used to estimate the quantity of dust released during construction activities, as well as their emissions characteristics. These models are based on either in-situ observations or on laboratory experiments. However, these approaches are mainly empirical and do not take into account the importance of soil-atmosphere interactions. Furthermore, these methods are not able to accurately describe the entrainment mechanisms of particle lift.
The present research Dust Emission Study consultant aims to address this problem by developing a model that can predict the formation and transport of dust plumes, allowing for a more realistic assessment of the effects of these phenomena on ambient concentrations. To achieve this, a multi-scale approach is proposed that includes an analysis of the interaction between the soil and the atmosphere. Two major dust emission mechanisms are considered: saltation bombardment and aggregates disintegration. Both mechanisms are modeled as being influenced by a number of parameters that depend on the physical characteristics of the soil, including the water content and porosity.
In addition, the particle size distribution is taken into consideration. A new model for the dispersion of fine particles has been developed, taking into account the stochastic behavior of cohesive forces between the particles. The new model is able to accurately predict the concentration of particles at the source site, in both low and high wind conditions. The reliability of the model is demonstrated by comparing its predictions with in-situ measurements.
Finally, the model is compared with results obtained with other dispersion models such as FDM and ISCST3. The comparison shows that these models underestimate the lower concentrations and overestimate the high concentrations in the vicinity of the source. This indicates that further research is required before these models can be reliably applied to the prediction of ambient concentrations near fugitive dust sources.
Comments
Post a Comment